PLACEMENT_RULES
The PLACEMENT_RULES table provides information on all explicitly configured Placement Rules in SQL. The information includes both placement policies and directly attached rules.
USE information_schema;
DESC placement_rules;
+----------------------+--------------+------+------+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------------------+--------------+------+------+---------+-------+
| POLICY_ID | bigint(64) | NO | | NULL | |
| CATALOG_NAME | varchar(512) | NO | | NULL | |
| POLICY_NAME | varchar(5) | YES | | NULL | |
| SCHEMA_NAME | varchar(5) | YES | | NULL | |
| TABLE_NAME | varchar(5) | YES | | NULL | |
| PARTITION_NAME | varchar(5) | YES | | NULL | |
| PRIMARY_REGION | varchar(5) | NO | | NULL | |
| REGIONS | varchar(5) | NO | | NULL | |
| CONSTRAINTS | varchar(5) | NO | | NULL | |
| LEADER_CONSTRAINTS | varchar(5) | NO | | NULL | |
| FOLLOWER_CONSTRAINTS | varchar(5) | NO | | NULL | |
| LEARNER_CONSTRAINTS | varchar(5) | NO | | NULL | |
| SCHEDULE | varchar(20) | NO | | NULL | |
| FOLLOWERS | bigint(64) | NO | | NULL | |
| LEARNERS | bigint(64) | NO | | NULL | |
+----------------------+--------------+------+------+---------+-------+
15 rows in set (0.00 sec)
Examples
The PLACEMENT_RULES table only shows explicitly configured rules. To see the canonical version of placement rules (including placement policies attached to tables), use the statement SHOW PLACEMENT instead:
CREATE TABLE t1 (a INT);
CREATE TABLE t2 (a INT) primary_region="us-east-1" regions="us-east-1";
CREATE PLACEMENT POLICY p1 primary_region="us-east-1" regions="us-east-1";
CREATE TABLE t3 (a INT) PLACEMENT POLICY=p1;
SHOW PLACEMENT; -- Includes t3.
SELECT * FROM information_schema.placement_rules; -- Does not include t3.
Query OK, 0 rows affected (0.09 sec)
Query OK, 0 rows affected (0.11 sec)
Query OK, 0 rows affected (0.08 sec)
Query OK, 0 rows affected (0.11 sec)
+---------------+------------------------------------------------+
| Target | Placement |
+---------------+------------------------------------------------+
| POLICY p1 | PRIMARY_REGION="us-east-1" REGIONS="us-east-1" |
| TABLE test.t2 | PRIMARY_REGION="us-east-1" REGIONS="us-east-1" |
| TABLE test.t3 | PRIMARY_REGION="us-east-1" REGIONS="us-east-1" |
+---------------+------------------------------------------------+
3 rows in set (0.00 sec)
+-----------+--------------+-------------+-------------+------------+----------------+----------------+-----------+-------------+--------------------+----------------------+---------------------+----------+-----------+----------+
| POLICY_ID | CATALOG_NAME | POLICY_NAME | SCHEMA_NAME | TABLE_NAME | PARTITION_NAME | PRIMARY_REGION | REGIONS | CONSTRAINTS | LEADER_CONSTRAINTS | FOLLOWER_CONSTRAINTS | LEARNER_CONSTRAINTS | SCHEDULE | FOLLOWERS | LEARNERS |
+-----------+--------------+-------------+-------------+------------+----------------+----------------+-----------+-------------+--------------------+----------------------+---------------------+----------+-----------+----------+
| 3 | def | p1 | NULL | NULL | NULL | us-east-1 | us-east-1 | | | | | | 0 | 0 |
| NULL | def | NULL | test | t2 | NULL | us-east-1 | us-east-1 | | | | | | 0 | 0 |
+-----------+--------------+-------------+-------------+------------+----------------+----------------+-----------+-------------+--------------------+----------------------+---------------------+----------+-----------+----------+
2 rows in set (0.00 sec)