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SQL optimization (SQL TUNING) 10-minute completion of billions of data volume performance optimization (SQL tuning)

Tags: ash text results SQL tuning SRC completion need to end TunA few days ago, a user developed QQ to find me, as follows:The free Dolphin. 16:12:01The island owner, my SQL can not find the results, could you help me see?Orchid Island Main 16:12:10How long is the result?The Free Dolphin 16:12:17How long has not produced the result, has not seen the result.Orchid Island Main 16:12:26Oh, good.Orchid Island M

SQL statement to query the SQL Server name and IP address, SQL Server

SQL statement to query the SQL Server name and IP address, SQL Server Get Server Name: SELECT SERVERPROPERTY('MachineName')select @@SERVERNAMEselect HOST_NAME() To obtain the IP address, run the ipconfig command in xp_cmdshell: -- Enable xp_cmdshell exec sp_configure 'show advanced options', 1 reconfigure with override exec sp_configure 'xp _ cmdshell', 1 reconf

SQL statement to query the memory usage of SQL Server, SQL Server

SQL statement to query the memory usage of SQL Server, SQL Server SELECT type, -- Clerk type sum (bytes) as vm_Reserved_kb, -- reserved memory sum (bytes) as vm_Committed_kb, -- Submitted memory sum (awe_allocated_kb) as awe_Allocated_kb, -- the memory used after AWE is enabled sum (bytes) as sm_Reserved_kb, -- shared reserved memory sum (bytes) as sm_Committed_k

Oracle Advanced SQL (4) -- SQL column and column conversion topic 2, oracle -- SQL

Oracle Advanced SQL (4) -- SQL column and column conversion topic 2, oracle -- SQL [Previous topic] column-and-column conversion 1-Introduction to functions of aggregate and unaggregate Implementation case 1001: lufei1001 shanzhi1001 namei1001 qiaoba: 1001 lufei, shanzhi, namei, qiaoba typical row-column conversion: there are many ways to achieve this. Here, the

SQL reads XML, parses XML, SQL transforms XML into DataTable, SQL transforms XML into tables

DECLARE @ItemMessageXMLDECLARE @ItemTable TABLE(ItemNumberINT PRIMARY KEY, ItemDescriptionNVARCHAR( -)) SET @ItemMessage=N 'SELECTT.c.value ('(Lifnr/text ()) [1]','VARCHAR (+)'), T.c.value ('(Name1/text ()) [1]','VARCHAR (+)' ) from @ItemMessage. Nodes ('/receivablesinfos/receivableslist') asT (c)SQL reads XML, parses XML, SQL transforms XML into DataTable, SQL

SQL Date Time format conversion large complete, SQL plus minus one months, plus minus one day, SQL time format conversion.

Tags: Warehouse barcode management WMS System Barcode Warehouse Management Warehouse Location Management Wisdom Budweiser Inventory machine SQL Server Statements and Query results:Select CONVERT (varchar), GETDATE (), 0): 2006 10:57amSelect CONVERT (varchar), GETDATE (), 1): 05/16/06Select CONVERT (varchar), GETDATE (), 2): 06.05.16Select CONVERT (varchar), GETDATE (), 3): 16/05/06Select CONVERT (varchar), GETDATE (), 4): 16.05.06Select CONVERT (varch

SQL performance Real-time SQL monitoring feature (real-time SQL monitoring)

Label: Overview Conditions of Use Monitoring objects Ways to view real-time SQL monitoring results The following sub-packages for the Dbms_sqltune package Dynamic View Enterprise Managerem Related parameters Changes in each version Examples of real-time SQL monitoring use Reference OverviewThe

Rs. open SQL, conn, 1.3 and rs. open SQL, conn, are different from rs. open SQL, conn, 3, and 2.

I often develop asp, but I am not very clear about the detailed statements. Here is a brief introduction. Generally Rs. open SQL, conn, are used to read data. Modify data: rs. open SQL, conn, 1, 3 Delete data: You can directly delete data such as conn.exe cute ("delete * from new where id = 1. Rs. Open Syntax: rs. Open Source, ActiveConnection, CursorType, LockType Source is an

JDBC connects MySQL, executes SQL statements in bulk, or executes an SQL statement before executing an SQL statement

Label: conn =mysqljdbcutils.getconnection (); Statement PS=conn.createstatement (); Ps.addbatch ("Truncate Qb_showcount_asite_copy"); Ps.executebatch (); String Srcsql= "SELECT Convert" (Unhex (Hex (CONVERT (Community using latin1)) using UTF8) as Community, PID from Qb_menbercmmsets_list whe Re site=7 "; stmt=conn.preparestatement (Srcsql); RS=Stmt.executequery (); Above is the empty command that executes before the following SQL statement executes//

