drop table if exists t0,t1;
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
explain select * from t0 where a < 3;
id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 ALL NULL NULL NULL NULL 10 Using where
#
# MDEV-5045: Server crashes in QPF_query::print_explain with log_slow_verbosity='query_plan,explain'
# set autocommit=1;
drop table t0;
#
# MDEV-5047 virtual THD::~THD(): Assertion `status_var.memory_used == 0' fails on disconnect
#
connect con1,localhost,root,,;
ALTER TABLE nonexisting ENABLE KEYS; ERROR42S02: Table 'test.nonexisting' doesn't exist
SHOW WARNINGS;
Level Code Message Error1146 Table 'test.nonexisting' doesn't exist
disconnect con1;
connection default;
SELECT 1; 1 1
#
# MDEV-5060 Server crashes on EXPLAIN EXTENDED or EXPLAIN PARTITIONS with explain in slow_log
#
EXPLAIN PARTITIONS SELECT 1;
id select_type table partitions type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
#
# MDEV-5106: Server crashes in Explain_union::print_explain on ER_TOO_BIG_SELECT with explain in slow log
#
CREATE TABLE t1 (i INT) ENGINE=MyISAM;
INSERT INTO t1 VALUES
(1),(2),(3),(4),(5),(6),(7),(8),(9),(10); SET max_join_size = 10;
( SELECT ta.* FROM t1 ta, t1 tb ) UNION ( SELECT * FROM t1 ); ERROR42000: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET MAX_JOIN_SIZE=# if the SELECT is okay
SELECT 'Server still alive?' as 'Yes';
Yes
Server still alive?
DROP TABLE t1;
#
# MDEV-5308 Crash when running with slow_query_log=1
# SET @save1= @@log_slow_rate_limit; SET @save2= @@long_query_time; SET log_slow_rate_limit=1000; SET long_query_time=0.000001;
SELECT 1; 1 1 SET log_slow_rate_limit=@save1; SET long_query_time=@save2;
create table t1 (a int);
execute immediate "select * from t1 join t1 t2 on (t1.a>5) where exists (select 1)";
a a
drop table t1;
Messung V0.5 in Prozent
¤ Dauer der Verarbeitung: 0.12 Sekunden
(vorverarbeitet am 2026-10-08)
¤
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.