Getting Started with IBM Data Studio for DB2

114 Getting Started with IBM Data Studio for DB2
Figure 3.13 – Dropping a buffer pool
If you have associated any table space with this buffer pool, Data Studio will prompt you to
drop the impacted table space at the same time. The drop will fail unless you select the
option to drop the impacted table space. Alternatively, you can alter the corresponding
table space first to disassociate it from this buffer pool (you can associate it with the default
or some other buffer pool) and then try dropping this buffer pool again.
3.2.3 Reorganizing data
Normally, data is written to memory in a sequential manner. However, frequent operations
on the database objects can fragment the data, which may mean that data is stored nonsequentially
and can increase the size of the table as the data spans multiple data pages.
Fragmentation of the data may result in multiple I/O operations to fetch the same data that,
without fragmentation, would have taken only a single I/O operation. You should reorganize
the tables and indexes to defragment the data, improving the I/O cost and, in some
instances, reducing memory usage.
To reorganize data:
1. Open the Tables folder in the Administration Explorer and select a table from the
object list editor.
2. Open an editor to configure the reorganization operation by right-clicking the table
and selecting Manage -> Reorg Table. Figure 3.14 shows the Reorg options for the
ORDER_DETAILS table in the GOSALES schema.