Update USER_GUIDE.md
Ibrar Ahmed
GitHub
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637e864661
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@ -13,47 +13,47 @@ After doing that change, we need to restart the PostgreSQL server. PostgreSQL wi
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Here is the complete list of configuration parameters.
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```sql
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postgres=# select * from pg_stat_monitor_settings;
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name | value | default_value | description | minimum | maximum | restart
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name | value | default_value | description | minimum | maximum | restart
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-----------------------------------------------+--------+---------------+-------------------------------------------------------------------+---------+------------+---------
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pg_stat_monitor.pgsm_max | 5000 | 5000 | Sets the maximum number of statements tracked by pg_stat_monitor. | 5000 | 2147483647 | 1
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pg_stat_monitor.pgsm_query_max_len | 1024 | 1024 | Sets the maximum length of query. | 1024 | 2147483647 | 1
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pg_stat_monitor.pgsm_enable | 1 | 1 | Enable/Disable statistics collector. | 0 | 0 | 1
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pg_stat_monitor.pgsm_track_utility | 1 | 0 | Selects whether utility commands are tracked. | 0 | 0 | 0
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pg_stat_monitor.pgsm_normalized_query | 1 | 0 | Selects whether save query in normalized format. | 0 | 0 | 0
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pg_stat_monitor.pgsm_max_buckets | 10 | 10 | Sets the maximum number of buckets. | 1 | 10 | 1
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pg_stat_monitor.pgsm_bucket_time | 60 | 60 | Sets the time in seconds per bucket. | 1 | 2147483647 | 1
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pg_stat_monitor.pgsm_respose_time_lower_bound | 1 | 1 | Sets the time in millisecond. | 1 | 2147483647 | 1
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pg_stat_monitor.pgsm_respose_time_step | 1 | 1 | Sets the respose time steps in millisecond. | 1 | 2147483647 | 1
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pg_stat_monitor.pgsm_query_shared_buffer | 500000 | 500000 | Sets the query shared_buffer size. | 500000 | 2147483647 | 1
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pg_stat_monitor.pgsm_max | 5000 | 5000 | Sets the maximum number of statements tracked by pg_stat_monitor. | 5000 | 2147483647 | 1
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pg_stat_monitor.pgsm_query_max_len | 1024 | 1024 | Sets the maximum length of query. | 1024 | 2147483647 | 1
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pg_stat_monitor.pgsm_enable | 1 | 1 | Enable/Disable statistics collector. | 0 | 0 | 1
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pg_stat_monitor.pgsm_track_utility | 1 | 0 | Selects whether utility commands are tracked. | 0 | 0 | 0
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pg_stat_monitor.pgsm_normalized_query | 1 | 0 | Selects whether save query in normalized format. | 0 | 0 | 0
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pg_stat_monitor.pgsm_max_buckets | 10 | 10 | Sets the maximum number of buckets. | 1 | 10 | 1
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pg_stat_monitor.pgsm_bucket_time | 60 | 60 | Sets the time in seconds per bucket. | 1 | 2147483647 | 1
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pg_stat_monitor.pgsm_respose_time_lower_bound | 1 | 1 | Sets the time in millisecond. | 1 | 2147483647 | 1
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pg_stat_monitor.pgsm_respose_time_step | 1 | 1 | Sets the respose time steps in millisecond. | 1 | 2147483647 | 1
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pg_stat_monitor.pgsm_query_shared_buffer | 500000 | 500000 | Sets the query shared_buffer size. | 500000 | 2147483647 | 1
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(11 rows)
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```
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Some configuration parameters require the server restart and should be set before the server startup. These must be set in the ``postgresql.conf`` file. Other parameters do not require server restart and can be set permanently either in the ``postgresql.conf`` or from the client (``psql``).
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Some configuration parameters require the server restart and should be set before the server startup. These must be set in the ``postgresql.conf`` file. Other parameters do not require server restart and can be set permanently either in the ``postgresql.conf`` or from the client (``psql``).
