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摘要: oracle 10g、11g能够做到恢复指定的、被破坏的块.ObjectivesAfter completing this lesson,you should be able to :Detect and repair database corruptionHandle block corruptionSet up Automatic Diagnostic RepositoryRun health checksData Recovery AdvisorFast detection,analysis,and repair of failuresMinimizing disruptions for 阅读全文
posted @ 2013-06-04 16:55 ArcerZhang 阅读(138) 评论(0) 推荐(0) 编辑
摘要: SQL Performance Analyzer : OverviewTarget users:DBAs,QAs,application developersHelps predict the impact of system changes on SQL workload response time.Builds different versions of SQL workload performance (that is,SQL execution plans and execution statistics)Executes SQL serially(concurrency not ho 阅读全文
posted @ 2013-06-04 14:47 ArcerZhang 阅读(178) 评论(0) 推荐(0) 编辑
摘要: SQL Access Advisor:OverviewTypical SQL Access Advisor SessionWorkload SourceRecommendation OptionsReviewing Recommendations 阅读全文
posted @ 2013-06-04 13:31 ArcerZhang 阅读(120) 评论(0) 推荐(0) 编辑
摘要: Using the SQL Tuning AdvisorUse the SQL Tuning Advisor to analyze SQL statements and obtain performance recommedationsSources for SQL Tuning Advisor to analyze:Top Activety:Analyzes the top SQL statements currently activeSQL Tuning Set:Analyzes a set of SQL statements you provideHistorical SQL(AWR): 阅读全文
posted @ 2013-06-04 12:34 ArcerZhang 阅读(99) 评论(0) 推荐(0) 编辑
摘要: 今天一个同学问的一个有关数据库的问题,我看了一下alert日志,发现有以下报错信息。现记录下来,以备后用ORA-19815: WARNING: db_recovery_file_dest_size of 5218762752 bytes is 100.00% used, and has 0 rema... 阅读全文
posted @ 2013-06-03 23:13 ArcerZhang 阅读(1145) 评论(0) 推荐(0) 编辑
摘要: AWR能够帮助DBA识别占用资源最多的SQL语句.SQL Tune Advisor执行步骤捕获到占用资源较多的SQLAdvisor对捕获到的、占用资源较多的SQL进行分析Advisor产生建议的SQL执行实施SQLSQL Tuning Advisor:OverviewAutomatic SQL Tuning:OverviewAutomatic SQL Tuning automates the entire SQL tuning process and replaces manual SQL tuning.Optimizer modes:Normal modes:Tuning mode or A 阅读全文
posted @ 2013-06-03 20:21 ArcerZhang 阅读(198) 评论(0) 推荐(0) 编辑
摘要: oracle的智能体现:oracle在AWR执行完成一次快照收集之后,ADDM会自动监控本次收集快照之后发现的影响性能的SQL或者其他组件,然后自动调用相应的Advisor进行分析,被报告出分析结果.ObjectivesAfter completing this lesson,you should be able to :Use the SQL Tuning Advisor to:-Identify SQL statements that are using the most resources-Tune SQL statements that are using the most resou 阅读全文
posted @ 2013-06-03 19:24 ArcerZhang 阅读(123) 评论(0) 推荐(0) 编辑
摘要: oracle搜集表的信息,并不是每张表都搜集,一下若干种情况,会被搜集到:统计信息是空的表,会被搜集达到一定比例的表,会被搜集在搜集表信息的时候,加上CASCADE关键字之后,就会搜集此表相关的索引等信息.Statistics Preferences:OverviewUsing Statistics PreferencesPUBLISH:Used to decide whether to publish the statistics to the dictionary or to store them in a pending area before.publish the statistic 阅读全文
posted @ 2013-06-03 18:24 ArcerZhang 阅读(195) 评论(0) 推荐(0) 编辑
摘要: Optimizer Statistics CollectionWays to collect statistics:-Automatically:Automatic Maintenance Tasks(自动搜集统计数据信息的功能,是自oracle10g以后才有的)查看系统里的job信息SQL> select owner,job_name from dba_scheduler_jobs;OWNER JOB_NAME------------------------------ ------------------------------SYS ... 阅读全文
posted @ 2013-06-03 15:47 ArcerZhang 阅读(368) 评论(0) 推荐(0) 编辑
摘要: 1、analyze table emp1 compute statistics;2、dbms_stats package搜集系统的统计信息:dbms_stats.gahter_system_stats 阅读全文
posted @ 2013-06-03 15:36 ArcerZhang 阅读(314) 评论(0) 推荐(0) 编辑
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