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Setting a isolation level of the transaction to read committed

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weakens the locks for this session similarly like the option
innodb_locks_unsafe_for_binlog. This patch removes almost all
gap locking (used in next-key locking) and makes MySQL to release
the row locks on the rows which does not belong to result set.
Additionally, nonlocking selects on INSERT INTO SELECT,
UPDATE ... (SELECT ...), and CREATE ... SELECT ... use a
nonlocking consistent read. If a binlog is used, then binlog
format should be set to row based binloging to make the execution
of the complex SQL statements.
This commit is contained in:
jan
2006-03-27 05:33:30 +00:00
parent f58fa91cdc
commit 1bd22ab327
12 changed files with 1346 additions and 65 deletions
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3
include/row0mysql.h
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@@ -244,7 +244,8 @@ row_update_for_mysql(
row_prebuilt_t* prebuilt); /* in: prebuilt struct in MySQL
handle */
/*************************************************************************
This can only be used when srv_locks_unsafe_for_binlog is TRUE. Before
This can only be used when srv_locks_unsafe_for_binlog is TRUE or
session is using a READ COMMITTED isolation level. Before
calling this function we must use trx_reset_new_rec_lock_info() and
trx_register_new_rec_lock() to store the information which new record locks
really were set. This function removes a newly set lock under prebuilt->pcur,