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The table below shows set up options for each configuration parameter and whether the server restart is required to apply its value:
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| Parameter Name | postgresql.conf | SET | ALTER SYSTEM SET | server restart | configuration reload
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| Parameter Name | postgresql.conf | SET | ALTER SYSTEM SET | server restart | configuration reload
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| ----------------------------------------------|--------------------|-----|-------------------|-------------------|---------------------
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| pg_stat_monitor.pgsm_max | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :x:
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| pg_stat_monitor.pgsm_query_max_len | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :x:
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| pg_stat_monitor.pgsm_enable | :heavy_check_mark: | :x: |:heavy_check_mark: |:x: | :x:
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| pg_stat_monitor.pgsm_track_utility | :heavy_check_mark: | :heavy_check_mark: |:heavy_check_mark: |:x: | :heavy_check_mark:
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| pg_stat_monitor.pgsm_normalized_query | :heavy_check_mark: | :heavy_check_mark: |:heavy_check_mark: |:x: | :heavy_check_mark:
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| pg_stat_monitor.pgsm_max_buckets | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :heavy_check_mark:
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| pg_stat_monitor.pgsm_bucket_time | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :x:
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| pg_stat_monitor.pgsm_object_cache | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :x:
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| pg_stat_monitor.pgsm_respose_time_lower_bound | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :x:
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| pg_stat_monitor.pgsm_respose_time_step | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :x:
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| pg_stat_monitor.pgsm_query_shared_buffer | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :x:
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| pg_stat_monitor.pgsm_max | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :x:
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| pg_stat_monitor.pgsm_query_max_len | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :x:
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| pg_stat_monitor.pgsm_enable | :heavy_check_mark: | :x: |:heavy_check_mark: |:x: | :x:
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| pg_stat_monitor.pgsm_track_utility | :heavy_check_mark: | :heavy_check_mark: |:heavy_check_mark: |:x: | :heavy_check_mark:
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| pg_stat_monitor.pgsm_normalized_query | :heavy_check_mark: | :heavy_check_mark: |:heavy_check_mark: |:x: | :heavy_check_mark:
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| pg_stat_monitor.pgsm_max_buckets | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :heavy_check_mark:
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| pg_stat_monitor.pgsm_bucket_time | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :x:
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| pg_stat_monitor.pgsm_object_cache | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :x:
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| pg_stat_monitor.pgsm_respose_time_lower_bound | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :x:
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| pg_stat_monitor.pgsm_respose_time_step | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :x:
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| pg_stat_monitor.pgsm_query_shared_buffer | :heavy_check_mark: | :x: |:x: |:heavy_check_mark: | :x:
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#### Parameters description:
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- **pg_stat_monitor.pgsm_max**: This parameter defines the limit of shared memory for ``pg_stat_monitor``. This memory is used by buckets in a circular manner. The memory is divided between the buckets equally, at the start of the PostgreSQL.
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- **pg_stat_monitor.pgsm_query_max_len**: Sets the maximum size of the query. This parameter can only be set at the start of PostgreSQL. For long queries, the query is truncated to that particular length. This is to avoid unnecessary usage of shared memory.
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- **pg_stat_monitor.pgsm_enable**: This parameter enables or disables the monitoring. "Disable" means that ``pg_stat_monitor`` will not collect the statistics for the whole cluster.
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- **pg_stat_monitor.pgsm_track_utility**: This parameter controls whether utility commands are tracked by the module. Utility commands are all those other than ``SELECT``, ``INSERT``, ``UPDATE`` and ``DELETE``.
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- **pg_stat_monitor.pgsm_normalized_query**: By default, query shows the actual parameter instead of the placeholder. It is quite useful when users want to use that query and try to run that query to check the abnormalities. But in most cases users like the queries with a placeholder. This parameter is used to toggle between the two said options.
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- **pg_stat_monitor.pgsm_max_buckets**: ``pg_stat_monitor`` accumulates the information in the form of buckets. All the aggregated information is bucket based. This parameter is used to set the number of buckets the system can have. For example, if this parameter is set to 2, then the system will create two buckets. First, the system will add all the information into the first bucket. After its lifetime (defined in the pg_stat_monitor.pgsm_bucket_time parameter) expires, it will switch to the second bucket, reset all the counters and repeat the process.
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- **pg_stat_monitor.pgsm_track_utility**: This parameter controls whether utility commands are tracked by the module. Utility commands are all those other than ``SELECT``, ``INSERT``, ``UPDATE``, and ``DELETE``.
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- **pg_stat_monitor.pgsm_normalized_query**: By default, the query shows the actual parameter instead of the placeholder. It is quite useful when users want to use that query and try to run that query to check the abnormalities. But in most cases users like the queries with a placeholder. This parameter is used to toggle between the two said options.
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- **pg_stat_monitor.pgsm_max_buckets**: ``pg_stat_monitor`` accumulates the information in the form of buckets. All the aggregated information is bucket based. This parameter is used to set the number of buckets the system can have. For example, if this parameter is set to 2, then the system will create two buckets. First, the system will add all the information into the first bucket. After its lifetime (defined in the pg_stat_monitor.pgsm_bucket_time parameter) expires, it will switch to the second bucket, reset all the counters and repeat the process.
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- **pg_stat_monitor.pgsm_bucket_time**: This parameter is used to set the lifetime of the bucket. System switches between buckets on the basis of ``pg_stat_monitor.pgsm_bucket_time``.
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- **pg_stat_monitor.pgsm_respose_time_lower_bound**: ``pg_stat_monitor`` also stores the execution time histogram. This parameter is used to set the lower bound of the histogram.
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- **pg_stat_monitor.pgsm_respose_time_step:** This parameter is used to set the steps for the histogram.
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@ -63,49 +63,49 @@ The table below shows set up options for each configuration parameter and whethe
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pg_stat_monitor extension contains a view called pg_stat_monitor, which contains all the monitoring information. Following is the list of columns in pg_stat_monitor.
