By Dwaine R. Snow, Thomas Xuan Phan
Now, there is a definitive advisor to complex DB2 UDB database management that still can provide all of the intensity and perception you want to arrange for the cruel new IBM examination. immediately from the DB2 specialists at IBM, this booklet bargains systematic and authoritative insurance of each examination goal and may function a reference once you have handed the test.For the 1st time, this publication brings jointly IBM top practices, recommendations, assistance, guidance, 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 firm environmentRapid restoration within the occasion of desk area or desk point disastersEffective tracking and challenge determinationMaximizing functionality and scalability
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10 illustrates the example above and shows the high water mark for the table space. As shown, Extents 3 and 4 are empty because the table (T1) was dropped and its extents freed up to be reused within the table space. However, the extents for table T2 still occupy Extents 5 and 6, so the high water mark is page 70. 10. The table space high water mark. 47 48 Lowering the table space high water mark If there are no unused extents below the current high water mark for a table space, the high water mark cannot be lowered without dropping one or more objects stored in the table space.
48 49 The dropping of existing table space containers is only allowed if the number of extents in the container(s) being dropped is less than or equal to the number of free extents above the high water mark in the table space. The number of free extents above the high water mark in the table space is important because all extents up to and including the high water mark must be able to fit in the same logical position within the table space. The altered table space must have enough space to hold all of the data.
30 ♦ Container name ♦ Container ID ♦ Container type ♦ Total pages in the container ♦ Number of useable pages in the container ♦ Stripe set number ♦ An indicator of whether the container is accessible • The table space map for DMS table spaces An example of the output of the GET SNAPSHOT FOR TABLESPACES command for an SMS table space is below. 0 An example of the output of the GET SNAPSHOT FOR TABLESPACES command for a DMS table space is below. Tablespace name Tablespace ID Tablespace Type Tablespace Content Type Tablespace Page size (bytes) Tablespace Extent size (pages) Tablespace Prefetch size (pages) Buffer pool ID currently in use Buffer pool ID next startup Tablespace State Detailed explanation: 30 = = = = = = = = = = TS1 3 Database managed space Any data 4096 32 16 1 1 0x'00000000' 31 Normal Total number of pages Number of usable pages Number of used pages Number of pending free pages Number of free pages High water mark (pages) Rebalancer Mode Minimum Recovery Time Number of quiescers Number of containers Container Name Container ID Container Type Total Pages in Container Usable Pages in Container Stripe Set Container is accessible = = = = = = = = = = = = = = = = = Table space map: Range Stripe Stripe Number Set Offset [ 0] [ 0] 0 Max Start End Adj.
Advanced DBA Certification Guide and Reference for DB2 UDB v8 for Linux, Unix and Windows by Dwaine R. Snow, Thomas Xuan Phan