sql server query performance analyzer

distributed partitioned view on each server. The location of the data is transparent to the application. 11. Rebuild Index Dbccreindex,dbccindexdefrag, shrink data and log dbccshrinkdb, Dbccshrinkfile. Set the auto-shrink log. For large databases do not set the database autogrow, it will degrade the performance of the server. There's a lot of emphasis on T-

SQL Server CPU performance check and optimization related SQL statements, very good SQL statements, recorded here: -- Begin SQL related to CPU Analysis and Optimization -- use DMV to analyze statements that have used the most CPU

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

Original: SQL Server 2012:SQL Server architecture--The life cycle of a query (part 3rd) (end)A simple update queryYou should now know the query life cycle of reading only the data, and next determine what happens when you need to

Tags: MySQL index performanceTitleCREATE TABLE ' score ' ( ' id ' int (one-by-one) not null, ' studentid ' int (one) not null, ' subjectid ' int (one) NOT NULL , ' score ' int (one) not NULL, PRIMARY KEY (' id ') ) Engine=innodb DEFAULT Charset=utf8; --Create a new index to improve query performance of three SQL at the same time ALTER TABLE ' score ' ADD Inde

statement.In general, it is a relatively efficient way to use "small table driver Big table" when connecting between tables, that is, when loops join, loop the small table, drive the large table by loop, and then produce the query result set.The performance surface, which is caused by the order of the driving order between the tables, has a very significant improvement in

instances process:paging File Bytes to monitor the size of virtual memory The more data stored in virtual memory, the greater the difference between the amount of physical memory and the actual demand, the value is only as a reference value, and if it is close to 100% for a long time, then the system is likely to be abnormal. Second, monitor SQL Server usage of memory resources from the

types of index performance is not the same, should be used as far as possible first high-performanceThe index lookup efficiency of a numeric type is higher than the string type, and the index of fixed-length string char, nchar is higher than the variable-length string varchar, nvarchar.(inefficient) Select ... from tableName where Username= ' Zhang San ' and age>=21(efficient) Select ... from TableName where age>=21 and Username= ' Zhang San 'Second,

Comparison of paging stored procedures and performance of five types of SQL Server, SQL stored procedures In SQL Server database operations, we often use stored procedures to implement paging processing of the queried data to faci

TRIGGERCREATETYPECREATEOPERATORCREATEIndextypeTenrows selected. CHF@XFF>SELECTtable_name fromuser_tab_privs; no rows selectedCreate a CHF user, authorize Create Session,resource, no V$session,v$sesstat and v$statname view access, log in with Plsql Dev and query the User_tables table (no prompt at logon , only the user will be prompted when the query is executed or the related class is performed)Second, sol

Tags: blog http io os using AR java strong SPIndex of http://www.blogjava.net/allen-zhe/archive/2010/07/23/326966.html Performance optimizationRecent project needs, did a period of time SQL Server performance optimization, encountered some problems, but also accumulated some experience, now summed up, with June share.

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

: It can be seen that there is a clustered index PK_UserID and a non-clustered index IX_UserName. Look at the effect of creating a bookmarked search: Select UserName, Gender from dbo. UserInfo where UserName = 'usern600' According to the preceding SQL Execution Plan, a Key Lookup is generated, as shown in figure If you rewrite the preceding SQL statement Select UserName from dbo. UserInfo where User

successfully. To associate Indexing Service and SQL database: Execute the following stored procedure in SQL Query Analyzer (SQL Analyer) EXEC sp_addlinkedserver Dcs,--Connect the name of the server to the back of the

When you find a problem, determine whether it is a single query or a server problem. If all the programs on the server are slowing down and suddenly getting better, and each query slows down, then the slow query is not necessarily the cause, and conversely, if the

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