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--source include/have_innodb.inc --source include/have_sequence.inc --source include/have_stat_tables.inc --source include/have_debug_sync.inc --source include/not_embedded.inc --echo # --echo # MDEV-7901: re-implement analyze table for low impact --echo # create table t1 (a int, b int, c int, key IDX1(a), key IDX2(a,b)) engine=innodb; insert into t1 select seq/10, seq/2, seq from seq_0_to_9; SET DEBUG_SYNC='statistics_collection_start1 SIGNAL analyzing WAIT_FOR written'; send analyze table t1 persistent for all; connect (con1, localhost, root,,); --connection con1 SET DEBUG_SYNC= 'now WAIT_FOR analyzing'; select count(*) from t1; # insert will work even with MyISAM because it allow to append file insert into t1 values (333,333,333); # but update now hang for MyISAM bacause can't get lock (InnoDB/XtraDB works) update t1 set a=1; SET DEBUG_SYNC= 'now SIGNAL written'; --connection default --reap select count(*) from t1; set debug_sync='RESET'; drop table t1;