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| Column | Type | pg_stat_monitor | pg_stat_statments
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| Column | Type | pg_stat_monitor | pg_stat_statments
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|--------------------|--------------------------|----------------------|------------------
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bucket | integer | :heavy_check_mark: | :x:
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bucket_start_time | timestamp with time zone | :heavy_check_mark: | :x:
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userid | oid | :heavy_check_mark: | :heavy_check_mark:
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dbid | oid | :heavy_check_mark: | :heavy_check_mark:
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client_ip | inet | :heavy_check_mark: | :x:
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queryid | text | :heavy_check_mark: | :heavy_check_mark:
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query | text | :heavy_check_mark: | :heavy_check_mark:
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application_name | text | :heavy_check_mark: | :x:
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relations | text[] | :heavy_check_mark: | :x:
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cmd_type | text[] | :heavy_check_mark: | :x:
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elevel | integer | :heavy_check_mark: | :x:
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sqlcode | integer | :heavy_check_mark: | :x:
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message | text | :heavy_check_mark: | :x:
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plans | bigint | :heavy_check_mark: | :heavy_check_mark:
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plan_total_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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plan_min_timei | double precision | :heavy_check_mark: | :heavy_check_mark:
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plan_max_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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plan_mean_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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plan_stddev_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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calls | bigint | :heavy_check_mark: | :heavy_check_mark:
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total_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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min_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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max_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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mean_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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stddev_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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rows | bigint | :heavy_check_mark: | :heavy_check_mark:
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shared_blks_hit | bigint | :heavy_check_mark: | :heavy_check_mark:
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shared_blks_read | bigint | :heavy_check_mark: | :heavy_check_mark:
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shared_blks_dirtied | bigint | :heavy_check_mark: | :heavy_check_mark:
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shared_blks_written | bigint | :heavy_check_mark: | :heavy_check_mark:
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local_blks_hit | bigint | :heavy_check_mark: | :heavy_check_mark:
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local_blks_read | bigint | :heavy_check_mark: | :heavy_check_mark:
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local_blks_dirtied | bigint | :heavy_check_mark: | :heavy_check_mark:
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local_blks_written | bigint | :heavy_check_mark: | :heavy_check_mark:
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temp_blks_read | bigint | :heavy_check_mark: | :heavy_check_mark:
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temp_blks_written | bigint | :heavy_check_mark: | :heavy_check_mark:
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blk_read_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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blk_write_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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resp_calls | text[] | :heavy_check_mark: | :x:
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cpu_user_time | double precision | :heavy_check_mark: | :x:
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cpu_sys_time | double precision | :heavy_check_mark: | :x:
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bucket | integer | :heavy_check_mark: | :x:
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bucket_start_time | timestamp with time zone | :heavy_check_mark: | :x:
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userid | oid | :heavy_check_mark: | :heavy_check_mark:
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dbid | oid | :heavy_check_mark: | :heavy_check_mark:
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client_ip | inet | :heavy_check_mark: | :x:
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queryid | text | :heavy_check_mark: | :heavy_check_mark:
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query | text | :heavy_check_mark: | :heavy_check_mark:
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application_name | text | :heavy_check_mark: | :x:
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relations | text[] | :heavy_check_mark: | :x:
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cmd_type | text[] | :heavy_check_mark: | :x:
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elevel | integer | :heavy_check_mark: | :x:
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sqlcode | integer | :heavy_check_mark: | :x:
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message | text | :heavy_check_mark: | :x:
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plans | bigint | :heavy_check_mark: | :heavy_check_mark:
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plan_total_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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plan_min_timei | double precision | :heavy_check_mark: | :heavy_check_mark:
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plan_max_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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plan_mean_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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plan_stddev_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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calls | bigint | :heavy_check_mark: | :heavy_check_mark:
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total_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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min_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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max_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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mean_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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stddev_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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rows | bigint | :heavy_check_mark: | :heavy_check_mark:
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shared_blks_hit | bigint | :heavy_check_mark: | :heavy_check_mark:
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shared_blks_read | bigint | :heavy_check_mark: | :heavy_check_mark:
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shared_blks_dirtied | bigint | :heavy_check_mark: | :heavy_check_mark:
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shared_blks_written | bigint | :heavy_check_mark: | :heavy_check_mark:
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local_blks_hit | bigint | :heavy_check_mark: | :heavy_check_mark:
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local_blks_read | bigint | :heavy_check_mark: | :heavy_check_mark:
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local_blks_dirtied | bigint | :heavy_check_mark: | :heavy_check_mark:
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local_blks_written | bigint | :heavy_check_mark: | :heavy_check_mark:
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temp_blks_read | bigint | :heavy_check_mark: | :heavy_check_mark:
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temp_blks_written | bigint | :heavy_check_mark: | :heavy_check_mark:
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blk_read_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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blk_write_time | double precision | :heavy_check_mark: | :heavy_check_mark:
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resp_calls | text[] | :heavy_check_mark: | :x:
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cpu_user_time | double precision | :heavy_check_mark: | :x:
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cpu_sys_time | double precision | :heavy_check_mark: | :x:
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Here are some key features of pg_stat_monitor.
