blkd

PX Deq Credit: send blkd(4) – wait for what?

JustafewdaysagoagottotwoOracleDBAsdiscussingwhythehavesomuch“PXDeqCredit:sendblkd”onasystem.Andifthatiscausingtheirperformanceproblems.Thearesomeblogontheinternetclaimingithastodowithqcdistributionand
chinadm123·2013-09-08 09:50

PX Deq Credit: send blkd (2)---Script to Report the Degree of Parallelism DOP

Appliesto:OracleDatabase-EnterpriseEdition-Version8.1.5.0andlaterOracleDatabase-PersonalEdition-Version8.1.5.0andlaterInformationinthisdocumentappliestoanyplatform.PurposeProvidescriptforaDBAtocheckth
chinadm123·2013-09-07 17:00

PX DEQ CREDIT SEND BLKD(1)--Tips to Reduce Waits for "PX DEQ CREDIT SEND

TipstoReduceWaitsfor"PXDEQCREDITSENDBLKD"atDatabaseLevel(文档ID738464.1)最近碰到了PXDeqCredit:sendblkd事件，具体如下面AWRreport截图：  mos上相关的论述：Appliesto:OracleDatabase-EnterpriseEdition-Version9.0.1.0andlaterInformat
chinadm123·2013-09-07 16:25

PX Deq Credit: send blkd (3)---Script to monitor parallel queries (文档 ID 45

Scripttomonitorparallelqueries(文档ID457857.1)Appliesto:OracleServer-EnterpriseEdition-Version9.2.0.1andlaterInformationinthisdocumentappliestoanyplatform.***Checkedforrelevanceon28-April-2010***Purpose
chinadm123·2013-09-07 15:10

2013-03-13等待事件PX Deq Credit: send blkd

 今天出现严重的等待事件PXDeqCredit:sendblkd，与实施组沟通，系统并没有慢的情况。SnapIdSnapTimeSessionsCursors/SessionBeginSnap:2152413-3月-1314:00:2436519.5EndSnap:2152813-3月-1318:00:1535720.6Elapsed:239.84(mins)DBTime:1,465.76(min
guogang83·2013-03-25 15:00

块设备读写流程

1、  用户态程序通过open()打开指定的块设备，通过systemcall机制陷入内核，执行blkd
srw11·2012-05-03 13:00

Zw函数与Nt函数的分别与联系

ZwOpenProcessEvaluateexpression:2089999739=7c92dd7blkd>?ntdll!
evi10r·2011-09-02 10:00

PX Deq Credit: send blkd  

在AWR报告中出现如下：Top5TimedEvents                                        Avg%Total~~~~~~~~~~~~~~~~~~                                       wait  CallEvent                                Waits   Time(s)  (ms
marvelyu·2011-08-09 09:00

等待时间 PX Deq Credit: need buffer 和 PX Deq Credit: send blkd

author：skatetime：2011/05/03 等待时间PXDeqCredit:needbuffer和PXDeqCredit:sendblkd 说明：Deq=DEQUEUE，这是一个关于出队的等待； PX等待事件发生在并行查询的不同进程之间交互数据或信息时。   这些等待事件在系统负载很轻的时候，大都是没问题的，但是当系统的负载很重，此类等待事件已经进入top5等待事件中那就需要注意了，在
wyzxg·2011-05-03 20:00

oracle wait event:PX Deq Credit: send blkd

Just a few days ago a got to two Oracle DBAs discussing why the have so much “PX Deq Credit : send blkd
wapysun·2010-01-07 14:00
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