aed tuning

in 10g, Oracle launched its own SQL optimization aids : SQL Optimizer (SQL Tuning Advisor :STA) , it is the new Dbms_sqltune package. Use the STA to make sure that the optimizer is in CBO mode. but I think that using this tool is only suitable for people who don't understand SQL at all, and don't think that tools can solve problems. SQL is ultimately an expression of a business, how the tool might understand the business. SQL

Label:Objective About SQL Server Tuning series is a huge content system, not a word two words can be analyzed clearly, this article first in the SQL tuning in the most commonly used query plan to parse, to do a good job of the basic grasp, tamping basic skills! Then we talk about the overall statement tuning. Learn how to read and understand query plans, and enum

I will share 11 practical tips on Java performance tuning and java Tuning Most developers think that performance optimization is a complicated problem and requires a lot of experience and knowledge. Yes, it is not wrong. It is not easy to optimize the application to achieve the best performance, but it does not mean that you cannot do anything before getting the experience and knowledge. Below are a few sug

SQL Server Performance Tuning methodology and common tools, SQL Server Tuning In earlier articles, we mentioned the DETECT methodology in Performance Tuning. Here we will briefly review the DETECT methodology. Discover the problem: found the problem Lead e the conditions: Explore causes Track down possible approaches: provides possible solutions Execute the most

Today, developers continue to develop and deploy applications that use lamp (linux®, Apache, MySQL, and Php/perl) architectures. However, server administrators often have little control over the application itself, because the application is written by someone else. This article focuses on tuning the database layer to achieve maximum efficiency. About MySQL Tuning There are 3 ways to speed up the running

Article title: Overview of tuning methods for Linux network performance tuning. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Author: Yao Ye He Xiaoyu Yang bangqing Hongyun 　　 In two articles: Tuning LINUX network performanc

A basic knowledge 1.1 What is the performance Before performance tuning, let's first look at what performance is. As for performance, I think everyone who has studied Java can list a few points or even talk about it. In the book "Java TM Platform Performance", the following five aspects are defined as criteria for evaluating performance: 1 performance of the operation-which algorithm is the best performing performance? 2 memory allocation-How much

How to use Oracle's Dbms_sqltune package to execute SQL Tuning Advisor for SQL self-tuning1 ". Here is a simple example to illustrate the use of Dbms_sqltuneStart by running a SQL that you want to tune, and then get the SqlidSql> SELECT * from V$sqltext where sql_text like ' select * from dual% ';ADDRESS hash_value sql_id command_type PIECE sql_text---------------- ---------- ------------- ------------ ---------- --------------------------------------

How to use Oracle's Dbms_sqltune package to execute SQL Tuning Advisor for SQL self-tuning1 ". Here is a simple example to illustrate the use of Dbms_sqltuneStart by running a SQL that you want to tune, and then get the SqlidSql> SELECT * from V$sqltext where sql_text like ' select * from dual% ';ADDRESS hash_value sql_id command_type PIECE sql_text---------------- ---------- ------------- ------------ ---------- --------------------------------------

JVM tuning is primarily for heap memory, where heap memory is divided into: new, old, and permanent areasThe permanent zone stores the interface and class metadata of the system JDK itself, so only the new and old-age areas have optimized space.New District: Eden Area and survivor area. All the classes were new in the Eden District, and the survivor Zone was divided into 0 and 1 districts. When the space in the Eden area is exhausted,Garbage Collectio

Tags: ATI latest sel Opening technical file reference tis onlineNow has been doing the project, the amount of data is relatively small, at the beginning of the time did not feel, because it is just beginning, the amount of data is very small, in the process of the use of speed is very fast, but with the constant growth of data volume, found that the program is more and more slow, even the problem of timeouts, so to the program Early project is relatively tight, not for the Big Data volume busine

JVM Tuning ToolsJconsole,jprofile,visualvmJconsole: The JDK comes with a simple function, but it can be used with a certain load on the system. The garbage collection algorithm has a very detailed tracking. For more information, see hereJprofiler: Commercial software, you pay for it. Powerful. For more information, see hereVisualVM: The JDK comes with powerful features similar to Jprofiler. Recommended.How to TuneObserve memory release, collection cla

11 simple Java performance tuning techniques, java Tuning Most developers naturally think that performance optimization is complex and requires a lot of experience and knowledge. Well, it cannot be said that this is completely wrong. Optimizing applications to achieve optimal performance is not easy. However, this does not mean that you cannot do anything without such knowledge. Here are 11 easy-to-follow s