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MySQL 5.7 Reference Manual  / ...  / MySQL sys Schema  / sys Schema Object Reference  / sys Schema Views  /  The innodb_buffer_stats_by_table and x$innodb_buffer_stats_by_table Views

26.4.3.8 The innodb_buffer_stats_by_table and x$innodb_buffer_stats_by_tableViews

These views summarize the information in theINFORMATION_SCHEMAINNODB_BUFFER_PAGE table, grouped by schema and table. By default, rows are sorted by descending buffer size.

Warning

Querying views that access theINNODB_BUFFER_PAGE table can affect performance. Do not query these views on a production system unless you are aware of the performance impact and have determined it to be acceptable. To avoid impacting performance on a production system, reproduce the issue you want to investigate and query buffer pool statistics on a test instance.

Theinnodb_buffer_stats_by_table andx$innodb_buffer_stats_by_table views have these columns:

  • object_schema

    The schema name for the object, orInnoDB System if the table belongs to theInnoDB storage engine.

  • object_name

    The table name.

  • allocated

    The total number of bytes allocated for the table.

  • data

    The number of data bytes allocated for the table.

  • pages

    The total number of pages allocated for the table.

  • pages_hashed

    The number of hashed pages allocated for the table.

  • pages_old

    The number of old pages allocated for the table.

  • rows_cached

    The number of cached rows for the table.