パーティション

PARTITIONSテーブルは、分割されたテーブルに関する情報を提供します。

USE INFORMATION_SCHEMA; DESC partitions;

出力は次のとおりです。

+-------------------------------+--------------+------+------+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------------------------------+--------------+------+------+---------+-------+ | TABLE_CATALOG | varchar(512) | YES | | NULL | | | TABLE_SCHEMA | varchar(64) | YES | | NULL | | | TABLE_NAME | varchar(64) | YES | | NULL | | | PARTITION_NAME | varchar(64) | YES | | NULL | | | SUBPARTITION_NAME | varchar(64) | YES | | NULL | | | PARTITION_ORDINAL_POSITION | bigint(21) | YES | | NULL | | | SUBPARTITION_ORDINAL_POSITION | bigint(21) | YES | | NULL | | | PARTITION_METHOD | varchar(18) | YES | | NULL | | | SUBPARTITION_METHOD | varchar(12) | YES | | NULL | | | PARTITION_EXPRESSION | longtext | YES | | NULL | | | SUBPARTITION_EXPRESSION | longtext | YES | | NULL | | | PARTITION_DESCRIPTION | longtext | YES | | NULL | | | TABLE_ROWS | bigint(21) | YES | | NULL | | | AVG_ROW_LENGTH | bigint(21) | YES | | NULL | | | DATA_LENGTH | bigint(21) | YES | | NULL | | | MAX_DATA_LENGTH | bigint(21) | YES | | NULL | | | INDEX_LENGTH | bigint(21) | YES | | NULL | | | DATA_FREE | bigint(21) | YES | | NULL | | | CREATE_TIME | datetime | YES | | NULL | | | UPDATE_TIME | datetime | YES | | NULL | | | CHECK_TIME | datetime | YES | | NULL | | | CHECKSUM | bigint(21) | YES | | NULL | | | PARTITION_COMMENT | varchar(80) | YES | | NULL | | | NODEGROUP | varchar(12) | YES | | NULL | | | TABLESPACE_NAME | varchar(64) | YES | | NULL | | | TIDB_PARTITION_ID | bigint(21) | YES | | NULL | | | TIDB_PLACEMENT_POLICY_NAME | varchar(64) | YES | | NULL | | +-------------------------------+--------------+------+------+---------+-------+ 27 rows in set (0.00 sec)
CREATE TABLE test.t1 (id INT NOT NULL PRIMARY KEY) PARTITION BY HASH (id) PARTITIONS 2; SELECT * FROM PARTITIONS WHERE table_schema='test' AND table_name='t1'\G

出力は次のとおりです。

*************************** 1. row *************************** TABLE_CATALOG: def TABLE_SCHEMA: test TABLE_NAME: t1 PARTITION_NAME: p0 SUBPARTITION_NAME: NULL PARTITION_ORDINAL_POSITION: 1 SUBPARTITION_ORDINAL_POSITION: NULL PARTITION_METHOD: HASH SUBPARTITION_METHOD: NULL PARTITION_EXPRESSION: `id` SUBPARTITION_EXPRESSION: NULL PARTITION_DESCRIPTION: TABLE_ROWS: 0 AVG_ROW_LENGTH: 0 DATA_LENGTH: 0 MAX_DATA_LENGTH: 0 INDEX_LENGTH: 0 DATA_FREE: 0 CREATE_TIME: 2022-12-14 06:09:33 UPDATE_TIME: NULL CHECK_TIME: NULL CHECKSUM: NULL PARTITION_COMMENT: NODEGROUP: NULL TABLESPACE_NAME: NULL TIDB_PARTITION_ID: 89 TIDB_PLACEMENT_POLICY_NAME: NULL *************************** 2. row *************************** TABLE_CATALOG: def TABLE_SCHEMA: test TABLE_NAME: t1 PARTITION_NAME: p1 SUBPARTITION_NAME: NULL PARTITION_ORDINAL_POSITION: 2 SUBPARTITION_ORDINAL_POSITION: NULL PARTITION_METHOD: HASH SUBPARTITION_METHOD: NULL PARTITION_EXPRESSION: `id` SUBPARTITION_EXPRESSION: NULL PARTITION_DESCRIPTION: TABLE_ROWS: 0 AVG_ROW_LENGTH: 0 DATA_LENGTH: 0 MAX_DATA_LENGTH: 0 INDEX_LENGTH: 0 DATA_FREE: 0 CREATE_TIME: 2022-12-14 06:09:33 UPDATE_TIME: NULL CHECK_TIME: NULL CHECKSUM: NULL PARTITION_COMMENT: NODEGROUP: NULL TABLESPACE_NAME: NULL TIDB_PARTITION_ID: 90 TIDB_PLACEMENT_POLICY_NAME: NULL 2 rows in set (0.00 sec)

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