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PG-607: Allow histogram to track queries in sub-ms time brackets (#384)

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* PG-607: Allow histogram to track queries in sub-ms time brackets

Updated the GUC configuration and the relevant histogram functionality
to track queries in lower cardinality than ms. This is done by saving
the GUC values for histogram min and max values in real (double) type.

All test cases except for the 030 tap test are passing. The test case
needs an update.

* Fixing regression issues for v12 and below because of histogram changes.
This commit is contained in:
Muhammad Usama
2023-02-23 21:24:40 +05:00
committed by GitHub
parent 05ffcac2fa
commit fe23d31bf9
10 changed files with 74 additions and 73 deletions
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12
t/expected/001_settings_default.out
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@@ -8,14 +8,14 @@ SELECT pg_stat_monitor_reset();
SELECT name, setting, unit, context, vartype, source, min_val, max_val, enumvals, boot_val, reset_val, pending_restart FROM pg_settings WHERE name LIKE '%pg_stat_monitor%';
name | setting | unit | context | vartype | source | min_val | max_val | enumvals | boot_val | reset_val | pending_restart
-------------------------------------------+---------+------+------------+---------+---------+---------+------------+----------------+----------+-----------+-----------------
pg_stat_monitor.pgsm_bucket_time | 60 | | postmaster | integer | default | 1 | 2147483647 | | 60 | 60 | f
pg_stat_monitor.pgsm_bucket_time | 60 | s | postmaster | integer | default | 1 | 2147483647 | | 60 | 60 | f
pg_stat_monitor.pgsm_enable_overflow | on | | postmaster | bool | default | | | | on | on | f
pg_stat_monitor.pgsm_enable_pgsm_query_id | on | | user | bool | default | | | | on | on | f
pg_stat_monitor.pgsm_enable_query_plan | off | | user | bool | default | | | | off | off | f
pg_stat_monitor.pgsm_extract_comments | off | | user | bool | default | | | | off | off | f
pg_stat_monitor.pgsm_histogram_buckets | 20 | | postmaster | integer | default | 2 | 50 | | 20 | 20 | f
pg_stat_monitor.pgsm_histogram_max | 100000 | | postmaster | integer | default | 10 | 2147483647 | | 100000 | 100000 | f
pg_stat_monitor.pgsm_histogram_min | 1 | | postmaster | integer | default | 0 | 2147483647 | | 1 | 1 | f
pg_stat_monitor.pgsm_histogram_max | 100000 | ms | postmaster | real | default | 10 | 5e+07 | | 100000 | 100000 | f
pg_stat_monitor.pgsm_histogram_min | 1 | ms | postmaster | real | default | 0 | 5e+07 | | 1 | 1 | f
pg_stat_monitor.pgsm_max | 256 | MB | postmaster | integer | default | 10 | 10240 | | 256 | 256 | f
pg_stat_monitor.pgsm_max_buckets | 10 | | postmaster | integer | default | 1 | 20000 | | 10 | 10 | f
pg_stat_monitor.pgsm_normalized_query | off | | user | bool | default | | | | off | off | f
@@ -37,14 +37,14 @@ SELECT datname, substr(query,0,100) AS query, calls FROM pg_stat_monitor ORDER B
SELECT name, setting, unit, context, vartype, source, min_val, max_val, enumvals, boot_val, reset_val, pending_restart FROM pg_settings WHERE name LIKE '%pg_stat_monitor%';
name | setting | unit | context | vartype | source | min_val | max_val | enumvals | boot_val | reset_val | pending_restart
-------------------------------------------+---------+------+------------+---------+---------+---------+------------+----------------+----------+-----------+-----------------
pg_stat_monitor.pgsm_bucket_time | 60 | | postmaster | integer | default | 1 | 2147483647 | | 60 | 60 | f
pg_stat_monitor.pgsm_bucket_time | 60 | s | postmaster | integer | default | 1 | 2147483647 | | 60 | 60 | f
pg_stat_monitor.pgsm_enable_overflow | on | | postmaster | bool | default | | | | on | on | f
pg_stat_monitor.pgsm_enable_pgsm_query_id | on | | user | bool | default | | | | on | on | f
pg_stat_monitor.pgsm_enable_query_plan | off | | user | bool | default | | | | off | off | f
pg_stat_monitor.pgsm_extract_comments | off | | user | bool | default | | | | off | off | f
pg_stat_monitor.pgsm_histogram_buckets | 20 | | postmaster | integer | default | 2 | 50 | | 20 | 20 | f
pg_stat_monitor.pgsm_histogram_max | 100000 | | postmaster | integer | default | 10 | 2147483647 | | 100000 | 100000 | f
pg_stat_monitor.pgsm_histogram_min | 1 | | postmaster | integer | default | 0 | 2147483647 | | 1 | 1 | f
pg_stat_monitor.pgsm_histogram_max | 100000 | ms | postmaster | real | default | 10 | 5e+07 | | 100000 | 100000 | f
pg_stat_monitor.pgsm_histogram_min | 1 | ms | postmaster | real | default | 0 | 5e+07 | | 1 | 1 | f
pg_stat_monitor.pgsm_max | 256 | MB | postmaster | integer | default | 10 | 10240 | | 256 | 256 | f
pg_stat_monitor.pgsm_max_buckets | 10 | | postmaster | integer | default | 1 | 20000 | | 10 | 10 | f
pg_stat_monitor.pgsm_normalized_query | off | | user | bool | default | | | | off | off | f