MINI MINI MANI MO

show global variables like "innodb_sort_buffer_size";
Variable_name	Value
innodb_sort_buffer_size	66664
SET debug_sync = 'alter_table_update_log signal send_concurrent WAIT_FOR concurrent_done';
OPTIMIZE TABLE t1;;
SET debug_sync = 'now wait_for send_concurrent';
UPDATE t1 SET id = id + 1;
SET debug_sync = 'now signal concurrent_done';
Table	Op	Msg_type	Msg_text
test.t1	optimize	note	Table does not support optimize, doing recreate + analyze instead
test.t1	optimize	status	OK
DROP TABLE t1;