| Server IP : 88.99.149.37 / Your IP : 216.73.216.141 Web Server : nginx/1.31.2 System : Linux server-88-99-149-37 6.12.0-124.56.5.el10_1.x86_64 #1 SMP PREEMPT_DYNAMIC Fri May 15 06:12:08 EDT 2026 x86_64 User : muralimurth ( 1015) PHP Version : 8.4.23 Disable Function : exec,system,passthru,shell_exec,proc_close,proc_open,dl,popen,show_source,posix_kill,posix_mkfifo,posix_getpwuid,posix_setpgid,posix_setsid,posix_setuid,posix_setgid,posix_seteuid,posix_setegid,posix_uname MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : OFF | Sudo : ON | Pkexec : ON Directory : /usr/local/mysql/mysql-test/main/ |
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# # Bug #725050: print keyuse info when hash join is used # create table t1 (a int, b int); insert into t1 values (2,2), (1,1); create table t2 (a int); insert into t2 values (2), (3); set session join_cache_level=3; SET @saved_dbug = @@SESSION.debug_dbug; set @@debug_dbug= 'd,opt'; explain select t1.b from t1,t2 where t1.b=t2.a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where 1 SIMPLE t2 hash_ALL NULL #hash#$hj 5 test.t1.b 2 Using where; Using join buffer (flat, BNLH join) select t1.b from t1,t2 where t1.b=t2.a; b 2 set session join_cache_level=default; drop table t1,t2; SET debug_dbug= @saved_dbug;