This page describes how to configure database flags for Cloud SQL, and lists the flags that you can set for your instance. You use database flags for many operations, including adjusting PostgreSQL parameters, adjusting options, and configuring and tuning an instance.
In some cases, setting one flag may require that you set another flag to fully enable the desired functionality.
When you set, remove, or modify a flag for a database instance, the database might be restarted. The flag value is then persisted for the instance until you remove it. If the instance is the source of a replica, and the instance is restarted, the replica is also restarted to align with the current configuration of the instance.
Configure database flags
Set a database flag
Console
- In the Google Cloud console, select the project that contains the Cloud SQL instance for which you want to set a database flag.
- Open the instance and click Edit.
- Scroll down to the Flags section.
- To set a flag that has not been set on the instance before, click Add item, choose the flag from the drop-down menu, and set its value.
- Click Save to save your changes.
- Confirm your changes under Flags on the Overview page.
gcloud
Edit the instance:
gcloud sql instances patch INSTANCE_NAME --database-flags=FLAG1=VALUE1,FLAG2=VALUE2
This command will overwrite all database flags previously set. To keep those and add new ones, include the values for all flags you want set on the instance; any flag not specifically included is set to its default value. For flags that do not take a value, specify the flag name followed by an equals sign ("=").
For example, to set the log_connections
and
log_min_error_statement
flags, you
can use the following command:
gcloud sql instances patch INSTANCE_NAME \ --database-flags=log_connections=on,log_min_error_statement=error
Terraform
To add database flags, use a Terraform resource.
Apply the changes
To apply your Terraform configuration in a Google Cloud project, complete the steps in the following sections.
Prepare Cloud Shell
- Launch Cloud Shell.
-
Set the default Google Cloud project where you want to apply your Terraform configurations.
You only need to run this command once per project, and you can run it in any directory.
export GOOGLE_CLOUD_PROJECT=PROJECT_ID
Environment variables are overridden if you set explicit values in the Terraform configuration file.
Prepare the directory
Each Terraform configuration file must have its own directory (also called a root module).
-
In Cloud Shell, create a directory and a new
file within that directory. The filename must have the
.tf
extension—for examplemain.tf
. In this tutorial, the file is referred to asmain.tf
.mkdir DIRECTORY && cd DIRECTORY && touch main.tf
-
If you are following a tutorial, you can copy the sample code in each section or step.
Copy the sample code into the newly created
main.tf
.Optionally, copy the code from GitHub. This is recommended when the Terraform snippet is part of an end-to-end solution.
- Review and modify the sample parameters to apply to your environment.
- Save your changes.
-
Initialize Terraform. You only need to do this once per directory.
terraform init
Optionally, to use the latest Google provider version, include the
-upgrade
option:terraform init -upgrade
Apply the changes
-
Review the configuration and verify that the resources that Terraform is going to create or
update match your expectations:
terraform plan
Make corrections to the configuration as necessary.
-
Apply the Terraform configuration by running the following command and entering
yes
at the prompt:terraform apply
Wait until Terraform displays the "Apply complete!" message.
- Open your Google Cloud project to view the results. In the Google Cloud console, navigate to your resources in the UI to make sure that Terraform has created or updated them.
Delete the changes
To delete your changes, do the following:
- To disable deletion protection, in your Terraform configuration file set the
deletion_protection
argument tofalse
.deletion_protection = "false"
- Apply the updated Terraform configuration by running the following command and
entering
yes
at the prompt:terraform apply
-
Remove resources previously applied with your Terraform configuration by running the following command and entering
yes
at the prompt:terraform destroy
REST v1
To set a flag for an existing database:
Before using any of the request data, make the following replacements:
- project-id: The project ID
- instance-id: The instance ID
HTTP method and URL:
PATCH https://sqladmin.googleapis.com/v1/projects/project-id/instances/instance-id
Request JSON body:
{ "settings": { "databaseFlags": [ { "name": "flag_name", "value": "flag_value" } ] } }
To send your request, expand one of these options:
You should receive a JSON response similar to the following:
If there are existing flags configured for the database, modify the previous
command to include them. The PATCH
command overwrites the existing
flags with the ones specified in the request.
REST v1beta4
To set a flag for an existing database:
Before using any of the request data, make the following replacements:
- project-id: The project ID
- instance-id: The instance ID
HTTP method and URL:
PATCH https://sqladmin.googleapis.com/sql/v1beta4/projects/project-id/instances/instance-id
Request JSON body:
{ "settings": { "databaseFlags": [ { "name": "flag_name", "value": "flag_value" } ] } }
To send your request, expand one of these options:
You should receive a JSON response similar to the following:
If there are existing flags configured for the database, modify the previous
command to include them. The PATCH
command overwrites the existing
flags with the ones specified in the request.
Clear all flags to their default values
Console
- In the Google Cloud console, select the project that contains the Cloud SQL instance for which you want to clear all flags.
- Open the instance and click Edit.
- Open the Database flags section.
- Click the X next to all of the flags shown.
- Click Save to save your changes.
gcloud
Clear all flags to their default values on an instance:
gcloud sql instances patch INSTANCE_NAME \ --clear-database-flags
You are prompted to confirm that the instance will be restarted.
