Documentation Home
MySQL 5.5 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 27.2Mb
PDF (A4) - 27.2Mb
PDF (RPM) - 25.8Mb
HTML Download (TGZ) - 6.5Mb
HTML Download (Zip) - 6.6Mb
HTML Download (RPM) - 5.6Mb
Man Pages (TGZ) - 158.5Kb
Man Pages (Zip) - 262.1Kb
Info (Gzip) - 2.6Mb
Info (Zip) - 2.6Mb
Excerpts from this Manual

MySQL 5.5 Reference Manual  /  INFORMATION_SCHEMA Tables  /  INFORMATION_SCHEMA Thread Pool Tables

21.31 INFORMATION_SCHEMA Thread Pool Tables

The following sections describe the INFORMATION_SCHEMA tables associated with the thread pool plugin (see Section 5.5.3, “MySQL Enterprise Thread Pool”). They provide information about thread pool operation:

Rows in these tables represent snapshots in time. In the case of TP_THREAD_STATE, all rows for a thread group comprise a snapshot in time. Thus, the MySQL server holds the mutex of the thread group while producing the snapshot. But it does not hold mutexes on all thread groups at the same time, to prevent a statement against TP_THREAD_STATE from blocking the entire MySQL server.

The thread pool INFORMATION_SCHEMA tables are implemented by individual plugins and the decision whether to load one can be made independently of the others (see Section 5.5.3.2, “Thread Pool Installation”). However, the content of all the tables depends on the thread pool plugin being enabled. If a table plugin is enabled but the thread pool plugin is not, the table becomes visible and can be accessed but will be empty.


User Comments
User comments in this section are, as the name implies, provided by MySQL users. The MySQL documentation team is not responsible for, nor do they endorse, any of the information provided here.
Sign Up Login You must be logged in to post a comment.