Documentation Home
MySQL 5.5 Reference Manual
Related Documentation Download this Manual Excerpts from this Manual

MySQL 5.5 Reference Manual  /  ...  /  Naming Instruments or Consumers for Filtering Operations

22.2.3.4 Naming Instruments or Consumers for Filtering Operations

Names given for filtering operations can be as specific or general as required. To indicate a single instrument or consumer, specify its name in full:

mysql> UPDATE setup_instruments
    -> SET ENABLED = 'NO'
    -> WHERE NAME = 'wait/synch/mutex/myisammrg/MYRG_INFO::mutex';

mysql> UPDATE setup_consumers
    -> SET ENABLED = 'NO' WHERE NAME = 'file_summary_by_instance';

To specify a group of instruments or consumers, use a pattern that matches the group members:

mysql> UPDATE setup_instruments
    -> SET ENABLED = 'NO'
    -> WHERE NAME LIKE 'wait/synch/mutex/%';

mysql> UPDATE setup_consumers
    -> SET ENABLED = 'NO' WHERE NAME LIKE '%history%';

If you use a pattern, it should be chosen so that it matches all the items of interest and no others. For example, to select all file I/O instruments, it is better to use a pattern that includes the entire instrument name prefix:

... WHERE NAME LIKE 'wait/io/file/%';

A pattern of '%/file/%' will match other instruments that have a component of '/file/' anywhere in the name. Even less suitable is the pattern '%file%' because it will match instruments with 'file' anywhere in the name, such as wait/synch/mutex/sql/LOCK_des_key_file.

To check which instrument or consumer names a pattern matches, perform a simple test:

mysql> SELECT NAME FROM setup_instruments WHERE NAME LIKE 'pattern';

mysql> SELECT NAME FROM setup_consumers WHERE NAME LIKE 'pattern';

For information about the types of names that are supported, see Section 22.4, “Performance Schema Instrument Naming Conventions”.


User Comments
Sign Up Login You must be logged in to post a comment.