wait event

Oracle performance adjustment: 1. data access mechanisms, such as table full scan, index range scan, index full scan, and fast index scan. These contents allow me to understand how SQL statements interact with Oracle, how data is returned to the

In SQLServer, extended events are used to obtain Session-level wait information and Session-level wait information enhancements in SQLServer 2016. sqlserver2016 What is waiting Briefly describe what is waiting: When an application initiates a

The view v $ session_wait can be used to view the current wait events of the system and related information of resources corresponding to the wait events. The view v $ session_wait can be used to view the current wait events of the system and

Parallel Execution, mainly used in OLAP systems to improve execution efficiency. The execution mechanism of PX is to create a process such as QC when initiating a parallel operation to coordinate information transmission of the parallel server

This usually shows the wait related to the full table scan.When the database performs a full table scan, the data will be distributed (scattered) into the buffer cache based on performance considerations. If the wait event is significant,It may

B-tree index access When an oracle process needs to access data blocks in a data file, Oracle has two types of I/O operations: 1) Random Access: Read a data block each time (represented by the "DB file sequential read" Wait event ). 2)

BKJIA database channel recommends the Oracle database debugging and performance optimization topic for you to better understand this article. The basic Oracle performance optimization methods include: 1) set up reasonable Oracle performance

Recently, I just made a performance optimization job. According to the one-week statspack report, I wrote an optimization. Solution. I. Existing major performance problems of the systemAccording to the typical statspack report in the last week, the

Author: skateTime: 2011/05/03   Waiting event: reliable message   The Metalink description is as follows:     When you send a message using the 'ksr' intra-instance BroadcastService, the message publisher waits on this wait-eventAll subscribers

This is a set of Windows RAC environments, as well as an environment that previously dealt with a performance failure caused by a row cache lock. Here is a record of the process: 1 for the one-hour AWR collection and analysis, first of all, from

InnoDB is currently the most popular storage engine in the MySQL database, and InnoDB is a big feature of other storage engines that support transactions and support row-granularity locks. Today, I would like to share with you the basic knowledge of

Luca Canali on 2016Topic: In this post you'll find a short discussion and pointers to the code of a few sample scripts that I had written using L Inux BPF/BCC and Uprobes for Oracle tracing.Previous Work and motivationsTools forDynamic Tracingis

There are several ways to generate SQL Trace: 1. Parameter setting: Very traditional method. System level: specified in the parameter file: Sql_trace=true or sql> alter system set sql_trace=true; Note: Sql_trace is enabled at the system level,

Windows XP Thread scheduling policy Windows 2000/XP Priority-driven multitasking based on thread implementation, and the thread scheduling strategy is different in single-processor and multiprocessor systems. The following describes the thread

Operating System Experiment Instruction book Computer College of Yantai University Operating System Course Group 2008-9-20 the first part of the operating system on the computer guidance Linux Operating system environment:RedHat

1, transaction slot update delete contention transaction slot each block has a data slot 2, 1 million partition 100 million partition difference ... 100 million The amount of data can be considered sub-division table partition Reasonable query

Original source: Http://www.eygle.com/statspack/statspack14-LogFileSync.htm When a user submits (commits) or rolls back (rollback), the redo information of the session needs to be written out to redo logfile. The user process notifies the LGWR to

Enterprise Insider of Oracle Database G Oracle Database G: Best 20-bit features for DBAs (13) Author Arup Nanda Source: OTN Week 13th Enterprise Manager Ten G Finally, discuss a one-stop tool for managing and using Oracle-whether for beginners

According to development feedback, the recent daily 7:30 app will alert, the app's log shows that the database connection pool is full, and the new connection is rejected.First, I did the ash report (Reporting interval: 7:25 ~ 7:35), and the wait

Transferred from: http://blog.csdn.net/cuker919/article/details/8767328Recently, due to the high CPU usage of the database, VCs often switch automatically, causing many problems.Recently learn about the database AWR Analysis database SQL execution