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@ -118,76 +118,76 @@ pg_stat_monitor collects and aggregates data on a bucket basis. The size of a bu
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```sql
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postgres=# select bucket, bucket_start_time, query from pg_stat_monitor;
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bucket | bucket_start_time | query
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bucket | bucket_start_time | query
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--------+-------------------------------+--------------------------------------------------------
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2 | 2020-05-23 13:24:44.652415+00 | select * from pg_stat_monitor_reset()
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3 | 2020-05-23 13:45:01.55658+00 | select bucket, bucket_start_time, query from pg_stat_monitor
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3 | 2020-05-23 13:45:01.55658+00 | select bucket, bucket_start_time, query from pg_stat_monitor
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2 | 2020-05-23 13:24:44.652415+00 | SELECT * FROM foo
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(3 rows)
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```
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#### Query Information
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**`userid`**: An ID of the user whom that query belongs. pg_stat_monitor is used to collect queries from all the users; therefore, `userid` is used to segregate the queries based on different users.
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**`userid`**: An ID of the user to whom that query belongs. pg_stat_monitor is used to collect queries from all the users; therefore, `userid` is used to segregate the queries based on different users.
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**`dbid`**: The database ID of the query. pg_stat_monitor accumulates queries from all the databases; therefore, this column is used to identify the database.
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**`queryid`**: pg_stat_monitor generates a unique ID for each query (queryid).
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**`queryid`**: pg_stat_monitor generates a unique ID for each query (queryid).
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**`query`**: The query column contains the actual text of the query. This parameter depends on the **`pg_stat_monitor.pgsm_normalized_query`** configuration parameters, in which format to show the query.
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**`calls`**: Number of calls of that particular query.
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##### Example 1: Shows the userid, dbid, unique queryid hash, query and total number of calls or that query.
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##### Example 1: Shows the userid, dbid, unique queryid hash, query, and the total number of calls or that query.
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```sql
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postgres=# select userid, dbid, queryid, substr(query,0, 50) as query, calls from pg_stat_monitor;
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userid | dbid | queryid | query | calls
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postgres=# select userid, dbid, queryid, substr(query,0, 50) as query, calls from pg_stat_monitor;
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userid | dbid | queryid | query | calls
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--------+-------+------------------+---------------------------------------------------+-------
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10 | 12709 | 214646CE6F9B1A85 | BEGIN | 1577
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10 | 12709 | 8867FEEB8A5388AC | vacuum pgbench_branches | 1
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10 | 12709 | F47D95C9DF863E43 | UPDATE pgbench_branches SET bbalance = bbalance + | 1577
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10 | 12709 | 2FE0A6ABDC20623 | select substr(query,$1, $2) as query, cmd_type fr | 7
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10 | 12709 | A83503D3E1F99139 | select userid, dbid, queryid, substr(query,$1, $ | 1
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10 | 12709 | D4B1243AC3268B9B | select count(*) from pgbench_branches | 1
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10 | 12709 | 2FE0A6ABDC20623 | select substr(query,$1, $2) as query, cmd_type fr | 1
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10 | 12709 | 1D9BDBBCFB89F096 | UPDATE pgbench_accounts SET abalance = abalance + | 1577
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10 | 12709 | 15343084284782B | update test SET a = $1 | 2
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10 | 12709 | 939C2F56E1F6A174 | END | 1577
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1 | 12709 | DAE6D269D27F2EC4 | SELECT FOR UPDATE test SET a = 1; | 1
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10 | 12709 | 2B50C2406BFAC907 | INSERT INTO pgbench_history (tid, bid, aid, delta | 1577
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10 | 12709 | F6DA9838660825CA | vacuum pgbench_tellers | 1
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10 | 12709 | 3AFB8B2452721F9 | SELECT a from test for update | 1
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10 | 12709 | A5CD0AF80D28363 | SELECT abalance FROM pgbench_accounts WHERE aid = | 1577
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10 | 12709 | E445DD36B9189C53 | UPDATE pgbench_tellers SET tbalance = tbalance + | 1577
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10 | 12709 | 4876BBA9A8FCFCF9 | truncate pgbench_history | 1
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10 | 12709 | D3C2299FD9E7348C | select userid, dbid, queryid, query, calls from | 1
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10 | 12709 | 214646CE6F9B1A85 | BEGIN | 1577
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10 | 12709 | 8867FEEB8A5388AC | vacuum pgbench_branches | 1
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10 | 12709 | F47D95C9DF863E43 | UPDATE pgbench_branches SET bbalance = bbalance + | 1577
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10 | 12709 | 2FE0A6ABDC20623 | select substr(query,$1, $2) as query, cmd_type fr | 7
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10 | 12709 | A83503D3E1F99139 | select userid, dbid, queryid, substr(query,$1, $ | 1
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10 | 12709 | D4B1243AC3268B9B | select count(*) from pgbench_branches | 1
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10 | 12709 | 2FE0A6ABDC20623 | select substr(query,$1, $2) as query, cmd_type fr | 1
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10 | 12709 | 1D9BDBBCFB89F096 | UPDATE pgbench_accounts SET abalance = abalance + | 1577
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10 | 12709 | 15343084284782B | update test SET a = $1 | 2
|
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10 | 12709 | 939C2F56E1F6A174 | END | 1577
|
||||
1 | 12709 | DAE6D269D27F2EC4 | SELECT FOR UPDATE test SET a = 1; | 1
|
||||
10 | 12709 | 2B50C2406BFAC907 | INSERT INTO pgbench_history (tid, bid, aid, delta | 1577
|
||||
10 | 12709 | F6DA9838660825CA | vacuum pgbench_tellers | 1
|
||||
10 | 12709 | 3AFB8B2452721F9 | SELECT a from test for update | 1
|
||||
10 | 12709 | A5CD0AF80D28363 | SELECT abalance FROM pgbench_accounts WHERE aid = | 1577
|
||||
10 | 12709 | E445DD36B9189C53 | UPDATE pgbench_tellers SET tbalance = tbalance + | 1577
|
||||
10 | 12709 | 4876BBA9A8FCFCF9 | truncate pgbench_history | 1
|
||||
10 | 12709 | D3C2299FD9E7348C | select userid, dbid, queryid, query, calls from | 1
|
||||
(18 rows)
