javascript barcode scanner example 24: The AWR and the Alert System in Software

Printer Code-39 in Software 24: The AWR and the Alert System

24: The AWR and the Alert System
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1 C Increasing the time between snapshots will reduce the number stored, and therefore the space needed A, B, and D A is wrong because it is not possible to relocate the AWR B is wrong because the space needed to store a snapshot is not related to the snapshot frequency; this would actually have the opposite effect to that desired D is wrong because the automatic maintenance tasks do not control snapshots, and it is snapshots that take up the bulk of the space in the AWR 2 A This is exactly the type of situation for which baselines are intended B, C, and D B would work, but you would need a SYSAUX tablespace the size of Jupiter; it is not a good solution C is wrong because the available space has no effect on the retention time D is wrong because STATISTICS_LEVEL controls how much information is gathered, not for how long it is kept 3 A, B, and C MMON will always generate an ADDM report when a snapshot is taken (whether automatically or manually), and the DBA can request a report at any time D and E D is wrong because the AutoTasks do not include running the ADDM E is wrong because the Alert system signals real-time problems: it is not used to launch ADDM, which reports on activity after the events have occurred 4 C and E These run in every maintenance window, but implementing the recommendations is up to the DBA A, B, D, and F A is wrong because MMON invokes the ADDM B, D, and F are wrong because they are advisors that must be invoked manually 5 A, C, B, E, and D This is the correct sequence All other sequences are wrong 6 A MMON raises alerts B, C, and D B is wrong because Enterprise Manager does not raise alerts; it reports them C and D are wrong because neither server sessions nor the SMON are part of the Alert system 7 D Snapshot too old is a stateless alert and so goes directly to the alert history A, B, and C A is wrong because the STATISTICS_LEVEL refers to statistics, not alerts B is wrong because outstanding alerts do not get purged on any schedule, only by being resolved C is wrong because snapshot too old is a stateless alert, and thresholds can only apply to stateful alerts
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PART III
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Performance Tuning
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In this chapter you will learn to 052131 Use Automatic Memory Management 052132 Use Memory Advisors 052133 Troubleshoot Invalid and Unusable Objects 053141 Implement Automatic Memory Management 053142 Manually Configure SGA Parameters 053143 Configure Automatic PGA Memory Management 053151 Use the SQL Tuning Advisor 053152 Use the SQL Access Advisor to Tune a Workload 053153 Understand Database Replay
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OCA/OCP Oracle Database 11g All-in-One Exam Guide
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Performance management is a huge subject The treatment given in the core OCP syllabus is little more than an introduction There is an additional qualification (the Oracle Database 11g Performance Tuning Certified Expert ) that requires passing another exam that takes performance management further But even after studying for and passing that, you aren t finished As an Oracle DBA, you will study performance monitoring and enhancement techniques throughout your whole career Indeed, you may want Don t worry I ll find the problem soon inscribed on your tombstone The topics discussed here are tuning memory; tuning SQL; tuning segment access; identifying objects that are invalid or unusable; and using the Database Replay facility to generate workloads for testing
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Managing Memory
Memory usage in the Oracle instance falls into two categories: program global areas (the PGAs) that are private to each session, and the system global area (the SGA) that is shared by all the Oracle processes From release 9i it has been possible to automate the management of the PGA From release 10g it has been possible to automate the management of the SGA Release 11g can manage both PGA and SGA together TIP All Oracle memory usage is virtual memory The Oracle processes have no way of knowing if the memory to which they are connecting is in RAM or has been swapped (or paged) to disk However, swapping will cripple performance and should be avoided
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