REST v1
To clear all flags for an existing instance:
Before using any of the request data, make the following replacements:
- project-id: The project ID
- instance-id: The instance ID
HTTP method and URL:
PATCH https://sqladmin.googleapis.com/v1/projects/project-id/instances/instance-id
Request JSON body:
{ "settings": { "databaseFlags": [] } }
To send your request, expand one of these options:
You should receive a JSON response similar to the following:
REST v1beta4
To clear all flags for an existing instance:
Before using any of the request data, make the following replacements:
- project-id: The project ID
- instance-id: The instance ID
HTTP method and URL:
PATCH https://sqladmin.googleapis.com/sql/v1beta4/projects/project-id/instances/instance-id
Request JSON body:
{ "settings": { "databaseFlags": [] } }
To send your request, expand one of these options:
You should receive a JSON response similar to the following:
View current values of database flags
To view all current values of the PostgreSQL settings, log into your instance with thepsql
client and enter the following statement:
SELECT name, setting FROM pg_settings;
Note that you can change the value only for supported flags (as listed below).
Determine which database flags have been set for an instance
To see which flags have been set for a Cloud SQL instance:
Console
- In the Google Cloud console, select the project that contains the Cloud SQL instance for which you want to see the database flags that have been set.
- Select the instance to open its Instance Overview page.
The database flags that have been set are listed under the Database flags section.
gcloud
Get the instance state:
gcloud sql instances describe INSTANCE_NAME
In the output, database flags are listed under the settings
as
the collection databaseFlags
. For more information
about the representation of the flags in the output, see
Instances Resource Representation.
REST v1
To list flags configured for an instance:
Before using any of the request data, make the following replacements:
- project-id: The project ID
- instance-id: The instance ID
HTTP method and URL:
GET https://sqladmin.googleapis.com/v1/projects/project-id/instances/instance-id
To send your request, expand one of these options:
You should receive a JSON response similar to the following:
In the output, look for the databaseFlags
field.
REST v1beta4
To list flags configured for an instance:
Before using any of the request data, make the following replacements:
- project-id: The project ID
- instance-id: The instance ID
HTTP method and URL:
GET https://sqladmin.googleapis.com/sql/v1beta4/projects/project-id/instances/instance-id
To send your request, expand one of these options:
You should receive a JSON response similar to the following:
In the output, look for the databaseFlags
field.
Supported flags
Flags not mentioned below are not supported.
For a given flag, Cloud SQL might support a different value or range from the corresponding PostgreSQL parameter or option.
A | C | D | E | F | G | H | I | J | L | M | O | P | R | S | T | V | W
Cloud SQL Flag | Type Acceptable Values and Notes |
Restart Required? |
||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
anon.algorithm | String
The default is sha256. |
No | ||||||||||||||||||||
anon.maskschema | String
The default is mask. |
No | ||||||||||||||||||||
anon.restrict_to_trusted_schemas | boolean
on | off
The default is off. |
No | ||||||||||||||||||||
anon.salt | String
There's no default value. |
No | ||||||||||||||||||||
anon.sourceshema | String
The default is public. |
No | ||||||||||||||||||||
auto_explain.log_analyze | boolean
on | off
The default is off. |
No | ||||||||||||||||||||
auto_explain.log_buffers | boolean
on | off
The default is off. |
No | ||||||||||||||||||||
auto_explain.log_min_duration | Integer
-1 ... 2147483647
The default is -1. |
No | ||||||||||||||||||||
auto_explain.log_format | String
text|xml|json|yaml The default is text. |
No | ||||||||||||||||||||
auto_explain.log_level | String
debug5|debug4|debug3|debug2|debug1|debug| info|notice|warning|log
The default is log. Supported in PostgreSQL 12 and above. |
No | ||||||||||||||||||||
auto_explain.log_nested_statements | boolean
on | off
The default is off. |
No | ||||||||||||||||||||
auto_explain.log_settings | boolean
on | off
The default is off. Supported in PostgreSQL 12 and above. |
No | ||||||||||||||||||||
auto_explain.log_timing | boolean
on | off
The default is on. |
No | ||||||||||||||||||||
auto_explain.log_triggers | boolean
on | off
The default is off. |
No | ||||||||||||||||||||
auto_explain.log_wal | boolean
on | off
