对于大表的统计信息收集，我们可以加degree参数，使得扫描大表的时候，进行并行扫描，加快扫描速度。 但是这在收集的时候，还是进行一个表一个表的扫描。并没有并发的扫描各个表。在oracle 11.2.0.2之后，就有了一个参数，可以并发扫描表（或者分区），这就是CONCURRENT参数。你可以通过 […]
Bug Issues Known to cause Wrong Results
LAST UPDATE:
|
1 |
Dec 15, 2016 |
APPLIES TO:
|
1 2 3 4 |
Oracle Database - Enterprise Edition - Version 7.0.16.0 and later Oracle Database - Standard Edition - Version 7.0.16.0 and later Oracle Database - Personal Edition - Version 7.1.4.0 and later Information in this document applies to any platform. |
PURPOSE:
|
1 2 |
This document provides information on bugs known to cause "wrong results". "Wrong results" in this context has quite a broad classification - it may be a performance monitoring view giving slightly misleading information, or may be completely wrong rows returned (or missing) from a query result set. These issues can be particularly difficult to match to a known bug as the symptom often depend on the query. The aim here is to provide a list of bugs known to cause wrong results and to provide both version affected and radio options to trim the list. |
KNOWN BUGS: NB Pr […]
Common X$ dictionary table queries for ORA-4031 investigation
LAST UPDATE:
|
1 |
Jun 15, 2011 |
APPLIES TO:
|
1 2 3 |
Oracle Server - Enterprise Edition - Version: 9.2.0.1 to 11.1.0.8 - Release: 9.2 to 11.1 Information in this document applies to any platform. Customers should have limited access to these scripts. There can be database hangs and impacts to performance running these too often. |
PURPOSE: There are a number of x$ queries in various notes […]
Documented Database Bugs With High “Solved SR” Count
APPLIES TO:
|
1 |
Oracle Database - Enterprise Edition - Version 9.2.0.8 and later |
PURPOSE:
|
1 2 3 4 5 6 7 |
This note lists "documented" database bugs that have been marked as the solution to a "high number of Service Requests". For the purpose of this listing: A "documented" bug means one with a bugno.8 KM document created from BugTag data. A "high number of Service Requests" means that there are more than 50 "Solved SR" entries for the bug - ie: all bugs in this doc have > 50 "Solved SR" entries from the SR closure data. It is suggested to restrict the list based on the version of interest, and then use the radio buttons to check on particular features / symptoms / facts linked to the bug descriptions. The list includes some bugs with a "D" in the "NB" column - this is used to denote a bug fix that is DISABLED by default and so a customer may encounter that issue in DB versions where the bug is marked as fixed. |
KNOWN BUGS: NB Prob Bug Fixed Description P IIII 7272646 Linux- […]
从航拍萧山机场飞机降落想到的……
自由是为自觉的人准备的，可往往少数不自觉的人破坏了大部分人的自由。 1月15日，有一段航拍杭州萧山机场飞机降落的视频，在飞友圈中激起很多反响。 随机，公安机关介入调查： 很快，公安部出台了《治安管理处罚法（修订公开征求意见稿）》，如无意外，一个月后将通过并生效。 飞友们所担心的“一刀切”的管理办法很 […]
Known Issues for Database and Query Performance Reported in 12C
LAST UPDATE:
|
1 |
Dec 13, 2016 |
APPLIES TO:
|
1 2 |
Oracle Database - Enterprise Edition - Version 12.1.0.1 to 12.1.0.2 [Release 12.1] Information in this document applies to any platform. |
PURPOSE:
|
1 2 3 4 5 |
In recent quarters, during non-code closure bug review for Performance, it was found that more than 50% of duplicates (36,96) closed by Sustaining Engineering (SE) belonged to version 12.1. As a result this document was created to list most commonly reported and share this with Tier-1 engineers so that they could check this before logging any new bugs. Thus the Goal of this document is to provide a list of known bugs reported in 12C for database & SQL performance for support analysts to check before logging new bugs. In addition to the bugs listed in this article, there is also a useful list of Documented Database Bugs With High "Solved SR" Count where a high number of Service Requests means that there are more than 50 "Solved SR" entries for the bug - ie: all bugs in this doc have > 50 "Solved SR" entries.” : Document 2099231.1 Documented Database Bugs With High "Solved SR" Count |
DETAILS: Query Op […]
下一站，DJI大疆
不少朋友可能已经知道我离职了，是的，我已经不在ORACLE公司，我去了大疆（DJI）。 加入大疆是个非常巧合的机缘。 2016年9月27日，大疆在纽约发布了他们的新的无人机：御（Mavic Pro）。 是的，就是这个小家伙，让我有了和当初第一眼见iPhone一代时候的感觉（我也是iPhone一代的用 […]
Oracle支持在docker上跑oracle数据库了
Oracle开始支持在docker上oracle数据库了，注意，是单实例，RAC不支持。docker的操作系统需要时候Oracle linux 7或者RHEL 7。 Oracle will support customers running Oracle Database (single insta […]
关于物理Dataguard切换导致索引坏块的问题
在11.2.0.2之后，有一个非常重要的dataguard的patch。在使用物理dataguard环境（包括ADG），进行switchover之后，存在导致index block上的invalid SCNs的坏块问题。 国内已经好几个行业的大客户，都遇到了这个问题。 在index block中的失 […]
老书分享《让世界更美好：塑造了一个世纪和一家公司的理念》（IBM百年科技创新）
今天整理dropbox文件夹的时候，发现还保留着老东家IBM百年诞辰的时候，发的一本名为《让世界更美好：塑造一个世纪与一家公司的理念》的专刊。 百年老店自然有他存活百年的道理，当年这本书发给员工的时候，不知是基于成本控制的考虑，还是员工激励的考虑，并不是所有员工都能拿到纸质书。我只是“有幸”拿到了它 […]
swap不足导致ora-4030
客户一个测试环境，一个主机上面运行了很多数据库，某库的程序会时不时报错ora-4030。 加大了pga，然后还检查了ulimit的 data 和 stack都是ulimit。还是报错。 进而检查/var/adm/messages，发现有报错swap不足的情况。 所以，解决方法是加大物理内存，或者加大 […]
Solaris操作系统真的停止开发了吗？
Solaris系统将被停止开发，这个消息，据我所看到的，最初的来源是来自thelayoff网站的消息『Solaris being canned, at least 50% of teams to be RIF’d in short term』 All hands meetings bei […]