sql server query analyzer

horizontally split the table to reduce the table size (sp_spaceuse)3. upgrade hardware4. Create an index based on the query conditions, optimize the index, optimize the access mode, and limit the data volume of the result set. Note that the fill factor should be appropriate (preferably the default value 0 ). The index should be as small as possible. Use a column with a small number of bytes to create an index (refer to the index creation). Do not cre

find books, we generally use the way (the definition of parameters and data collection on the Assignment simulation page): 1 DECLARE @publishers VARCHAR (a); 2 SET @publishers = ' Tsinghua University Press ' ; 3 SELECT * from WHERE Publishers=@publishers The results are as follows: When the publisher filter condition is NULL, how do you write SQL? 1 DECLARE @publishers VARCHAR (a); 2 SELECT * from WHERE Publishers=ISNULL(@publishers, Publishers

Optimization of ms SQL Server Query Author: xmllover 2007-11-29 There are many reasons for slow query speed. 1. No index or no index is used (this is the most common problem of slow query and is a defect in programming)2. Low I/O throughput, resulting in a bottleneck effect.

;--current session process ID SELECT @ @textSize; SELECT @ @version;--Current database version information 9. System Statistic function SELECT @ @CONNECTIONS;--Number of connections SELECT @ @PACK_RECEIVED; SELECT @ @CPU_BUSY; SELECT @ @PACK_SENT; SELECT @ @TIMETICKS; SELECT @ @IDLE; SELECT @ @TOTAL_ERRORS; SELECT @ @IO_BUSY; SELECT @ @TOTAL_READ;--Read disk count SELECT @ @PACKET_ERRORS;--Number of network packet errors that occurred SELECT @ @TOTAL_WRITE;--sqlserver the number of disk writes p

It is understood that the vast majority of developers have a thorough understanding of indexing, limited to the fact that most daily work has no chance, and there is no need to care about or understand indexing, when a query is too slow, you can create an index based on the query conditions. When another query is slow, you can create an index, or directly send th

Label:SELECT B.deptname,A.badgenumber,A.userid,A.SSN,A.nameFROM dbo. USERINFO AINNER JOIN dbo. Departments B on a.defaultdeptid = B.deptidWHERE A.SSN is not NULLAnd b.deptid like '% ' Table ' USERINFO '. Scan count 1, logic read 278 times, physical read 0 times, pre-read 0 times.Table ' departments '. Scan count 1, logic read 4 times, physical read 0 times, pre-read 0 times. SQL Server Execution Time:CPU ti

Mysql SQL performance analyzer bitsCN. comauthor: skate Time: 2012/02/17 Mysql SQL performance analyzer The SQL performance analyzer of MySQL is mainly used to display the usage of various resources during

Source: http://www.cnblogs.com/doosmile/archive/2012/03/16/2400646.html--Connect remote SQL or insert data with OPENROWSET--if it's just temporary access, you can use OPENROWSET directly--query ExampleSELECT * FROM OPENROWSET (' SQLOLEDB ', ' SQL Server name '; ' User name '; ' Password, database name. dbo. Table name)

It is understood that most developers have a smattering of understanding of the index, limited to most of the daily work no opportunity, what is not necessary to care about, understand the index, it is really a query too slow to find the query conditions to build an index on OK, which day again a query slow, and then establish an index is, Or simply send the enti

If you want to query Index Server through SQL Server, you must use the OPENQUERY function. The syntax structure is as follows. OPENQUERY (pai_server, 'query ') The linked_server parameter indicates the connection name. The query p

Introduction In SQL Server, each query finds the shortest path to achieve its goal. If the database only accepts one connection, only one query is executed at a time. Therefore, queries must be completed quickly and easily. However, most databases need to process multiple queries at the same time. These queries will n

] ( [ID] [int] IDENTITY (1, 1) not null, [UnqValue] [uniqueidentifier] not null, [IntValue] [int] NOT NULL ) ON [PRIMARY] GO Alter table [dbo]. [tabTest] WITH NOCHECK ADD CONSTRAINT [PK_tabTest] PRIMARY KEY CLUSTERED ( [ID] ) ON [PRIMARY] GO Alter table [dbo]. [tabTest] ADD CONSTRAINT [DF_tabTest_unqValue] DEFAULT (newid () FOR [unqValue] GO Create index [IX_tabTest_unqValue] ON [dbo]. [tabTest] ([unqValue]) ON [PRIMARY] GO Declare @ I int Declare @ v int Set @ I = 0 While @ I Begin Set @ v

= @ I + 1 End Then we execute two queries and view the execution plan. (The query plan can be opened in the query menu of the query analyzer. At the same time, The GUID of the first query on the graph is obtained from the database, you can set this paramet

the Name of the current Language. Select @ lock_timeout; -- returns the current lock timeout setting for the current session (MS) Select @ max_connections; -- returns the maximum number of user connections allowed by the SQL Server instance at the same time. Select @ MAX_PRECISION AS 'max Precision '; -- returns the Precision level used by the decimal and numeric data types. Select @ SERVERNAME; -- Name of

Myth 1. An index is established on a table and an indexed column is used at query time, and the index is bound to take effectFirst of all, it is wrong to make it clear that the SQL Server query optimizer is a cost-based optimizer that determines whether to use an index, what type of index to use, and which index to use

Label:Write in front: This is the first T-SQL query Advanced series article. But the T-SQL query step-up series is far from finished. This topic is advanced and I think it is because this topic requires some advanced knowledge as the basis. If there is any mistake in the article, please do not hesitate to correct me. T

Original address: http://www.cnblogs.com/lyhabc/p/3367274.htmlBefore reading this article, you can read the following article firstSQL Server's unique task scheduling algorithm "Sqlos"Task Scheduler for SQL Server Sqlos [go]Translated from:http://rusanu.com/2013/08/01/understanding-how-sql-server-executes-a-

Tags: index solution based on keyword har results in SQL Server failure efficiencyProblem: There's a lot of data on both tables. The A1 field in a table needs to be associated with the B table primary key query A1 field stores multiple B table primary keys The format is: Format 1:B1,B2,B3 Format 2:B4 Format 3:b5,b6 Comma-delimited minority This leads to the use o

Tags: static void Main (string[] args) {string table name = "Water_emstime"; String sql = "Exec gettableselect" + table name; String constring = "Server=xxx.xxx.xx.xx;database=newfw;uid=sa;pwd=sa"; SqlDataAdapter da = new SqlDataAdapter (SQL, constring); DataSet ds = new DataSet (); Da. Fill (DS);

Label: CREATE VIEW View_1--Create a new view name as--functions for building viewsSelectStudent.sno,sname,cno,degree fromStudent join score on student.sno=Score.sno GoSelect* fromView_1wheresno='1' Select* from (SelectStudent.sno,sname,cno,degree fromStudent join score on STUDENT.SNO=SCORE.SNO) asTable2 wheresno='101'--define as a temporary table with AS and then query the results from the table. is also a sub-qu