By Dwaine R. Snow, Thomas Xuan Phan
Now, there is a definitive consultant to complex DB2 UDB database management that still promises all of the intensity and perception you must organize for the harsh new IBM examination. immediately from the DB2 specialists at IBM, this publication bargains systematic and authoritative assurance of each examination aim and may function a reference once you have handed the test.For the 1st time, this ebook brings jointly IBM top practices, innovations, information, instructions, and ideas of thumb for almost each element of complicated DB2 UDB v8 database administration-including all this and more:Ability to layout, create, and deal with desk spacesAbility to layout, create, and deal with buffer poolsWhen and the way to use parallelism in DB2 UDBConfiguring federated database accessDesigning and imposing a backup and restoration strategyAbility to enforce a standby databaseMonitoring and tuning DB2Using and coping with tables with multidimensional clusteringDesigning and configuring a number of database partitionsImplementing authentication and encryption on a wide scaleLeveraging parallelism and symmetric multiprocessingPreparing for and executing restoration in an company environmentRapid restoration within the occasion of desk house or desk point disastersEffective tracking and challenge determinationMaximizing functionality and scalability
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Additional resources for Advanced DBA Certification Guide and Reference for DB2 UDB v8 for Linux, Unix and Windows
Example text
The altered table space must have enough space to hold all of the data. Extending/Enlarging Containers in a Table Space Although an existing table space can be made larger by adding one or more containers, this may require a rebalance of the existing data. Another way to make the table space larger without adding containers is to make the existing containers larger. This can be done using the EXTEND or RESIZE options on the ALTER TABLESPACE statement. Extending a table space container increases the size of the container by the specified amount.
For performance reasons, when the location of an extent in the current table space map is the same as its location in the new table space map, the extent is not moved, and no I/O takes place. NOTE 54 55 The following examples show containers of different sizes within a table space for the purposes of illustration. For performance reasons, it is recommended that containers within a table space be the same size. Monitoring a Table Space Rebalance The table space snapshot has been enhanced with DB2 Version 8 to include information about any table space rebalancing that may be occurring.
Containers 0 0 3(0, 1, 2) 2(0, 1) NOTE The following examples show containers of different sizes within a table space for the purposes of illustration. For performance reasons it is recommended that containers within a table space be the same size. Using the table space created above, a container can be added in the following three ways. 38 39 Because the new container is not large enough to go from Stripe 0 to the end of the existing table space, it is added such that its last extent lines up with the highest stripe currently in the table space.