Oracle Database 11 g - Online Public Access Catalog

xxiv■INTRODUCTIONPerformance ManagementBesides the automatic running of the SQL Tuning Advisor every night, several innovations improvedatabase performance. The key performance-related improvements include the following:• Automatic Workload Repository baseline enhancements now let you create movingwindow baselines and baseline templates, in addition to fixed baselines.• SQL Plan Management lets you automatically control SQL plan evolution.• Multicolumn statistics provide more useful data to the optimizer in cases where columnsare related.• Private statistics let you test optimizer statistics before publishing them for usage by thequery optimizer.• The server-side result cache enables the caching of SQL and PL/SQL results, thus dramaticallyincreasing performance. There is also a new client-side result cache.• The SQL Test Case Builder lets you easily create test cases so you can reproduce aproblematic SQL incident on another system.Enhanced Fault Diagnosis CapabilityOracle Database 11g provides a consolidated fault diagnostic capability, including the followingcomponents, to make fault diagnosis and repair easier than ever:• The automatic diagnostic repository lets you consolidate all diagnostic data in onecentral location outside the database.• Automatic Health Monitor lets you perform both proactive and reactive databasehealth checks.• Support Workbench helps with several diagnostic tasks, including transmitting incidentreports to Oracle Support.• Incident Packaging Service is an efficient way of packaging all diagnostic data in an editablepackage to send to Oracle Support.Data Guard EnhancementsOracle packs significant new features in the Oracle Database 11g Data Guard technology stack.The latest and greatest Data Guard advancements are as follows:• Real-time query standby database• Snapshot standby database• Logical standby database improvements• Redo log compression