runtime_bloom_filter_max_size

Description

runtime_bloom_filter_max_size specifies the maximum memory usage of a runtime Bloom filter, in bytes.

Privilege requirements

• Query variables

  • Global level

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

• Modify variables

  • Global level

    • The sys tenant can 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.

    • An Oracle user tenant must have the ALTER SYSTEM privilege to modify the value of a global system variable.

  • Session level

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

Attributes

Examples

Set the maximum memory usage of a runtime Bloom filter to 2 GB.

• Session level

  obclient> SET runtime_bloom_filter_max_size = 2 * 1024 * 1024 * 1024;
  

• Global level

  obclient> SET GLOBAL runtime_bloom_filter_max_size = 20 * 1024 * 1024;