多项选择题
A.It fails if any existing row violates the constraint.
B.It does not validate the existing data in the table.
C.It enables the constraint to be enforced at the end of each transaction.
D.It prevents insert， update， and delete operations on the table while the constraint is in the process of beingenabled
多项选择题 You executed the following command to create a tablespace called SALES_DATA： SQL> CREATE TABLESPACE sales_data DATAFILE SIZE 100M SEGMENT SPACE MANAGEMENT AUTO； Which two statements are true about the SALES_DATA tablespace（）
单项选择题 View the Exhibit and examine the user information. The user has been granted CONNECT and RESOURCEroles and no individual system privileges. The SL_REP user executes this command to create a table:SQL> CREATE TABLE orders(oid number(6), odate date, ccode number(4), oamt number(10,2))TABLESPACE purchase_space; The PURCHASE_SPACE tablespace already exists in the database. Which statement describes the effect ofthe command（）
单项选择题 YouaremanaginganOracleDatabase11gdatabase.Youwanttoensuretherecoveryofthedatabasetothepointoffailure.Whichconfigurationwillyoudotoaccomplishthetask（）