innodb_buffer_stats_by_table and x$innodb_buffer_stats_by_table Sys Schema Views
MariaDB starting with 10.6
These Sys Schema views were introduced in MariaDB 10.6.
Querying these views can have a noticeable performance impact on a production server.
Description
The innodb_buffer_stats_by_table
and x$innodb_buffer_stats_by_table
views summarize information from the Information Schema INNODB_BUFFER_PAGE table, grouped by schema and table. Rows are sorted by descending buffer size by default.
The innodb_buffer_stats_by_table
view is intended to be easier for human reading, while the x$innodb_buffer_stats_by_table
view provides the data in raw form, intended for tools that process the data.
They contain the following columns:
Column | Description |
---|---|
object_schema | Object schema name, or InnoDB System if the table belongs to the InnoDB storage engine. |
object_name | Table name. |
allocated | Total number of bytes allocated for the table. |
data | Number of data bytes allocated for the table. |
pages | Total number of pages allocated for the table. |
pages_hashed | Total number of hashed pages allocated for the table. |
pages_old | Total number of old pages allocated for the table. |
rows_cached | Total number of cached rows for the table. |
Example
SELECT * FROM sys.innodb_buffer_stats_by_table\G *************************** 1. row *************************** object_schema: mysql object_name: transaction_registry allocated: 64.00 KiB data: 0 bytes pages: 4 pages_hashed: 4 pages_old: 4 rows_cached: 0 *************************** 2. row *************************** object_schema: InnoDB System object_name: SYS_FOREIGN allocated: 48.00 KiB data: 0 bytes pages: 3 pages_hashed: 3 pages_old: 3 rows_cached: 0 *************************** 3. row *************************** object_schema: InnoDB System object_name: SYS_TABLES allocated: 32.00 KiB data: 1.07 KiB pages: 2 pages_hashed: 2 pages_old: 2 rows_cached: 10 ... SELECT * FROM sys.x$innodb_buffer_stats_by_table\G *************************** 1. row *************************** object_schema: mysql object_name: transaction_registry allocated: 65536 data: 0 pages: 4 pages_hashed: 0 pages_old: 0 rows_cached: 0 *************************** 2. row *************************** object_schema: InnoDB System object_name: SYS_FOREIGN allocated: 49152 data: 0 pages: 3 pages_hashed: 0 pages_old: 0 rows_cached: 0 *************************** 3. row *************************** object_schema: InnoDB System object_name: SYS_TABLES allocated: 32768 data: 1100 pages: 2 pages_hashed: 0 pages_old: 0 rows_cached: 10 ....
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