Documentation Home
MySQL 5.7 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 39.4Mb
PDF (A4) - 39.4Mb
PDF (RPM) - 38.7Mb
HTML Download (TGZ) - 11.1Mb
HTML Download (Zip) - 11.1Mb
HTML Download (RPM) - 9.8Mb
Man Pages (TGZ) - 214.1Kb
Man Pages (Zip) - 323.2Kb
Info (Gzip) - 3.6Mb
Info (Zip) - 3.6Mb
Excerpts from this Manual

MySQL 5.7 Reference Manual  /  ...  /  The user_summary_by_file_io and x$user_summary_by_file_io Views The user_summary_by_file_io and x$user_summary_by_file_io Views

These views summarize file I/O, grouped by user. By default, rows are sorted by descending total file I/O latency.

The user_summary_by_file_io and x$user_summary_by_file_io views have these columns:

  • user

    The client user name. Rows for which the USER column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background.

  • ios

    The total number of file I/O events for the user.

  • io_latency

    The total wait time of timed file I/O events for the user.

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.