The default is off. Supported in PostgreSQL 13 and above. |
No | ||||||||||||||||||||
auto_explain.log_verbose | boolean
on | off
The default is off. |
No | ||||||||||||||||||||
auto_explain.sample_rate | Float
0 ... 1
The default is 1. |
No | ||||||||||||||||||||
autovacuum | boolean on | off
The default is on. For usage information that might affect the SLA, see the Operational guidelines for Cloud SQL for PostgreSQL instances. |
No | ||||||||||||||||||||
autovacuum_analyze_scale_factor | float 0 ... 100
The default is 0.1. |
No | ||||||||||||||||||||
autovacuum_analyze_threshold | integer 0 ... 2147483647
The default is 50. |
No | ||||||||||||||||||||
autovacuum_freeze_max_age | integer 100000 ... 2000000000
The default is 200000000. For usage information that might affect the SLA, see the Operational guidelines for Cloud SQL for PostgreSQL instances. |
Yes | ||||||||||||||||||||
autovacuum_max_workers | integer 1 ... varies (see note)
The default is 3. |
Yes | ||||||||||||||||||||
autovacuum_multixact_freeze_max_age | integer 10000 ... 2000000000
The default is 400000000. For usage information that might affect the SLA, see the Operational guidelines for Cloud SQL for PostgreSQL instances. |
Yes | ||||||||||||||||||||
autovacuum_naptime | integer 1 ... 2147483 s
The default is 60s. |
No | ||||||||||||||||||||
autovacuum_vacuum_cost_delay | integer 0 ... 100 ms, or -1 to use the vacuum_cost_delay valueFor PostgreSQL 9.6, 10, and 11, the default value is 2 ms. |
No | ||||||||||||||||||||
autovacuum_vacuum_cost_limit | integer 0 ... 10000 , or -1 to use the vacuum_cost_limit value
The default is -1. |
No | ||||||||||||||||||||
autovacuum_vacuum_insert_scale_factor | float 0 ... 100
The default is 0.2. |
No | ||||||||||||||||||||
autovacuum_vacuum_insert_threshold | integer -1 ... 2147483647
The default is 1000. |
No | ||||||||||||||||||||
autovacuum_vacuum_scale_factor | float 0 ... 100
The default is 0.2. |
No | ||||||||||||||||||||
autovacuum_vacuum_threshold | integer 0 ... 2147483647
The default is 50. |
No | ||||||||||||||||||||
autovacuum_work_mem | integer 0 ... 2147483647 KB, or -1 to use the maintenance_work_mem value
The default is -1. |
No | ||||||||||||||||||||
checkpoint_completion_target | float 0.0 ... 1.0
The default is 0.9. |
No | ||||||||||||||||||||
checkpoint_timeout | integer 30 ... 86,400 s
The default is 300s. For usage information that might affect the SLA, see the Operational guidelines for Cloud SQL for PostgreSQL instances. |
No | ||||||||||||||||||||
checkpoint_warning | integer 0 ... 2147483647 s
The default is 30s. |
No | ||||||||||||||||||||
cloudsql.allow_passwordless_local_connections |
boolean on | off
The default is off .
|
No | ||||||||||||||||||||
cloudsql.enable_anon | boolean on | off
The default is off .
|
No | ||||||||||||||||||||
cloudsql.enable_auto_explain |
boolean on | off
The default is off .
|
Yes | ||||||||||||||||||||
cloudsql.enable_maintenance_mode |
boolean on | off
The default is off .
|
Yes | ||||||||||||||||||||
cloudsql.enable_pgaudit | boolean on | off
The default is off. |
Yes | ||||||||||||||||||||
cloudsql.enable_pg_bigm |
boolean on | off
default: off
|
Yes | ||||||||||||||||||||
cloudsql.enable_pg_cron |
boolean on | off
The default is off .
Supported in PostgreSQL 10 and above. |
Yes | ||||||||||||||||||||
cloudsql.enable_pg_hint_plan |
boolean on | off
The default is off .
|
Yes | ||||||||||||||||||||
cloudsql.enable_pglogical |
boolean on | off
The default is off .
|
Yes | ||||||||||||||||||||
cloudsql.enable_pg_squeeze |
boolean on | off
The default is off .
|
Yes | ||||||||||||||||||||
cloudsql.enable_pg_wait_sampling | boolean on | off
|
Yes | ||||||||||||||||||||
cloudsql.iam_authentication | boolean on | off
The default is off .
|
No | ||||||||||||||||||||
cloudsql.logical_decoding | boolean on | off
The default is off .
|
Yes | ||||||||||||||||||||
cloudsql.max_failed_attempts_user | integer 0 ... 10000
The default is 10. |
Yes | ||||||||||||||||||||
cloudsql.pg_authid_select_role | string |
No | ||||||||||||||||||||
commit_delay | integer 0 ... 100000
The default is 0. |
No | ||||||||||||||||||||
commit_siblings | integer 0 ... 1000
The default is 5. |
No | ||||||||||||||||||||
constraint_exclusion | enumeration partition | on | off
The default is partition. |
No | ||||||||||||||||||||
cpu_index_tuple_cost | float 0.0 ... inf
The default is 0.005. |
No | ||||||||||||||||||||
cpu_operator_cost | float 0.0 ... inf
The default is 0.0025. |
No | ||||||||||||||||||||
cpu_tuple_cost | float 0.0 ... inf
The default is 0.01. |
No | ||||||||||||||||||||
cron.database_name | String .
