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PostgreSQL TimescaleDB Settings

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PostgreSQL TimescaleDB settings affect the availability and performance of a database cluster. When creating a cluster, default values are set in the configuration. The default values are chosen to ensure high cluster performance and vary depending on the cluster configuration and the version of PostgreSQL TimescaleDB.

You can:

  • view the default setting values and change them when creating a cluster;
  • or view settings and change them in an already created cluster.

We recommend changing setting values only when necessary—incorrect values can make the cluster inoperable or reduce its performance.

When scaling a cluster, the values of some settings are automatically replaced with defaults. A list of such settings can be found in the Automatic settings change during cluster scaling subsection.

View settings

You can view the list of settings available for changes when creating a cluster or changing settings.

If you have changed the settings, you can separately view a list of settings whose values differ from the default values.

A detailed description of all settings can be found in the Server Configuration section of the PostgreSQL documentation.

  1. In the Dashboard, on the top menu, click Products and select Managed Databases.
  2. Open the Active tab.
  3. Open the cluster page → Settings tab.
  4. In the DBMS Settings block, click Change.
  5. Optional: to view only those settings for which you have changed the default value, select the Show changed parameters checkbox.
  6. View settings.

Change settings

carefully

We recommend changing setting values only when necessary—incorrect values can make the cluster inoperable or reduce its performance.

After changing certain settings, the cluster will automatically reboot and will be unavailable while it is rebooting. The reboot will start immediately after saving the changes. A list of such settings can be found in the List of settings that require a reboot subsection.

  1. In the Dashboard, on the top menu, click Products and select Managed Databases.
  2. Open the Active tab.
  3. Open the cluster page → Settings tab.
  4. In the DBMS Settings block, click Change.
  5. Specify new values.
  6. Click Save.

List of settings that require a restart

  • autovacuum_freeze_max_age;
  • autovacuum_max_workers;
  • autovacuum_multixact_freeze_max_age;
  • huge_pages;
  • max_connections;
  • max_files_per_process;
  • max_locks_per_transaction;
  • max_logical_replication_workers;
  • max_pred_locks_per_transaction;
  • max_prepared_transactions;
  • max_wal_senders;
  • max_worker_processes;
  • old_snapshot_threshold;
  • pg_stat_statements.max;
  • shared_buffers;
  • timescaledb.max_background_workers;
  • track_activity_query_size.

Automatic settings adjustment during cluster scaling

DBMS settings have valid ranges. If, during cluster scaling, setting values go beyond the valid ranges, they are automatically replaced with default values so that the cluster can function.

Once the cluster is scaled and enters the ACTIVE status, you can change the settings and set new values.

List of settings whose values are reverted to default when scaling the cluster:

  • autovacuum_max_workers;
  • effective_cache_size;
  • maintenance_work_mem;
  • max_parallel_workers;
  • max_wal_size;
  • max_worker_processes;
  • shared_buffers;
  • vacuum_cost_limit;
  • work_mem.

Configuring huge_pages

In Managed Databases, PostgreSQL TimescaleDB you can enable and disable Huge Pages using the huge_pages setting.

Huge Pages is a memory management technology that allows using larger memory pages than standard ones. The size of standard memory pages is 4 KB. After enabling the huge_pages setting, 2 MB memory pages become available. Huge Pages can be used, for example, for shared memory (shared buffers). Thanks to this technology, you can reduce the overhead on computational resources: vCPU and RAM.

The huge_pages setting is available for PostgreSQL TimescaleDB version 15 and higher.

Possible values are on and off. The default value is off. If you change this setting, the cluster will automatically restart and will be unavailable during the restart. The restart will begin immediately after you save your changes.

If the huge_pages setting is enabled, but shared memory limits do not allow the use of Huge Pages, the cluster will enter an ERROR status.In this case, we recommend reducing the value of the shared_buffers.