bmc plan

Tags: parameter sniffThe parameter sniff problem is to reuse the execution plan generated by other parameters, leading to the non-optimization of the execution plan by the current parameters. Presumably familiar with the data of the students should know that the most typical problem of producing parameter sniff is the use of parameterized SQL (or stored procedures using parameterized), if there is uneven di

Label:Prior 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, with SQL plan ba

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

Tags: div flush condition Statement deployment put where count off1. Get an execution plan for SQL in PL developerEnter the target SQL for which you want to view the execution plan, and then press the shortcut key F5.2.explain Plan CommandExplain plan for + target SQLSELECT * FROM table (Dbms_xplan.display)3. Dbms_xpla

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

The parameter sniff problem is to reuse the execution plan generated by other parameters, which causes the current parameter to adopt a phenomenon that is not optimized for the execution plan. Presumably the students who are familiar with the data should know that the most typical problem of producing parameter sniff is to use parameterized SQL (or parameterized in stored procedures), and if there is uneven

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

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

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

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

For start-up risky enterprises, the business plan is particularly important. A brewing project is often vague. by formulating a business plan, both positive and negative reasons are written. I will repeat it one by one. Risk entrepreneurs can have a clearer understanding of this project. In this case, the business plan first promotes the enterprises to be created

In an Oracle database, the need to optimize the SQL statement requires knowledge of its execution plan, which is tailored accordingly. There are several ways to get Oracle's execution plan, and here's a summary 1, the use of explain Oracle RDBMS executes every SQL statement and must be evaluated by the Oracle Optimizer. So, understanding how the optimizer selects (searching) the path and how the index is us

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

test plans include: Create a test plan, version management, create a test plan to usePerform teststhe function. The test plan should include tasks that clearly define the time range and content. You can create a new version by changing the product requirements. It is recommended to use the Description field to correlate the document, the feature that needs to be