By Dwaine R. Snow, Thomas Xuan Phan
Now, there is a definitive consultant to complicated DB2 UDB database management that still offers the entire intensity and perception you want to organize for the harsh new IBM examination. immediately from the DB2 specialists at IBM, this e-book deals systematic and authoritative insurance of each examination target and may function a reference once you have handed the test.For the 1st time, this ebook brings jointly IBM most sensible practices, recommendations, guidance, directions, and ideas of thumb for almost each point of complex 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 handling 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 area or desk point disastersEffective tracking and challenge determinationMaximizing functionality and scalability
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Extra resources for Advanced DBA Certification Guide and Reference for DB2 UDB v8 for Linux, Unix and Windows
The process of rebalancing involves the moving of table space extents from one container to another in an attempt to keep the data striped evenly within the table space. Adding containers to a table space and any potential rebalance operation is an online, asynchronous operation, but it will impact the overall performance of the server. As a graphical example of this, consider a table space initially defined with two containers, as follows: CREATE TABLESPACE ts1 MANAGED BY DATABASE USING (FILE 'FILE1' 50) USING (FILE 'FILE2' 50) EXTENTSIZE 10 This table space would be graphically represented as follows: 42 43 Adding a third container of the same size to the table space using the following statement: ALTER TABLESPACE ts1 ADD (FILE 'FILE3' 50) may cause the table space to be rebalanced, depending on the amount of data in the table space.
EXTEND: Used to increase the size of existing containers within a table space by a specified amount. This can be applied to a specific container or to all containers, using the ALL CONTAINERS clause. REDUCE: Used to reduce the size of existing containers within a table space by a specified amount. This can be applied to a specific container or to all containers, using the ALL CONTAINERS clause. 41 42 RESIZE: Used to change the size of existing containers to the specified size. This can be applied to a specific container or to all containers, using the ALL CONTAINERS clause.
DROP cannot be used with EXTEND or ADD in the same statement, unless they are being directed to different database partitions. Adding Containers to a Table Space When a container is added to a table space, the existing data typically will need to be rebalanced among the new set of containers unless the BEGIN NEW STRIPE SET option is specified. The process of rebalancing involves the moving of table space extents from one container to another in an attempt to keep the data striped evenly within the table space.