摘要: 在AWR 看到local write waits和 enq: RO - fast object reuse 的 等待事件。 一.Local write waits 等待说明网上对local write waits 的说明:Note 1: Typically DBWRhas to free up some buffers when you want to read something from the disk.During this process there are chances that you will be waiting f... 阅读全文
posted @ 2012-07-10 23:07 davedba 阅读(462) 评论(0) 推荐(0) 编辑
摘要: 在AWR 看到local write waits和 enq: RO - fast object reuse 的 等待事件。 一.Local write waits 等待说明网上对local write waits 的说明:Note 1: Typically DBWRhas to free up some buffers when you want to read something from the disk.During this process there are chances that you will be waiting f... 阅读全文
posted @ 2012-07-10 23:07 davedba 阅读(446) 评论(0) 推荐(0) 编辑
摘要: 在AWR中,我们可能会看到如下信息: 这里是Read byother session 等待占用了很多的时间。关于Read by other session 的说明如下: When informationis requested from the database, Oracle will first read the data from disk intothe database buffer cache. If two or more sessions request the sameinformation, the first se... 阅读全文
posted @ 2012-07-10 22:12 davedba 阅读(113) 评论(0) 推荐(0) 编辑
摘要: 在AWR中,我们可能会看到如下信息: 这里是Read byother session 等待占用了很多的时间。关于Read by other session 的说明如下: When informationis requested from the database, Oracle will first read the data from disk intothe database buffer cache. If two or more sessions request the sameinformation, the first se... 阅读全文
posted @ 2012-07-10 22:12 davedba 阅读(131) 评论(0) 推荐(0) 编辑
摘要: 有时我们会在AWR中看到如下信息: 里面对应的3条SQL 如下:(1)call dbms_space.auto_space_advisor_job_proc( )(2)calldbms_stats.gather_database_stats_job_proc ( )(3)insert into wri$_adv_objspace_trend_dataselect timepoint, space_usage, space_alloc, quality fromtable(dbms_space.object_growth_trend(:... 阅读全文
posted @ 2012-07-10 22:06 davedba 阅读(584) 评论(0) 推荐(0) 编辑
摘要: 有时我们会在AWR中看到如下信息: 里面对应的3条SQL 如下:(1)call dbms_space.auto_space_advisor_job_proc( )(2)calldbms_stats.gather_database_stats_job_proc ( )(3)insert into wri$_adv_objspace_trend_dataselect timepoint, space_usage, space_alloc, quality fromtable(dbms_space.object_growth_trend(:... 阅读全文
posted @ 2012-07-10 22:06 davedba 阅读(793) 评论(0) 推荐(0) 编辑
摘要: 一.Rebuild索引与并行度说明在之前的Blog里整理了一些列有关索引相关的Blog,如下:Oracle 索引 详解http://blog.csdn.net/tianlesoftware/article/details/5347098如何加快建index 索引 的时间http://blog.csdn.net/tianlesoftware/article/details/5664019Oracle 索引扫描的五种类型http://blog.csdn.net/tianlesoftware/article/details/5852106Oracle 索引的维护http://blog.csdn.ne 阅读全文
posted @ 2012-07-10 21:11 davedba 阅读(196) 评论(0) 推荐(0) 编辑
摘要: 一.Rebuild索引与并行度说明在之前的Blog里整理了一些列有关索引相关的Blog,如下:Oracle 索引 详解http://blog.csdn.net/tianlesoftware/article/details/5347098如何加快建index 索引 的时间http://blog.csdn.net/tianlesoftware/article/details/5664019Oracle 索引扫描的五种类型http://blog.csdn.net/tianlesoftware/article/details/5852106Oracle 索引的维护http://blog.csdn.ne 阅读全文
posted @ 2012-07-10 21:11 davedba 阅读(504) 评论(0) 推荐(0) 编辑