Utilizzi i flag di database per molte operazioni, tra cui la modifica dei parametri PostgreSQL, la modifica delle opzioni e la configurazione e l'ottimizzazione delle istanze.
Le altre colonne della tabella contengono informazioni aggiuntive
su ogni flag di AlloyDB Omni:pG_
Fai clic sul nome di un flag per visualizzarne le istruzioni per l'uso.
La colonna Valore predefinito mostra il valore che
AlloyDB Omni imposta per questo flag in una nuova istanza, a meno che tu non specifichi un valore diverso durante la creazione dell'istanza.
Predefinito standard indica che il flag ha un valore predefinito non
impostato da AlloyDB Omni. Per saperne di più, fai clic sul nome del paese.
Nella colonna Riavvio richiesto, Sì indica che
devi riavviare AlloyDB Omni quando imposti, rimuovi o
modifica il flag sull'istanza. Il valore del flag persiste per l'istanza finché non lo modifichi di nuovo.
Nella colonna Restrizioni di replica, Sì indica le seguenti
limitazioni relative all'utilizzo del flag:
Prima di impostare questo flag sull'istanza principale del cluster, imposta
il flag su ciascuna delle istanze di replica del cluster.
Se l'istanza principale ha questo flag impostato, il valore di questo
flag su qualsiasi istanza di replica deve essere uguale o maggiore
del valore dell'istanza principale per questo flag.
Flag PostgreSQL standard che richiedono il riavvio
I seguenti flag PostgreSQL standard richiedono il riavvio di AlloyDB Omni quando imposti, rimuovi o modifichi il flag sull'istanza. Il valore del flag persiste per l'istanza finché non lo modifichi di nuovo.
[[["Facile da capire","easyToUnderstand","thumb-up"],["Il problema è stato risolto","solvedMyProblem","thumb-up"],["Altra","otherUp","thumb-up"]],[["Difficile da capire","hardToUnderstand","thumb-down"],["Informazioni o codice di esempio errati","incorrectInformationOrSampleCode","thumb-down"],["Mancano le informazioni o gli esempi di cui ho bisogno","missingTheInformationSamplesINeed","thumb-down"],["Problema di traduzione","translationIssue","thumb-down"],["Altra","otherDown","thumb-down"]],["Ultimo aggiornamento 2025-09-03 UTC."],[[["\u003cp\u003eThis page provides a comprehensive list of database flags supported by AlloyDB Omni, which can be used to manage various aspects of instance configuration and tuning.\u003c/p\u003e\n"],["\u003cp\u003eDatabase flags are used to configure and tune AlloyDB Omni instances, and may require instance restarts when modified, as indicated in the "Restart required" column.\u003c/p\u003e\n"],["\u003cp\u003eEach database flag has a default value, which is applied upon the creation of a new instance unless specified otherwise, and "Standard default" means that the default value is not set by AlloyDB Omni.\u003c/p\u003e\n"],["\u003cp\u003eSome database flags have replica restrictions, meaning they need to be set on replica instances before the primary, and replica values must be equal to or greater than the primary's value.\u003c/p\u003e\n"],["\u003cp\u003eThe provided table includes the database flag name, default value, restart requirement and replica restriction information, and each flag name is a link to more information.\u003c/p\u003e\n"]]],[],null,["# Supported database flags\n\nSelect a documentation version: 16.3.0keyboard_arrow_down\n\n- [Current (16.8.0)](/alloydb/omni/current/docs/reference/database-flags)\n- [16.8.0](/alloydb/omni/16.8.0/docs/reference/database-flags)\n- [16.3.0](/alloydb/omni/16.3.0/docs/reference/database-flags)\n- [15.12.0](/alloydb/omni/15.12.0/docs/reference/database-flags)\n- [15.7.1](/alloydb/omni/15.7.1/docs/reference/database-flags)\n- [15.7.0](/alloydb/omni/15.7.0/docs/reference/database-flags)\n\n\u003cbr /\u003e\n\nAlloyDB Omni supports all database flags provided by standard [PostgreSQL](https://www.postgresql.org/docs/16/index.html) versions. This page lists the database flags that AlloyDB Omni provides in addition to the standard database flags.\n\n\u003cbr /\u003e\n\nYou use database flags for many operations, including adjusting PostgreSQL\nparameters, adjusting options, and configuring and tuning instances.\n\nFor more information about setting database flags in\nAlloyDB Omni, see [Configure AlloyDB Omni database flags](/alloydb/omni/16.3.0/docs/configure-database-flags).\n\nAlloyDB Omni flags\n------------------\n\nThe table's other columns contain additional information\nabout each AlloyDB Omni flag:pG_\n\n- Click a flag name to see its usage instructions.