-- Copyright (c) 2014, 2021, 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, version 2.0,
-- as published by the Free Software Foundation.
--
-- This program is also distributed with certain software (including
-- but not limited to OpenSSL) that is licensed under separate terms,
-- as designated in a particular file or component or in included license
-- documentation.  The authors of MySQL hereby grant you an additional
-- permission to link the program and your derivative works with the
-- separately licensed software that they have included with MySQL.
--
-- 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, version 2.0, 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,
       sys.format_bytes(SUM(IF(ibp.compressed_size = 0, 16384, compressed_size))) AS allocated,
       sys.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;
