The SHOW STORAGE UNITS syntax is used to query the storage units that have been added to the specified database.
ShowStorageUnit ::=
'SHOW' 'STORAGE' 'UNITS' ('WHERE' 'USAGE_COUNT' '=' usageCount)? ('FROM' databaseName)?
usageCount ::=
int
databaseName ::=
identifier
databaseName is not specified, the default is the currently used DATABASE; if DATABASE is not used, it will prompt No database selected.| 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 |
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)
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)
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)
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)
SHOW, STORAGE, UNIT, WHERE, USAGE_COUNT, FROM