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Use the SHOW ZONE CONFIGURATIONS statement to view details about existing replication zones.
Synopsis
Required privileges
No privileges are required to list replication zones.
Parameters
| Parameter | Description |
|---|---|
zone_name |
The name of the system range for which to show replication zone configurations. |
database_name |
The name of the database for which to show replication zone configurations. |
table_name |
The name of the table for which to show replication zone configurations. |
partition_name |
The name of the partition for which to show replication zone configurations. |
index_name |
The name of the index for which to show replication zone configurations. |
Examples
Setup
The following examples use MovR, a fictional vehicle-sharing application, to demonstrate CockroachDB SQL statements. For more information about the MovR example application and dataset, see MovR: A Global Vehicle-sharing App.
To follow along, run cockroach demo with the --geo-partitioned-replicas flag. This command opens an interactive SQL shell to a temporary, 9-node in-memory cluster with the movr database.
$ cockroach demo --geo-partitioned-replicas
View all replication zones
> SHOW ALL ZONE CONFIGURATIONS;
target | raw_config_sql
-------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------
RANGE default | ALTER RANGE default CONFIGURE ZONE USING
| range_min_bytes = 134217728,
| range_max_bytes = 536870912,
| gc.ttlseconds = 90000,
| num_replicas = 3,
| constraints = '[]',
| lease_preferences = '[]'
DATABASE system | ALTER DATABASE system CONFIGURE ZONE USING
| range_min_bytes = 134217728,
| range_max_bytes = 536870912,
| gc.ttlseconds = 90000,
| num_replicas = 5,
| constraints = '[]',
| lease_preferences = '[]'
RANGE meta | ALTER RANGE meta CONFIGURE ZONE USING
| range_min_bytes = 134217728,
| range_max_bytes = 536870912,
| gc.ttlseconds = 3600,
| num_replicas = 5,
| constraints = '[]',
| lease_preferences = '[]'
RANGE system | ALTER RANGE system CONFIGURE ZONE USING
| range_min_bytes = 134217728,
| range_max_bytes = 536870912,
| gc.ttlseconds = 90000,
| num_replicas = 5,
| constraints = '[]',
| lease_preferences = '[]'
RANGE liveness | ALTER RANGE liveness CONFIGURE ZONE USING
| range_min_bytes = 134217728,
| range_max_bytes = 536870912,
| gc.ttlseconds = 600,
| num_replicas = 5,
| constraints = '[]',
| lease_preferences = '[]'
TABLE system.public.replication_constraint_stats | ALTER TABLE system.public.replication_constraint_stats CONFIGURE ZONE USING
| gc.ttlseconds = 600,
| constraints = '[]',
| lease_preferences = '[]'
TABLE system.public.replication_stats | ALTER TABLE system.public.replication_stats CONFIGURE ZONE USING
| gc.ttlseconds = 600,
| constraints = '[]',
| lease_preferences = '[]'
PARTITION us_west OF INDEX movr.public.users@primary | ALTER PARTITION us_west OF INDEX movr.public.users@primary CONFIGURE ZONE USING
| constraints = '[+region=us-west1]'
PARTITION us_east OF INDEX movr.public.users@primary | ALTER PARTITION us_east OF INDEX movr.public.users@primary CONFIGURE ZONE USING
| constraints = '[+region=us-east1]'
PARTITION europe_west OF INDEX movr.public.users@primary | ALTER PARTITION europe_west OF INDEX movr.public.users@primary CONFIGURE ZONE USING
| constraints = '[+region=europe-west1]'
PARTITION us_west OF INDEX movr.public.vehicles@primary | ALTER PARTITION us_west OF INDEX movr.public.vehicles@primary CONFIGURE ZONE USING
| constraints = '[+region=us-west1]'
PARTITION us_west OF INDEX movr.public.vehicles@vehicles_auto_index_fk_city_ref_users | ALTER PARTITION us_west OF INDEX movr.public.vehicles@vehicles_auto_index_fk_city_ref_users CONFIGURE ZONE USING
| constraints = '[+region=us-west1]'
PARTITION us_east OF INDEX movr.public.vehicles@primary | ALTER PARTITION us_east OF INDEX movr.public.vehicles@primary CONFIGURE ZONE USING
| constraints = '[+region=us-east1]'
PARTITION us_east OF INDEX movr.public.vehicles@vehicles_auto_index_fk_city_ref_users | ALTER PARTITION us_east OF INDEX movr.public.vehicles@vehicles_auto_index_fk_city_ref_users CONFIGURE ZONE USING
| constraints = '[+region=us-east1]'
PARTITION europe_west OF INDEX movr.public.vehicles@primary | ALTER PARTITION europe_west OF INDEX movr.public.vehicles@primary CONFIGURE ZONE USING
| constraints = '[+region=europe-west1]'
PARTITION europe_west OF INDEX movr.public.vehicles@vehicles_auto_index_fk_city_ref_users | ALTER PARTITION europe_west OF INDEX movr.public.vehicles@vehicles_auto_index_fk_city_ref_users CONFIGURE ZONE USING
