By
Paul C. Zikopoulos and Roman B. Melnyk
The BEGIN NEW STRIPE SET Option
DB2 UDB Version 8.1 introduces the BEGIN NEW STRIPE SET
option on the ALTER TABLESPACE statement (Figure 4).
Figure 4. The BEGIN NEW STRIPE SET option on the
ALTER TABLESPACE statement allows you to add new containers to a DMS table
space without the need for rebalancing the containers.
The easiest way to do this is through the Control Center,
which gives you access to database objects, including table spaces. Figure 5
shows a DMS table space called TS1 that we created in the SAMPLE database. All
of the table spaces in the SAMPLE database appear in the contents pane with
Table Spaces selected in the object tree.
Figure 5. The table spaces that are associated with a
particular database appear in the contents pane of the Control Center with
Table Spaces selected in the object tree.
Clicking Alter in the pop-up menu launches the Alter Table
Space window (Figure 6).
Figure 6. The Containers tab of the Alter Table Space
window. Selecting the Manage stripe sets check box adds a Stripe Set column to
the window.
Clicking the Add button launches the Define Container window
(Figure 7). If the Manage stripe sets check box in the Alter Table Space window
was selected, you will see a Stripe set drop-down list in the Define Container
window, from which you can select a new (or existing) stripe set for the new
container.
Figure 7. The Define Container window lets you
specify a new container for a DMS table space. You can associate this new
container with an existing stripe set, or with a new one, which is equivalent
to specifying the BEGIN NEW STRIPE SET clause on the ALTER TABLESPACE
statement.
The following code shows the underlying SQL statements that
defined the new container TSC2 and stripe set 1:
db2 connect to sample
db2 alter tablespace ts1 begin new stripe set (file 'D:\WorkDir\tsc2' 5120)
db2 connect reset
If you were to add another container (TSC3, for example) to
the table space without specifying the BEGIN NEW STRIPE SET option, TSC3
would become part of the new stripe set (1). In addition, if you subsequently
added container TSC4, this time specifying the BEGIN NEW STRIPE SET option, a
new stripe set (2) would be created, and TSC4 would be part of stripe set 2.
You can add a container to an existing stripe set by
specifying the ADD option, along with the TO STRIPE SET clause, as follows:
db2 connect to sample
db2 alter tablespace ts1 add to stripe set 0 (file 'D:\WorkDir\tsc5' 512)
db2 connect reset
If you do not specify the TO STRIPE SET clause, the current
(that is, the most recently created) stripe set is assumed.
Conclusion
DB2 UDB Version 8.1 introduces the BEGIN NEW STRIPE SET
option on the ALTER TABLESPACE statement. This option allows you to add more
storage to DMS table spaces without the need for rebalancing containers.
About the Authors
Paul C. Zikopoulos, BA, MBA, is with IBM Canada
Ltd. Paul has written numerous magazine
articles and books about DB2. Paul has co-authored the books: DB2 Version 8:
The Official Guide, DB2: The Complete Reference, DB2 Fundamentals
Certification for Dummies, DB2 for Dummies, and A DBA's Guide to Databases
on Linux. Paul is a DB2 Certified Advanced Technical Expert (DRDA and
Cluster/EEE) and a DB2 Certified Solutions Expert (Business Intelligence
and Database Administration). You can reach him at: paulz_ibm at msn.com.
Roman B. Melnyk, PhD, is with IBM Canada Ltd.,
specializing in database administration, DB2
utilities, and SQL. Roman has written numerous DB2 books, articles, and
other related materials. Roman co-authored DB2 Version 8: The Official
Guide, DB2: The Complete Reference, DB2 Fundamentals Certification for
Dummies, and DB2 for Dummies. You can reach him at roman_b_melnyk at
hotmail.com.
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