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doc-exports/docs/ddm/umn/ddm_03_0032.html
Ru, Li Yi 4b09a03a51 ddm_umn 
Reviewed-by: Wagner, Fabian <fabian.wagner@t-systems.com>
Co-authored-by: Ru, Li Yi <liyiru7@huawei.com>
Co-committed-by: Ru, Li Yi <liyiru7@huawei.com>
2024-04-11 11:39:26 +00:00

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Database Management Syntax

Supported Database Management Syntax

  • SHOW Syntax
  • SHOW COLUMNS Syntax
  • SHOW CREATE TABLE Syntax
  • SHOW TABLE STATUS Syntax
  • SHOW TABLES Syntax
  • SHOW DATABASES

    If the required database is not found, check fine-grained permissions of your account.

  • SHOW INDEX FROM
  • SHOW VARIABLES Syntax

Supported Database Tool Commands

  • DESC Syntax
  • USE Syntax
  • EXPLAIN Syntax

    Unlike EXPLAIN in MySQL, the output of DDM EXPLAIN describes the nodes that the current SQL statement is routed to.

Unsupported Database Management Syntax

Table 1 Restrictions on database management statements

Item

Restriction

Database management statements
  • Executing SET Syntax to modify global variables is not supported.
  • SHOW TRIGGERS is not supported.

The following SHOW statements are randomly sent to a database shard. If database shards are on different RDS for MySQL instances, the returned variables or table information may be different.

  • SHOW TABLE STATUS
  • SHOW VARIABLES Syntax
  • CHECK TABLE does not support sharding tables by hash or sharding key.
  • SHOW WARNINGS Syntax does not support the combination of LIMIT and COUNT.
  • SHOW ERRORS Syntax does not support the combination of LIMIT and COUNT.
Parent topic: SQL Syntax