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the see several common methods of Oracle execution plan-Series 1(http://blog.csdn.net/bisal/article/details/38919181) This blog post has mentioned a hidden issue:" hidden Issue 2:This part of the experiment finds the use of select * FROM table (Dbms_xplan.display_awr (' sql_id ')), and there is no result, @ Yap says it is possible that AWR collects top SQL, It is possible that the test SQL is not the most intensive SQL, but I am using the ALTER syste

In most cases, upgrading your database to SQL Server 2008 can improve query performance. However, if you have mission-critical queries that have been carefully optimized for performance, it is a good idea to create a planning guide for each query before you upgrade to keep the query plans for those queries. If, after the upgrade, the query optimizer has selected a less efficient plan for one or more queries, you can enable these planning guides and fo

What can WPS do to help us? For teachers, the biggest benefit is to be able to change the pen: Use the computer shortcut word processing way to get rid of the traditional one strokes of writing lesson plan of toil. The teaching plan is designed according to the actual practice and the students, the electronic teaching plan and the paper lesson

The online SQL optimization article is really a lot of to be honest, I have also looked everywhere for such articles, what not to use in, what or, what and, many many, and many people come up with only a few s or even a few examples of the time difference of MS to prove what (a bit ridiculous), Let many people not know whether they are right or wrong. and SQL optimization is every programmer to deal with the database of the required course, so write this article, with friends. When it comes to o

Using a maintenance plan for SQL Server 2008 enables you to automatically back up the database and automatically remove the functionality of outdated backups.First, the environmentOs:microsoft Windows Server 2003 R2Soft:microsoft SQL Server 2008Backing up the database path C:\sql_bakSecond, the configurationLogin MicrosoftSQL Server Management studioà management à maintenance plan right-click: Create a new

Below tables contains contant you need to consider while planning for a CDB. Action Considerations for a CDB Additional Information Plan the tables and indexes for the Pluggable databases (PDBs) and estimate the amount of space they would require. in a CDB, most user data was in the Pdbs.the root contains no user data Or minimal user Data.plan for the PDBs, that'll be is part o

One, what is the implementation plan (explain plans) Execution plan: A description of the execution process or access path of a query statement in Oracle. Ii. How to view the execution plan1: Under Pl/sql press F5 to view the execution plan. Third-party tools Toad and so on. Many people think that Pl/sql's implementation

Follow this six-step malware response plan Follow the six-step malware response plan By Michael Mullins ccna, MCPBy Michael MullinsTranslation:Endurer Tags:Security threats | viruses and worms | spyware/adware | Security ManagementTags: security threats | viruses and worms | spyware/advertising software | Security Management Takeaway:Sometimes all the preventive care in the world won't protect your systems

References: Cache and reuse of execution plansRe-compile the execution plan Depending on the new status of the database, some changes in the database may cause the execution plan to be less efficient or invalid. SQL server detects changes that make the execution plan invalid and marks the plan as invalid. After that, y

Explain plan is a good tool for analyzing SQL statements. It can even analyze statements without executing SQL statements. through analysis, we can know how Oracle connects to the table, how to scan the table (index scan or full table scan), and the index name used. You need to interpret the analysis results in the order from inside to outside. the results of the explain plan Analysis are arranged in indent

Test Plan (GB8567--88) 1Introduction Testing is required when the project's basic code is completed, which plays an important role in troubleshooting and fixing vulnerabilities. 1.1Purpose The main purpose of the test is to find as many vulnerabilities as possible in the system, design test cases, and test the system. The purpose is to have a general control over the testing methods and procedures. This document is intended for testers. System Testin

Create your own 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 join method used by each data source to be joined; All operations to be comp

Plan Formulation and Implementation Wu Yu Taiyan Network Studio The National Day holiday went to Tianjin with a self-help tour. In the past, self-guided tours were all about how I designed the route, made a plan, and then made a transfer to an scenic spot, including how to transfer cars, what kind of transportation to take, where to eat, and what kind of food to eat. This time, because I am busy wit

Because the project I'm in touch with is web, it's a priority to start by creating a Web test plan.Official Tutorial Address:Http://jmeter.apache.org/usermanual/build-web-test-plan.htmlIn this section, we'll learn how to create a basic Test plan to test a Web site. You'll create five users that send requests to and the Jmeter Web site. Also, you'll tell the user to run their tests twice. So, the total number of requests is (5 users) * (2 requests) * (

Oracle execution plans are not unfamiliar to us, and often we only look at the performance bottlenecks in our work and have no idea how the execution plan is generated. The following examples are used to simulate the evolution of data access and data processing methods. 1. Execution plan-Accessing data table through tables access full Leo1@leo1> CREATE TABLE Leo1 as SELECT * from Dba_objects; We create a

Tags: des io ar os using SP for strong filesView Oracle several ways to execute a planFirst, through the PL/SQL Dev tool1. Directly file->new->explain plan window, execute SQL in the window to view the planned results. Where the cost represents the CPU consumption, the unit is n%,cardinality represents the number of rows executed, equivalent to rows.2, first execute EXPLAIN PLAN for select * from TableA whe

Oracle's execution planHow to get the plan executedAutotrace ExampleUsing explainExplain plan set statement_id= ' Testplan ' for select * from dual;Select Lpad (", 5* (level-1)) | | Operation operation, Options, object_name, cost,position from plan_table start with id=0 and statement_id= ' Testplan ' connect by prior id=parent_id;How to see the execution planUnderstand some of the knowledge you

After a long time learning Oracle, so share with you, after reading this article you certainly have a lot of harvest, hope this article can teach you more things. Each step of the Oracle execution plan returns a set of rows that are either used for the next step, or returned to the user or application that issued the SQL statement at the end. The set of rows returned by each step is called the row source (rowSOURCE). The tree chart below shows the flo

Task scheduling is a useful system management tool in both Linux and Windows operating systems. For example, you can schedule the task so that the operating system can automatically monitor the hard disk Task scheduling is a useful system management tool in both Linux and Windows operating systems. For example, you can schedule the task so that the operating system can automatically monitor the disk usage. Statistics are collected once a day. if the disk space is less than 5%, reports are automa