Supported in PostgreSQL 10 and above. |
Yes | ||||||||||||||||||||
cron.log_statement | boolean
on | off
The default is on. Supported in PostgreSQL 10 and above. |
Yes | ||||||||||||||||||||
cron.log_run | boolean
on | off
The default is on. Supported in PostgreSQL 10 and above. |
Yes | ||||||||||||||||||||
cron.max_running_jobs | Integer
0 ... varies
The default is 5. Supported in PostgreSQL 10 and above. |
Yes | ||||||||||||||||||||
cron.log_min_messages | String
debug5|debug4|debug3|debug2|debug1|debug| info|notice|warning|error|log|fatal|panic
The default is warning. Supported in PostgreSQL 10 and above. |
No | ||||||||||||||||||||
cursor_tuple_fraction | float 0.0 ... 1.0
The default is 0.1. |
No | ||||||||||||||||||||
deadlock_timeout | integer 1 ... 2147483647 ms
The default is 1000ms. |
No | ||||||||||||||||||||
default_statistics_target | integer 1 ... 10000
The default is 100. |
No | ||||||||||||||||||||
default_tablespace | string |
No | ||||||||||||||||||||
default_transaction_deferrable | boolean on | off
The default is off. |
No | ||||||||||||||||||||
default_transaction_isolation | enumeration serializable | 'repeatable read' | 'read committed' | 'read uncommitted'
The default is 'read committed'. |
No | ||||||||||||||||||||
effective_cache_size | integer The size range is from 10% - 70% of the instance's memory. Unit is 8 KB.
The default is 40% of VM memory. For example, for a 45GB instance memory, the default value is 18537160 KB. |
No | ||||||||||||||||||||
effective_io_concurrency | integer 0 ... 1000
The default is 1. |
No | ||||||||||||||||||||
enable_bitmapscan | boolean on | off
The default is on. |
No | ||||||||||||||||||||
enable_hashagg | boolean on | off
The default is on. |
No | ||||||||||||||||||||
enable_hashjoin | boolean on | off
The default is on. |
No | ||||||||||||||||||||
enable_indexonlyscan | boolean on | off
The default is on. |
No | ||||||||||||||||||||
enable_indexscan | boolean on | off
The default is on. |
No | ||||||||||||||||||||
enable_material | boolean on | off
The default is on |
No | ||||||||||||||||||||
enable_mergejoin | boolean on | off
The default is on. |
No | ||||||||||||||||||||
enable_nestloop | boolean on | off
The default is on. |
No | ||||||||||||||||||||
enable_seqscan | boolean on | off
The default is on. |
No | ||||||||||||||||||||
enable_sort | boolean on | off
The default is on. |
No | ||||||||||||||||||||
enable_tidscan | boolean on | off
The default is on. |
No | ||||||||||||||||||||
force_parallel_mode | enumeration off | on | regress
The default is off. |
No | ||||||||||||||||||||
from_collapse_limit | integer 1 ... 2147483647
The default is 8. |
No | ||||||||||||||||||||
geqo | boolean on | off
The default is on. |
No | ||||||||||||||||||||
geqo_effort | integer 1 ... 10
The default is 5. |
No | ||||||||||||||||||||
geqo_generations | integer 0 ... 2147483647
The default is 0. |
No | ||||||||||||||||||||
geqo_pool_size | integer 0 ... 2147483647
The default is 0. |
No | ||||||||||||||||||||
geqo_seed | float 0.0 ... 1.0
The default is 0. |
No | ||||||||||||||||||||
geqo_selection_bias | float 1.5 ... 2.0
The default is 2. |
No | ||||||||||||||||||||
geqo_threshold | integer 2 ... 2147483647
The default is 12. |
No | ||||||||||||||||||||
gin_fuzzy_search_limit | integer 0 ... 2147483647
The default is 0. |
No | ||||||||||||||||||||
gin_pending_list_limit | integer 64 ... 2147483647 KB
The default is 4096KB. |
No | ||||||||||||||||||||
hash_mem_multiplier | float 1 ... 1000
The default is 2. |
No | ||||||||||||||||||||
hot_standby_feedback | boolean on | off
The default is off. |
No | ||||||||||||||||||||
huge_pages | enumeration try | off
The default is try. |
Yes | ||||||||||||||||||||
idle_in_transaction_session_timeout | integer 0 ... 2147483647 ms
The default is 0. |
No | ||||||||||||||||||||
ivfflat.probes | integer
1 ... varies
The default is 1. Supported in PostgreSQL 11 and above. |
No | ||||||||||||||||||||
join_collapse_limit | integer 1 ... 2147483647
The default is 8. |
No | ||||||||||||||||||||
lock_timeout | integer 0 ... 2147483647 ms
The default is 0. |
No | ||||||||||||||||||||
log_autovacuum_min_duration | integer 0 ... 2147483647 ms, or -1 to disable
The default is 0. |
No | ||||||||||||||||||||
log_checkpoints | boolean on | off
The default is off. |
No | ||||||||||||||||||||
log_connections | boolean on | off
The default is off. |
No | ||||||||||||||||||||
log_disconnections | boolean on | off
The default is off. |
No | ||||||||||||||||||||
log_duration | boolean on | off
The default is off. |
No | ||||||||||||||||||||
log_error_verbosity | enumeration terse | default | verbose
The default is default. |
No | ||||||||||||||||||||
log_executor_stats | boolean on | off
The default is off. |
No | ||||||||||||||||||||
log_hostname | boolean on | off
The default is off. |
No | ||||||||||||||||||||
log_line_prefix | String A printf-style string that's generated at the beginning of each line of a log file. The default is %m [%p]: [%l-1] db=%d,user=%u ,
which logs timestamp, process ID, database, and username. |
No | ||||||||||||||||||||
log_lock_waits | boolean on | off
The default is off. |
No | ||||||||||||||||||||
log_min_duration_statement | integer -1 ... 2147483647 ms
The default is -1. |
No | ||||||||||||||||||||
log_min_error_statement | enumeration debug5 | debug4 | debug3 |
debug2 | debug1 | info |
notice | warning | error |
log | fatal | panic
The default is error. |
No | ||||||||||||||||||||
log_min_messages | enumeration debug5 | debug4 | debug3 |
debug2 | debug1 | info |
notice | warning | error |
log | fatal | panic
The default is warning. |
No | ||||||||||||||||||||
log_parser_stats | boolean on | off
The default is off. |
No | ||||||||||||||||||||
log_planner_stats | boolean on | off
The default is off. |
No | ||||||||||||||||||||
log_replication_commands | boolean on | off
The default is off. |
No | ||||||||||||||||||||
log_statement | enumeration none | ddl | mod | all
Set to mod to log all Data definition language (DDL)
statements, plus data-modifying statements such as INSERT , UPDATE , DELETE , TRUNCATE
The default is none. |
No | ||||||||||||||||||||
log_statement_stats | boolean on | off
May not be enabled together with log_parser_stats , log_planner_stats , or log_executor_stats .
