pgsentinel
active session history
Repository
pgsentinel/pgsentinel
https://github.com/pgsentinel/pgsentinel
Source
pgsentinel-1.4.0.tar.gz
pgsentinel-1.4.0.tar.gz
Overview
| Package | Version | Category | License | Language |
|---|---|---|---|---|
pgsentinel | 1.4.0 | STAT | PostgreSQL | C |
| ID | Extension | Bin | Lib | Load | Create | Trust | Reloc | Schema |
|---|---|---|---|---|---|---|---|---|
| 6410 | pgsentinel | No | Yes | Yes | Yes | No | Yes | - |
| Related | system_stats pgnodemx pg_stat_monitor pg_wait_sampling bgw_replstatus pg_profile pg_proctab powa |
|---|
Version
| Type | Repo | Version | PG Ver | Package | Deps |
|---|---|---|---|---|---|
| EXT | MIXED | 1.4.0 | 1817161514 | pgsentinel | - |
| RPM | PIGSTY | 1.4.0 | 1817161514 | pgsentinel_$v | - |
| DEB | PGDG | 1.4.0 | 1817161514 | postgresql-$v-pgsentinel | - |
Build
You can build the RPM / DEB packages for pgsentinel using pig build:
pig build pkg pgsentinel # build RPM / DEB packages
Install
You can install pgsentinel directly. First, make sure the PGDG and PIGSTY repositories are added and enabled:
pig repo add pgsql -u # Add repo and update cache
Install the extension using pig or apt/yum/dnf:
pig install pgsentinel; # Install for current active PG version
pig ext install -y pgsentinel -v 18 # PG 18
pig ext install -y pgsentinel -v 17 # PG 17
pig ext install -y pgsentinel -v 16 # PG 16
pig ext install -y pgsentinel -v 15 # PG 15
pig ext install -y pgsentinel -v 14 # PG 14
dnf install -y pgsentinel_18 # PG 18
dnf install -y pgsentinel_17 # PG 17
dnf install -y pgsentinel_16 # PG 16
dnf install -y pgsentinel_15 # PG 15
dnf install -y pgsentinel_14 # PG 14
apt install -y postgresql-18-pgsentinel # PG 18
apt install -y postgresql-17-pgsentinel # PG 17
apt install -y postgresql-16-pgsentinel # PG 16
apt install -y postgresql-15-pgsentinel # PG 15
apt install -y postgresql-14-pgsentinel # PG 14
Preload:
shared_preload_libraries = 'pgsentinel';
Create Extension:
CREATE EXTENSION pgsentinel;
Usage
pgsentinel records active session history by sampling pg_stat_activity at regular intervals and linking activity with pg_stat_statements query statistics.
Active Session History
SELECT ash_time, datname, usename, pid, state,
wait_event_type, wait_event, query, queryid
FROM pg_active_session_history
ORDER BY ash_time DESC;
Key columns beyond pg_stat_activity:
| Column | Description |
|---|---|
ash_time | Sampling timestamp |
top_level_query | Top-level statement (for PL/pgSQL) |
query | Statement with actual parameter values |
cmdtype | Statement type: SELECT, UPDATE, INSERT, DELETE, UTILITY, UNKNOWN, NOTHING |
queryid | Links to pg_stat_statements |
blockers | Number of blocking processes |
blockerpid | PID of a blocking process |
blocker_state | State of the blocker |
Query Statistics History
When enabled, pgsentinel also samples pg_stat_statements concurrently:
SELECT ash_time, queryid, calls, total_exec_time, rows,
shared_blks_hit, shared_blks_read
FROM pg_stat_statements_history
ORDER BY ash_time DESC;
Example: Wait Analysis
-- Top wait events in the last hour
SELECT wait_event_type, wait_event, count(*)
FROM pg_active_session_history
WHERE ash_time > now() - interval '1 hour'
AND wait_event IS NOT NULL
GROUP BY 1, 2
ORDER BY 3 DESC;
-- Blocking analysis
SELECT blockerpid, blocker_state, count(*)
FROM pg_active_session_history
WHERE blockers > 0
GROUP BY 1, 2
ORDER BY 3 DESC;
Configuration
| Parameter | Default | Description |
|---|---|---|
pgsentinel_ash.sampling_period | 1 | Sampling period in seconds |
pgsentinel_ash.max_entries | 1000 | Ring buffer size for ASH |
pgsentinel.db_name | postgres | Database for worker connection |
pgsentinel_ash.track_idle_trans | false | Track idle-in-transaction sessions |
pgsentinel_pgssh.max_entries | 1000 | Ring buffer for pg_stat_statements history |
pgsentinel_pgssh.enable | false | Enable pg_stat_statements history |
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