MySQL 8.0 Reference Manual Including MySQL NDB Cluster 8.0
These views summarize the information in the
INFORMATION_SCHEMA
INNODB_BUFFER_PAGE table, grouped
by schema. By default, rows are sorted by descending buffer
size.
Querying views that access the
INNODB_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.
The
innodb_buffer_stats_by_schema
and
x$innodb_buffer_stats_by_schema
views have these columns:
object_schema
The schema name for the object, or InnoDB
System if the table belongs to the
InnoDB storage engine.
allocated
The total number of bytes allocated for the schema.
data
The total number of data bytes allocated for the schema.
pages
The total number of pages allocated for the schema.
pages_hashed
The total number of hashed pages allocated for the schema.
pages_old
The total number of old pages allocated for the schema.
rows_cached
The total number of cached rows for the schema.