你可能感興趣的試題

The database instance has the following parameter setting：
OS_AUTHENT_PREFIX = OPS$ OS_ROLES = FALSE REMOTE_OS_AUTHENT = FALSE
REMOTE_OS_ROLES = FALSE TIMED_OS_STATISTICS = 0 You have a local operating system user SKD.You create a database user OPS$SKD， and then assign external authentication. The user OPS$SKD has theCREATE SESSION privilege.
What would you achieve by the above process（）

A.The database user OPS$SKD will be able to administer the database.
B.The authentication detail for the database user OPS$SKD is recorded in the password file.
C.The local operating system user SKD will be able to access the database instance without specifying theusername and password.
D.The database user OPS$SKD has to login with the password of the local operating system user SKD toaccess the database instance.

單項選擇題

Why does performance degrade when many UPDATE， INSERT， or DELETE statements are issued on a tablethat has an associated Bitmap index（）

A.The DML operations re-create the Bitmap index blocks.
B.The Bitmap index is rebuilt automatically after a DML operation.
C.The smallest amount of a bitmap that can be locked is a bitmap segment.
D.Additional time is taken to remove NULL values from the Bitmap index after a DML operation.

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你可能感興趣的試題

Why does performance degrade when many UPDATE， INSERT， or DELETE statements are issued on a tablethat has an associated Bitmap index（）

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Why does performance degrade when many UPDATE， INSERT， or DELETE statements are issued on a tablethat has an associated Bitmap index（）