|
||||
```
|
||||
|
||||
##### Example 2: Shows the different username for the queries.
|
||||
##### Example 2: Shows the different usernames for the query.
|
||||
|
||||
```
|
||||
postgres=# select userid::regrole, datname, substr(query,0, 50) as query, calls from pg_stat_monitor, pg_database WHERE dbid = oid;
|
||||
userid | datname | query | calls
|
||||
userid | datname | query | calls
|
||||
----------+----------+---------------------------------------------------+-------
|
||||
vagrant | postgres | select userid::regrole, datname, substr(query,$1, | 1
|
||||
vagrant | test_db | insert into bar values($1) | 1
|
||||
vagrant | postgres | insert into bar values($1) | 1
|
||||
vagrant | test_db | select * from bar | 1
|
||||
postgres | postgres | insert into bar values($1) | 1
|
||||
vagrant | postgres | select userid::regrole, datname, substr(query,$1, | 1
|
||||
vagrant | test_db | insert into bar values($1) | 1
|
||||
vagrant | postgres | insert into bar values($1) | 1
|
||||
vagrant | test_db | select * from bar | 1
|
||||
postgres | postgres | insert into bar values($1) | 1
|
||||
(5 rows)
|
||||
```
|
||||
|
||||
##### Example 3: Shows the differen database involved in the queries.
|
||||
##### Example 3: Shows the different database involved in the queries.
|
||||
|
||||
```
|
||||
postgres=# select userid::regrole, datname, substr(query,0, 50) as query, calls from pg_stat_monitor, pg_database WHERE dbid = oid;
|
||||
userid | datname | query | calls
|
||||
userid | datname | query | calls
|
||||
---------+----------+---------------------------------------------------+-------
|
||||
vagrant | postgres | select userid::regrole, datname, substr(query,$1, | 0
|
||||
vagrant | test_db | insert into bar values($1) | 1
|
||||
vagrant | test_db | select * from bar | 1
|
||||
vagrant | postgres | select userid::regrole, datname, substr(query,$1, | 0
|
||||
vagrant | test_db | insert into bar values($1) | 1
|
||||
vagrant | test_db | select * from bar | 1
|
||||
(3 rows)
|
||||
```
|
||||
|
||||
|
|
@ -195,55 +195,55 @@ postgres=# select userid::regrole, datname, substr(query,0, 50) as query, calls
|
|||
|
||||
```sql
|
||||
postgres=# select application_name, query from pg_stat_monitor;
|
||||
application_name | query
|
||||
application_name | query
|
||||
------------------+------------------------------------------------------------------------------------------------------
|
||||
pgbench | UPDATE pgbench_branches SET bbalance = bbalance + $1 WHERE bid = $2
|
||||
pgbench | UPDATE pgbench_accounts SET abalance = abalance + $1 WHERE aid = $2
|
||||
pgbench | vacuum pgbench_tellers
|
||||
pgbench | SELECT abalance FROM pgbench_accounts WHERE aid = $1
|
||||
pgbench | END
|
||||
pgbench | select count(*) from pgbench_branches
|
||||
pgbench | BEGIN
|
||||
pgbench | INSERT INTO pgbench_history (tid, bid, aid, delta, mtime) VALUES ($1, $2, $3, $4, CURRENT_TIMESTAMP)
|
||||
psql | select application_name, query from pg_stat_monitor
|
||||
pgbench | vacuum pgbench_branches
|
||||
psql | select application_name query from pg_stat_monitor
|
||||
pgbench | truncate pgbench_history
|
||||
pgbench | UPDATE pgbench_tellers SET tbalance = tbalance + $1 WHERE tid = $2
|
||||
pgbench | UPDATE pgbench_branches SET bbalance = bbalance + $1 WHERE bid = $2
|
||||
pgbench | UPDATE pgbench_accounts SET abalance = abalance + $1 WHERE aid = $2
|
||||
pgbench | vacuum pgbench_tellers
|
||||
pgbench | SELECT abalance FROM pgbench_accounts WHERE aid = $1
|
||||
pgbench | END
|
||||
pgbench | select count(*) from pgbench_branches