The default is off. |
No | ||||||||||||||||||||
log_temp_files | integer 0 ... 2147483647 KB, or -1 to disable
The default is 0. |
No | ||||||||||||||||||||
log_timezone | string This flag provides Cloud SQL for PostgreSQL users with a way to set the time zone used for timestamps that are written in the server log. You specify time zones by name. For example, You must update this flag manually, on the primary instance and on all read replicas, to account for it. Timezone names are case insensitive. You can supply the timezone name in any case. We support |
Yes | ||||||||||||||||||||
logical_decoding_work_mem | integer 64 ... 2147483647
The default is 65536. |
No | ||||||||||||||||||||
maintenance_io_concurrency | integer 0 ... 1000
The default is 10. |
No | ||||||||||||||||||||
maintenance_work_mem | integer 1024 ... 2147483647 KB
The default is 64 MB. |
No | ||||||||||||||||||||
max_connections | integer 14 ... varies (see note)
The default value depends on the amount of memory of the largest instance in the chain of primaries (this instance; and, if it's a read replica, its primary, its primary's primary, etc. all the way up to the root of the replication tree).
The value on replicas must be greater than or equal to the value on the primary. Changes on the primary propagate to replicas that have a value that is lower than the new value on the primary, or that have not been changed from the default value. Such changes on the primary cause the replica to restart. |
Yes | ||||||||||||||||||||
max_locks_per_transaction | integer 10 ... 2,147,483,647
The default is 64. The value on replicas must be greater than or equal to the value on the primary. Changes on the primary propagate to replicas that have a value that is lower than the new value on the primary, or that have not been changed from the default value. Such changes on the primary cause the replica to restart. |
Yes | ||||||||||||||||||||
max_logical_replication_workers | integer 4 ... 8192
The default is 4. Supported in PostgreSQL 10 and above. |
Yes | ||||||||||||||||||||
max_parallel_maintenance_workers | integer 0 ... varies
The default is 2. Supported in PostgreSQL 11 and above. The value on replicas must be greater than or equal to the value on the primary. Changes on the primary propagate to replicas that have a value that's lower than the new value on the primary, or that haven't been changed from the default value. If the value on the primary is |
No | ||||||||||||||||||||
max_parallel_workers | integer 0 ... varies
The default is 8. Supported in PostgreSQL 10 and above. The value on replicas must be greater than or equal to the value on the primary. Changes on the primary propagate to replicas that have a value that's lower than the new value on the primary, or that haven't been changed from the default value. If the value on the primary is |
No | ||||||||||||||||||||
max_parallel_workers_per_gather | integer 0 ... varies
The default is 2. The value on replicas must be greater than or equal to the value on the primary. Changes on the primary propagate to replicas that have a value that's lower than the new value on the primary, or that haven't been changed from the default value. If the value on the primary is |
No | ||||||||||||||||||||
max_pred_locks_per_page | integer 0 ... 2147483647
The default is 2. Supported in PostgreSQL 10 and above. |
Yes | ||||||||||||||||||||
max_pred_locks_per_relation | integer -2147483648 ... 2147483647
The default is -2. Supported in PostgreSQL 10 and above. |
Yes | ||||||||||||||||||||
max_pred_locks_per_transaction | integer 64 ... 1048576
|
Yes | ||||||||||||||||||||
max_prepared_transactions | integer 0 ... varies
The value on replicas must be greater than or equal to the value on the primary. Changes on the primary propagate to replicas that have a value that is lower than the new value on the primary, or that have not been changed from the default value. Such changes on the primary cause the replica to restart. |
Yes | ||||||||||||||||||||
max_replication_slots | integer 10 ... varies
The default is 10. |
Yes | ||||||||||||||||||||
max_standby_archive_delay | integer 0 ... 2147483647 ms,
or -1 to wait forever
|
No | ||||||||||||||||||||
max_standby_streaming_delay | integer 0 ... 2147483647 ms, or -1 to wait forever |
No | ||||||||||||||||||||
max_sync_workers_per_subscription | integer 2 ... 64
Cannot be greater than max_logical_replication_workers .
