oracle sql performance analyzer

of the author in practice. It is not only simple and practical, but also thought-provoking. It is a "treasure house" that is suitable for readers at all levels to study and explore... Unlike other similar books, this book not only covers a variety of common Oracle versions on the market, but also highlights the unique performance optimization features of each version. The book opens with a new perspective.

query analyzer knows the statistical distribution of each column, but do not know the Joint Distribution of several conditions, resulting in an incorrect execution plan, as shown in figure 6. Figure 6. Deviations caused by inability to predict the Joint Distribution As shown in figure 6, we can see that the estimated number of rows is greatly different from the actual number of rows, so we should use the table scan, but the query

Configuration process of maximum performance mode of physical volume uard Master Database Host edbjr2p1 Slave Database Host edbjr2p2 1. Create a master database [Root @ edbjr2p1 ~] # Xhost + Access control disabled, clients can connect from any host [Root @ edbjr2p1 ~] # Su-oracle [Oracle @ edbjr2p1 ~] $ Dbca The database creation process is omitted... ORACLE_SID

Tags: src class-o lib install QR code tables largest bin Nine easy steps to perform Oracle database performance testing 1) Copy the JDBC Driver jar package file (Ojdbc14.jar) from Oracle to the JMeter Lib directory. The Ojdbc14.jar file is typically located in the Jdbc\lib directory under the Oracle installation direct

Chapter 2 procedural performance tuning of PL/SQL applications I. Reasons for PL/SQL Performance problems When the execution efficiency of PL/SQL-based applications is low, it is usually caused by poor SQL statements and prog

Oracle performance analysis 6: Index scanning of data access methods, oracle Index This section describes various index scanning methods. After learning about the features of various index scanning methods, you can determine whether the scanning methods used in your execution plan are correct, you can also make improvements to the obtained information.Unique inde

Tags: style blog http color using SP strong on dataRecently a friend and I explored whether statements about where 1=1 and this form would affect performance. The final conclusion is not affected. Although the conclusion is correct, the understanding of the problem is far from the root of solving the problem. In fact, in the writing process of T-SQL statements often make a very narrow conclusion, and then d

that does not read data or execute plans, however, Oracle has provided a large number of built-in SQL optimization tools since 10 Gb. For example: ADDM, SQL Access Advisor, SQL Tuning Advisor, Automatic SQL Tuning, SQL Profile, S

Oracle Performance Tuning-Beyond OCP proficient Oracle Video tutorial Training 38Course IntroductionWind Brother Oracle Video tutorial , operating system optimization tuning, storage System optimization tuning experience, database instance level tuning, SQL Statement Index o

time, and proper use of the index can greatly reduce the access data block and thus reduce the response time. The execution of the application ultimately boils down to the execution of SQL statements in the database, so the efficiency of the execution of the SQL statement determines the performance of the Oracle datab

With the continuous development of network applications and e-commerce, the access traffic of various sites is growing. How can we make limited computer system resources serve more users? How can we ensure user response speed and service quality? These problems all fall into the scope of server performance optimization. As a successful database vendor, How Does Oracle optimize its database

statistical distribution of each column, does not know the joint distribution of several conditions, resulting in an incorrect execution plan, as shown in Figure 6. Fig. 6. Due to the inability to predict the joint distribution, the deviations caused From Figure 6, we can see that there is a huge deviation between the estimated number of rows and the actual number of rows, so that the table scan should be used but the Query Analyzer chooses the