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The following execution plan is printed out. Many friends still don't know. In fact, there are only three statements: Explain plan for the SQL statement you want to view; commit; select * from table (dbms_xplan.display ); ----- Split line ---------------------------------- First, let us know a principle,When you look at the execution plan, start from the first l

Create a power plan what to choose To create a power plan is a timing function, such as how long we do not use the computer automatically into the screen saver or longer without the system automatically sleep state. How do I create a power plan? (Win8.1) 1. Click the "Start" option, as shown below.2. Select the "Control Panel" option to open the entry details

Create your own oracle interpretation plan and oracle interpretation plan 1. Explain the plan When an explain plan is used to generate an expected execution plan for a query, the output includes the following: Each table accessed by SQL; Method for accessing each table; The

Cost Calculation Method in execution plan, execution plan cost Concept: Blevel: Binary Height = index height-1 Clustering_factor: Cluster factor, number of blocks in the table to be scanned after index scan, clustering_factor Index scan calculation formula:Cost = Blevel +Ceil (leaf_blocks * Valid tive index selecti.pdf) + Ceil (clustering_factor * Valid tive table selecti.pdf) The test is performed unde

Basic elements (time, user, problem) the user in the 11G environment has a section of SQL statements in the program is very inefficient execution, but in plsql execution is very fast, by looking at the execution plan, found that the use of different indexes caused, the program executes the following:The effects performed in Plsql are as follows:You can see the difference, the use of outpatient expense records _IX_ Registration time index is the execut

After the contract is signed, the main purpose of this phase is to prepare a plan that has obtained the consent of the stakeholders of the main project, which has the correct big framework and can guide the project implementation, further improvement, adjustment and updating of the project plan is a continuous activity in the project implementation process. In addition to having sufficient project experienc

Mo Ge: my business plan, Mo Ge: Business Plan [Mo Ge: 1 million articles per day] A few days ago, Qin da wrote an article titled "Qin Gang: how to write a business plan with sufficient weight". In this article, he suggested that whether you raise funds or not, you should write such a business plan, because it gives you

Tags: factor auto-generated program development OTA UI Images customer plan When doing a patrol on an Oracle server, using the following SQL to find the highest disk_read top SQL analysis, there are some anomalies in the parsing process that have an SQL statement, which makes people feel strange: SELECT sql_id, Look at the estimated execution plan for SQL in SQL developer and find that the executio

Tags: arc requires IDE number Server index execute execution plan log The source of this article: http://www.cnblogs.com/wy123/p/6008477.html For statistics on the number of rows of data estimates, previously written on the non-related columns (separate or separate index columns) of the algorithm, refer to here. 　　Today, let's write the statistical information on the calculation methods and potential problems of the composite index at the time of est

Oracle Partition Table execution plan, oracle execution plan Partition tables have many advantages: they are big, small, and small. With parallel use, loap can often improve the performance by dozens or even hundreds of times. Of course, poor table design can also be counterproductive, and the effect is worse than that of normal tables. To better use a partitioned table, let's take a look at the execution

Physical plan generation process The optimized logical execution plan is logtophytranslationvisitor processed to generate a physical execution plan. This is a classic Vistor design pattern application scenario. Where the Logtophytranslationvisitor visit () is the entry method, through Dependencyorderwalker traversal handles each logicalrelationaloperator in

Label:Oracle-based application system many performance problems are caused by poor application SQL performance, so, SQL performance optimization is very important, analysis and optimization of SQL performance we generally look at the SQL implementation plan, this article on how to understand the implementation plan, And how to optimize SQL by analyzing the execution pla