| constraints = '[+region=europe-west1]'
PARTITION us_west OF INDEX movr.public.rides@primary | ALTER PARTITION us_west OF INDEX movr.public.rides@primary CONFIGURE ZONE USING
| constraints = '[+region=us-west1]'
PARTITION us_west OF INDEX movr.public.rides@rides_auto_index_fk_city_ref_users | ALTER PARTITION us_west OF INDEX movr.public.rides@rides_auto_index_fk_city_ref_users CONFIGURE ZONE USING
| constraints = '[+region=us-west1]'
PARTITION us_west OF INDEX movr.public.rides@rides_auto_index_fk_vehicle_city_ref_vehicles | ALTER PARTITION us_west OF INDEX movr.public.rides@rides_auto_index_fk_vehicle_city_ref_vehicles CONFIGURE ZONE USING
| constraints = '[+region=us-west1]'
PARTITION us_east OF INDEX movr.public.rides@primary | ALTER PARTITION us_east OF INDEX movr.public.rides@primary CONFIGURE ZONE USING
| constraints = '[+region=us-east1]'
PARTITION us_east OF INDEX movr.public.rides@rides_auto_index_fk_city_ref_users | ALTER PARTITION us_east OF INDEX movr.public.rides@rides_auto_index_fk_city_ref_users CONFIGURE ZONE USING
| constraints = '[+region=us-east1]'
PARTITION us_east OF INDEX movr.public.rides@rides_auto_index_fk_vehicle_city_ref_vehicles | ALTER PARTITION us_east OF INDEX movr.public.rides@rides_auto_index_fk_vehicle_city_ref_vehicles CONFIGURE ZONE USING
| constraints = '[+region=us-east1]'
PARTITION europe_west OF INDEX movr.public.rides@primary | ALTER PARTITION europe_west OF INDEX movr.public.rides@primary CONFIGURE ZONE USING
| constraints = '[+region=europe-west1]'
PARTITION europe_west OF INDEX movr.public.rides@rides_auto_index_fk_city_ref_users | ALTER PARTITION europe_west OF INDEX movr.public.rides@rides_auto_index_fk_city_ref_users CONFIGURE ZONE USING
| constraints = '[+region=europe-west1]'
PARTITION europe_west OF INDEX movr.public.rides@rides_auto_index_fk_vehicle_city_ref_vehicles | ALTER PARTITION europe_west OF INDEX movr.public.rides@rides_auto_index_fk_vehicle_city_ref_vehicles CONFIGURE ZONE USING
| constraints = '[+region=europe-west1]'
PARTITION us_west OF INDEX movr.public.vehicle_location_histories@primary | ALTER PARTITION us_west OF INDEX movr.public.vehicle_location_histories@primary CONFIGURE ZONE USING
| constraints = '[+region=us-west1]'
PARTITION us_east OF INDEX movr.public.vehicle_location_histories@primary | ALTER PARTITION us_east OF INDEX movr.public.vehicle_location_histories@primary CONFIGURE ZONE USING
| constraints = '[+region=us-east1]'
PARTITION europe_west OF INDEX movr.public.vehicle_location_histories@primary | ALTER PARTITION europe_west OF INDEX movr.public.vehicle_location_histories@primary CONFIGURE ZONE USING
| constraints = '[+region=europe-west1]'
TABLE movr.public.promo_codes | ALTER TABLE movr.public.promo_codes CONFIGURE ZONE USING
| num_replicas = 3,
| constraints = '{+region=us-east1: 1}',
| lease_preferences = '[[+region=us-east1]]'
INDEX movr.public.promo_codes@promo_codes_idx_us_west | ALTER INDEX movr.public.promo_codes@promo_codes_idx_us_west CONFIGURE ZONE USING
| num_replicas = 3,
| constraints = '{+region=us-west1: 1}',
| lease_preferences = '[[+region=us-west1]]'
INDEX movr.public.promo_codes@promo_codes_idx_europe_west | ALTER INDEX movr.public.promo_codes@promo_codes_idx_europe_west CONFIGURE ZONE USING
| num_replicas = 3,
| constraints = '{+region=europe-west1: 1}',
| lease_preferences = '[[+region=europe-west1]]'
PARTITION us_west OF INDEX movr.public.user_promo_codes@primary | ALTER PARTITION us_west OF INDEX movr.public.user_promo_codes@primary CONFIGURE ZONE USING
| constraints = '[+region=us-west1]'
PARTITION us_east OF INDEX movr.public.user_promo_codes@primary | ALTER PARTITION us_east OF INDEX movr.public.user_promo_codes@primary CONFIGURE ZONE USING
| constraints = '[+region=us-east1]'
PARTITION europe_west OF INDEX movr.public.user_promo_codes@primary | ALTER PARTITION europe_west OF INDEX movr.public.user_promo_codes@primary CONFIGURE ZONE USING
| constraints = '[+region=europe-west1]'
(34 rows)
View the default replication zone for the cluster
> SHOW ZONE CONFIGURATION FROM RANGE default;
target | raw_config_sql
----------------+-------------------------------------------
RANGE default | ALTER RANGE default CONFIGURE ZONE USING
| range_min_bytes = 134217728,
| range_max_bytes = 536870912,
| gc.ttlseconds = 90000,
| num_replicas = 3,
| constraints = '[]',
| lease_preferences = '[]'
(1 row)
View the replication zone for a database
