mevo plan

Cont.: http://blog.csdn.net/bisal/article/details/392253734.10046 EventsThe execution plan for the target SQL can also be viewed through the 10046 event. Events like 10046, which are not available in Oracle's official documentation, are typically used for debugging purposes, so they can often be used to find more detailed information about the problem. The difference between the 10046 event and the previous explain

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 must be compiled before they can be run. Therefore, each SQL statement must be interpreted by the compiler before it can be run (SQL optimization is required ). These steps all require running costs, so there is a thing in the database called the execution plan, the compiler will save the compiled SQL into the

1. What is the execution plan Anexplainplanisarepresentationoftheaccesspaththatistakenwhenaqueryisexecutedwithin 1. What is An explain plan is a representation of the access path that is taken when a query is executed 1. What is an execution plan? An explain plan is a representation of the access path that is take

Oracle constraints (constraints) affect the query plan, oracleconstraintsOriginal article: http://www.oracle.com/technetwork/issue-archive/2009/09-may/o39asktom-096149.htmlHow constraints in oracle affect the query planIt is generally considered that the constraints are only related to data integrity. However, the constraints are also used by the optimizer to optimize the execution plan.The optimizer takes the following resources as the most input inp

Source: What caused that "go horribly" wrong–should you update statistics? Since I did encounter such problems, but based on the level and experience, do not intend to repeat the wheel, so Daniel's article translated for your reference. The following is the translation: In the past few years, I have encountered such situations: There is a stored procedure that runs very well for most of the time, but suddenly it doesn't. There is a cliff-type decline in performance. You don't know why, but someo

My name Cai Wen, the old boy. Linux operation and maintenance of the first class - participants in the period. I plan to go through the old boys education Viban 5-6 months of study, to find a salary level 8-12k 's work. In order to achieve this goal, I will take the following actions: Class is not late, class does not leave early; The class listens earnestly, the positive and the teacher schoolmate interacts, earnestly, completes the work in ti

Linux Recurring Task plan detailedOne-time task execution: At,batchAtInteractive: Let the user enter more than one command to execute at the at> prompt;Batch processing: Writes the command of the task to the file by the at to call;Use format :At timeAt >CTRL+D: Submitting a task At jobs have queues : represented by a single letter View Job : At-l =atq [[email protected] ~]# at 10:46at> ls-ld/etcat>

ignore performance, which sees performance as something that can be handled at the end of a project, such as writing a release note or building an installer. The strategy is largely a matter of luck, because the computer is running faster than a year, so it can always cope with performance. This problem of luck (even when the odds of success is very high) is that when performance problems arise, you do not have the framework to deal with it, determine its root cause, or address it in a special

use the Internet radio function even if you don't turn on the Cool Dog Music Master program. Figure 2. Click on the radio program on the top left corner to open the menu This small and exquisite program is the cool dog music software with the Cool Dog network radio function, in order to achieve our regular recording function, now just click on the main interface of the upper left corner of the radio logo, in the Open menu can find the "recording

A, MMS platform Implementation plan 1. 1 Project Information 1. 1. 1 Project Scope The scope of the project requirements are: the construction of MMS platform to meet the news network, Newspaper group interaction, voting activities, readers feedback, MMS news materials, MMS information order and so on 1. 1.2 Construction Unit Newspaper group. 1. 1.3 Contractor Co., Ltd. qq:84401116 Tel 13950404552 1.2. Deployment Scenarios L Operating System: Using Mi

Start a server, is exactly the cloud host, the environment inside is pre-configured, but in the configuration planning tasks, but found that mssql2005 plan backup can not do, will error: Copy Code code as follows: SQL Server Create Maintenance plan failed (SQL server:14234 error) automatic backup database plan error message: Copy Cod

plan: >explainselectdeviceidfromt_aa_pc_logwhere pt= ' 2012-07-07-00 ' limit1; ok stagedependencies: stage-1 isarootstage Stage-0isarootstage stageplans: Stage:Stage-1 MapReduce Alias->MapOperatorTree: t_aa_pc_log TableScan alias:t_aa_ pc_log FilterOperator predicate: expr: (pt= ' 2012-07-07-00 ') type:boolean SelectOperator expressions: expr:deviceid type:string outputColumnNames:_col0 limit FileOutputOperator compressed: false Glob

the program steps, all columns inside the long tail keyword will determine your future development of the site. If your site is a portal class site, then the direction of optimization will rise to the homepage of the design scheme. 　　Second, the section page optimization plan 1, the website head design: The head design will include the title, keywords, and description, according to the specific circumstances, if it is the Enterprise Class site (sin

This white paper provides relevant content about scalability in different reporting service implementation architectures. Also provides guidelines, recommendations, and hints based on using Microsoft SQL Server Reporting services to complete your own performance tests. Brief introduction Microsoft®sql server™reporting Services is a reporting platform that includes scalable and manageable central management report servers and extensible web-based, desktop-based report delivery. Report service is

Pig syntax parsing based on ANTLR and generates a logical execution plan. The logical execution plan basically corresponds to the operation step one by one in the Pig Latin, arranged in dag form. The following code (reference Pig Latin paper at SIGMOD 2008) is an example of an analysis that includes common operations such as load, filter, join, group, foreach, Count functions, and Stroe. Pigserver pigser

Tags: style blog http color os using SP strong fileOriginal: Database backup of "MS SQL" Database maintenance plan (i)Before you make a database backup, be sure to hear: full backup, differential backup, incremental backup, transaction log backup ... and other words, the following illustration to illustrate.完整备份：A full database backup contains all the data in the database. For small databases that can be backed up quickly, the best approach is to use

Explain1. If first execution, please connect to dbname (under Dbinst user),Perform DB2-TVF $HOME/sqllib/misc/explain. DDL Build Execution Plan table2.DB2 Set Current explain mode explain (under the user of the database)is set to interpreted mode and does not actually execute the SQL command that will be issued below3. Execute the SQL statement you want to parse......DB2 "SELECT DISTINCT RTRIM (market_code), RTRIM (Currency_type), t.* from KS. Branch_p

Tags: blog http io ar os using SP strong fileexplain SyntaxEXPLAIN SELECT ... Variant: 1. EXPLAIN EXTENDED SELECT ... "Decompile" The execution plan into a SELECT statement, run show WARNINGS to get the query statement 2 optimized by the MySQL optimizer. EXPLAIN Partitions SELECT ... Explain for partitioned tablesInformation contained in the execution planIDContains a set of numbers that indicate the order in which a SELECT clause or action table is

On-premise SQL Server provides a maintenance plan to maintain SQL Server on a regular, scheduled basis. As a general rule, define SQL Server Agent jobs, and the maintenance plan helps us Execute SQL Server Agent jobs on a regular, scheduled basis. Unfortunately, SQL database does not provide maintenance plans and SQL Server agent functionality.However, according to MSDN, we can still connect to SQL Database

Label:What is a jobA job is a schedule that SQL Server executes at timed intervals.SQL Server Maintenance plan and job relationshipsA maintenance plan is a system-predefined job, such as a backup, restore database, and empty log maintenance plans.General tab Open the SQL Server database, click the SQL Server Agent, locate the job under the agent, and right-click the job to select new job.Steps to r