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-- Copyright (c) 2014, 2025, Oracle and/or its affiliates.
--
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation; version 2 of the License.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
--
-- View: innodb_buffer_stats_by_table
--
-- Summarizes the output of the INFORMATION_SCHEMA.INNODB_BUFFER_PAGE
-- table, aggregating by schema and table name
--
-- mysql> select * from innodb_buffer_stats_by_table;
-- +--------------------------+------------------------------------+------------+-----------+-------+--------------+-----------+-------------+
-- | object_schema | object_name | allocated | data | pages | pages_hashed | pages_old | rows_cached |
-- +--------------------------+------------------------------------+------------+-----------+-------+--------------+-----------+-------------+
-- | InnoDB System | SYS_COLUMNS | 128.00 KiB | 98.97 KiB | 8 | 8 | 8 | 1532 |
-- | InnoDB System | SYS_FOREIGN | 128.00 KiB | 55.48 KiB | 8 | 8 | 8 | 172 |
-- | InnoDB System | SYS_TABLES | 128.00 KiB | 56.18 KiB | 8 | 8 | 8 | 365 |
-- | InnoDB System | SYS_INDEXES | 112.00 KiB | 76.16 KiB | 7 | 7 | 7 | 1046 |
-- | mem30_trunk__instruments | agentlatencytime | 96.00 KiB | 28.83 KiB | 6 | 6 | 6 | 252 |
-- | mem30_trunk__instruments | binlogspaceusagedata | 96.00 KiB | 22.54 KiB | 6 | 6 | 6 | 196 |
-- | mem30_trunk__instruments | connectionsdata | 96.00 KiB | 36.68 KiB | 6 | 6 | 6 | 276 |
-- ...
-- +--------------------------+------------------------------------+------------+-----------+-------+--------------+-----------+-------------+
--
CREATE OR REPLACE
ALGORITHM = TEMPTABLE
DEFINER = 'mysql.sys'@'localhost'
SQL SECURITY INVOKER
VIEW innodb_buffer_stats_by_table (
object_schema,
object_name,
allocated,
data,
pages,
pages_hashed,
pages_old,
rows_cached
) AS
SELECT IF(LOCATE('.', ibp.table_name) = 0, 'InnoDB System', REPLACE(SUBSTRING_INDEX(ibp.table_name, '.', 1), '`', '')) AS object_schema,
REPLACE(SUBSTRING_INDEX(ibp.table_name, '.', -1), '`', '') AS object_name,
format_bytes(SUM(IF(ibp.compressed_size = 0, 16384, compressed_size))) AS allocated,
format_bytes(SUM(ibp.data_size)) AS data,
COUNT(ibp.page_number) AS pages,
COUNT(IF(ibp.is_hashed = 'YES', 1, NULL)) AS pages_hashed,
COUNT(IF(ibp.is_old = 'YES', 1, NULL)) AS pages_old,
ROUND(SUM(ibp.number_records)/COUNT(DISTINCT ibp.index_name)) AS rows_cached
FROM information_schema.innodb_buffer_page ibp
WHERE table_name IS NOT NULL
GROUP BY object_schema, object_name
ORDER BY SUM(IF(ibp.compressed_size = 0, 16384, compressed_size)) DESC;
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