Steps in SQL Query Execution (MySQL) 1. Client Sends Query to Server The SQL statement is sent to the MySQL server over a connection (e.g., via JDBC or a query tool like MySQL Workbench). 2. Parser / Syntax Check The parser checks the SQL syntax.If there are any syntax errors, it throws an error immediately. 3. Pre-processor Verifies privileges and permissions for the user executing the query. Resolves object names (like table or column aliases). 4. Query Optimization The optimizer evaluates multiple strategies to execute the query. It considers: Which indexes to use. Join order (for multi-table queries). Whether to use temporary tables. Cost of different execution paths. The optimizer chooses select the most efficient query plan (Cost effective -> memory, CPU etc). 5. Query Execution Plan (Most cost effective query plan) The query plan is a blueprint of how MySQL will fetch the data. You can view this with the EXPLAIN keyword in front of your query. 6. Query Execution The storage e...
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