wait event

Calculation Formula of average transaction response time in Oracle Database Calculation Formula of average transaction response time in Oracle Database Note: This formula is taken from: eel , p316 Top 5 Timed Events Event Waits

Oracle diagnostic tool-RDA RDA is short for Remote Diagnostic Agent. It is a tool used by oracle to collect and analyze databases. Running this tool does not change any system parameters. RDA collects comprehensive data, it can simplify our daily

[Oracle]-[architecture-LGWR]-some understandings of LGWR: LGWR, short for Log Writer, is also a background process. It is mainly responsible for writing the log buffer content to online redo log files or groups on the disk. Before DBWn writes the

1. "Power-saving, smooth, high-quality application, fast response, good user experience ..." may be the apple system in the eyes of many users.2. The iphone user experience is still strong, as Apple continues to stick to dual-core in the era of CPU

Our browser detects a wait event, such as a user's behavior, if you click on a button or write something in input,The callback for the event will run in the built-in JavaScript and you will be able to do some DOM operations.So when the callback

As you have already learned, the scheduling between threads and threads is not controllable, so when we go to write multithreaded procedures, we must take into account the thread is out of order, and if not, there will be a thread safety problem.Why

Java provides built-in support for multithreaded programming. A multithreaded program contains two or more parts that can be run at the same time. Each part of such a program is called a thread, and each thread defines a separate execution

-- ***************** View the tablespace size *****************Select upper (F. TABLESPACE_NAME) "tablespace name", D. TOT_GROOTTE_MB "tablespace size (M )",D. TOT_GROOTTE_MB-F. TOTAL_BYTES "used space (M )",TO_CHAR (ROUND (D. TOT_GROOTTE_MB-F.

Manual cleaning of Oracle audit records Oracle Database Audit is very powerful, usually including standard audit (including user-level audit and system-level audit) and fine-grained audit. Even so, it is easy to cause performance problems if you are

The two tables in the test database have the same data (the table has A composite primary key A + B), but the same execution of DELETETABLEFROMT1T2WHEREA1ANDROWNUM100; the deletion time of table T1 is very long, and table T2 is deleted very quickly.

When using merger to update data today, the error message "ora600" is reported. A solution was found online, with the ora bug.   Http://sns.linuxpk.com/blog-52196-16983.html   YesterdayDatabaseA 600 error occurred while performing merge operations.

Note that the first call is spin_lock_irqsave (), but then the release of the lock uses spin_unlock () The second time to obtain the spin, it is required to use the spin _ lock_irq (), but the release lock uses the spin _unlock_irqrestore (),

1, osrunning Defined in ucos_ii.h and declared as boolean data type. This variable is used to indicate whether the OS is running. "1" indicates the running status, and vice versa. 2. ospriocur Defined in ucos_ii.h and declared as int8u data type,

First, let's continue to recall that there was a non-involved ngx_process_events_and_timers in the previous sub-thread execution operation. Today we will study this function. This article from: http://blog.csdn.net/lengzijian/article/details/7601730

[Data Source]: http://motion.chinaitlab.com/WINCE/30568.html I don't know who the author of this article is. These websites seem very irresponsible, even the author's name is not left, too much   As mentioned in CE's help document, creating oal is a

Zookeeper 1. Void pinmode (INT pin, int mode ); This function sets the Input and Output Modes of the pin and the input and output modes of PWM. InWiringpi onlyPin 1 (bcm_gpio 18) supports PWM output. 2. Void digitalwrite (INT pin, int value ); This

Research on Low Power strategy of Embedded Linux Abstract: Power consumption is a very important performance indicator for embedded devices. After the hardware design and selection, the power consumption level depends greatly on the software design.

  Author: Fang Weng (beginning of this article) Email: fangweng@taobao.com Mblog: weibo.com/fangweng Blog: http://blog.csdn.net/cenwenchu79/   Local Design First of all, it should be noted that this part of content is different from the first

  (5) Use BCB To Write multi-threaded applications   With the popularization of Windows systems worldwide, multithreading technology has been increasingly applied to many software designs. The use of multithreading technology can comprehensively

#! /Usr/bin/ENV python2.7 #-*-coding: UTF-8-*-# file: pg2.py # Date: 2013-6-30 # Author: wangyuimport pygamefrom pygame. locals import * From sys import exitpygame. init () screen_size = (640,480) screen = pygame. display. set_mode (screen_size, 0, 3