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- Caching_sha2_password? MySQL_Native_Password?? ? ???? ?? ??? ????. ?? Caching_sha2_password? SHA-256 ??? ????? ???? ? ??? ??? ???? ?? MySQL_Native_password? ??? SHA-1 ????? ?????. ??, Caching_sha2_password? ?? ?? ??? ???? ??? ??? ??? ????? ?? MySQL_Native_password?? ??? ????. ?????, mysql_native_password? ? ?? ???? ??? ??? ?? ???? ??? ?? C
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- MySQL ???? 100% CPU ??? ?? ???? ??? ??????
- MySQL? CPU? 100%? ???? ???? ???? ?? ??, ??? ??, ?? ??? ?? ??? ?? ? ?? ??? ?????. 1. ?? showprocesslist? ???? ?? ?? ? ??? ?? ??? ??????. 2. ?? ?? ?? ?? ??? ??? ????? ?????. 3. ?? ??? ? ??? ???? ?? create_tmp_tables ? sort_merge_pass? ?????. 4. ??? ???? SQL ?? ??? ???? ?? ??? ?? ? ?? ??? ???????. 5. ?? ?, ?? ?? ???? ? ??? ??? ?? ?? ??? ??????. ?? ??? ?? ??? ??? ??? ?? ?? ??? ??? ? ? ????.
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- ? ???? ???? ?? ???? ??? ???? ???? ?? MySQL?? CreateUser ?? ???? ???? ??? ?? Grant ?? ?? ?? ? ?? FlushPrivileges Refresh ??? ??????. PostgreSQL?? ?? CreateUser? ???? ???? ?? ? ?? GrantSelect ? InsertOntable ?? ?? ??? ?????. 1. ??? ?? : MySQL ??? CreateUser'New_user '@'host'IndifiedBy'Password '; PostgreSQL? CreateUse???
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- MySQL ?? ?? my.cnf (?? my.ini)? ??? ?????
- MySQL ?? ??? ????? /etc/my.cnf ?? /etc/mysql/my.cnf? linux? ?? ?? ??? ???? ????. MySQL ??? ?? ?? ??? ??? ? ????-help | grep "defaultoptions"?? mySQL ???; ?? ??? ?? ?? ???? ???? ???? ???? ?? ?? ? ????? ??? ? ????.
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- MySQL ???? ?? 10, 5? ??? ??????
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- max_connections ?? ??? ? ?? ???? ?? ?? ? ?????
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- MySQL?? ? ??? ??? ??? ??????
- MySQL? Semi-synchronousreplication? ??? ??? ???? ????? ????? ??? ??? ??? ??? ????. 1. ????? ???? ??? ??? ??? ??? ???? ???? ???? ???? ??? ??? ???. 2. ?? ???? ??? ??? ????? ???? ??????? ????? ?????. 3. ?? ??? ????? ??? ??? ??? ???? ?? ???? ??? ??? ?????. 4.? ??? ?????? ??? ? ???? ??? ????? ???? ?? ?? ??? ???????. 5. ??? ??? ???? ? ??? ??? ???? ????? ?? ?? ? ???? ?? ?? ??? ???? ????. ? ?? ??? ?? ??? ???? ??? ????? ????? ?? ??? ?? ?? ??? ?? ? ??? ????? ?????.
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- ICP (Index Condition Pushdown) ? ??????
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