pglogical_ticker
Overview
| Package | Version | Category | License | Language |
|---|---|---|---|---|
pglogical_ticker | 1.4.1 | ETL | PostgreSQL | C |
| ID | Extension | Bin | Lib | Load | Create | Trust | Reloc | Schema |
|---|---|---|---|---|---|---|---|---|
| 9510 | pglogical_ticker | No | Yes | Yes | Yes | No | No | pglogical_ticker |
| Related | pglogical pglogical_origin pgl_ddl_deploy pg_failover_slots pgactive wal2json decoderbufs repmgr decoder_raw |
|---|
require a patch on el, pg18 break on el
Version
| Type | Repo | Version | PG Ver | Package | Deps |
|---|---|---|---|---|---|
| EXT | PGDG | 1.4.1 | 1817161514 | pglogical_ticker | pglogical |
| RPM | PIGSTY | 1.4.1 | 1817161514 | pglogical_ticker_$v | pglogical_$v |
| DEB | PGDG | 1.4.1 | 1817161514 | postgresql-$v-pglogical-ticker | postgresql-$v-pglogical |
Build
You can build the RPM / DEB packages for pglogical_ticker using pig build:
pig build pkg pglogical_ticker # build RPM / DEB packages
Install
You can install pglogical_ticker directly. First, make sure the PGDG repository is added and enabled:
pig repo add pgdg -u # Add PGDG repo and update cache
Install the extension using pig or apt/yum/dnf:
pig install pglogical_ticker; # Install for current active PG version
pig ext install -y pglogical_ticker -v 18 # PG 18
pig ext install -y pglogical_ticker -v 17 # PG 17
pig ext install -y pglogical_ticker -v 16 # PG 16
pig ext install -y pglogical_ticker -v 15 # PG 15
pig ext install -y pglogical_ticker -v 14 # PG 14
dnf install -y pglogical_ticker_18 # PG 18
dnf install -y pglogical_ticker_17 # PG 17
dnf install -y pglogical_ticker_16 # PG 16
dnf install -y pglogical_ticker_15 # PG 15
dnf install -y pglogical_ticker_14 # PG 14
apt install -y postgresql-18-pglogical-ticker # PG 18
apt install -y postgresql-17-pglogical-ticker # PG 17
apt install -y postgresql-16-pglogical-ticker # PG 16
apt install -y postgresql-15-pglogical-ticker # PG 15
apt install -y postgresql-14-pglogical-ticker # PG 14
Preload:
shared_preload_libraries = 'pglogical, pglogical_ticker';
Create Extension:
CREATE EXTENSION pglogical_ticker CASCADE; -- requires: pglogical
Usage
pglogical_ticker: Have an accurate view on pglogical replication delay
A background worker that periodically updates ticker tables to measure pglogical replication lag from the provider’s standpoint.
Enabling
Add to postgresql.conf:
shared_preload_libraries = 'pglogical,pglogical_ticker'
pglogical_ticker.database = 'mydb'
pglogical_ticker.naptime = 10 -- tick interval in seconds (default 10)
Install on both provider and all subscribers:
CREATE EXTENSION pglogical_ticker;
Deploy Ticker Tables
Run on the provider only (propagated to subscribers via pglogical):
-- Deploy ticker tables (one per replication set)
SELECT pglogical_ticker.deploy_ticker_tables();
-- Add ticker tables to replication
SELECT pglogical_ticker.add_ticker_tables_to_replication();
For cascading replication:
SELECT pglogical_ticker.deploy_ticker_tables('my_cascaded_set_name');
SELECT pglogical_ticker.add_ticker_tables_to_replication('my_cascaded_set_name');
Manual Tick
SELECT pglogical_ticker.tick();
Launching the Ticker
The ticker auto-launches on server start if configured in shared_preload_libraries. Otherwise:
SELECT pglogical_ticker.launch();
-- Or, only launch if replication set tables exist
SELECT pglogical_ticker.launch_if_repset_tables();
Viewing Replication Delay
On the provider:
SELECT * FROM pglogical_ticker.all_repset_tickers();
On a subscriber:
SELECT * FROM pglogical_ticker.all_subscription_tickers();
Configuration
pglogical_ticker.database- Database to run the ticker inpglogical_ticker.naptime- Tick interval in seconds (default 10)pglogical_ticker.restart_time- Seconds before auto-restart (default 10, -1 to disable)
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