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#
# This grammar is suitable for general stress testing of storage engines
# including the InnoDB plugin and Falcon, their locking and transactional mechanisms. It can
# also be used along with the Combinations facility in order to provide stress testing under
# various configurations
#
# The goal is to spend as much time as possible inside the storage engine and as little time
# as possible in the optimizer. Therefore, most of the queries have trivial optimizer plans
# and run very quickly.
#
# At the same time, please note that this grammar does not aim to cover all possible
# table access methods. The grammars from conf/optimizer* are more suitable for that.
#
query:
transaction |
select | select | select |
select | select | select |
insert_replace | update | delete ;
transaction:
START TRANSACTION |
COMMIT | ROLLBACK |
SELECT SLEEP( zero_one ) |
SAVEPOINT A | ROLLBACK TO SAVEPOINT A |
SET AUTOCOMMIT=OFF | SET AUTOCOMMIT=ON |
SET TRANSACTION ISOLATION LEVEL isolation_level;
isolation_level:
READ UNCOMMITTED | READ COMMITTED | REPEATABLE READ | SERIALIZABLE ;
select:
SELECT select_list FROM join_list where LIMIT large_digit for_update_lock_in_share_mode;
select_list:
X . _field_key | X . _field_key |
X . `pk` |
X . _field |
* |
( subselect );
subselect:
SELECT _field_key FROM _table WHERE `pk` = value ;
# Use index for all joins
join_list:
_table AS X |
_table AS X LEFT JOIN _table AS Y USING ( _field_key );
for_update_lock_in_share_mode:
| | | | |
# FOR UPDATE | # bug 46539
LOCK IN SHARE MODE ;
# Insert more than we delete
insert_replace:
i_r ignore INTO _table (`pk`) VALUES (NULL) |
i_r ignore INTO _table ( _field_no_pk , _field_no_pk ) VALUES ( value , value ) , ( value , value ) ;
#|
# i_r ignore INTO _table ( _field_no_pk ) SELECT X . _field_key FROM join_list where order_by LIMIT large_digit; # bug46650
i_r:
INSERT | REPLACE ;
ignore:
;
# IGNORE # bug 46539
update:
UPDATE ignore _table AS X SET _field_no_pk = value where LIMIT large_digit ;
# We use a smaller limit on DELETE so that we delete less than we insert
delete:
DELETE FROM _table where_delete order_by_delete LIMIT small_digit ;
order_by:
| ORDER BY X . _field_key ;
order_by_delete:
| ORDER BY _field_key ;
# Use an index at all times
where:
WHERE X . _field_key < value | # Use only < to reduce deadlocks
WHERE X . _field_key IN ( value , value , value ) |
WHERE X . _field_key BETWEEN small_digit AND large_digit ;
# |
# WHERE X . _field_key = ( subselect ) ;
where_delete:
|
WHERE _field_key = value |
WHERE _field_key IN ( value , value , value ) |
WHERE _field_key IN ( subselect ) |
WHERE _field_key BETWEEN small_digit AND large_digit ;
large_digit:
5 | 6 | 7 | 8 ;
small_digit:
1 | 2 | 3 | 4 ;
value:
_digit | _tinyint_unsigned | _varchar(1);
zero_one:
0 | 0 | 1;
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