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Always want to find some of the authoritative reference for SQL statement performance debugging, but there is no reference may not be able to do the debugging work. I am convinced that the experience gained in practice is the most precious, and that book knowledge is only a guide. This article is from "Inside Microsoft SQL Server 2008", the experienced master despite the shooting brick.This section explains some of the performance analysis tools that are focused on the execution plan.Cache Execu

Always want to find some of the SQL statement performance debugging authoritative reference, but there is no reference may not be able to do debugging 2 of the work. I am convinced that the experience gained in practice is the most precious, and that book knowledge is only a guide. This article is from "Inside Microsoft SQL Server 2008", the experienced master despite the shooting brick.This section explains some of the performance analysis tools that are focused on the execution plan.Cache Exec

Tags: Oracle execution plan Dbms_xplanThe execution plan of SQL actually represents the specific execution steps of the target SQL within the Oracle database, and as a tuning, only know if the execution plan chosen by the optimizer is the best execution plan in the current situation, then we can know the direction of t

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 plan.I. What is the implementation

To improve the efficiency of database operation, we need to hit the execution plan as much as possible to save the running time. To improve the efficiency of database operation, we need to hit the execution plan as much as possible to save the running time. 1 Overview The essence of SQL is a series of pseudo-code, which expresses what is done, not what it means. Like other languages, SQL statements mus

Label:Recently often see the word "parameter sniffing", read a few articles, so I try to do a test to deepen the impression! Go to the official website to download the database: AdventureWorks2012 Direct Test it! Find a few familiar tables to associate with, Use ProductID as a condition to find two IDs returns a value that has a large difference in the number of rows. productid=870 (4688 lines) productid=897 (2 lines)"Test One"---First empty the plan

The original name of this chapter is master scheduling, and the direct translation should be the main schedule or something else, but it feels better to compile the main plan. Overview After the production plan, the next step of the MPC is MPs (Master Production Schedule). In this chapter, the analysis is to be considered in the preparation and management of MPs. MPS is a very important planning tool for co

SQL Server execution plan cache (1) Overview Understanding the execution plan is very important for database performance analysis. It involves statement Performance Analysis and storage. This is also the purpose of writing this article. Before learning about the execution plan, you must first understand some basic knowledge, therefore, some concepts mentioned ea

It is often said that the business plan (Business) is the "stepping stone" for start-up financing. As a large number of start-up enterprises to finance the growth of the necessary documents, its role as a pre-listed company's prospectus, is a financing company or project to make a statement and analysis, to facilitate the potential investors to conduct a comprehensive understanding of the investment object and preliminary examination of the text file.

Label: Overview Adaptive Connection Method Ajm AJM Example Process flow of AJM Adaptive parallel allocation Method APDM APDM Example Process flow of APDM About allocation methods Summarize Reference OverviewWe know that before the 12c version, although the ACS, CFB and other functions by collecting information during the SQL text execution, to improve the execution

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

Label:How to read Oracle's execution planFirst, what is the implementation planAn explain plan is a representation of the access path, that's taken when a query is executed within Oracle.Second, how to access dataAt the physical level Oracle reads blocks of data. The smallest amount Ofdata read is a single Oracle block, the largest are constrained by OperatingSystem limits (and Multib Lock I/O). Logically Oracle finds the data to read byusing the foll