\n\n- The **Default value** column displays the value that\n AlloyDB Omni sets for this flag in a new instance, unless you specify a different value when creating the instance.\n\n **Standard default** indicates that the flag has a default value that's not\n set by AlloyDB Omni. To learn more, click the flag's name.\n- In the **Restart required** column, **Yes** indicates that\n you need to restart AlloyDB Omni when you set, remove, or\n modify the flag on the instance. The flag's value persists for the\n instance until you modify it again.\n\n- In the **Replica restrictions** column, **Yes** indicates the following\n restrictions on how you can use the flag:\n\n - Before setting this flag on your cluster's primary instance, set\n the flag on each of your cluster's replica instances.\n\n - If the primary instance has this flag set, then the value of this\n flag on any replica instance must be equal to or greater\n than the primary instance's value for this flag.\n\n \u003cbr /\u003e\n\n[A](#postgres-a) \\| [C](#postgres-c) \\| [D](#postgres-d) \\| [E](#postgres-e) \\| [F](#postgres-f) \\| [G](#postgres-g) \\| [H](#postgres-h) \\| [I](#postgres-i) \\| [J](#postgres-j) \\| [L](#postgres-l) \\| [M](#postgres-m) \\| [O](#postgres-o) \\| [P](#postgres-p) \\| [R](#postgres-r) \\| [S](#postgres-s) \\| [T](#postgres-t) \\| [V](#postgres-v) \\| [W](#postgres-w)\n\nStandard PostgreSQL flags that need restart\n-------------------------------------------\n\nThe following standard PostgreSQL flags require a restart of AlloyDB Omni when you set, remove, or modify the flag on the instance. The flag's value persists for the instance until you modify it again.\n\n- [autovacuum_freeze_max_age](https://www.postgresql.org/docs/16/runtime-config-autovacuum.html#GUC-AUTOVACUUM-FREEZE-MAX-AGE)\n- [autovacuum_max_workers](https://www.postgresql.org/docs/16/runtime-config-autovacuum.html#GUC-AUTOVACUUM-MAX-WORKERS)\n- [autovacuum_multixact_freeze_max_age](https://www.postgresql.org/docs/16/runtime-config-autovacuum.html#GUC-AUTOVACUUM-MULTIXACT-FREEZE-MAX-AGE)\n- [cron.database_name](https://github.com/citusdata/pg_cron#what-is-pg_cron)\n- [cron.log_run](https://github.com/citusdata/pg_cron/blob/main/src/pg_cron.c)\n- [cron.log_statement](https://github.com/citusdata/pg_cron/blob/main/src/pg_cron.c)\n- [cron.max_running_jobs](https://github.com/citusdata/pg_cron/blob/main/src/pg_cron.c)\n- [max_connections](https://www.postgresql.org/docs/16/runtime-config-connection.html#GUC-MAX-CONNECTIONS)\n- [max_locks_per_transaction](https://www.postgresql.org/docs/16/runtime-config-locks.html#GUC-MAX-LOCKS-PER-TRANSACTION)\n- [max_logical_replication_workers](https://www.postgresql.org/docs/16/runtime-config-replication.html#GUC-MAX-LOGICAL-REPLICATION-WORKERS)\n- [max_pred_locks_per_page](https://www.postgresql.org/docs/16/runtime-config-locks.html#GUC-MAX-PRED-LOCKS-PER-PAGE)\n- [max_pred_locks_per_relation](https://www.postgresql.org/docs/16/runtime-config-locks.html#GUC-MAX-PRED-LOCKS-PER-RELATION)\n- [max_pred_locks_per_transaction](https://www.postgresql.org/docs/16/runtime-config-locks.html#GUC-MAX-PRED-LOCKS-PER-TRANSACTION)\n- [max_prepared_transactions](https://www.postgresql.org/docs/16/runtime-config-resource.html#GUC-MAX-PREPARED-TRANSACTIONS)\n- [max_replication_slots](https://www.postgresql.org/docs/16/runtime-config-replication.html#GUC-MAX-REPLICATION-SLOTS)\n- [max_wal_senders](https://www.postgresql.org/docs/16/runtime-config-replication.html#GUC-MAX-WAL-SENDERS)\n- [max_worker_processes](https://www.postgresql.org/docs/16/runtime-config-resource.html#GUC-MAX-WORKER-PROCESSES)\n- [old_snapshot_threshold](https://www.postgresql.org/docs/16/runtime-config-resource.html#GUC-OLD-SNAPSHOT-THRESHOLD)\n- [pg_stat_statements.max](https://www.postgresql.org/docs/16/pgstatstatements.html#id-1.11.7.38.8)\n- [pglogical.batch_inserts](https://github.com/2ndQuadrant/pglogical#configuration-options)\n- [pglogical.synchronous_commit](https://github.com/2ndQuadrant/pglogical#synchronous-replication)\n- [pglogical.use_spi](https://github.com/2ndQuadrant/pglogical#configuration-options)\n- [shared_buffers](https://www.postgresql.org/docs/16/runtime-config-resource.html#GUC-SHARED-BUFFERS)\n- [track_activity_query_size](https://www.postgresql.org/docs/16/runtime-config-statistics.html#GUC-TRACK-ACTIVITY-QUERY-SIZE)\n- [track_commit_timestamp](https://www.postgresql.org/docs/16/runtime-config-replication.html#GUC-TRACK-COMMIT-TIMESTAMP)\n- [wal_buffers](https://www.postgresql.org/docs/16/runtime-config-wal.html#GUC-WAL-BUFFERS)"]]