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SHOW STORAGE UNITS

Description

The SHOW STORAGE UNITS syntax is used to query the storage units that have been added to the specified database.

Syntax

ShowStorageUnit ::=
  'SHOW' 'STORAGE' 'UNITS' ('WHERE' 'USAGE_COUNT' '=' usageCount)? ('FROM' databaseName)?

usageCount ::=
  int

databaseName ::=
  identifier

Supplement

  • When databaseName is not specified, the default is the currently used DATABASE; if DATABASE is not used, it will prompt No database selected.

Return Value Description

Column Description
name Storage unit name
type Storage unit type
host Storage unit host
port Storage unit port
db Database name
attribute Storage unit attribute

Example

  • Query unused storage units for the specified database
SHOW STORAGE UNITS WHERE USAGE_COUNT = 0 FROM sharding_db;
mysql> SHOW STORAGE UNITS WHERE USAGE_COUNT = 0 FROM sharding_db;
+------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| name | type  | host      | port | db   | connection_timeout_milliseconds | idle_timeout_milliseconds | max_lifetime_milliseconds | max_pool_size | min_pool_size | read_only | other_attributes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
+------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ds_1 | MySQL | 127.0.0.1 | 3306 | db1  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"dataSourceProperties":{"maintainTimeStats":"false","rewriteBatchedStatements":"true","tinyInt1isBit":"false","cacheResultSetMetadata":"false","useServerPrepStmts":"true","netTimeoutForStreamingResults":"0","useSSL":"false","prepStmtCacheSqlLimit":"2048","elideSetAutoCommits":"true","cachePrepStmts":"true","serverTimezone":"UTC","zeroDateTimeBehavior":"round","prepStmtCacheSize":"8192","useLocalSessionState":"true","cacheServerConfiguration":"true"},"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
| ds_0 | MySQL | 127.0.0.1 | 3306 | db0  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"dataSourceProperties":{"maintainTimeStats":"false","rewriteBatchedStatements":"true","tinyInt1isBit":"false","cacheResultSetMetadata":"false","useServerPrepStmts":"true","netTimeoutForStreamingResults":"0","useSSL":"false","prepStmtCacheSqlLimit":"2048","elideSetAutoCommits":"true","cachePrepStmts":"true","serverTimezone":"UTC","zeroDateTimeBehavior":"round","prepStmtCacheSize":"8192","useLocalSessionState":"true","cacheServerConfiguration":"true"},"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
+------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
2 rows in set (0.03 sec)
  • Query unused storage units for current database
SHOW STORAGE UNITS WHERE USAGE_COUNT = 0;
mysql> SHOW STORAGE UNITS WHERE USAGE_COUNT=0;
+------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| name | type  | host      | port | db   | connection_timeout_milliseconds | idle_timeout_milliseconds | max_lifetime_milliseconds | max_pool_size | min_pool_size | read_only | other_attributes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
+------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ds_1 | MySQL | 127.0.0.1 | 3306 | db1  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"dataSourceProperties":{"maintainTimeStats":"false","rewriteBatchedStatements":"true","tinyInt1isBit":"false","cacheResultSetMetadata":"false","useServerPrepStmts":"true","netTimeoutForStreamingResults":"0","useSSL":"false","prepStmtCacheSqlLimit":"2048","elideSetAutoCommits":"true","cachePrepStmts":"true","serverTimezone":"UTC","zeroDateTimeBehavior":"round","prepStmtCacheSize":"8192","useLocalSessionState":"true","cacheServerConfiguration":"true"},"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
| ds_0 | MySQL | 127.0.0.1 | 3306 | db0  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"dataSourceProperties":{"maintainTimeStats":"false","rewriteBatchedStatements":"true","tinyInt1isBit":"false","cacheResultSetMetadata":"false","useServerPrepStmts":"true","netTimeoutForStreamingResults":"0","useSSL":"false","prepStmtCacheSqlLimit":"2048","elideSetAutoCommits":"true","cachePrepStmts":"true","serverTimezone":"UTC","zeroDateTimeBehavior":"round","prepStmtCacheSize":"8192","useLocalSessionState":"true","cacheServerConfiguration":"true"},"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
+------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
2 rows in set (0.01 sec)
  • Query storage units for the specified database
SHOW STORAGE UNITS FROM sharding_db;
mysql> SHOW STORAGE UNITS FROM sharding_db;
+------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| name | type  | host      | port | db   | connection_timeout_milliseconds | idle_timeout_milliseconds | max_lifetime_milliseconds | max_pool_size | min_pool_size | read_only | other_attributes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
+------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ds_1 | MySQL | 127.0.0.1 | 3306 | db1  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"dataSourceProperties":{"maintainTimeStats":"false","rewriteBatchedStatements":"true","tinyInt1isBit":"false","cacheResultSetMetadata":"false","useServerPrepStmts":"true","netTimeoutForStreamingResults":"0","useSSL":"false","prepStmtCacheSqlLimit":"2048","elideSetAutoCommits":"true","cachePrepStmts":"true","serverTimezone":"UTC","zeroDateTimeBehavior":"round","prepStmtCacheSize":"8192","useLocalSessionState":"true","cacheServerConfiguration":"true"},"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
| ds_0 | MySQL | 127.0.0.1 | 3306 | db0  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"dataSourceProperties":{"maintainTimeStats":"false","rewriteBatchedStatements":"true","tinyInt1isBit":"false","cacheResultSetMetadata":"false","useServerPrepStmts":"true","netTimeoutForStreamingResults":"0","useSSL":"false","prepStmtCacheSqlLimit":"2048","elideSetAutoCommits":"true","cachePrepStmts":"true","serverTimezone":"UTC","zeroDateTimeBehavior":"round","prepStmtCacheSize":"8192","useLocalSessionState":"true","cacheServerConfiguration":"true"},"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
+------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
2 rows in set (0.01 sec)
  • Query storage units for the current database
SHOW STORAGE UNITS;
mysql> SHOW STORAGE UNITS;
+------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| name | type  | host      | port | db   | connection_timeout_milliseconds | idle_timeout_milliseconds | max_lifetime_milliseconds | max_pool_size | min_pool_size | read_only | other_attributes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
+------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ds_1 | MySQL | 127.0.0.1 | 3306 | db1  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"dataSourceProperties":{"maintainTimeStats":"false","rewriteBatchedStatements":"true","tinyInt1isBit":"false","cacheResultSetMetadata":"false","useServerPrepStmts":"true","netTimeoutForStreamingResults":"0","useSSL":"false","prepStmtCacheSqlLimit":"2048","elideSetAutoCommits":"true","cachePrepStmts":"true","serverTimezone":"UTC","zeroDateTimeBehavior":"round","prepStmtCacheSize":"8192","useLocalSessionState":"true","cacheServerConfiguration":"true"},"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
| ds_0 | MySQL | 127.0.0.1 | 3306 | db0  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"dataSourceProperties":{"maintainTimeStats":"false","rewriteBatchedStatements":"true","tinyInt1isBit":"false","cacheResultSetMetadata":"false","useServerPrepStmts":"true","netTimeoutForStreamingResults":"0","useSSL":"false","prepStmtCacheSqlLimit":"2048","elideSetAutoCommits":"true","cachePrepStmts":"true","serverTimezone":"UTC","zeroDateTimeBehavior":"round","prepStmtCacheSize":"8192","useLocalSessionState":"true","cacheServerConfiguration":"true"},"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
+------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)

Reserved word

SHOW, STORAGE, UNIT, WHERE, USAGE_COUNT, FROM