97.Which statement is true about loading data using the conventional path of SQL*Loader?
2016-07-28 17:10
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97.Which statement is true about loading data using the conventional path of SQL*Loader?
A.Redo is not generated while performing conventional path loads.
B.Only PRIMARY KEY, UNIQUE KEY, and NOT NULL constraints are checked.
C.No exclusive locks are acquired when the conventional path loads are performed.
D.Instead of performing transactions, SQL*Loader directly writes data blocks to the data files.
E.INSERT triggers are disabled before the conventional path load and reenabled at the end of the load.
答案：C
解析:
参考：http://docs.oracle.com/cd/E11882_01/server.112/e22490/ldr_modes.htm#SUTIL1322
A：错误，文档里边有这么Minimizing Use of the Redo Log，说明肯定是产生redo的
B：错误，在倒入过程中，check和外键会禁用，其他正常，到导入完成后check和外键会启用
C：正确，Because each SQL*Loader session can attempt to reenable constraints on a table after a direct path load, there is a danger that one session may attempt to reenable a constraint before another session is finished loading data. In this case, the first session
to complete the load will be unable to enable the constraint because the remaining sessions possess share locks on the table.
D：错误，不可能直接写数据文件的
E：错误，文档中没有找到
A.Redo is not generated while performing conventional path loads.
B.Only PRIMARY KEY, UNIQUE KEY, and NOT NULL constraints are checked.
C.No exclusive locks are acquired when the conventional path loads are performed.
D.Instead of performing transactions, SQL*Loader directly writes data blocks to the data files.
E.INSERT triggers are disabled before the conventional path load and reenabled at the end of the load.
答案：C
解析:
参考：http://docs.oracle.com/cd/E11882_01/server.112/e22490/ldr_modes.htm#SUTIL1322
A：错误，文档里边有这么Minimizing Use of the Redo Log，说明肯定是产生redo的
B：错误，在倒入过程中，check和外键会禁用，其他正常，到导入完成后check和外键会启用
C：正确，Because each SQL*Loader session can attempt to reenable constraints on a table after a direct path load, there is a danger that one session may attempt to reenable a constraint before another session is finished loading data. In this case, the first session
to complete the load will be unable to enable the constraint because the remaining sessions possess share locks on the table.
D：错误，不可能直接写数据文件的
E：错误，文档中没有找到
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