【单选题】Two database users, Jack and Bill, are accessing the Certkiller STAFF table of the Certkiller DB database. When Jack modifies a value in the table, the new value is invisible to Bill. Which is the mo...
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 Certkiller 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.
【单选题】The database model that organizes information into tables of records that are connected to one another by linking a field in one table to a field in another table is called ________.
【单选题】Examine the following commands executed in your database: SQL> ALTER SESSION RECYCLEBIN=ON; Session altered SQL> CREATE TABLE emp TABLESPACE tbsfd AS SELECT * FROM hr.employees; Table created. Furt...
A.
The table is moved to the SYSAUX tablespace.
B.
The table is moved to the SYSTEM tablespace.
C.
The table is removed from the database permanently.
D.
The table is renamed and remains in the TBSFD tablespace.
【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 t...
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.