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MySQL 5.6 Reference Manual
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22.9.2.4 The setup_objects Table

The setup_objects table controls whether the Performance Schema monitors particular objects. This table has a maximum size of 100 rows by default. To change the table size, modify the performance_schema_setup_objects_size system variable at server startup.

The initial setup_objects contents look like this:

mysql> SELECT * FROM setup_objects;
+-------------+--------------------+-------------+---------+-------+
| OBJECT_TYPE | OBJECT_SCHEMA      | OBJECT_NAME | ENABLED | TIMED |
+-------------+--------------------+-------------+---------+-------+
| TABLE       | mysql              | %           | NO      | NO    |
| TABLE       | performance_schema | %           | NO      | NO    |
| TABLE       | information_schema | %           | NO      | NO    |
| TABLE       | %                  | %           | YES     | YES   |
+-------------+--------------------+-------------+---------+-------+

Modifications to the setup_objects table affect object monitoring immediately.

For object types listed in setup_objects, the Performance Schema uses the table to how to monitor them. Object matching is based on the OBJECT_SCHEMA and OBJECT_NAME columns. Objects for which there is no match are not monitored.

The effect of the default object configuration is to instrument all tables except those in the mysql, INFORMATION_SCHEMA, and performance_schema databases. (Tables in the INFORMATION_SCHEMA database are not instrumented regardless of the contents of setup_objects; the row for information_schema.% simply makes this default explicit.)

When the Performance Schema checks for a match in setup_objects, it tries to find more specific matches first. For example, with a table db1.t1, it looks for a match for 'db1' and 't1', then for 'db1' and '%', then for '%' and '%'. The order in which matching occurs matters because different matching setup_objects rows can have different ENABLED and TIMED values.

Rows can be inserted into or deleted from setup_objects by users with the INSERT or DELETE privilege on the table. For existing rows, only the ENABLED and TIMED columns can be modified, by users with the UPDATE privilege on the table.

For more information about the role of the setup_objects table in event filtering, see Section 22.2.3.3, “Event Pre-Filtering”.

The setup_objects table has these columns:

  • OBJECT_TYPE

    The type of object to instrument. This is always 'TABLE' (base table).

    TABLE filtering affects table I/O events (wait/io/table/sql/handler instrument) and table lock events (wait/lock/table/sql/handler instrument).

  • OBJECT_SCHEMA

    The schema that contains the object. This should be a literal name, or '%' to mean any schema.

  • OBJECT_NAME

    The name of the instrumented object. This should be a literal name, or '%' to mean any object.

  • ENABLED

    Whether events for the object are instrumented. The value is YES or NO. This column can be modified.

    This column was added in MySQL 5.6.3. For earlier versions in which it is not present, the Performance Schema enables monitoring only for objects matched by some row in the table; monitoring is implicitly disabled for nonmatching objects.

  • TIMED

    Whether events for the object are timed. This column can be modified.


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