WL#7800: PERFORMANCE SCHEMA, SETUP_ACTORS ENABLED COLUMN
Affects: Server-5.7 — Status: Complete — Priority: Medium
Performance_schema.setup_actors table is used to specify for which user/host connection thread (foreground thread), instrumentation is supposed to be turned ON. At present, if an entry for a user/host is found in setup_actors table, instrumentation would be turned ON for that connection (foreground thread). If no matching row for a user/host is found in setup_actors table, instrumentation for that user/host connection thread is turned OFF. (keep in mind that %, if specified, matches to all permissible user/host names). Therefore, there is no (easy) way to specify the exclusion of a specific user/host connection thread using setup_actors table. i.e. one can not say enable all user/host except this one. To allow this, a new column ENABLED is to be added in setup_actors table to make user capable of specifying exclusion as well. By default, instrumentation for all foreground threads from all user/host is Enabled. Note: Internal (background) threads are unaffected i.e. Enabled.
TABLE performance_schema.SETUP_ACTORS ====================================== Add the following column after the ROLE column: `ENABLED` enum('YES','NO') NOT NULL Operations ---------- The ENABLED column can be updated. A user must have the proper privileges to perform these operations. NOTE: Update on ENABLED column doesn't affect the existing foreground threads from same user/host. Semantic ======== See the existing documentation for 5.7: http://dev.mysql.com/doc/refman/5.7/en/setup-actors-table.html When the Performance Schema checks for a match in setup_actors, it tries to find more specific matches first. For example, with a user U1 and host H1, it looks for: 1. a match for 'U1' and 'H1'. 2. then for 'U1' and '%'. 3. then for '%' and 'H1'. 4. then for '%' and '%'. NOTE: ROLE is still not considered for search. With the added ENABLED column: - when the first match returns a row with ENABLED=YES, the instrumentation is turned ON for foreground threads (connection) from that user/host. - when the first match returns a row with ENABLED=NO, the instrumentation is turned OFF for foreground threads (connection) from that user/host. - when no match is found, the instrumentation is turned OFF for foreground threads (connection) from that user/host. Default setup ============= After the server completes the performance schema initialization, the table SETUP_ACTORS is populated with the following default rules: +------+------+------+---------+ | HOST | USER | ROLE | ENABLED | +------+------+------+---------+ | % | % | % | YES | +------+------+------+---------+ In other words, by default: - Every foreground thread (connection) is instrumented irrespective of user/host. Requirements ============ (1) Table performance_schema.setup_actors. ------------------------------------------- Func-Req (1.1): A fresh MySQL installation of CURRENT-VERSION must create the table performance_schema.setup_actors with the new ENABLED column. Func-Req (1.2): An upgrade from PREVIOUS-VERSION to CURRENT-VERSION must create the table performance_schema.setup_actors with the new ENABLED column. Func-Req (1.3): Security privileges for column setup_actors.ENABLED are enforced. This column can be updated, by users with the proper grants. Func-Req (1.4): Table performance_schema.setup_actors contains, by default, the following values: - HOST="%", USER="%", ROLE="%", ENABLED="YES",
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