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Tags: Oracle execution plan set AutotraceCont.: http://blog.csdn.net/bisal/article/details/389191813. Autotrace SwitchOpen the autotrace switch in sqlplus to get the SQL execution plan.From the tip you can see that Autotrace has several options:Off/on/traceonly/explain/statistics.Experiment:1. Perform set AUTOTRACE on:2. Execute set AUTOTRACE traceonly:3. Execute set AUTOTRACE traceonly EXPLAIN:4. Execute set AUTOTRACE traceonly STATISTICS:autotrace S
It is impossible to build a house without a carefully drawn design plan. If the building is a kennel, although the plan may not need to be so detailed, but still need some sketches, to be aware of. Software development is completely different, and its "Design Plan" (planning) must be exhaustive and complete. For a long time, people don't have much structure in t
Tags: des int file c COM dataIn Oracle database operations, why is it that sometimes a field in a table is indexed, and when the execution plan of some language is observed, it does not go through the index? How to solve it? In this article we mainly introduce this part of the content, then let us come together to understand.OneThere are several reasons why the index does not go:The way you use the instance level is all_rows.Statistics for your table
Label:Business background:In order to facilitate the timely automatic updating of the SAP library data and reduce disk space. So you want to automatically back up and delete the data in SQL. This makes it easier for administrators to manage and reduce the workload of administrators.Solution Ideas:In 2005 SQL environment, create automatic backup and automatic deletion.Solution:1. Click "Manage", select "Maintenance Plan", right click and select "New Ma
Parameter sniff is encountered in parameterized SQL writing in SQL Server, which leads to the rapid solution of unreasonable execution plan reuse. parametersniff Parameter sniff is an execution plan generated by reusing other parameters. As a result, the current parameter uses this execution plan for non-optimization. Everyone familiar with the data should know t
Tags: data form schema display Ted optimize occupancy data dictionary OraPrior to the 11g version, the stored outlines (SQL Profile) feature was provided to save the SQL execution plan. In 11g, a new feature SQL plan management (SQL Management) feature was introduced to save SQL performance. The database automatically controls the evolution of the SQL execution plan
The problem is as follows: In the test process, the test plan is the arrangement of the entire test activity, while the test case is the guidance of the test execution. However, at present, many testers still do not realize the importance of the test plan and test case. In the case of tight project time, the plan and use case often become something of the form, w
query" function, in the end what can be done. A man who does not fight and the temple is a winner is more than a man, but he who does not fight and the temple is counted is less. More than a win, less than the bright, not counting? I take this view, the outcome of the victory see. , said grandson. "The Art of war" must have been studied as a child, we all know that before the battle, carefully discuss the plan of war, fully measure the favorable cond
Project Development Plan (GB856T--88)1 Introduction 1.1 Purpose of writingA project development plan is a preliminary plan that is first done to identify the project to be developed. There is a relatively general understanding of the conditions required for the entire development process of the project. Project development pl
Auto: http://kenchell.blog.163.com/blog/static/26088309200941035417557/ I was useless when I first started using SQL Server.Show execution planTo analyze the query. I have always thought that all the SQL queries I submitted are optimal, while ignoring the query performance, so I did not pay enough attention to the "Execution Plan. At the early stage of my career, I was very happy to get data without considering how the data was returned. The "Exe
I was useless when I first started using SQL Server.Show execution planTo analyze the query. I have always thought that all the SQL queries I submitted are optimal, while ignoring the query performance, so I did not pay enough attention to the "Execution Plan. At the early stage of my career, I was very happy to get data without considering how the data was returned. The "Execution Plan" worked on my querie
The Dbms_xplan package includes a series of functions, primarily for displaying the execution plan of the SQL statement, and using different functions to display in different situations, such as an estimated execution plan usingThe display function, while the actual execution plan is using the Display_cursor function, the Display_awr function is used for the exec
As the saying goes: everything goes wrong. Software testing also requires the development of corresponding testing plans at the beginning of the testing project. Next we will discuss how to compile the test plan. I. First, I want to know the following questions: 1. Why write a test plan? 1) The lead is able to make macro adjustments and configure corresponding resources according to the test
Original: http://www.oracle.com/technetwork/issue-archive/2009/09-may/o39asktom-096149.htmlhow a constraint (constraints) in Oracle affects the query planOften people think that constraints are just about data integrity, no problem. But constraints are also used by the optimizer to optimize the execution plan.The optimizer takes the following resources into the most input inputs:1) queries to be optimized2) All database object statistics3) System statistics, if available (CPU speed, single-block
Label:In this issue of performance Tuning training , I would like to discuss in detail the plan cache and its side effects in SQL Server. As you learned last week, each logical query that is submitted to SQL Server is compiled into a physical execution plan. The execution plan is then cached, known as the plan cache ,
When SQL server receives any command, including query, batch processing, stored procedures, triggers, pre-compiled commands, and dynamic SQL Server statements, it must complete Syntax Parsing and semantic analysis, then, compile the program to generate an executable plan ". During compilation, SQL Server estimates possible execution plans and their costs based on the architecture, statistics, and specific instructions of the objects involved, finally,
As the saying goes: Everything pre-standing, not pre-waste! Software Testing in the same way, at the beginning of the test project to develop a corresponding test plan . Next talk about how to write a test plan.A Here are a few things to know first:1. Why write a test plan?1) The leader can do macro-adjustment according to the test plan, and allocate the correspo
Label:Understand several Concepts first: Table scan, clustered index Scan, clustered index lookup, index Scan, bookmark lookup. "View Execution Plan" Before you understand the concept, you need to know how to view the execution plan-ctrl+l. Such as: NOTE:SQL Server execution plans are viewed from right to left. " Understanding several concepts" 1. Table Scan: occurs in the heap table, and when no availabl
Lesson five language Small Talk (1) Guide before class This lesson in the connecting link, for the future study to make some bedding. After defining the teaching plan, the data type and dynamic language are briefly introduced, and some opinions about the programming language are commented. This lesson is divided into four sections-- Teaching Plan--the next story Data types--rules and workarounds Dynam
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