1 The syntax of the SQL statement is verified.

SQL的語法檢查

2 The data dictionary is searched to verify table and column definitions.

從數(shù)據(jù)字典檢查表名和字段名

3 The data dictionary is searched to verify security privileges on relevant objects.

從數(shù)據(jù)字典中檢查權(quán)限

4 Parse locks are acquired on the relevant objects.

解析相關(guān)對象的鎖

5 The optimal execution plan is determined.

選在執(zhí)行計劃運行SQL

6 The statement is loaded into the shared SQL area (also known as the library cache) in the shared pool of the system global area (SGA).

執(zhí)行后SQL語句放在SGA的SQL共享區(qū)

總結(jié)

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