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Using either SQL*Plus or Database Control, create a tablespace called SMALLTS with a single datafile that is 10 MB, using a uniform extent size of 1 MB Make sure that it will not autoextend Set the thresholds for the warning and the critical space usage alerts to 70% and 80% This can be done with SQL*Plus but is much easier with Database Control, as shown here:
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Create a table in the new tablespace, and manually allocate extents to it This will produce an error once nine extents have been allocated Observe the alert that has been raised in Database Control, and as an entry in the DBA_ OUTSTANDING_ALERTS view Note that it may take a few minutes before the alert is raised; this is because the space usage alert is only monitored every ten minutes Fix the problem! Think of several techniques Observe that the alert has been cleared in Database Control and removed from DBA_OUTSTANDING_ALERTS to DBA_ALERT_HISTORY Tidy up by dropping the tablespace
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1 B A job will run in the maintenance windows unless STATISICS_LEVEL is set to BASIC A and C are wrong because they specify the wrong component to carry out the task D is wrong because the GATHER AUTO option controls what objects to analyze, not whether to analyze at all 2 C Optimizer statistics are not maintained in real time, only refreshed when the object is analyzed A and D are wrong because they would affect the nightly refresh of the statistics, not a refresh during the day B is wrong because it would freeze the statistics permanently, not just for the day 3 B The optimizer uses the latest statistics, which are stored in the data dictionary A is wrong because the statistics are stored independently of the actual segments C is wrong because the AWR stores historical values, which are not used for real-time parsing D is wrong because the SGA stores the execution plan itself, not the information used to generate it
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4 C Increasing the time between snapshots will reduce the number stored, and therefore the space needed 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 5 A This is exactly the type of situation for which baselines are intended 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
Use the Advisory Framework
6 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 is wrong because the auto-tasks 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
Self Test Answers
7 C and E These run in every maintenance window, but implementing the recommendations is up to the DBA A is wrong because MMON invokes the ADDM B, D, and F are wrong because they are advisors that must be invoked manually 8 A, C, B, E, and D This is the correct sequence All other sequences are wrong
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