|
||||
pgbench | BEGIN
|
||||
pgbench | INSERT INTO pgbench_history (tid, bid, aid, delta, mtime) VALUES ($1, $2, $3, $4, CURRENT_TIMESTAMP)
|
||||
psql | select application_name, query from pg_stat_monitor
|
||||
pgbench | vacuum pgbench_branches
|
||||
psql | select application_name query from pg_stat_monitor
|
||||
pgbench | truncate pgbench_history
|
||||
pgbench | UPDATE pgbench_tellers SET tbalance = tbalance + $1 WHERE tid = $2
|
||||
(13 rows)
|
||||
```
|
||||
|
||||
#### Error Messages / Error Codes and Error Level
|
||||
|
||||
**`elevel`**, **`sqlcode`**,**`message`**,: error level / sql code and log/warning/error message
|
||||
**`elevel`**, **`sqlcode`**,**`message`**,: error level / sql code and log/warning/error message
|
||||
|
||||
```sql
|
||||
postgres=# select substr(query,0,50) as query, decode_error_level(elevel)as elevel,sqlcode,calls, substr(message,0,50) message from pg_stat_monitor;
|
||||
query | elevel | sqlcode | calls | message
|
||||
query | elevel | sqlcode | calls | message
|
||||
---------------------------------------------------+--------+---------+-------+---------------------------------------------------
|
||||
select substr(query,$1,$2) as query, decode_error | | 0 | 1 |
|
||||
select bucket,substr(query,$1,$2),decode_error_le | | 0 | 3 |
|
||||
| LOG | 0 | 1 | database system is ready to accept connections
|
||||
select 1/0; | ERROR | 130 | 1 | division by zero
|
||||
| LOG | 0 | 1 | database system was shut down at 2020-11-11 11:37
|
||||
select $1/$2 | | 0 | 1 |
|
||||
select substr(query,$1,$2) as query, decode_error | | 0 | 1 |
|
||||
select bucket,substr(query,$1,$2),decode_error_le | | 0 | 3 |
|
||||
| LOG | 0 | 1 | database system is ready to accept connections
|
||||
select 1/0; | ERROR | 130 | 1 | division by zero
|
||||
| LOG | 0 | 1 | database system was shut down at 2020-11-11 11:37
|
||||
select $1/$2 | | 0 | 1 |
|
||||
(6 rows)
|
||||
```
|
||||
|
||||
#### Query Timing Information
|
||||
|
||||
**`total_time`**, **`min_time`**, **`max_time`**, **`mean_time`**: The total / minimum / maximum and mean time spent for the same query.
|
||||
**`total_time`**, **`min_time`**, **`max_time`**, **`mean_time`**: The total / minimum / maximum and mean time spent for the same query.
|
||||
|
||||
|
||||
```
|
||||
postgres=# select userid, total_time, min_time, max_time, mean_time, query from pg_stat_monitor;
|
||||
userid | total_time | min_time | max_time | mean_time | query
|
||||
postgres=# select userid, total_time, min_time, max_time, mean_time, query from pg_stat_monitor;
|
||||
userid | total_time | min_time | max_time | mean_time | query
|
||||
--------+--------------------+--------------------+--------------------+--------------------+------------------------------------------------------------------
|
||||
10 | 0.14 | 0.14 | 0.14 | 0.14 | select * from pg_stat_monitor_reset()
|
||||
10 | 0.19 | 0.19 | 0.19 | 0.19 | select userid, dbid, queryid, query from pg_stat_monitor
|
||||
10 | 0.30 | 0.13 | 0.16 | 0.15 | select bucket, bucket_start_time, query from pg_stat_monitor
|
||||
10 | 0.29 | 0.29 | 0.29 | 0.29 | select userid, dbid, queryid, query, calls from pg_stat_monitor
|
||||
10 | 11277.79 | 11277.79 | 11277.79 | 11277.79 | SELECT * FROM foo
|
||||
10 | 0.14 | 0.14 | 0.14 | 0.14 | select * from pg_stat_monitor_reset()
|
||||
10 | 0.19 | 0.19 | 0.19 | 0.19 | select userid, dbid, queryid, query from pg_stat_monitor
|
||||
10 | 0.30 | 0.13 | 0.16 | 0.15 | select bucket, bucket_start_time, query from pg_stat_monitor
