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28.2.2 Database File I/O Graphs and Reports

This section describes the Database File I/O reports and graphs.

Note

This report requires sys schema be installed on the selected MySQL instance. If sys is not installed, and the selected instance is compatible, you are prompted to install it.

Each tab contains the following common elements:

  • Show n Entries: Number of entries to show per page.

  • Search: search the contents of the page.

  • Show/Hide Columns: enables you to change the column set displayed on the page by selecting or deselecting the columns.

  • Page Navigation: buttons enabling you to navigate the pages of the report.

I/O By File

Shows the top global I/O consumers by latency, and by file. The data is retrieved from sys.x$io_global_by_file_by_latency, and sorted by total latency by default.

For more information on the data retrieved in this report, see The io_global_by_file_by_latency and x$io_global_by_file_by_latency Views.

Figure 28.2 Database File I/O By File

Example of the Database File I/O By File report.

I/O By Wait Type

Shows the top global I/O consumers by latency. The data is retrieved from sys.x$io_global_by_wait_by_latency, and sorted by total latency, by default.

This report is a combination of report and graphs. The graphs can be redrawn based on a time range. To change the time range, select one of the range buttons. Values range from 1 hour to 1 week.

For more information on the data retrieved in this report, see The io_global_by_wait_by_latency and x$io_global_by_wait_by_latency Views.

Figure 28.3 Database File I/O By Wait Type Report

Example of the Database File I/O By Wait Type report.

The following shows a subset of the graphs available on the I/O By Wait Type tab:

Figure 28.4 Database File I/O By Wait Type Graphs

Example of the Database File I/O By Wait Type graphs.

I/O By Thread

Shows the top I/O consumers by thread, ordered by total latency. The data is retrieved from sys.x$io_by_thread_by_latency, and sorted by latency, by default.

For more information on the data retrieved in this report, see The io_by_thread_by_latency and x$io_by_thread_by_latency Views.

Figure 28.5 Database File I/O By Thread

Example of the Database File I/O By Thread report.