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

Grammar Railroad diagram

  1. ShowStorageUnit ::=
  2.   'SHOW' 'STORAGE' 'UNITS' ('WHERE' 'USAGE_COUNT' '=' usageCount)? ('FROM' databaseName)?
  4. usageCount ::=
  5.   int
  7. databaseName ::=
  8.   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

ColumnDescription
nameStorage unit name
typeStorage unit type
hostStorage unit host
portStorage unit port
dbDatabase name
attributeStorage unit attribute

Example

  • Query unused storage units for the specified database
  1. SHOW STORAGE UNITS WHERE USAGE_COUNT = 0 FROM sharding_db;
  1. mysql> SHOW STORAGE UNITS WHERE USAGE_COUNT = 0 FROM sharding_db;
  2. +------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  3. | name | type  | host      | port | db   | connection_timeout_milliseconds | idle_timeout_milliseconds | max_lifetime_milliseconds | max_pool_size | min_pool_size | read_only | other_attributes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
  4. +------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  5. | ds_1 | MySQL | 127.0.0.1 | 3306 | db1  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
  6. | ds_0 | MySQL | 127.0.0.1 | 3306 | db0  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
  7. +------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  8. 2 rows in set (0.03 sec)
  • Query unused storage units for current database
  1. SHOW STORAGE UNITS WHERE USAGE_COUNT = 0;
  1. mysql> SHOW STORAGE UNITS WHERE USAGE_COUNT=0;
  2. +------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  3. | name | type  | host      | port | db   | connection_timeout_milliseconds | idle_timeout_milliseconds | max_lifetime_milliseconds | max_pool_size | min_pool_size | read_only | other_attributes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
  4. +------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  5. | ds_1 | MySQL | 127.0.0.1 | 3306 | db1  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
  6. | ds_0 | MySQL | 127.0.0.1 | 3306 | db0  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
  7. +------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  8. 2 rows in set (0.01 sec)
  • Query storage units for the specified database
  1. SHOW STORAGE UNITS FROM sharding_db;
  1. mysql> SHOW STORAGE UNITS FROM sharding_db;
  2. +------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  3. | name | type  | host      | port | db   | connection_timeout_milliseconds | idle_timeout_milliseconds | max_lifetime_milliseconds | max_pool_size | min_pool_size | read_only | other_attributes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
  4. +------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  5. | ds_1 | MySQL | 127.0.0.1 | 3306 | db1  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
  6. | ds_0 | MySQL | 127.0.0.1 | 3306 | db0  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
  7. +------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  8. 2 rows in set (0.01 sec)
  • Query storage units for the current database
  1. SHOW STORAGE UNITS;
  1. mysql> SHOW STORAGE UNITS;
  2. +------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  3. | name | type  | host      | port | db   | connection_timeout_milliseconds | idle_timeout_milliseconds | max_lifetime_milliseconds | max_pool_size | min_pool_size | read_only | other_attributes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
  4. +------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  5. | ds_1 | MySQL | 127.0.0.1 | 3306 | db1  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
  6. | ds_0 | MySQL | 127.0.0.1 | 3306 | db0  | 30000                           | 60000                     | 2100000                   | 50            | 1             | false     | {"healthCheckProperties":{},"initializationFailTimeout":1,"validationTimeout":5000,"leakDetectionThreshold":0,"registerMbeans":false,"allowPoolSuspension":false,"autoCommit":true,"isolateInternalQueries":false} |
  7. +------+-------+-----------+------+------+---------------------------------+---------------------------+---------------------------+---------------+---------------+-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  8. 2 rows in set (0.00 sec)

Reserved word

SHOW, STORAGE, UNIT, WHERE, USAGE_COUNT, FROM