|
No | ||||||||||||||||||||
max_wal_senders | integer 10 ... varies
The default is 10. The value on replicas must be greater than or equal to the value on the primary. Changes on the primary propagate to replicas that have a value that is lower than the new value on the primary, or that have not been changed from the default value. Such changes on the primary cause the replica to restart. |
Yes | ||||||||||||||||||||
max_wal_size | integer 2 ... 2147483647
The unit is 16 MB (the WAL file size) for version 9.6 and 1 MB for PostgreSQL 10 and above. The default value is |
No | ||||||||||||||||||||
max_worker_processes | integer 8 ... varies
The value on replicas must be greater than or equal to the value on the primary. Changes on the primary propagate to replicas that have a value that is lower than the new value on the primary, or that have not been changed from the default value. Such changes on the primary cause the replica to restart. |
Yes | ||||||||||||||||||||
min_parallel_relation_size | integer 0 ... 715827882
Unit is 8 KB
Supported only in PostgreSQL 9.6. |
No | ||||||||||||||||||||
min_wal_size | integer 32 ... 2147483647
The unit is 16 MB (the WAL file size) for version 9.6 and 1 MB for PostgreSQL 10 and above. |
No | ||||||||||||||||||||
old_snapshot_threshold | integer 0 ... 86400 min, or -1 to disable
The default is -1. |
Yes | ||||||||||||||||||||
parallel_setup_cost | float 0.0 ... inf
The default is 1000. |
No | ||||||||||||||||||||
parallel_tuple_cost | float 0.0 ... inf
The default is 0.1. |
No | ||||||||||||||||||||
password_encryption | enumeration md5 | scram-sha-256
The default depends on the PostgreSQL version. For PostgreSQL
versions 10 to 13, the default is |
No | ||||||||||||||||||||
pg_bigm.enable_recheck | boolean
on | off
|
No | ||||||||||||||||||||
pg_bigm.gin_key_limit | integer 0 ... 2147483647 |
No | ||||||||||||||||||||
pg_bigm.similarity_limit | float 0.0 ... 1.0 |
No | ||||||||||||||||||||
pg_hint_plan.enable_hint | boolean
on | off
The default is on. |
No | ||||||||||||||||||||
pg_hint_plan.debug_print | String
off|on|detailed|verbose|0|1||2|3|no|yes|false|true
The default is off. |
No | ||||||||||||||||||||
pg_hint_plan.parse_messages | String
debug5|debug4|debug3|debug2|debug1|debug| info|notice|warning|error|log
The default is info. |
No | ||||||||||||||||||||
pg_hint_plan.message_level | String
debug5|debug4|debug3|debug2|debug1|debug| info|notice|warning|error|log
The default is log. |
No | ||||||||||||||||||||
pg_hint_plan.enable_hint_table | boolean
on | off
The default is off. |
No | ||||||||||||||||||||
pglogical.batch_inserts |
boolean on | off
The default is off .
|
Yes | ||||||||||||||||||||
pglogical.conflict_log_level |
String The default is LOG .This flag accepts the same values as log_min_messages .
|
No | ||||||||||||||||||||
pglogical.conflict_resolution |
String error|apply_remote|keep_local|last_update_wins|first_update_wins
The default is apply_remote .
|
No | ||||||||||||||||||||
pglogical.extra_connection_options |
String
Accepts PostgreSQL keyword/value connection strings. The default is the empty string. |
No | ||||||||||||||||||||
pglogical.synchronous_commit |
boolean on | off
The default is on .
|
Yes | ||||||||||||||||||||
pglogical.use_spi |
boolean on | off
The default is off .
|
Yes | ||||||||||||||||||||
pg_stat_statements.max | integer 100 ... 2147483647
The default is 5000. |
Yes | ||||||||||||||||||||
pg_stat_statements.save | boolean on | off
The default is on. |
No | ||||||||||||||||||||
pg_stat_statements.track | enumeration none | top | all
The default is top. |
No | ||||||||||||||||||||
pg_stat_statements.track_utility | boolean on | off
The default is on. |
No | ||||||||||||||||||||
pgaudit.log | enumeration read | write |
function | role | ddl |
misc | misc_set | all|none
You can provide multiple classes using a comma-separated list, and
subtract a class by prefacing the class with
a |
No | ||||||||||||||||||||
pgaudit.log_catalog | boolean on | off
The default is on .
|
No | ||||||||||||||||||||
pgaudit.log_client | boolean on | off
The default is off .
|
No | ||||||||||||||||||||
pgaudit.log_level | enumeration debug5 |
debug4 | debug3 | debug2 |
debug1 | info | notice |
warning | error | log
The default is log . Additionally,
pgaudit.log_level is enabled only when
pgaudit.log_client is on.
|
No | ||||||||||||||||||||
pgaudit.log_parameter | boolean on | off
The default is off .
|
No | ||||||||||||||||||||
pgaudit.log_relation | boolean on | off
The default is off .
|
No | ||||||||||||||||||||
pgaudit.log_statement_once | boolean on | off
The default is off .
