sql_select_limit

Description

sql_select_limit specifies the maximum number of rows that a SELECT query can return. If a SELECT query contains a LIMIT clause, the value of the LIMIT clause has a higher priority than sql_select_limit. By default, the number of rows returned by a SELECT query is not limited.

Privilege requirements

• Query variables

  • Global level

    The sys tenant and all user tenants can execute the SHOW VARIABLES statement or query the information_schema.GLOBAL_VARIABLES view (MySQL mode) to view the value of a global system variable.

  • Session level

    The sys tenant and all user tenants can execute the SHOW VARIABLES statement or query the information_schema.SESSION_VARIABLES view (MySQL mode) to view the value of a session system variable.

• Modify variables

  • Global level

    • The sys tenant can directly modify the value of a global system variable.

    • A MySQL user tenant must have the SUPER or ALTER SYSTEM privilege to modify the value of a global system variable.

  • Session level

    The sys tenant and all user tenants can directly modify the value of a session system variable.

Attributes

Examples

Specify the maximum number of rows that a SELECT query can return as 100.

• Session level

  obclient> SET sql_select_limit= 100;
  

• Global level

  obclient> SET GLOBAL sql_select_limit= 100;