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retrieving, pushes the condition customer_id>=300 AND customer_id to the storage engine layer to complete the filtering, which reduces unnecessary IO access. Extra Using index condition uses ICP optimization as a representation.Reference"In layman's MySQL"The thing about the code.Public Number:Source: http://songwenjie.cnblogs.com/Statement: This article for Bo Master Learning sentiment Summary, the level is limited, if improper, welcome correction. If you think it's good, just click on the "re

Label:Command>host Ttxactadmin TtwindCommand>call Ttsqlcmdcacheinfo (135710768);2014-12-30 16:07:54.311/app/timesten/timesten/ttwind/info/datastore/ttwindTimesTen Release 11.2.2.7.0Outstanding locksPID Context transid transstatus Resource ResourceID Mode sqlcmdid NameProgram File Name:timestenorad9100 0x7fe5ac0811e0 8.2397 Active Database 0x01312d0001312d00 IX 0Table 1798032 W 10739348336 SCOTT. TblordersRow bmufvuaaaabaaaajbv S 10739348336 SYS. TABLESRow Bmufvuaaabhfqaaehm Sn 10739348336 SYS. C

Sub-query, also called nested query.A query statement is used as a result set for other SQL statements, just as a query statement that is treated as a result set is called a subquery, as with a normal table. There are two types of sub-queries:One is to return only a single-valued subquery, at which point it can be used where a single value can be used, when a subquery can be considered a function that has a return value;Another is a subquery that returns a column of values, at which point the su

file, and in this window select the database file (suffix) you want to attach . MDF) 4. Click " OK " button to complete the installation of additional database files, click the OK button to complete the database additional tasks. Statement: 1. Change the name of the database 2. Add columns, delete columns if there is data in the table 3. examples of the use of various query statements in SQL Server 4. The statement of the fuzzy query 5. sort statements, sort and check the top three stat

|--------------------------------------------------------------------------Query Block Name/Object Alias (identified byoperation ID):------------------------------------------------------------- 1 -sel$1 /Emp@SEL$1Outline Data------------- /*+ begin_outline_data Full (@ "sel$1" "EMP" @ "sel$1") outline_leaf (@ "sel$1") all_rows db_version (' 11.2.0.1 ') Optimizer_features_enable (' 11.2.0.1 ') ignore_optim_embedded_hints end_outline_data*/predicate information (identified byoperation ID

good one scheduled execution of the SQL statement task schedule. In addition, we can create a new job and pull the job into the maintenance plan after the new job is completed.SQL Server Agent-JobsNew job:Steps:New command:You can select a databaseWrite the SQL statement you want to execute, click OK, and the job is created. Then you can pull a job into the maintenance plan:Pull into Design view:Modify Job Task-click Edit-Select the job that we just added:Then click Finish to:This creates a job

　　White Cat Plan How to get the white statue? Players as long as the game through the small new level can get the system presented white statue , the player can be found in the town building in the "warehouse" to find small white statue Click can

I've been in touch with Linux for years, at least for 5 years. Recently the company is engaged in internal training, everyone can enroll in training others. Think of yourself in the Linux immersion for many years, should come out a force. Always

The Daily tasks are: 1 complete backup or differential backup of the database on a regular basis. 2 regularly clean up the backup files, because the storage space is limited, you may need to save only a period of time files (such as a week or

Topic From the title look, finally a bit into the feeling, is not it. Next Zed is going to teach us the simplest way to use a function. New Knowledge A function is a piece of code that can be run repeatedly, using functions to improve the reuse of

How to intervene in the execution plan--Using hints hints The cost-based optimizer is smart, and in most cases it chooses the right optimizer to ease the burden on the DBA. But sometimes it is clever to be mistaken, choose a bad execution plan, make

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first, the index MongoDB provides a variety of index support, the index information is saved in System.indexes, and the default is always to create an index for _ID, its index uses the basic and MySQL and other relational database. In fact, it can

Because the B*tree index does not store null values, some Oracle queries do not use indexes when the indexed field is allowed to be empty. Most of the time, it appears that we can use a full index scan, which may give Oracle the chance to discard

1 The easiest way is to log in with the Pl/sql tool, select the SQL statement, and then press F5; 2 with Pl/sql tool login, open command Window A) execution: Explain plan for SELECT * dual;--red part can be replaced with your SQL statement b)

SQLSETAUTOTRACEONSQLSELECTSYSDATEFROMDUAL; sysdate------------26- September-12 execution plan execution ERROR: anuncaughterrorinfunctiondisplayhashappened; pleasecontactOraclesupportPlease SQL set autotrace on SQL SELECT SYSDATE FROM DUAL; SYSDATE --

Ubuntu developers will soon be able to experience many improvements to the long-awaited UbuntuApp Development Platform SDK. JonoBacon of Canonical has shared some new details about developers working on platform acceleration in Florida last week,

& Nbsp; Source: CSDNOracle Technical Forum & nbsp ;: myepoch proposes that the same SQL statement has a huge difference in execution efficiency because of the retrieval value. Problem Environment: Oracle10g, tbnc_adminpowerscope table has B tree

According to foreign media reports, the European branch of the Free Software Foundation (FSFE) said on Friday that Oracle should hand over the MySQL database to an independent non-profit organization to allow the EU to approve Oracle's acquisition

Solution: recreate plan_table, SQLgt; droptablePLAN_TABLE; SQLgt ;@? After rdbmsadminutlxplan is completed, the problem is solved. Solution: recreate plan_table, SQLgt; drop table PLAN_TABLE; SQLgt ;@? /Rdbms/admin/utlxplan The generated