Fix bug #8677: if one used LOCK TABLES, created an InnoDB temp table, and did a multi-table update where a MyISAM table was the update table and the temp table was a read table, then InnoDB aserted in row0sel.c because n_mysql_tables_in_use was 0. Also, we remove the assertion altogether and just print an error to the .err log if this important consistency check fails. Then it is up to the user to read the .err log and notice the problem if there still are errors in MySQL's table locking.
Fix memory corruption bug reported by Georg Richter: if one created a table whose primary key contained at least 2 column prefixes, that could corrupt the memory heap of prebuilt_t
Add comments about why the InnoDB latching order is obeyed also for the MySQL query cache mutex; add an error printf if that is not the case
sync0sync.h:
Assign sync0sync.h ranks also for the MySQL query cache mutex and the MySQL binlog mutex; the latching order must be obeyed also for these
row0ins.c:
Add a comment why the query cache invalidate operation cannot deadlock in a cascaded FOREIGN KEY operation
Fix a little bug in InnoDB: we looked at the physical size of a stored SQL NULL value from a wrong field in the index; this has probably caused no bugs visible to the user, only caused some extra space usage in some rare cases; we may later backport the fix to 4.0
Fix the previous bug fix: dropping a table with FOREIGN KEY checks running on it caused a cascade of failed drops while the foreign key check was waiting for a lock
Fix bug: if we dropped a table where an INSERT was waiting for a lock to check a FOREIGN KEY constraint, then an assertion would fail in lock_reset_all_on_table(), since that operation assumes no waiting locks on the table or its records
row0mysql.c:
Fix bug: InnoDB failed to drop a table in the background drop queue if the table was referenced by a foreign key constraint
Fix InnoDB critical bug #7496; we scan the InnoDB data dictionary also at a normal mysqld startup, and create the spaces, so that we know the mapping space id -> .ibd file name; fix an infinite loop if DISCARD TABLESPACE coincides with INSERT or some other table operation; fix a potential crash if DISCARD TABLESPACE coincides with a cascaded FOREIGN KEY operation in the same table; do not allow DISCARD TABLESPACE of a referenced table if FOREIGN_KEY_CHECKS=1
Logging to logging@openlogging.org accepted
sql_yacc.yy, sql_parse.cc, sql_lex.h, lex.h:
Implements the SHOW MUTEX STATUS command
set_var.cc, mysqld.cc, mysql_priv.h:
Added new GLOBAL variable timed_mutexes
ha_innodb.h:
New function innodb_mutex_show_status
ha_innodb.cc:
Added new innodb variables in SHOW STATUS
Implements the SHOW MUTEX STATUS command
innodb.test, innodb.result:
Added new row_lock_waits status variables tests.
variables.test, variables.result:
test new variable timed_mutexes
ut0ut.c:
New function ut_usectime.
sync0sync.c:
Mutex counting.
sync0rw.c:
New mutex parameters initialization.
srv0srv.c:
Counting row lock waits
row0sel.c, row0mysql.c:
Setting row_lock or table_lock state to thd.
que0que.c:
Added default no_lock_state to thd.
univ.i:
Added UNIV_SRV_PRINT_LATCH_WAITS debug define
sync0sync.ic:
Count mutex using.
sync0sync.h:
Added new parameters to mutex structure for counting.
sync0rw.h:
Added new parameters to rw_create_func.
srv0srv.h:
Added new innodb varuables to SHOW STATUS.
que0que.h:
Added thread lock states.