|
No | ||||||||||||||||||||
pgaudit.role | string
There is no default. |
No | ||||||||||||||||||||
pgtt.enabled | boolean on | off
The default is on. |
No | ||||||||||||||||||||
pg_wait_sampling.history_period | integer 1 ... 2147483647 |
No | ||||||||||||||||||||
pg_wait_sampling.history_size | integer 1 ... 2147483647 |
No | ||||||||||||||||||||
pg_wait_sampling.profile_period | integer 1 ... 2147483647 |
No | ||||||||||||||||||||
pg_wait_sampling.profile_pid | boolean on | off |
No | ||||||||||||||||||||
pg_wait_sampling.profile_queries | boolean on | off |
No | ||||||||||||||||||||
random_page_cost | float 0.0 ... inf
The default is 4. |
No | ||||||||||||||||||||
rdkit.agent_FP_bit_ratio | float 0 ... 3 |
No | ||||||||||||||||||||
rdkit.avalon_fp_size | integer 64 ... 9192 |
No | ||||||||||||||||||||
rdkit.dice_threshold | float 0 ... 1 |
No | ||||||||||||||||||||
rdkit.difference_FP_weight_agents | integer -10 ... 10 |
No | ||||||||||||||||||||
rdkit.difference_FP_weight_nonagents | integer 1 ... 20 |
No | ||||||||||||||||||||
rdkit.do_chiral_sss | boolean on | off |
No | ||||||||||||||||||||
rdkit.do_enhanced_stereo_sss | boolean on | off |
No | ||||||||||||||||||||
rdkit.featmorgan_fp_size | integer 64 ... 9192 |
No | ||||||||||||||||||||
rdkit.hashed_atompair_fp_size | integer 64 ... 9192 |
No | ||||||||||||||||||||
rdkit.hashed_torsion_fp_size | integer 64 ... 9192 |
No | ||||||||||||||||||||
rdkit.ignore_reaction_agents | boolean on | off |
No | ||||||||||||||||||||
rdkit.init_reaction | boolean on | off |
No | ||||||||||||||||||||
rdkit.layered_fp_size | integer 64 ... 9192 |
No | ||||||||||||||||||||
rdkit.morgan_fp_size | integer 64 ... 9192 |
No | ||||||||||||||||||||
rdkit.move_unmmapped_reactants_to_agents | boolean on | off |
No | ||||||||||||||||||||
rdkit.rdkit_fp_size | integer 64 ... 9192 |
No | ||||||||||||||||||||
rdkit.reaction_difference_fp_size | integer 64 ... 9192 |
No | ||||||||||||||||||||
rdkit.reaction_difference_fp_type | integer 1 ... 3 |
No | ||||||||||||||||||||
rdkit.reaction_sss_fp_size | integer 64 ... 9192 |
No | ||||||||||||||||||||
rdkit.reaction_sss_fp_type | integer 1 ... 5 |
No | ||||||||||||||||||||
rdkit.sss_fp_size | integer 64 ... 4096 |
No | ||||||||||||||||||||
rdkit.tanimoto_threshold | float 0 ... 1 |
No | ||||||||||||||||||||
rdkit.threshold_unmapped_reactant_atoms | float 0 ... 1 |
No | ||||||||||||||||||||
replacement_sort_tuples | integer 0 ... 2147483647
|
No | ||||||||||||||||||||
session_replication_role | enumeration origin | replica | local
Can be set only in current session |
- | ||||||||||||||||||||
shared_buffers | integer The size range is from 10% - 60% of the instance's memory. Unit is 8 KB.
The default is one-third of the instance's total VM memory (in MB). For example, for 45 GB of instance memory, the default value is 15085 MB.
|
Yes | ||||||||||||||||||||
squeeze.max_xlock_time | integer 1 ... 2147483647 |
No | ||||||||||||||||||||
squeeze.worker_autostart | string |
Yes | ||||||||||||||||||||
squeeze.worker_role | string |
Yes | ||||||||||||||||||||
ssl_max_protocol_version | enumeration Postgres 14: Sets the maximum SSL/TLS protocol version to use. Valid values are as for ssl_min_protocol_version , with the addition of an empty string,
which allows any protocol version to be specified.
Supported in PostgreSQL 12 and above. |
No | ||||||||||||||||||||
ssl_min_protocol_version | enumeration Postgres 14: Sets the minimum SSL/TLS protocol version to use. Valid values are currently: TLSv1 ,
TLSv1.1 , TLSv1.2 , TLSv1.3 .
The default is TLSv1 .