To control replication for a specific database, use the ALTER DATABASE ... CONFIGURE ZONE statement to define the relevant values (other values will be inherited from the parent zone):
> ALTER DATABASE movr CONFIGURE ZONE USING num_replicas = 5, gc.ttlseconds = 100000;
CONFIGURE ZONE 1
> SHOW ZONE CONFIGURATION FROM DATABASE movr;
target | raw_config_sql
----------------+-------------------------------------------
DATABASE movr | ALTER DATABASE movr CONFIGURE ZONE USING
| range_min_bytes = 134217728,
| range_max_bytes = 536870912,
| gc.ttlseconds = 100000,
| num_replicas = 5,
| constraints = '[]',
| lease_preferences = '[]'
(1 row)
View the replication zone for a table
To control replication for a specific table, use the ALTER TABLE ... CONFIGURE ZONE statement to define the relevant values (other values will be inherited from the parent zone):
> ALTER TABLE users CONFIGURE ZONE USING num_replicas = 5, gc.ttlseconds = 100000;
CONFIGURE ZONE 1
> SHOW ZONE CONFIGURATION FROM TABLE users;
target | raw_config_sql
--------------+-----------------------------------------
TABLE users | ALTER TABLE users CONFIGURE ZONE USING
| range_min_bytes = 134217728,
| range_max_bytes = 536870912,
| gc.ttlseconds = 100000,
| num_replicas = 5,
| constraints = '[]',
| lease_preferences = '[]'
(1 row)
You can also use SHOW CREATE TABLE to view zone configurations for a table. If a table is partitioned, but no zones are configured, the SHOW CREATE TABLE output includes a warning.
View the replication zone for an index
To control replication for a specific index, use the ALTER INDEX ... CONFIGURE ZONE statement to define the relevant values (other values will be inherited from the parent zone):
> ALTER INDEX vehicles@vehicles_auto_index_fk_city_ref_users CONFIGURE ZONE USING num_replicas = 5, gc.ttlseconds = 100000;
CONFIGURE ZONE 1
> SHOW ZONE CONFIGURATION FROM INDEX vehicles@vehicles_auto_index_fk_city_ref_users;
target | raw_config_sql
-------------------------------------------------------+----------------------------------------------------------------------------------
INDEX vehicles@vehicles_auto_index_fk_city_ref_users | ALTER INDEX vehicles@vehicles_auto_index_fk_city_ref_users CONFIGURE ZONE USING
| range_min_bytes = 134217728,
| range_max_bytes = 536870912,
| gc.ttlseconds = 100000,
| num_replicas = 5,
| constraints = '[]',
| lease_preferences = '[]'
(1 row)
View the replication zone for a partition
Tip:
Most users should not need to use partitioning directly. Instead, they should use CockroachDB's built-in multi-region capabilities, which automatically handle geo-partitioning and other low-level details.
Once partitions have been defined for a table or a secondary index, to control replication for a partition, use ALTER PARTITION <partition> OF INDEX <table@index> CONFIGURE ZONE:
> ALTER PARTITION us_west OF INDEX vehicles@primary
CONFIGURE ZONE USING
num_replicas = 5,
constraints = '[+region=us-west1]';
CONFIGURE ZONE 1
> ALTER PARTITION us_west OF INDEX vehicles@vehicles_auto_index_fk_city_ref_users
CONFIGURE ZONE USING
num_replicas = 5,
constraints = '[+region=us-west1]';
CONFIGURE ZONE 1
To define replication zones for identically named partitions of a table and its secondary indexes, you can use the <table>@* syntax to save several steps:
> ALTER PARTITION us_west OF INDEX vehicles@*
CONFIGURE ZONE USING
num_replicas = 5,
constraints = '[+region=us-west1]';
To view the zone configuration for a partition, use SHOW ZONE CONFIGURATION FROM PARTITION <partition> OF INDEX <table@index>:
> SHOW ZONE CONFIGURATION FROM PARTITION us_west OF INDEX vehicles@primary;
target | raw_config_sql
----------------------------------------------+-------------------------------------------------------------------------
PARTITION us_west OF INDEX vehicles@primary | ALTER PARTITION us_west OF INDEX vehicles@primary CONFIGURE ZONE USING
| range_min_bytes = 134217728,
| range_max_bytes = 536870912,
| gc.ttlseconds = 90000,
| num_replicas = 5,
| constraints = '[+region=us-west1]',
| lease_preferences = '[]'
(1 row)
Tip:
You can also use the SHOW CREATE TABLE statement or SHOW PARTITIONS statements to view details about all of the replication zones defined for the partitions of a table and its secondary indexes.
See also
- Replication Controls
ALTER DATABASE ... CONFIGURE ZONEALTER INDEX ... CONFIGURE ZONEALTER RANGE ... CONFIGURE ZONEALTER TABLE ... CONFIGURE ZONE- SQL Statements
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