SQL Server uses T-SQL commands to query which tables in a database SQL statements

SQLServer how to use the T-SQL command to query a database in which tables, convenient table operations, need friends can refer to the next SQLServer how to use the T-SQL command to query a database in which tables, convenient table operations, need friends can refer to the next 1. query all tables in SQL: Select TABLE_NAME FROM database name. INFORMATION_SCHE

SQL Server database management common SQL and T-SQL statements

SQL Server database management common SQL and T-SQL statements 1. view the database version Select @ version 2. view the operating system parameters of the machine where the database is located Exec master .. xp_msver 3. view database startup parameters Sp_configure 4. view the database startup time Select convert (varchar (30), login_time, 120) from master .. sy

SQL connections (2) -- SQL Reading Notes, SQL Reading Notes

SQL connections (2) -- SQL Reading Notes, SQL Reading Notes Chapter 1 in SQL Learning Guide 1.4 outer connections In multi-table join, the connection condition may not match all rows in the table. For example, when the account table is connected to the customer table, the value of the cust_id column in the account tabl

SQL Union and UNION ALL operator \sql SELECT into statement \sql CREATE DATABASE statement

SQL UNION operatorThe UNION operator is used to combine the result set of two or more SELECT statements.Note that the SELECT statement inside the UNION must have the same number of columns. The column must also have a similar data type. Also, the order of the columns in each SELECT statement must be the same.SQL UNION SyntaxSELECT column_name (s) from Table_name1unionselect column_name (s) from table_name2Note: By default, the UNION operator chooses a

Ms SQL Server 2000 administrator manual series-30. Microsoft SQL Server Management

30. Microsoft SQL Server ManagementAutomatic Setting of SQL ServerDatabase Maintenance PlanSummaryUsing appropriate settings and performing routine maintenance tasks in the database is the key to optimizing the server. This chapter describes the special features about dynamic settings in SQL Server 2000, which simplify the procedure for setting databases. At the

Use the SQL Bak reader tool to view the content of the SQL Server backup file (you do not need to open SQL Server)

Sometimes we do notSQL ServerOr you do not have permission to connectSQL Server,However, we want to view the contents of the backup file. In this case, we can useSQLBak ReaderGadgets. When you cannot restore the database, you can use this tool to view the database version of the backup.BakFile Corruption can also be usedSQL Bak ReaderOpen. UseSQL bakreaderOpenMasterBackup File (for example ): In fact, you can find that the information isRestore filelistonlyAndRestore headeronly

MySQL statement optimization recommended MySQL export SQL statement MySQL Import SQL statement mysql how to write SQL

Select from t anywhere, replace "" with a specific field list, and do not return any fields that are not available20, as far as possible to use Varchar/nvarchar instead of Char/nchar, because the first variable long field storage space is small, you can save storage space, and secondly for the query, in a relatively small field search efficiency is obviously higher.21, try to use numeric fields, if only the value of the field is not designed as a character type, which will reduce the performanc

SQL Server database manages commonly used SQL and T-SQL statements

1. View the version of the database SELECT @ @version 2. View the machine operating system parameters of the database EXEC master.. xp_msver 3. View Database Startup Parameters sp_configure 4. View Database Startup time Select CONVERT (varchar, login_time,120) from master. sysprocesses where spid=1 To view the database server name and instance name print ' Server Name ... ...: ' + CONVERT (varchar (), @ @SERVERNAME), ". print ' Instance ....: ' + CONVERT (varchar), @ @SERVICENAME. @).,

How to use dynamic SQL in PL/SQL development _ MySQL

Abstract: In the PLSQL development process, the use of SQL and PLSQL can meet most of the requirements, but in some special circumstances, using standard SQL statements or DML statements in PLSQL cannot meet your needs. for example, dynamic table creation or an uncertain operation must be performed dynamically. This requires dynamic SQL. This article describes PL

Static SQL, dynamic SQL, and static SQL

Static SQL, dynamic SQL, and static SQL Static 1. Common MemberCommon members belong to objects.Call with object 2. Static membersStatic members belong to the classCalled by Class Name Class FenBi{Public int length; // common memberPublic string color ;//} Static keywords Static methods cannot contain common members. The common method can contain static members.

SQL Server uses T-SQL commands to query which tables in a database SQL statements

1. query all tables in SQL: Select TABLE_NAME FROM database name. INFORMATION_SCHEMA.TABLES Where TABLE_TYPE = 'base table' after execution, you can see the names of all tables created by yourself in the database. 2. query all tables and columns in SQL: Select dbo. sysobjects. name as Table_name, dbo. syscolumns. name AS Column_name FROM dbo. syscolumns inner join dbo. sysobjects ON dbo. syscolumns. id

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