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下載MySQL 8.0 Database Developer考試題庫
NEW QUESTION 25
Examine these commands which execute successfully in the sequence shown in Sessions S1 and S2:
Now, examine this statement that execute successfully in s1:
S1> SELECT * FROM emp;
Which is true about the result of the select statement?
- A. The inserted row is not returned because the transaction still active in s2.
- B. The inserted row is returned because the isolation level is RPEATABLE READ in S1.
- C. The inserted row is returned because the transaction is auto committed in S2.
- D. The inserted row is not returned because the isolation level is READ COMMITTED in S2.
Answer: A
NEW QUESTION 26
Examine these statements issued from Session 1 which execute successfully:
Now, examine these statements issued from Session 2 which execute successfully:
Session 2>
BEGIN;
UPDATE band SET song=CONCAT ("Here Comes the ", song) WHERE song LIKE ' %Sun ; Which two are true?
- A. Session 1 takes a shared lock on all the rows in the band table.
- B. Session 2 does not start a transaction.
- C. Session 1 does not block Session 2.
- D. Statements in Session 2 are committed.
- E. Session 2 takes an exclusive lock on all the rows in the band table.
- F. Session 1 must commit before the update in Session 2 can complete.
Answer: D,F
NEW QUESTION 27
Examine these commands and output:
Which is true?
- A. A new view is created because the previous was dropped on execution of the drop table statement.
- B. Existing emp_vuL is dropped and a new emp_vu1 created with the new definition.
- C. It returns an error because the CREATE TABLE statement automatically recreated the view.
- D. It returns an error because the DROP TABLE statement did not drop the view.
Answer: D
NEW QUESTION 28
Examine the statement which executes successfully:
SET sql_mode=' NO_ENGINE_SUBSTITTJTION' ;
You try to create a table with a storage engine that is not available. What will happen?
- A. The server will create the table using the default storage engine.
- B. An error occurs and the create table statement fails.
- C. The server will create the table but it will be unusable until the specified storage engine is available.
- D. The server will create the table but report an error when the first attempt to insert a row is performed.
Answer: B
NEW QUESTION 29
Examine these MySQL Shell statements:
What is the true about the attempts to add document to the collection?
- A. First three documents are added, then different number of fields cause an error.
- B. First two documents are added, then mismatched field names cause an error.
- C. All documents are added and cause a warning.
- D. All documents are added without any error or warning.
- E. First two documents are added, then mismatched field names cause a warning.
Answer: C
NEW QUESTION 30
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