mirror of
https://github.com/MariaDB/server.git
synced 2025-07-11 22:08:15 +02:00
30 lines
771 B
PHP
30 lines
771 B
PHP
# include/execute_with_statistics.inc
|
|
#
|
|
# SUMMARY
|
|
#
|
|
# Explain and execute the select statement in $query.
|
|
# Then report 'Last_query_cost' estimate from the query
|
|
# optimizer and total number of 'Handler_read%' when the
|
|
# query was executed.
|
|
# Intended usage is to verify that there are no regressions
|
|
# in either calculated or actual cost for $query.
|
|
#
|
|
# USAGE
|
|
#
|
|
# let $query= <select statement>;
|
|
# --source include/execute_with_statistics.inc
|
|
#
|
|
# EXAMPLE
|
|
# t/greedy_optimizer.test
|
|
#
|
|
|
|
eval EXPLAIN $query;
|
|
SHOW STATUS LIKE 'Last_query_cost';
|
|
|
|
FLUSH STATUS;
|
|
eval $query;
|
|
--disable_warnings
|
|
SELECT SUM(variable_value) AS Total_handler_reads
|
|
FROM information_schema.session_status
|
|
WHERE variable_name LIKE 'Handler_read%';
|
|
--enable_warnings
|