Learning Visually with Examples [Electronic resources] نسخه متنی

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Learning Visually with Examples [Electronic resources] - نسخه متنی

Raul F. Chong, Clara Liu, Sylvia F. Qi, Dwaine R. Snow

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Chapter 4

A1:

The Task Center lets you schedule scripts containing SQL statements and/or DB2 commands to be run at specific times.

A2:

There is no equivalent DB2 tool in the Linux/UNIX platforms. The Linux/UNIX

shell would be equivalent to the DB2 Command Window.

A3:

The registry variable is DB2OPTIONS.

A4:

When you plan to copy a command or statement that has carriage returns and then paste it into the CLP, it is best to use this method.

A5:

The

terminate command.

A6:

You can invoke Visual Explain from the Command Editor. Type a query, and then choose either the

Execute and Access plan or Access Plan button.

A7:

The Development Center tool.

A8:

No. The Control Center can be used to administer DB2 for Linux, UNIX, and Windows databases as well as DB2 for OS/390 and z/OS databases.

A9:

The Journal keeps track of DB2 messages; therefore, review the Journal messages tab.

A10:

Access the Information Center from the Internet at A11:

B and

C . You can enter SQL statements and DB2 CLP commands in the Command Line Processor (CLP) or in the Command Editor.

A12:

B . The default termination character is a semi-colon (;).

A13:

E . By default the CLP has autocommit enabled, and this causes the CLP to issue a commit statement automatically after every statement. Therefore, in this case, the CLP will issue a commit four timesafter each entry in the input file.

A14:

C . The Health Center will alert you when actions in the database exceed thresholds for performance-related characteristics that you have defined.

A15:

B and

E . The Memory Visualizer will track the memory used by DB2 on your system and will plot/graph this memory usage for you automatically if you desire. The

db2mtrk tool is the command line interface to the same information, and it will provide the same information in a text-based report.

A16:

A . By default the CLP has autocommit enabled, which causes the CLP to issue a commit automatically after every statement. However, the

+c flag tells the CLP to disable autocommit; therefore, in this case, the CLP will not issue a commit. Since there is no explicit commit statement, there will be no commits during the processing of this file.

A17:

B . To set a termination character you need to use the

-TD option, and to set the input file you need to use the

-f option. However, if you specify a value for an option, you cannot string the options together. Therefore the correct answer is B.

A18:

C and D. db2 ? SQL-911 is not commonly used, but it works.

db2 ? SQL911N is most often used. Note that the

N after the 911 is optional.

A19:

D . Repeat is not a DB2 CLP command and can't be run in interactive mode.

A20:

C and

D are allowed from the CLP in interactive mode.

A is not allowed since you cannot prefix the command with

db2 when in interactive mode.

B is a DB2 system command, and it can only be executed from the Command Window or the Linux/UNIX shell.


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