Getting Started with IBM Data Studio for DB2

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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.
Chapter 3 – Maintaining the database 115 Figure 3.14 – Reorganization options for tables A new editor opens. You use this editor to configure the reorganization operation. 3. Specify options for the reorganization operation. The editor is shown in Figure 3.15. Figure 3.15 – Options for reorganizing a table You can reorganize a table in two ways:
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3 Notices This information was deve
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Table of contents 5 Table of conten
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3.3.1 Exporting data...............
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Chapter 7 - Tuning queries ........
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11.4 Community and resources ......
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Preface 13 Keeping your skills curr
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around the world have participated
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17 About the authors Dimple Bhatia
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Contributors 19 The following peopl
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21 Acknowledgements The authors owe
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193 Chapter 6 - Managing jobs Job m
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213 Chapter 7 - Tuning queries In t
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237 Chapter 8 - Developing SQL stor
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355 Appendix D - The Sample Outdoor
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Appendix E - Advanced topics for de
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E.5.4 Data web services artifacts A
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References 391 References [1] HAYES
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References 393 Books and articles 1
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396 Getting started with IBM Data S
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