|
||||
10 | 0.29 | 0.29 | 0.29 | 0.29 | select userid, dbid, queryid, query, calls from pg_stat_monitor
|
||||
10 | 11277.79 | 11277.79 | 11277.79 | 11277.79 | SELECT * FROM foo
|
||||
```
|
||||
|
||||
#### Client IP address
|
||||
|
|
@ -252,21 +252,21 @@ postgres=# select userid, total_time, min_time, max_time, mean_time, query from
|
|||
|
||||
```sql
|
||||
postgres=# select userid::regrole, datname, substr(query,0, 50) as query, calls,client_ip from pg_stat_monitor, pg_database WHERE dbid = oid;
|
||||
userid | datname | query | calls | client_ip
|
||||
userid | datname | query | calls | client_ip
|
||||
---------+----------+---------------------------------------------------+-------+-----------
|
||||
vagrant | postgres | UPDATE pgbench_branches SET bbalance = bbalance + | 1599 | 10.0.2.15
|
||||
vagrant | postgres | select userid::regrole, datname, substr(query,$1, | 5 | 10.0.2.15
|
||||
vagrant | postgres | UPDATE pgbench_accounts SET abalance = abalance + | 1599 | 10.0.2.15
|
||||
vagrant | postgres | select userid::regrole, datname, substr(query,$1, | 1 | 127.0.0.1
|
||||
vagrant | postgres | vacuum pgbench_tellers | 1 | 10.0.2.15
|
||||
vagrant | postgres | SELECT abalance FROM pgbench_accounts WHERE aid = | 1599 | 10.0.2.15
|
||||
vagrant | postgres | END | 1599 | 10.0.2.15
|
||||
vagrant | postgres | select count(*) from pgbench_branches | 1 | 10.0.2.15
|
||||
vagrant | postgres | BEGIN | 1599 | 10.0.2.15
|
||||
vagrant | postgres | INSERT INTO pgbench_history (tid, bid, aid, delta | 1599 | 10.0.2.15
|
||||
vagrant | postgres | vacuum pgbench_branches | 1 | 10.0.2.15
|
||||
vagrant | postgres | truncate pgbench_history | 1 | 10.0.2.15
|
||||
vagrant | postgres | UPDATE pgbench_tellers SET tbalance = tbalance + | 1599 | 10.0.2.15
|
||||
vagrant | postgres | UPDATE pgbench_branches SET bbalance = bbalance + | 1599 | 10.0.2.15
|
||||
vagrant | postgres | select userid::regrole, datname, substr(query,$1, | 5 | 10.0.2.15
|
||||
vagrant | postgres | UPDATE pgbench_accounts SET abalance = abalance + | 1599 | 10.0.2.15
|
||||
vagrant | postgres | select userid::regrole, datname, substr(query,$1, | 1 | 127.0.0.1
|
||||
vagrant | postgres | vacuum pgbench_tellers | 1 | 10.0.2.15
|
||||
vagrant | postgres | SELECT abalance FROM pgbench_accounts WHERE aid = | 1599 | 10.0.2.15
|
||||
vagrant | postgres | END | 1599 | 10.0.2.15
|
||||
vagrant | postgres | select count(*) from pgbench_branches | 1 | 10.0.2.15
|
||||
vagrant | postgres | BEGIN | 1599 | 10.0.2.15
|
||||
vagrant | postgres | INSERT INTO pgbench_history (tid, bid, aid, delta | 1599 | 10.0.2.15
|
||||
vagrant | postgres | vacuum pgbench_branches | 1 | 10.0.2.15
|
||||
vagrant | postgres | truncate pgbench_history | 1 | 10.0.2.15
|
||||
vagrant | postgres | UPDATE pgbench_tellers SET tbalance = tbalance + | 1599 | 10.0.2.15
|
||||
```
|
||||
|
||||
#### Call Timings Histogram
|
||||
|
|
@ -275,7 +275,7 @@ postgres=# select userid::regrole, datname, substr(query,0, 50) as query, calls,
|
|||
|
||||
```sql
|
||||
postgres=# select resp_calls, query from pg_stat_monitor;
|
||||
resp_calls | query
|
||||
resp_calls | query
|
||||
--------------------------------------------------+----------------------------------------------
|
||||
{1," 0"," 0"," 0"," 0"," 0"," 0"," 0"," 0"," 0"} | select client_ip, query from pg_stat_monitor
|
||||
{3," 0"," 0"," 0"," 0"," 0"," 0"," 0"," 0"," 1"} | select * from pg_stat_monitor_reset()
|
||||
|
|
@ -292,39 +292,39 @@ There are 10 timebase buckets of the time **`pg_stat_monitor.pgsm_respose_time_s
