-- Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. -- -- 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: schema_tables_with_full_table_scans -- -- Find tables that are being accessed by full table scans -- ordering by the number of rows scanned descending. -- -- mysql> select * from schema_tables_with_full_table_scans limit 5; -- +--------------------+--------------------------------+-------------------+-----------+ -- | object_schema | object_name | rows_full_scanned | latency | -- +--------------------+--------------------------------+-------------------+-----------+ -- | mem30__instruments | fsstatistics | 10207042 | 13.10 s | -- | mem30__instruments | preparedstatementapidata | 436428 | 973.27 ms | -- | mem30__instruments | mysqlprocessactivity | 411702 | 282.07 ms | -- | mem30__instruments | querycachequeriesincachedata | 374011 | 767.15 ms | -- | mem30__instruments | rowaccessesdata | 322321 | 1.55 s | -- +--------------------+--------------------------------+-------------------+-----------+ -- CREATE OR REPLACE ALGORITHM = MERGE DEFINER = 'root'@'localhost' SQL SECURITY INVOKER VIEW schema_tables_with_full_table_scans ( object_schema, object_name, rows_full_scanned, latency ) AS SELECT object_schema, object_name, count_read AS rows_full_scanned, sys.format_time(sum_timer_wait) AS latency FROM performance_schema.table_io_waits_summary_by_index_usage WHERE index_name IS NULL AND count_read > 0 ORDER BY count_read DESC;