wait event

Before finishing an article: Oracle Wait Events Http://blog.csdn.net/tianlesoftware/archive/2010/05/31/5635934.aspx one. Knowledge of waiting events: 1.1 Wait events can be divided into two main categories, that is, idle (IDLE) Wait events and non

PCM resource-related wait eventsGC CURRENT/CR block Request: This wait event indicates that the application instance is requesting a current block or CR block, but the resource Master instance's LMS process has not responded to its request.GC

The wait event view provided by Oracle allows us to obtain detailed information about the specified session and instance-level wait events. These views are V $ session_wait, V $ session_event, and V $ system_event. However, these views are powerless

  Wait for the event source to start The concept of wait events is introduced from ORACLE 7.0.12, with roughly 100 wait events. In ORACLE 8.0, this number has increased to approximately 150, with approximately 220 events in ORACLE 8I and about 400

Oracle's wait events are an important basis for measuring Oracle health and metrics. The concept of wait events was introduced in Oracle7.0.1.2, with roughly 100 waiting events. This number is increased to approximately 150 in Oracle 8.0, with

 1. RAC global wait Event Description In the RAC environment, the most common wait events related to global cache adjustment are global cache Cr request, global cache busy, and equeue.   When a process needs to access one or more blocks, Oracle

Generally, when you submit an SQL statement, there will always be one or more waiting events. That is to say, the process has to wait because the required resources are occupied. Oracle provides us with an available view of these wait events. Based

Oracle Study--oracle Wait event (3)Db file Parallel readThis is a very misleading wait event, and in fact this wait event is not related to parallel operations such as parallel queries, parallel DML. This event occurs when the database is recovering,

Oracle Study--oracle Wait event (5)Db File Single writeThis wait event usually occurs only in one case when Oracle updates the header information of the data file (for example, checkpoint occurs). When this wait event is obvious, it is important to

Today, the user's response system is very slow. An AWR has found a large number of read by other session wait events, accompanied by a large number of DB file sequential read wait events: 650) This. width = 650; "style =" border-right-0px;

Ext.://http://blog.chinaunix.net/uid-23177306-id-2531235.htmlFirst, direct path read1. Wait events associated with direct read. When Oracle reads data blocks directly into the PGA (Process Global Zone) of the session, it bypasses the SGA (System

Oracle OWI wait Event History View and related views the wait event view provided by Oracle allows us to obtain detailed information about the specified session and instance-level wait events. These views are v $ session_wait, respectively, v $

Today is. Starting from today, I plan to learn a wait event every day before the Spring Festival. Today I will record the wait event note read by other session. What is read by other session? This wait event occurs when we are trying to access a

An error occurred while deleting the tablespace in the customer database. I tried all the methods. I also want to keep track of the waiting event when deleting the table. enq: TTcontention: I wanted to keep track of the event first, check the wait

Possible causescontrol file Sequential readReading from the control file. This happens in many cases. For example, while:1. Making a backup of the control files2, sharing information (between instances) from the control file3. Reading other blocks

DB file Scattered readWebsite Explanation:This event signifies, the user process is reading buffers to the SGA buffer cache and is waiting for a physical I/O call to return. A db file scattered read issues a scattered read to read the data into

In the RAC Database In the RAC Database The 'Log file sync' wait event in the RAC database is more complex than the 'Log file sync' wait event in the Standalone Database, mainly because the RAC database needs to synchronize the SCN to all

Free buffer waitsWebsite Explanation:This wait event indicates a server process is unable to find a free buffer and have posted the database writer to Mak e free buffers by writing out dirty buffers. A dirty buffer is a buffer whose contents has

Oracle Study--RESMGR:CPU Quantum wait eventThe "Resmgr:cpu Quantum" wait event appears in the AWR report:650) this.width=650; "Src=" http://img.blog.csdn.net/20150602162750478?watermark/2/text/

The 'Log file sync' wait event in the RAC database is more complex than the 'Log file sync' wait event in the Standalone Database, mainly because the RAC database needs to synchronize the SCN to all instances. The 'Log file sync' wait event in the