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I have migrated a large MS SQL Server database to MySQL. I have noticed that query execution for complicated queries with multiple joins on MySQL takes considerably longer compared to SQL Server for the same query(125.063 sec vs 0.01 sec respectively). What could be causing this?
It may caused by non-optimized queries for new DBMS. Or maybe you chosen bad mysql engine for example. Also, you have to be sure that ALL your indexes, primary keys, foreign keys and other have been imported successfully.