MISSION CRITICAL COMPUTING Siebel Database Considerations

MISSION CRITICAL COMPUTING Overview Database Setup Guidelines Statistics and Indexes Execution plans Database Operations and Maintenance Monitoring

MISSION CRITICAL COMPUTING Lesson: Database Setup Guidelines Guidelines – Server Settings Guidelines – Database Settings

MISSION CRITICAL COMPUTING Guidelines – Server Settings Format the NTFS drive(s) or SAN to 64k blocks (default is 4k) Review /3GB and /PAE switches Install SQL Server with same Code Page / Collation as the Siebel database Allocate sufficient memory to SQL Server For memory, consider number of concurrent users and workload Disable Query Parallelism Set the Index Fill Factor prior to building Indexes

MISSION CRITICAL COMPUTING Guidelines – Database Settings Preallocate enough space to Siebel database to avoid Autogrow Create Siebel database with the correct Collation (code page) Increase size of Model database Resize tempdb Place tempdb, Data Files, and Transaction Log on distinct physical devices (plan for 3+ physical drives) Allocate sufficient space for Data Files and Transaction Log, including file growth Disable the Auto Shrink parameter Enable the Auto Create Statistics and Auto Update Statistics parameters Run script to identify Indexes with poor cardinality

MISSION CRITICAL COMPUTING Lesson: Statistics and Indexes Statistics Indexes

MISSION CRITICAL COMPUTING Statistics Statistics are collected so SQL Server understands the volume and distribution of data within a Table With auto statistics, 20% of the rows in a Table must change before auto statistics is invoked for that Table Manually update statistics if appropriate Can choose between FULLSCAN (all rows) or sampling a percentage of the rows FULLSCAN mode may take time for large Tables Update statistics for all Tables in Siebel database (including Repository, EIM, etc.)

MISSION CRITICAL COMPUTING Indexes Will generally observe more intelligent decisions when SQL Server selects an Index due to statistics on Tables SQL Server does not do “Sparse Indexing” Run script to identify Indexes with poor cardinality

MISSION CRITICAL COMPUTING Execution Plans Analogous to EXPLAIN Use Query Analyzer Provides a graphical representation of the Execution Plan Move mouse over each icon for details Index Tuning Wizard may help to ultimately provide a more efficient Execution Plan, but beware unknown impact on other functionality

MISSION CRITICAL COMPUTING Database Operations and Maintenance Use the Database Maintenance Plan Wizard to automate important DBA tasks Backups Check Database Integrity Reorganize Data and Index pages Update Statistics Consider having different Maintenance Plans and schedules for each task

MISSION CRITICAL COMPUTING Lesson: Monitoring Monitoring – Event Viewer Monitoring – Enterprise Manager Monitoring – Performance Monitor (perfmon)

MISSION CRITICAL COMPUTING Monitoring – Event Viewer Provided with the OS Application, Security, and System logs Events may include the date, time, source, user, etc. May provide a wealth of information when attempting to diagnose the root cause (preceding event) of an issue (e.g. disk drive failure)

MISSION CRITICAL COMPUTING Monitoring – Enterprise Manager Create Alerts for events such as Table Integrity error, Hardware Error, etc. Alert response (action) may be to run a job, notify/ operators, etc.

MISSION CRITICAL COMPUTING Monitoring – Performance Monitor (perfmon) Provided with the OS Can create Alerts and log them to Event Viewer’s Application log Numerous Counters for OS and SQL Server  Processor - % Processor Time  Physical Disk - %Disk Time, Avg. Disk Queue Length  Memory – Available MBytes  System – Context Switches / sec  SQL Server Locks – Lock Waits/sec, Number of Deadlocks/sec  SQLServer: Access Methods Full Scans/sec, Page Splits/sec, Table Lock Escalation/sec  SQLServer: Buffer Manager Buffer Cache Hit Ratio, Lazy Writes/sec, Page Reads/sec, Page Writes/sec, ReadAhead Pages/sec  SQLServer: Databases - Transactions/sec  SQLServer: General Statistics - User Connections

MISSION CRITICAL COMPUTING Review Database Setup Guidelines Statistics and Indexes Execution plans Database Operations and Maintenance Monitoring