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Transcript
CISB314 DATABASE 2
LAB 2
LAB 2
Getting Started with DB2
In this lab, you will be introduced to instances, databases, DB2 commands and DB2 server
connection. This lab consists of five parts:




Initial Steps
Working with DB2 Databases
Creating SQL scripts
Handling Errors
1. Initial Steps
To complete this lab, you will need VMware image and VMware Player 2.x or VMware Player
Workstation or later.
a) To start the VMware image, double-click on VMware Player icon on the desktop.
b) Select Open a Virtual Machine. Browse through the D: drive, go to this path: DB2
Training\03_VMWare\DB2v97AA_20110520_new. Then, double click DB2 Express C
9.7 32-bit.
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c) Select DB2 Express-C 9.7 32-bit and click Play virtual machine button.
d) At the login prompt, login with following credentials:
Username: db2inst1
Password: password
e) Open the terminal window by right-clicking on the Desktop and choosing the Open
Terminal item.
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2. Working with DB2 Databases
a) To get started with DB2, ensure that the DB2 Database Manager has been started by
issuing following command at the prompt:
[email protected]:-> db2start
You should get:
SQL1063N DB2START processing was successful
Or
SQL1026N The database manager is already active
b) Throughout the lab, the SAMPLE database will be used to explore the features of DB2.
To create the SAMPLE database we need to first remove the existing SAMPLE database
by issuing the following command:
[email protected]:-> db2 drop db sample
You should get:
DB20000I The DROP DATABASE command completed successfully
c) To generate the SAMPLE database, issue this command:
[email protected]:-> db2sampl
This process will take some time, you should get the following:
Creating database “SAMPLE”…
Connecting to database “SAMPLE”…
Creating tables and data in schema “SAMPLE”…
Creating tables with XML columns and XML data in schema
“DB2INST1”…
‘db2sampl’ processing complete.
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d) Before working with a database, a user of application program must establish a
connection with that database. You connect to databases using the CONNECT statement.
There are SEVERAL WAYS you can connect to a database:
i.
If the database you want to connect is local, and you simply want to connect to it
using the default user ID, issue the command:
[email protected]:-> db2 connect to sample
You should get:
Database Connection Information
Database server
SQL authorization
Local database alias
ii.
= DB2/LINUX 9.7.4
= DB2INST1
= SAMPLE
OR you can also use following command:
[email protected]:->
db2
db2inst1 using password
iii.
connect
to
sample
user
OR you can also have DB2 prompt you for the password using following
command:
[email protected]:->
db2inst1
db2
connect
to
sample
user
e) Let’s take a look at the tablespaces that DB2 created by default when we issued the create
the SAMPLE database statement by issuing following command:
[email protected]:-> db2 list tablespaces
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You should get:
Table space SYSCATSPACE contains the System Catalog tables. It basically contains
system information that should not be modified or deleted; otherwise the database will
not work correctly.
Table space TEMPSPACE1 is used by DB2 when it needs additional space to perform
some operations such as sorts.
Table space USERSPACE1 is normally used to store user database tables if there is no
table space specified when creating a table.
f) Let’s try to view a table from the SAMPLE database. Issue following SQL statement:
[email protected]:-> db2 “select
* from department”
You should get:
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g) Next, create a table named tbl1 and insert values into it:
[email protected]:->
db2
“create
varchar(30), phone varchar(20))”
table
tbl1(name
[email protected]:->
db2
“insert
into
values(‘Tom’,’123456789’),(‘Mary’,’987654321’)”
tbl1
You should get a message saying:
DB20000I The SQL command completed successfully
for each statement.
h) Then, view the table:
[email protected]:-> db2 “select
* from tbl1”
You should get:
i) Because we do not need this table in SAMPLE database, remove table tbl1 using this
command:
[email protected]:-> db2 drop table tbl1
You should get a message saying:
DB20000I The SQL command completed successfully
j) Anytime that you need to terminate the connection to the database, you can issue the
TERMINATE command:
[email protected]:-> db2 terminate
You should get a message saying:
DB20000I The TERMINATE command completed successfully
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3. Creating SQL Scripts
You can also save all the SQL commands as a file in SQL Scripts.
a) To create the file, press the menu at the bottom left corner of the screen, and select More
Applications.
b) Scroll down and select gedit text editor, located under Tools.
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c) Type the following SQL commands in the text editor and save it as myscript1.db2:
Note: Put semicolon (;) to terminate each statement.
d) Then, issue following command at the prompt:
[email protected]:-> db2 –tvf myscript1.db2 –z
myscript1.log
You will get the same output as in Section 2g – 2j.
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e) The SQL commands in previous example use semicolon as statement terminator. If you
use different symbol, for example the exclamation mark (!), a different DB2 command
must be issued to run the file.
Locate and edit myscript1.db2 and put exclamation mark at the end of every statement:
The file is located at db2inst1’s Home folder on the Desktop.
Next, issue this command at the prompt:
[email protected]:-> db2 –td! –v -f myscript1.db2 –z
myscript1.log
You will get the same output as in Section 2g – 2j.
f) Delete myscript1.db2 and myscript1.log files from db2inst1’s Home folder as we no
longer need it.
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a) Terminate the connection to the database:
[email protected]:-> db2 terminate
b) To stop the DB2 Database Manager, issue:
[email protected]:-> db2stop
c) And issue the following to clean up the command window:
[email protected]:-> clear
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Try It Yourself: Practice DB2 Commands
1. Start the DB2 Database Manager.
2. Using command window:
a) Create a new database named DB101.
b) Establish a connection to the database.
c) Create a table named zipcodes that has three columns, as shown below:
Column
zip
city
state
Type
varchar(5)
varchar(30)
varchar(20)
d) Insert two records in the table.
Zip
City
State
59200 Bangsar Kuala Lumpur
43000 Kajang
Selangor
e) View the content of table zipcodes.
f) Remove table zipcodes from database DB101.
3. Using text editor:
a) Create a SQL script named db101script.db2.
b) Repeat Step 1c – 1f.
Use “#” as the statement terminator.
c) Run the script from DB2 Command Window.
4. Terminate connection to the database DB101.
5.
Remove it from the system directory.
6. View the content of the system directory to make sure DB101 is removed.
7. Stop DB2 Database Manager and clean up the command window.
8. Delete db101script.db2 and db101script.log files from db2inst1’s Home folder.
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