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SQL
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2 The data dictionary is searched to ver
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从数据字典检查表名和字段名
3 The data dictionary is searched to ver
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从数据字典中检查权限
4 Parse locks are acquired on the relevant objects.
解析相关对象
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5 The optimal execution plan is determined.
选在执行计划运行SQL
6 The statement is loaded
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执行后SQL语句放在SGA
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