|
|||
##### Example 1: List all the table names involved in the query.
|
||||
```sql
|
||||
postgres=# select relations::oid[]::regclass[], query from pg_stat_monitor;
|
||||
relations | query
|
||||
relations | query
|
||||
--------------------+------------------------------------------------------------------------------------------------------
|
||||
{pgbench_accounts} | UPDATE pgbench_accounts SET abalance = abalance + $1 WHERE aid = $2
|
||||
{pgbench_accounts} | SELECT abalance FROM pgbench_accounts WHERE aid = $1
|
||||
{pg_stat_monitor} | select relations::oid[]::regclass[], cmd_type,resp_calls,query from pg_stat_monitor
|
||||
{pgbench_branches} | select count(*) from pgbench_branches
|
||||
{pgbench_history} | INSERT INTO pgbench_history (tid, bid, aid, delta, mtime) VALUES ($1, $2, $3, $4, CURRENT_TIMESTAMP)
|
||||
{foo,bar} | select * from foo,bar
|
||||
{pgbench_accounts} | UPDATE pgbench_accounts SET abalance = abalance + $1 WHERE aid = $2
|
||||
{pgbench_accounts} | SELECT abalance FROM pgbench_accounts WHERE aid = $1
|
||||
{pg_stat_monitor} | select relations::oid[]::regclass[], cmd_type,resp_calls,query from pg_stat_monitor
|
||||
{pgbench_branches} | select count(*) from pgbench_branches
|
||||
{pgbench_history} | INSERT INTO pgbench_history (tid, bid, aid, delta, mtime) VALUES ($1, $2, $3, $4, CURRENT_TIMESTAMP)
|
||||
{foo,bar} | select * from foo,bar
|
||||
(5 rows)
|
||||
```
|
||||
|
||||
##### Example 2: List all the views and the name of table in the view. Here we have a view "test_view"
|
||||
##### Example 2: List all the views and the name of the table in the view. Here we have a view "test_view"
|
||||
```sql
|
||||
postgres=# \d+ test_view
|
||||
View "public.test_view"
|
||||
Column | Type | Collation | Nullable | Default | Storage | Description
|
||||
View "public.test_view"
|
||||
Column | Type | Collation | Nullable | Default | Storage | Description
|
||||
--------+---------+-----------+----------+---------+---------+-------------
|
||||
foo_a | integer | | | | plain |
|
||||
bar_a | integer | | | | plain |
|
||||
foo_a | integer | | | | plain |
|
||||
bar_a | integer | | | | plain |
|
||||
View definition:
|
||||
SELECT f.a AS foo_a,
|
||||
b.a AS bar_a
|
||||
FROM foo f,
|
||||
bar b;
|
||||
SELECT f.a AS foo_a,
|
||||
b.a AS bar_a
|
||||
FROM foo f,
|
||||
bar b;
|
||||
```
|
||||
|
||||
Now when we query the pg_stat_monitor, it will shows the view name and also all the table names in the view.
|
||||
Now when we query the pg_stat_monitor, it will show the view name and also all the table names in the view.
|
||||
```sql
|
||||
postgres=# select relations::oid[]::regclass[], query from pg_stat_monitor;
|
||||
relations | query
|
||||
relations | query
|
||||
---------------------+------------------------------------------------------------------------------------------------------
|
||||
{test_view,foo,bar} | select * from test_view
|
||||
{foo,bar} | select * from foo,bar
|
||||
{test_view,foo,bar} | select * from test_view
|
||||
{foo,bar} | select * from foo,bar
|
||||
(2 rows)
|
||||
```
|
||||
|
||||
|
|
@ -334,22 +334,22 @@ postgres=# select relations::oid[]::regclass[], query from pg_stat_monitor;
|
|||
|
||||
```sql
|
||||
postgres=# select substr(query,0, 50) as query, cmd_type from pg_stat_monitor where elevel = 0;
|
||||
query | cmd_type
|
||||
query | cmd_type
|
||||
---------------------------------------------------+-----------------
|
||||
BEGIN | {INSERT}
|
||||
vacuum pgbench_branches | {}
|
||||
UPDATE pgbench_branches SET bbalance = bbalance + | {UPDATE,SELECT}
|
||||
select substr(query,$1, $2) as query, cmd_type fr | {SELECT}
|
||||
select count(*) from pgbench_branches | {SELECT}
|
||||
select substr(query,$1, $2) as query, cmd_type fr | {}
|
||||
UPDATE pgbench_accounts SET abalance = abalance + | {UPDATE,SELECT}
|
||||
update test SET a = $1 | {UPDATE}
|
||||
END | {INSERT}
|
||||
INSERT INTO pgbench_history (tid, bid, aid, delta | {INSERT}
|
||||
vacuum pgbench_tellers | {}
|
||||
SELECT a from test for update | {UPDATE,SELECT}
|
||||
SELECT abalance FROM pgbench_accounts WHERE aid = | {SELECT}
|
||||
UPDATE pgbench_tellers SET tbalance = tbalance + | {UPDATE,SELECT}
|
||||
truncate pgbench_history | {}
|
||||
BEGIN | {INSERT}
|
||||
vacuum pgbench_branches | {}
|
||||
UPDATE pgbench_branches SET bbalance = bbalance + | {UPDATE,SELECT}
|
||||
select substr(query,$1, $2) as query, cmd_type fr | {SELECT}
|
||||
select count(*) from pgbench_branches | {SELECT}
|
||||
select substr(query,$1, $2) as query, cmd_type fr | {}
|
||||
UPDATE pgbench_accounts SET abalance = abalance + | {UPDATE,SELECT}
|
||||
update test SET a = $1 | {UPDATE}
|
||||
END | {INSERT}
|
||||
INSERT INTO pgbench_history (tid, bid, aid, delta | {INSERT}
|
||||
vacuum pgbench_tellers | {}
|
||||
SELECT a from test for update | {UPDATE,SELECT}
|
||||
SELECT abalance FROM pgbench_accounts WHERE aid = | {SELECT}
|
||||
UPDATE pgbench_tellers SET tbalance = tbalance + | {UPDATE,SELECT}
|
||||
truncate pgbench_history | {}
|
||||
(15 rows)
|
||||
```
|
||||
|
|
|
|||
Loading…
Reference in New Issue