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单选题
Two database users, Jack and Bill, are accessing the SupportCenter STAFF table of the SupportCenter DB database. When Jack modifies a value in the table, the new value is invisible to Bill. Which is the modified value invisible to Bill?（）
A
The modified data are not available on disk.
B
The modified data have been flushed out from memory.
C
The modified rows of the SupportCenter STAFF table have been locked.
D
Jack has not committed the changes after modifying the value.
E
Both users are accessing the database from two different machines.
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更多 “单选题Two database users, Jack and Bill, are accessing the SupportCenter STAFF table of the SupportCenter DB database. When Jack modifies a value in the table, the new value is invisible to Bill. Which is the modified value invisible to Bill?（）A The modified data are not available on disk.B The modified data have been flushed out from memory.C The modified rows of the SupportCenter STAFF table have been locked.D Jack has not committed the changes after modifying the value.E Both users are accessing the database from two different machines.” 相关考题
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The modified data are not available on disk.B
The modified data have been flushed out from memory.C
The modified rows of the SupportCenter STAFF table have been locked.D
Jack has not committed the changes after modifying the value.E
Both users are accessing the database from two different machines.
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Create an INSERT trigger to assign the default value to each item in the table. B
Create a CHECK constraint to validate the data and to assign the default value to each item in the table. C
Create an UPDATE trigger to update the default value for each new item in the table. D
Create a DEFAULT constraint to assign the default value specifying the WITH VALUES argument.
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Define the new column as NULL.Update the FriendlyName column to the same value as the productName column. Alter the FriendlyName column to be NOT NULL.B
Define the new column as NOT NULL with a default value of ’Undefined.’C
Define the new column as NULL. Use application logic to enforce the data constraint.D
Define the new column as NULL with a default value of ’Undefined.’
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Modify the value for the UTL_FILE_DIR parameter in the parameter fileB
Grant read and write privilege on the operating system path to the database usersC
Modify the value for the LDAP_DIRECTORY_ACCESS parameter in the parameter fileD
Modify the value for the PLSQL_NATIVE_LIBRARY_DIR parameter in the parameter fileE
Create a directory object referring to the operating system path， and grant read and write privilege on the directory object to the database users
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Set DYNAMIC_SAMPLING to level 4B
Set the STATISTICS_LEVEL parameter to BASICC
Set the INCREMENTAL value to TRUE for the partition tableD
Increase the value of STALE_PERCENT for the partition table
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单选题You are planning to import customer data from the Customer table and the Country table in your SQL Server 2000 database into a SQL Server 2005 database. You want to ensure that during the import process，each value in the CountryCode column of the Customer table has a corresponding record in the CountryCode column in the Country table of the SQL Server 2005 database. You define a foreign key between these two tables. Thus，referential integrity will guarantee that the import routine fails if there are any records where a CountryCode value does not exist in the Country table but does exist in the Customer table. You need to ensure that the import process does not fail if records are encountered that do not exist in the Country table. What should you do？（）A
Drop the foreign key. Import the data by using the script. Re-create the foreign key.B
Create a CHECK constraint.C
Create a DML INSTEAD OF trigger that writes the failed records to a file or table.D
Create a DML AFTER trigger that writes the failed records to a file or table.
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