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Siebel Installation Guide for Microsoft Windows: Servers, Mobile Web Clients, Tools > Configuring the RDBMS > Configuring IBM DB2 UDB for Siebel Applications >
Guidelines for Setting DB2 UDB Database Manager Configuration Parameters
You can set the database configuration parameters using the update database manager configuration command of the DB2 Command Line Processor or using the DB2 Control Center. For more information on modifying these configuration parameters, see the IBM DB2 UDB technical documentation. Table 5 describes DB2 UDB database manager configuration parameters that differ from the default settings. Set these parameters for each DB2 UDB instance. Use the configuration information in Table 5 for the listed parameters. For parameters not listed in this table, accept the default settings.
Table 5. DB2 UDB Database Manager Configuration Parameters
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SHEAPTHRES
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Sort heap threshold (4 KB) |
200000
Deployments with 3,000 or more concurrent users and using over 5 GB of RAM can increase this to 300000. |
DIR_CACHE
|
Directory cache support |
YES
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ASLHEAPSZ
|
Application support layer heap size |
15
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RQRIOBLK
|
Maximum requester I/O block size (bytes) |
65535
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MON_HEAP_SZ
|
Database monitor heap size (4 KB) |
128 (minimum)
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QUERY_HEAP_SZ
|
Query heap size (4 KB) |
16384
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KEEPFENCED
|
Keep Fenced process |
YES
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MAXAGENTS
|
Maximum number existing agents |
20000 (minimum)
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NUM_INITAGENTS
|
Initial number agents in pool |
10
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NUM_POOLAGENTS
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Number of agents in the agent pool kept active at all times |
80
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MAX_COORDAGENTS
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Maximum number coordinating agents |
MAXAGENTS
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INDEXREC
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Index re-creation time |
RESTART
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INTRA_PARALLEL
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Enable intra-partition parallelism |
NO
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DB2set Parameters
Use the db2set command to set the parameters (for example, db2set DB2_HASH_JOIN = NO) referenced in Table 6. Under Windows, you access this command through the DB2 Command Line Processor.
Table 6. db2set Parameters
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DB2_HASH_JOIN
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Turns off hash joins in the optimizer. |
NO |
DB2_CORRELATED_PREDICATES
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When set to YES, the optimizer is able to determine whether predicates in a query are related, which permits DB2 to calculate the filter factor more accurately. |
YES |
DB2_PIPELINED_PLANS
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Tells the DB2 optimizer to favor pipeline execution plans—plans that are left deep and have no temporary result sets. |
ON |
DB2_INTERESTING_KEYS
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Limits the number of execution plans generated by the DB2 optimizer. |
ON |
DB2_PARALLEL_IO
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Useful when using RAID devices. For more information, see your DB2 vendor documentation. |
* |
DB2_STRIPED_CONTAINERS
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Useful when using RAID devices. For more information, see your DB2 vendor documentation. |
ON |
DB2_NO_PKG_LOCK
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To bind the Siebel package with siebbind, this package must be off. |
OFF |
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