Lock을 사용하지 않는 이유는, 베타적 락(Exclusive Lock)으로 인해 다른 트랜잭션이 해당 데이터를 READ하기 위해 기다리는 상황이 발생하고, 이런 트랜잭션들이 증가한다면 성능 저하로...
Downgrade from MySQL 8.0 to MySQL 5.7, or from a MySQL 8.0 release to a previous MySQL 8.0 release, is not supported. The only supported alternative is to restore a backup taken before upgrading. It is therefore imperative that you back up your data before starting the upgrade process. ...
LOCATE 함수의 출력은 인수로 전달된 문자열의 발생이 있는 첫 번째 행입니다. 이 기능이 작동하는지 보려면 아래 코드를 살펴보십시오.-- finding the word 'Park' from the table where the last name of ...
max_connect_errors | 100 | | max_connections | 151 | | max_delayed_threads | 20 | | max_digest_length | 1024 | | max_error_count | 1024 | | max_execution_time | 0 | | max_heap_table_size | 16777216 | | max_insert_delayed_threads | 20 | | max_join_size | ...
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