SHOW STORAGE UNITS 语法用于查询指定逻辑库已经注册的存储单元。
ShowStorageUnit ::=
'SHOW' 'STORAGE' 'UNITS' ('WHERE' 'USAGE_COUNT' '=' usageCount)? ('FROM' databaseName)?
usageCount ::=
int
databaseName ::=
identifier
databaseName 时，默认是当前使用的 DATABASE； 如未使用 DATABASE 则会提示 No database selected。| 列 | 说明 |
|---|---|
| name | 存储单元名称 |
| type | 存储单元类型 |
| host | 存储单元地址 |
| port | 存储单元端口 |
| db | 数据库名称 |
| attribute | 存储单元参数 |
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、UNITS、WHERE、USAGE_COUNT、FROM