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In Sqlplus we generally use the autotrace to view the execution plan, which performs the process analysis for some statements and optimizes the work. Here's a demonstration of how to grant Autotrace permissions to a normal user, taking the Scott user as an example (set autotrace on;)Tools/raw Materials sqlplus SSH Linux methods/steps1. Log in to the Scott user and verify that Scott has autotrace permissions.Enable Autotrace feature: To SYSDBA u

Tags: bin sele history AC Ash art Line LAN LetSometimes we query Gv$sql to see some running details for the same SQL different child cursors:Selet T.inst_id,t.sql_id,t.child_number,t.plan_hash_value,t.last_active_time,t.elapsed_time/100000/decode ( t.executions,0,1,t.executions), t.elapsed_time/1000000,t.executions,t.sql_text from Gv$sql t where sql_id= ' xxx 'Through the above query if it involves the same SQL operation information is very different situation, basically go to the corresponding

Label:The buffer sort in the Oracle execution plan is not actually sorted, just loading the data into memory and not scanning multiple tables.--Manufacturing datadrop table test Purge;drop table Test1 Purge;CREATE TABLE Test as SELECT * from Dba_objects where rownumCREATE TABLE Test1 as SELECT * from Dba_objects where rownumCREATE INDEX ind_t_object_id on test (object_id);Create INDEX ind_t1_object_id on test1 (object_id);exec dbms_stats.gather_table_

Tags: step advance. exe execution plan des table output Ted Order--SQL Execution timeSelect a.executions,a.elapsed_time,a.elapsed_time/a.executions/1000/1000 as seconds, A.sql_id,a.hash_value,a.address,a. Sql_text from Gv$session B,gv$sql a where a.hash_value=b.sql_hash_value and username in (' zlcftpub ', ' Zlcftuser ') and Statu s= ' ACTIVE ';0nx7fbv1w5xg20nx7fbv1w5xg2 Select Sql_id,a.* from Gv$session a where username in (' zlcftpub ', ' Zlcftuser

This article transferred from: http://jingyan.baidu.com/article/6b97984d9a26ec1ca3b0bf77.htmlsql2008 plan to automatically create a database partitionFixed incremental data that automatically creates a partition job.Step one: Create a scheduled task for the partition Open MsSQL2008, locate the job, if it is not open, or if SQL Server Agent is not started, start SQL Server Agent in the Windows service (see picture). Right-click the job in the MsS

by the time it takes to master it, and you need to take the time to master it. I would say the best reason to study vim is that you enjoy the process of spending time learning to master a complex skill. In this sense, this is no different from the mindset of people who want to learn a new instrument. If you think the reasons listed above are attractive, you can follow the four-week plan listed below to learn vim. This is the way I used to learn vim,

Consider this situation: In most of the time, your stored procedures run well, but sometimes very poor, performance seems to have fallen from the ground up. Some people may say that the statistics are not updated in a timely manner, when you run it manually and view the execution plan, you will find that there is a big gap between the estimated number of rows and the actual number of rows, therefore, it is determined that the statistical information

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

ORACLE Execution Plan Analysis1. What is an execution plan? An explain plan is a representation of the access path that is taken when a query is executed within Oracle. Ii. How to access data At the physical level Oracle reads blocks of data. the smallest amount of data read is a single Oracle block, the largest is constrained by operating system limits (and mult

Develop a successful test plan World Business comments icxo. com (date) To do their best, you must first sharpen your tools ". Professional tests must be based on a good test plan. Although each step of the test is independent, there must be a test plan that acts as a framework structure. The test

is often caused by a problem in the selection of methods, tools or technologies. Estimation:The workload deviation or scale deviation allowed by the project is generally about 20-30%, while the progress deviation is generally stricter. Therefore, it is best to make an estimation accuracy of more than 80%, if the estimation is inaccurate, the progress plan will be adjusted frequently in the future. project management or planning is an incremental pro

Oracle Execution Plan Analysis 1. What is an execution plan? An explain Plan is a representation of the access path that is taken when a query is executed within Oracle. Ii. How to access data At the physical level Oracle reads blocks of data. the smallest amount of data read is a single oracle block, the largest is constrained by operating system limits (and mu

During the optimization of the query statement during the tuning process, the execution plan of the analysis statement is the only way, and a good execution plan analysis tool can really help us to do more.tip : Plan Explorer is the new, completely free version of integrating Plan Explorer Pro with the free edition. Mi

Tags: explain autotrace statistcis level Dbms_xplan 10046tracegets the execution plan6kind of Method1. explain plan for acquisition;2. set autotrace on ;3. Statistics_level=all;4. Direct Access via dbms_xplan.display_cursor input sql_id parameters5. 10046 trace trace6. Awrsqrpt.sqlApplicable occasions Analysis1. If a SQL executes for a very long time to produce results , even if it is too slow to return the results, then the execution

To understand the execution plan, you have to understand it, the various nouns. Since I don't know much about it. This article is intended as a write-only, do not understand the understand before writing.At the beginning, it is important to note that the first time you look at the execution plan, theSQL Server Execution plan is viewed from right to left. Noun Ana

Label:Original: Understanding of SQL Server Execution planTo understand the execution plan, you have to understand it, the various nouns. Since I don't know much about it. This article is intended as a write-only, do not understand the understand before writing. At the beginning, it is important to note that the first time you look at the execution plan, theSQL Server Execution

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

The following articles mainly summarize the practical application skills of the Oracle explain plan. If you need to optimize the SQL statements in the Oracle database, we need to know the relevant plans to be executed, so as to make targeted adjustments. There are several methods to obtain the Oracle execution plan, which will be summarized below. 1. Use of EXPLAIN Every SQL statement executed by the Oracle

Someone recently proposed to view the Postgresql execution plan. The following describes how the cost and other related values in the PG execution plan are calculated:PG version 9.1.21. Use the terminal tool PGADMIN to press F7 to execute the statement, and then view the data output and explanation. 2. Command Line Analysis: explain select * from table_name;Generally, we will pay more attention to the cost

Tags: official study www tar cut show execution mat styleSQL Server execution planning (execution plan) Introduction Outline: Objective to describe the approximate use of execution plans in SQL Server, which can be useful when a query performance bottleneck is encountered, and with a more detailed learning document and plan, which the reader can follow as I plan