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Mo Ge: my business plan, Mo Ge: Business Plan [Mo Ge: 1 million articles per day] A few days ago, Qin da wrote an article titled "Qin Gang: how to write a business plan with sufficient weight". In this article, he suggested that whether you raise funds or not, you should write such a business plan, because it gives you

Create your own oracle interpretation plan and 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

Cost Calculation Method in execution plan, execution plan cost Concept: Blevel: Binary Height = index height-1 Clustering_factor: Cluster factor, number of blocks in the table to be scanned after index scan, clustering_factor Index scan calculation formula:Cost = Blevel +Ceil (leaf_blocks * Valid tive index selecti.pdf) + Ceil (clustering_factor * Valid tive table selecti.pdf) The test is performed unde

Oracle Partition Table execution plan, oracle execution plan Partition tables have many advantages: they are big, small, and small. With parallel use, loap can often improve the performance by dozens or even hundreds of times. Of course, poor table design can also be counterproductive, and the effect is worse than that of normal tables. To better use a partitioned table, let's take a look at the execution

Tags: factor auto-generated program development OTA UI Images customer plan When doing a patrol on an Oracle server, using the following SQL to find the highest disk_read top SQL analysis, there are some anomalies in the parsing process that have an SQL statement, which makes people feel strange: SELECT sql_id, Look at the estimated execution plan for SQL in SQL developer and find that the executio

Tags: arc requires IDE number Server index execute execution plan log The source of this article: http://www.cnblogs.com/wy123/p/6008477.html For statistics on the number of rows of data estimates, previously written on the non-related columns (separate or separate index columns) of the algorithm, refer to here. 　　Today, let's write the statistical information on the calculation methods and potential problems of the composite index at the time of est

Inaccurate MySQL execution plan-Overview, mysql execution plan The execution plan for the Mao MySQL optimizer is often inaccurate, but not optimal (cpu + io )??? Too many factors :: The information of information_schema is regularly refreshed. In many cases, it is not the most authentic, or even the difference is very large (when it is not a mountain peak, make

There are many ways to view execution plans. I will introduce them one by one in my blog in the future. This article describes the first method. You can use the explain plan command to view the execution plan.1. log on to the database with an hr user[Oracle @ ENMOEDU ~] $ Sqlplus hr/oracle @ ENMOEDUSQL * Plus: Release 11.2.0.3.0 Production on Thu Apr 10 00:11:00 2014Copyright (c) 1982,201 1, Oracle. All rig

Physical plan generation process The optimized logical execution plan is logtophytranslationvisitor processed to generate a physical execution plan. This is a classic Vistor design pattern application scenario. Where the Logtophytranslationvisitor visit () is the entry method, through Dependencyorderwalker traversal handles each logicalrelationaloperator in

Framework Plan essay I. Background and vision, Framework Plan essay vision It has been 11 years since I registered my blog. In fact, I forgot how I registered my blog. Afterwards, I never remembered writing my own blog. Recently, I am working on my own architecture plans, and I am gradually guiding the back-up for coding, and I plan to write my own. net-based ORM

Explanation of MySQL execution plan, mysql execution planExplain syntax Explain select ...... Variant: 1. explain extended select ...... Decompile the execution plan into a SELECT statement and run show warnings to obtain the query statement optimized by the MySQL optimizer. 2. explain partitions select ...... Used to EXPLAIN the Partition Table Information contained in the execution

View the Oracle Execution Plan and the oracle execution plan1. PL/SQL explain Plan window Advantages: Disadvantage: limited information2. explain_plan It is easier to optimize a sentence.3. sqlplus Run the following command in Sqlplus: Set autotrace on Select * from emp; After the data is displayed, follow the execution plan: The advantage of this s

,Let's build this one. Index: CREATE index idx_col2_col3 on Teststatistics(col2,col3)Executes a query that is estimated to be 4127.86 rowsThen drop the index above and continue creating an index: Create index idx_col3_col2 on Teststatistics(col3,col2)Note that the order of COL2 and COL3 is inconsistentContinue execution of the above query (the query condition is unchanged, the data is unchanged, only the index column order has changed), this time is estimated to be 2414.91 row Query conditions,

To add, if you want to do a SQL automatic audit tool, where can I start?1, through the Sql*plus tool in the explain PLAN for judgment, the use of Dbms_xplan. Display displays.2, through the Sql*plus tool in the SET autotrace command display3, Sql_trace, in the database global (performance problem, is basically a waste of options), or to the current session definition Sql_trace, or use Dbms_system. Set_sql_trace_in_session gets the sql_trace of the oth

Label:When you create a new plan, remember that the execution plan requires the SQL Agent service (SQL Server Agent) to also open the Maintenance dialog box: "SQL Server has blocked access to the process ' dbo.sp_set_sqlagent_properties ' of component ' Agent XPs ' because this component has been shut down as part of this server's security configuration." SQL Server blocked access to the process ' dbo.sp_se

Content contained in the website construction plan: Key Points of the website construction plan The success or failure of a website has an extremely important relationship with the website planning before the website is built. Before establishing a website, you should clarify the purpose of website construction, determine the functions of the website, determine the website size, investment costs, and conduc

Team plan (4.20), team plan 4.20 Completion: Understand the as interface and basic functions Develop basic personal module plan And link: Run helloworld: http://jingyan.baidu.com/album/90895e0fce970264ec6b0bf2.html? Picindex = 5 As introduction to knowledge: http://blog.csdn.net/yanbober/article/details/45306483 Plan