wait event

When a blocking txn id for DDL wait event occurs on Oracle 11gR2, 11gr2txn This article is the original article, reproduced please indicate the source: http://blog.csdn.net/msdnchina/article/details/44726875   In a recent case (oracle db of version 1

New Features of Oracle11g trigger DirectPathRead wait event case New Features of Oracle 11g trigger Direct Path Read wait event case Recently, a production database of a company experienced performance problems. My colleague shared this case

Reproduce the library cache lock wait event at 11 GB in Oracle From the example below, we can see that re-Compilation of objects in the production database will lead to library cache lock, so we should try to avoid compiling objects during business

Find the ' Cursor:pin S wait on X ' waiting event blocker session (i.e.: Holder session)From:How to determine the Blocking Session for Event: ' Cursor:pin S wait on X ' (Doc ID 786507.1)Suitable for:Oracle database-enterprise edition-version 10.2.0.1

Direct path write wait event causes database hang, directhang My colleague responded that the database seemed to have been suspended for a while more than 10 minutes and asked me to check whether there were any problems with the database. The

Encounter Library cache Load Lock wait event:In troubleshooting Library Cache:lock, Pin and Load Lock (Doc ID 444560.1) This article explains the wait event in detail:If an object was not in memory and then a library cache lock cannot was acquired

DB file scattered read wait event:we often meet with the db file scattered read wait event, which may be more common in a production environment. This event indicates that the user process is reading the data into the buffer cache, waiting until the

Buffer busy waits (Hot block contention)Website Explanation:This wait indicates that there is some buffers in the buffer cache that multiple processes is attempting to access C oncurrently. Query V$waitstat for the wait statistics for each class of

SQL> select * from v $ version; BANNER--------------------------------------------------------------------------------Oracle Database 11g Enterprise Edition Release 11.2.0.1.0-64bit ProductionPL/SQL Release 11.2.0.1.0-ProductionCORE 11.2.0.1.0

Waiting event category: ========================================================== ========================================================== ==================================== Administrative: Wait for the user to wait for the DBA command

This article is original article, reprint please indicate source: http://blog.csdn.net/msdnchina/article/details/44726875In a recently processed case (11.2.0.4 version of Oracle DB), the blocking Txn ID for DDL was encountered for this wait

Reason: Resources are tight and waiting for their release.Cause of the reason: 1. LGWR and DBWN process write too slow; 2. Buffer and latch not availableReasons for the Cause: Full table scan, library cache latches number too many.Views:

1. Cause of productionThis wait event typically occurs when the database is read in chunks, indicating that there is a wait associated with a full table scan and a quick index scan . This usually means too many full-table scans, or insufficient I/O

-- Main Waiting ViewSelect * from V $ session_wait;Select * from V $ session_event;Select * from V $ system_event;Select * from V $ waitstat where count> 0; -- Related viewSelect * from V $ session_wait Select * from V $ filestat Select * From

The log file sync (Log File sync) Wait event has a parameter: Buffer #. In Oracle Database 10 Gb, such wait events are located below commit wait events. When processing Log File sync wait events, pay attention to the following ideas:◎ Log File sync

Measure the database status and optimize the database. After a process is connected to the database, all the waits for the process are recorded and displayed in a series of performance views. By waiting for the event, the user can quickly find the

Encounter cursor: pinS wait event Encounter cursor: pin S wait event Background:Master Database: Two rac nodes. Each node has eight logical CPUs and 16 GB memory.There are dg slave machines, and the dg slave machine is a single machine: 8 logic

Database version: Oracle 11.2.0.4.0 The reason for the CBC latch:--only when the logical reading occurs 1.CBC latch protection of different linked lists, different BH: the same latch under multiple bucket are simultaneously accessed, (one latch

This is the case for a customer in March, because after a server hardware failure, the business translation occasionally appears slow to commit. Let's take a look at the awr situation first.We can see that the load profile information for this

DB Name db Id Instance Inst Num Release Cluster Host------------ ----------- ------------ -------- ----------- ------- ------------Lixora 1409317108 Lixora 1 9.2.0.1.0 NO lixora-dataSnap Id snap time Sessions curs/sess Comment------- ----------------