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PG-182: Added a new option for the query buffer overflow.

pull/75/head
Ibrar Ahmed 2021-02-17 13:08:39 +00:00
parent 0c9c25fbd9
commit 6aa1b2e7b6
6 changed files with 61 additions and 43 deletions
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27
docs/USER_GUIDE.md
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@ -15,33 +15,6 @@ CREATE EXTENSION
Here is the complete list of configuration parameters.
```sql
postgres=# select * from pg_stat_monitor_settings;
name | value | default_value | description | minimum | maximum
| restart
------------------------------------------+-------+---------------+----------------------------------------------------------------------------------------------------------+---------+------------
+---------
pg_stat_monitor.pgsm_max | 100 | 100 | Sets the maximum size of shared memory in (MB) used for statement's metadata tracked by pg_stat_monitor. | 1 | 1000
| 1
pg_stat_monitor.pgsm_query_max_len | 1024 | 1024 | Sets the maximum length of query. | 1024 | 2147483647
| 1
pg_stat_monitor.pgsm_enable | 1 | 1 | Enable/Disable statistics collector. | 0 | 0
| 1
pg_stat_monitor.pgsm_track_utility | 1 | 0 | Selects whether utility commands are tracked. | 0 | 0
| 0
pg_stat_monitor.pgsm_normalized_query | 0 | 1 | Selects whether save query in normalized format. | 0 | 0
| 0
pg_stat_monitor.pgsm_max_buckets | 10 | 10 | Sets the maximum number of buckets. | 1 | 10
| 1
pg_stat_monitor.pgsm_bucket_time | 60 | 60 | Sets the time in seconds per bucket. | 1 | 2147483647
| 1
pg_stat_monitor.pgsm_histogram_min | 0 | 0 | Sets the time in millisecond. | 0 | 2147483647
| 1
pg_stat_monitor.pgsm_histogram_max | 10 | 10 | Sets the time in millisecond. | 10 | 2147483647
| 1
pg_stat_monitor.pgsm_histogram_buckets | 10 | 10 | Sets the maximum number of histogram buckets | 2 | 2147483647
| 1
pg_stat_monitor.pgsm_query_shared_buffer | 20 | 20 | Sets the maximum size of shared memory in (MB) used for query tracked by pg_stat_monitor. | 1 | 10000
| 1
(11 rows)
```
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``).

3
expected/guc.out
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@ -22,10 +22,11 @@ SELECT * FROM pg_stat_monitor_settings ORDER BY name COLLATE "C";
pg_stat_monitor.pgsm_max | 100 | 100 | Sets the maximum size of shared memory in (MB) used for statement's metadata tracked by pg_stat_monitor. | 1 | 1000 | 1
pg_stat_monitor.pgsm_max_buckets | 10 | 10 | Sets the maximum number of buckets. | 1 | 10 | 1
pg_stat_monitor.pgsm_normalized_query | 1 | 1 | Selects whether save query in normalized format. | 0 | 0 | 0
pg_stat_monitor.pgsm_overflow_target | 0 | 1 | Sets the overflow target for pg_stat_monitor | 0 | 1 | 1
pg_stat_monitor.pgsm_query_max_len | 1024 | 1024 | Sets the maximum length of query. | 1024 | 2147483647 | 1
pg_stat_monitor.pgsm_query_shared_buffer | 20 | 20 | Sets the maximum size of shared memory in (MB) used for query tracked by pg_stat_monitor. | 1 | 10000 | 1
pg_stat_monitor.pgsm_track_utility | 1 | 1 | Selects whether utility commands are tracked. | 0 | 0 | 0
(11 rows)
(12 rows)
SELECT pg_stat_monitor_reset();
pg_stat_monitor_reset

5
expected/guc_1.out
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@ -22,11 +22,12 @@ SELECT * FROM pg_stat_monitor_settings ORDER BY name COLLATE "C";
pg_stat_monitor.pgsm_max | 100 | 100 | Sets the maximum size of shared memory in (MB) used for statement's metadata tracked by pg_stat_monitor. | 1 | 1000 | 1
pg_stat_monitor.pgsm_max_buckets | 10 | 10 | Sets the maximum number of buckets. | 1 | 10 | 1
pg_stat_monitor.pgsm_normalized_query | 1 | 1 | Selects whether save query in normalized format. | 0 | 0 | 0
pg_stat_monitor.pgsm_overflow_target | 1 | 1 | Sets the overflow target for pg_stat_monitor | 0 | 1 | 1
pg_stat_monitor.pgsm_query_max_len | 1024 | 1024 | Sets the maximum length of query. | 1024 | 2147483647 | 1
pg_stat_monitor.pgsm_query_shared_buffer | 20 | 20 | Sets the maximum size of shared memory in (MB) used for query tracked by pg_stat_monitor. | 1 | 10000 | 1
pg_stat_monitor.pgsm_track_planning | 1 | 1 | Selects whether planning statistics are tracked. | 0 | 0 | 0
pg_stat_monitor.pgsm_track_planning | 0 | 1 | Selects whether planning statistics are tracked. | 0 | 0 | 0
pg_stat_monitor.pgsm_track_utility | 1 | 1 | Selects whether utility commands are tracked. | 0 | 0 | 0
(12 rows)
(13 rows)
SELECT pg_stat_monitor_reset();
pg_stat_monitor_reset

