You can increase the size of a DMS table space (that is,
one created with the MANAGED BY DATABASE clause) by adding one or
more containers to the table space.
About this task
No rebalancing occurs if you are adding new containers
and creating a new stripe set. A new stripe set is created using the
BEGIN NEW STRIPE SET clause on the ALTER TABLESPACE statement. You
can also add containers to existing stripe sets using the ADD TO STRIPE
SET clause on the ALTER TABLESPACE statement.
The addition
or modification of DMS containers (both file and raw device containers)
is performed in parallel through prefetchers. To achieve an increase
in parallelism of these create or resize container operations, you
can increase the number of prefetchers running in the system. The
only process which is not done in parallel is the logging of these
actions and, in the case of creating containers, the tagging of the containers.
Note: To
maximize the parallelism of the CREATE TABLESPACE or ALTER TABLESPACE
statements (with respect to adding new containers to an existing table
space) ensure that the number of prefetchers is greater than or equal
to the number of containers being added. The number of prefetchers
is controlled by the num_ioservers database configuration
parameter. The database must be stopped for the new parameter value
to take effect. In other words, all applications and users must disconnect
from the database for the change to take effect.
Important: Starting
with
Version 10.1 Fix
Pack 1, the DMS table space type is deprecated for user-defined permanent
table spaces and might be removed in a future release. The DMS table
space type is not deprecated for catalog and temporary table spaces.
For more information, see
DMS permanent table
spaces have been deprecated.
Example
The following example illustrates how to add two new device
containers (each with 10 000 pages) to a table space on a Linux or UNIX operating system:
ALTER TABLESPACE RESOURCE
ADD (DEVICE '/dev/rhd9' 10000,
DEVICE '/dev/rhd10' 10000)
Note that
the ALTER TABLESPACE statement allows you to change other properties
of the table space that can affect performance.
DB2 10.5 for Linux, UNIX, and Windows