wait event

Receive a warning email:Load average on Xxx_server reached critical threshold values-169.5Current Load AVG = 169.5It's a production environment,And immediately boarded the server to look at the situationtop-05:01:00 up, 5:03, 4 users, Load average:18

Oracle dynamic performance view v $ event_name V $ EVENT_NAME view lists a set of waiting events. It provides information about sessions that must be processed:For official documents on www.2cto.com, see V $ EVENT_NAMEV $ EVENT_NAME displays

Database Version: Oracle 10.2.0.5-64Number of nodes: 2Operating system version: CentOS 5.6-64Awr report today finds gc buffer busy wait timeGc buffer busyThis wait event, also known as global cache buffer busy prior to Oracle 10g, specifies the time

Background environment:SQL Server 2005 or higherSelect * from a table, the data volume of the table is approximately 300,000 rows, the execution of the statement by observing sys.dm_exec_requests in the wait_type column found is Async_network_io

Today browse Metalink, see this article interpreting Raw Sql_trace, older an article, but really useful, so decided to roughly translate it. We know there are several ways to get a TRACE file in the background of an SQL statement execution, one

Company user feedback a system in 14:00~15:00 (2016-08-16) This time period reaction is relatively slow, so generated the time period of the AWR report,As shown above, the server is not busy during this period by comparing the elapsed time and db

(1)-v$session_waitThis is a critical view of looking for performance bottlenecks. It provides any case where the session is currently waiting in the database (if the session is currently not doing anything, it shows its last wait event). When there

When a frequent commitrollback or disk I/O problem occurs and a large number of physical read/write contention occurs, we will often see that the LOGFILESYNC wait event appears in the TOP When a frequent commit/rollback or disk I/O problem occurs

Learning Dynamic Performance TableSixth article -(1)-v$session_wait 2007.5.30This is a critical view of looking for performance bottlenecks. It provides any case where the session is currently waiting in the database (if the session is currently not

When lgwr is idle, it depends on the rdbms rpc message wait event and is in sleep state until three seconds. If lgwr finds that redo information needs to be written, then lgwr will execute the write operation, and the log file parallel write wait

Database Version: Oracle 10.2.0.5-64Number of nodes: 2Operating system version: centos 5.6-64 Awr report today finds gc buffer busy wait time Gc buffer busyThis wait event, also known as global cache buffer busy prior to Oracle 10g, specifies the

In-depth understanding of Oracle exadata Basic Information Original Title: Expert Oracle exadata Author: (US) ossborne (K.) [Translator's introduction] Translator: Huang kaiyao Zhang leyi Zhang Rui Press: Electronic Industry Press ISBN: 9787121174896

2014-12-18 BaoxinjianI. Summary Overview of basic methods for Oracle performance optimization 1) Set up a reasonable performance optimization target. 2) measure and record current performance. 3) Determine the current Oracle

Data blocks stored in buffer cache are stored in linked list mode. When a session wants to access/modify the block of buffer cache, it first needs to check whether the block exists in buffer cache with the hash algorithm and check if the same SQL

Data This article, from the Oracle China User Group (www.oracle.com.cn) article, finds it helpful to tune in to your learning performance: Original link: http://www.cnoug.org/viewthread.php?tid=25353 Statspack Report Data Results explanation I

Overview of basic methods for Oracle performance optimization1) Set up a reasonable performance optimization target. 2) measure and record current performance. 3) Determine the current Oracle performance bottleneck (what Oracle waits for and what

What is AWRCRT?The full name of AWRCRT isAUTOMATIC WORKLOAD REPOSITORYCHARTis an Oracle Performance Trend chart Reporting tool, which is a SQL script: Awrct.sql, there is only one SQL script.AWRCRT report is a chart that shows the performance trends

When performing full table scan (FTS) or full index scan (indexfullscan), Oracle tries its best to read multiple blocks at a time to ensure performance, which becomes multiblockIO. Each time multiblockIO is executed, it waits for the completion of

Database version: 11.2.0.3.0System version: CentOS 5.7A wait event was encountered: ASM file metadata operationWeb-based information that ASM file metadata operation is an internal wait event, there is no solution to the waiting event and the cause

1. View tablespaces Select tablespace_name, file_name from dba_data_files; 2. Create a statspack tablespace Create tablespace perfstat datafile 'd:/Oracle/oradata/perfstat. dbf' size 500 m The tablespace should be as big as possible. 3. Install