14
guc.c
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@ -18,7 +18,7 @@
#include "pg_stat_monitor.h"
GucVariable conf[13];
GucVariable conf[MAX_SETTINGS];
static void DefineIntGUC(GucVariable *conf);
static void DefineBoolGUC(GucVariable *conf);
@ -161,6 +161,18 @@ init_guc(void)
};
DefineIntGUC(&conf[i++]);
conf[i] = (GucVariable) {
.guc_name = "pg_stat_monitor.pgsm_overflow_target",
.guc_desc = "Sets the overflow target for pg_stat_monitor",
.guc_default = 1,
.guc_min = 0,
.guc_max = 1,
.guc_restart = true,
.guc_unit = 0,
.guc_value = &PGSM_OVERFLOW_TARGET
};
DefineIntGUC(&conf[i++]);
#if PG_VERSION_NUM >= 130000
conf[i] = (GucVariable) {
.guc_name = "pg_stat_monitor.pgsm_track_planning",

29
pg_stat_monitor.c
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@ -1178,10 +1178,20 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
int len = 0;
unsigned char *buf = pgss_qbuf[entry->key.bucket_id];
if(read_query(buf, queryid, query_txt) == 0)
{
switch(PGSM_OVERFLOW_TARGET)
{
case OVERFLOW_TARGET_NONE:
sprintf(query_txt, "%s", "query not found in query shared_buffer, no space left");
break;
case OVERFLOW_TARGET_DISK:
{
len = read_query_buffer(entry->key.bucket_id, queryid, query_txt);
if (len != MAX_QUERY_BUFFER_BUCKET)
sprintf(query_txt, "%s", "pg_stat_monitor: query not found either in hash nor in temporay file");
sprintf(query_txt, "%s", "query not found either in hash nor in temporay file");
}
break;
}
}
}
if (query_txt)
@ -2404,10 +2414,21 @@ store_query(int bucket_id, uint64 queryid, const char *query, uint64 query_len)
buf_len += sizeof (uint64);
if (QUERY_BUFFER_OVERFLOW(buf_len, query_len))
{
switch(PGSM_OVERFLOW_TARGET)
{
case OVERFLOW_TARGET_NONE:
return;
case OVERFLOW_TARGET_DISK:
{
dump_queries_buffer(bucket_id, buf, MAX_QUERY_BUFFER_BUCKET);
buf_len = sizeof (uint64);
}
break;
default:
break;
}
}
memcpy(&buf[buf_len], &queryid, sizeof (uint64)); /* query id */
buf_len += sizeof (uint64);
@ -2554,11 +2575,7 @@ pg_stat_monitor_settings(PG_FUNCTION_ARGS)
MemoryContextSwitchTo(oldcontext);
#if PG_VERSION_NUM >= 130000
for(i = 0; i < 12; i++)
#else
for(i = 0; i < 11; i++)
#endif
for(i = 0; i < MAX_SETTINGS; i++)
{
Datum values[7];
bool nulls[7];

14
pg_stat_monitor.h
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@ -92,6 +92,13 @@
#define QUERY_MARGIN 100
#define MIN_QUERY_LEN 10
#define SQLCODE_LEN 20
#if PG_VERSION_NUM >= 130000
#define MAX_SETTINGS 13
#else
#define MAX_SETTINGS 12
#endif
typedef struct GucVariables
{
int guc_variable;
@ -105,6 +112,12 @@ typedef struct GucVariables
bool guc_restart;
} GucVariable;
typedef enum OVERFLOW_TARGET
{
OVERFLOW_TARGET_NONE = 0,
OVERFLOW_TARGET_DISK
} OVERFLOW_TARGET;
typedef enum pgssStoreKind
{
PGSS_INVALID = -1,
@ -357,5 +370,6 @@ void pgss_startup(void);
#define PGSM_HISTOGRAM_BUCKETS get_conf(9)->guc_variable
#define PGSM_QUERY_SHARED_BUFFER get_conf(10)->guc_variable
#define PGSM_TRACK_PLANNING get_conf(11)->guc_variable
#define PGSM_OVERFLOW_TARGET get_conf(12)->guc_variable
#endif