Supported in PostgreSQL 12 and above. |
No | ||||||||||||||||||||
standard_conforming_strings | boolean on | off
The default is on. |
No | ||||||||||||||||||||
synchronize_seqscans | boolean on | off
The default is on. |
No | ||||||||||||||||||||
tcp_keepalives_count | integer 0 ... 2147483647
The default is 5. |
No | ||||||||||||||||||||
tcp_keepalives_idle | integer 0 ... 2147483647
The default is 60. |
No | ||||||||||||||||||||
tcp_keepalives_interval | integer 0 ... 2147483647
The default is 60. |
No | ||||||||||||||||||||
temp_buffers | integer 100 ... 1,073,741,823
Unit is 8 KB |
No | ||||||||||||||||||||
temp_file_limit | integer 1048576 ... 2147483647 KB
The default is 10% of the initial disk size. For example, for a 100-GB disk, the default value is 10262623 KB. |
No | ||||||||||||||||||||
TimeZone | string This flag provides Cloud SQL for PostgreSQL users with a way to set the time zone for displaying and analyzing timestamps. You specify time zones by name. For example, You must update this flag manually, on the primary instance and on all read replicas, to account for it. Timezone names are case insensitive. You can supply the timezone name in any case. We support |
Yes | ||||||||||||||||||||
trace_notify | boolean on | off
The default is off. |
No | ||||||||||||||||||||
trace_recovery_messages | enumeration debug5 | debug4 | debug3 |
debug2 | debug1 | log |
notice | warning | error
The default is log. |
No | ||||||||||||||||||||
trace_sort | boolean on | off
The default is off. |
No | ||||||||||||||||||||
track_activities | boolean on | off
The default is on. |
No | ||||||||||||||||||||
track_activity_query_size | integer 100 ... 102400
The default is 1 KB. |
Yes | ||||||||||||||||||||
track_commit_timestamp | boolean on | off
The default is off. |
Yes | ||||||||||||||||||||
track_counts | boolean on | off
The default is on. |
No | ||||||||||||||||||||
track_functions | enumeration none | pl | all
The default is none. |
No | ||||||||||||||||||||
track_io_timing | boolean on | off
The default is off. |
No | ||||||||||||||||||||
vacuum_cost_delay | integer 0 ... 100 ms
The default is 0. |
No | ||||||||||||||||||||
vacuum_cost_limit | integer 1 ... 10000
The default is 200. |
No | ||||||||||||||||||||
vacuum_failsafe_age | integer 0 ... 2100000000
The default is 1600000000. |
No | ||||||||||||||||||||
vacuum_freeze_min_age | integer 0 ... 1000000000
The default is 50000000. |
No | ||||||||||||||||||||
vacuum_freeze_table_age | integer 0 ... 2000000000
The default is 150000000. |
No | ||||||||||||||||||||
vacuum_multixact_failsafe_age | integer 0 ... 2100000000
The default is 1600000000. |
No | ||||||||||||||||||||
vacuum_multixact_freeze_min_age | integer 0 ... 1000000000
The default is 5000000. |
No | ||||||||||||||||||||
vacuum_multixact_freeze_table_age | integer 0 ... 2000000000
The default is 150000000. |
No | ||||||||||||||||||||
wal_buffers | integer The size range is from -1 - 5% of the instance's memory. Unit is 8 KB.
The default is 16 MB. |
Yes | ||||||||||||||||||||
wal_compression | enumeration off | on | pglz | lz4 | zstd
The default is off. |
No | ||||||||||||||||||||
wal_receiver_timeout | integer 0 ... 2147483647
The default is 60 seconds. This flag affects the WAL sender and receiver. If not appropriately set, this flag affects logical and physical replication. This flag also affects replication performance and latency. A value of zero disables the timeout mechanism. The unit is milliseconds. |
No | ||||||||||||||||||||
wal_sender_timeout | integer 0 ... 2147483647
The default is 60 seconds. This flag affects the WAL sender and receiver. If not appropriately set, this flag affects logical and physical replication. This flag also affects replication performance and latency. A value of zero disables the timeout mechanism. The unit is milliseconds. |
No | ||||||||||||||||||||
work_mem | integer 64 ... 2147483647 KB
The default is 4 MB. |
No |
Special flags
bgwriter
PostgreSQL has a background writer (bgwriter
) flag. This flag issues writes of
new or modified shared buffers. These shared buffers are known as dirty buffers.
When the number of clean shared buffers is insufficient, the background writer
writes dirty buffers to the file system and marks them as clean.
Two flags associated with the bgwriter
flag are bgwriter_delay
and bgwriter_lru_maxpages
. bgwriter_delay
specifies the delay between activity
rounds for the background writer in milliseconds (ms), and bgwriter_lru_maxpages
specifies how many buffers will be written by the background writer.
The default value for the bgwriter
flag is 200 ms
. However, if
you select a solid state drive (SSD) that's greater than 500 GB, then the value
of the bgwriter_delay
flag is set to 50
, and the value of
the bgwriter_lru_maxpages
flag is set to 200
.
For more information about the background writer, see the PostgreSQL documentation.
session_replication_role
PostgreSQL has the session_replication_role
flag, which is designed to be used
for logical replication and lets you disable constraint triggers in
individual sessions.
Sometimes this flag can also be used for some maintenance operations to circumvent constraint (most often Foreign Key) checks.
This flag can be set in a session by any user which has the REPLICATION
property set. The REPLICATION
property for any user can be set by
cloudsqlsuperuser
when one of flags
cloudsql.enable_pglogical or
cloudsql.logical_decoding is set for the instance.
This flag can not be set for the whole instance.
Troubleshooting
Issue | Troubleshooting |
---|---|
You set the time zone for a session, but it expires when you log off. |
Connect to the database and set the database time zone to the one you want, either per user or per database. In Cloud SQL for PostgreSQL, you can specify the following.
These settings remain after a session is closed, mimicking a
ALTER DATABASE dbname SET TIMEZONE TO 'timezone'; ALTER USER username SET TIMEZONE TO 'timezone'; These settings apply only to new connections to the database. To see the change to the time zone, disconnect from the instance and then reconnect to it. |
What's next
- Learn more about PostgreSQL server configuration.
- Learn more about Operational Guidelines.