oracle query optimization tool

This article describes the Oracle performance optimization tool, Oracle database online data dictionary, and the performance evaluation details of the Oracle Performance Optimization System, for administrators to refer to their ow

I. Operator Optimization 1. In Operator SQL statements written in are easy to write and understand, which is suitable for modern software development. However, SQL statements using in always have low performance. The following differences exist between SQL statements using in and SQL statements without in: Oracle tries to convert it to the join of multiple tables. If the conversion fails, it first exe

AWR Introduction to Performance optimization ToolsThis article mainly introduces oracle10g new awr tool, I often need to use AWR for database performance optimization and fault diagnosis in my work. AWR (Automatic workload Repository) is a new tool for collecting database statistics from

powerful tool 36Learn more from data dictionary 38DBA work Note of yangtingkun (by Yang Tingting) 45Use SQL to explain a magic 46 . ORA-600 (17069) Error solving process 47V $ diagnosis of exceptions in the SQL view Result 51Error parsing for Stored Procedure ORA-4068 54Diagnosis of a network connection error 57Talking about the features of job and database link 58One ORA-01041 error diagnosis 60Analysis of an ORA-604 error 61ORA-7445 (kdodpm) Error

With the continuous development of network applications and E-commerce, the number of visits to various sites is increasing, how to make limited computer system resources for more users. How to ensure the user's response speed and quality of service. These problems are within the scope of server performance optimization. As a more successful database vendor, how is the performance optimization of

Tags: add scan appears stat sorted MySQL optimization SLA featured OTAThe log is the same as people write diaries, record the past things. But the diary of a person is subjective (remember what you want to remember), and the database log is objective, according to the record content is divided into the following several kinds of log (technical article): A, error log: Records the issue that occurs when you start, run, or stop mysqld. B. General log: Re

Webmaster Network (admin5.com) December 4 News, today Baidu Webmaster platform release announcement, after the beta version and upgrade after the test, Baidu Webmaster Platform search Keyword query tool officially open. Webmaster only through the site verification, you can use the tool to query keyword data. Search key

Recently, I have been getting familiar with MySQL and it is imminent to understand how to optimize it. To do this, you must first sharpen the tool. Recently, I plan to learn about several frequently used tools to optimize MySQL. Today, I will give a brief introduction to EXPLAIN.Content navigation Id Select_type Table Type Possible_keys Key Key_len Ref Rows Extra Prepare the MySQL version in the environment: Create test table auto_increm

Seo tool set for Search Engine Optimization GOOGLE 排名监测工具下载http://www.cleverstat.com/google-monitor.htm查询关键字使用频率工具http://inventory.overture.com/d/searchinventory/suggestion蜘蛛模似器http://www.webconfs.com/search-engine-spider-simulator.php关键词密度检查http://www.seotoolkit.co.uk/keyword_density_analyser.asp链接流行度 Link Popularity Checker http://www.seotoolkit.co.uk/link_popularity_checker.aspPR值查询工具http://www.web

Instance analysis ORACLE database performance optimization, instance analysis oracle ORACLE Database optimization methods differ greatly from those of MYSQL. Today, an ORACLE database instance is used to analyze how to optimize

Tags: integer table can also be between output UI sha off row migration[ Oracle-based SQL Optimization ] Oracle-based SQL optimization "Bo Master" Gao Ruilin "Blog Address" http://www.cnblogs.com/grl214 A. Written Intent Description In the early stage of the system development, due to les

Tags: type error associated recommendation management will rom Ora no(Transferred from http://blog.csdn.net/sforiz/article/details/5345359) We have to do not only write SQL, but also to write good performance of SQL statements.(1) Select the most efficient table name order (valid only in the rule-based optimizer):The Oracle parser processes the table names in the FROM clause in a right-to-left order, and the FROM clause is written in the final table (

spent on each step and the CPU and block Io, so that we can optimize the query statement more specifically. As you can see, because this is a full-table scan, the most time-consuming here is on sending data. In addition to this scenario, the following situations can also be time consuming:converting HEAP to MyISAM (when the query results are too large, put the results on disk),create TMP table (creating a

optimization of algebraic optimization and access path, the statement is processed by the precompiled module and the query plan is generated. It is then submitted to the system for execution at the right time, and the execution results are returned to the user at the end. In the high version of the actual database products, such as

Tags: mysql massive dataMany programmers think that query optimization is the task of the DBMS (Database Tutorial management System), which is not related to the SQL statements written by the programmer, which is wrong. A good query plan can often improve the performance of the program by dozens of times times. A query

Author :? SHOUG Member-Luo Min, ORACLEACS Senior Consultant, asked questions and demands: "Does your Oracle company have such an automatic SQL statement scanning tool? Using this tool, we can import our application software to eliminate most of the SQL statements. In this way, we can reduce the workload of testing and performance

Slow Query Optimization of MySQL is a common topic. This article describes the actual problems encountered in the production database and provides examples. Enable slow query supportFirst, activate the slow query log, modify the my. CNF configuration file, and add the following options:Log-Slow-queries = slow. LogLong_

the create table as select (CTAs) syntax of Oracle to copy tables.. Oracle9i built-in table reorganization ToolBelow, we will look at the optimization of the following SQL statements. SQL OptimizationOracle SQL optimization is a complex topic, and even requires the entire book to introduce the nuances of Oracle SQL

Oracle SQL query optimization for Oracle Data Scanning (2) 2. How to improve the performance of local range data scanning: 2.1 category and role of query conditions: When we initiate a SQL statement with conditions, multiple query