sql server bottleneck analysis

SQL Server concurrent processing, update solution discussion, SQL Server Preface In this section, we will talk about the most common situation of concurrency, that is, update. If no row record exists in concurrency, insert it. At this time, it is very easy to insert duplicate keys, this article describes the seven solu

. Use failover Cluster Manager to verify and create the cluster. The cluster disk view after completion is as follows:ImageIi. Installing a SQL Server failover clusterAfter the Windows Failover Cluster (WSFC) build succeeds, the foundation for the SQL Server failover cluster is completed, and then we continue to comple

SQL Server 2000 T-SQL operation T-SQL (trantsact-SQL) is a structured query language developed by Microsoft on the basis of Sybase.ProgramAnd the tools for communicating and accessing stored procedures with SQL

in the current table to the backup table involves the not in and in operations: First, add 0.1 million pieces of test data CopyCode The Code is as follows: Create procedure adddata As Declare @ ID int Set @ ID = 0 While (@ ID Begin Insert into DBO. Info (ID, pname, remark, impdate, upstate) Values (@ ID, convert (varchar, @ ID) + '0', 'abc', getdate (), 0) Set @ ID = @ ID + 1 End Exec adddata Use not in and in operations:Copy codeThe Code is as follows: Set statistics time onGo-- Backup dataI

"Next". 11 Specify "Service Account" and "Collation", where default settings are selected. If you need to customize the configuration after completing the installation, click Next. 12 in the Database Engine configuration page, specify server configuration authentication as the default Windows Authentication mode, add current user as SQL Server administrato

compatible with the exclusive lock, as a result, Session C is also blocked, so Session C will also enter the waiting queue, after session B. Reasons for blocking Session C: It can be seen that when Session C changes the IU lock on Page 1: 21339 to the IX lock, the Session C is in the convert State without a grant, and the session C is to be modified, it is because the data with the id of 100000 needs to be modified. Previously, the IU lock was applied to 1: 21339 and the u Lock was applied to

, enhanced optimizer, and disk stripe. This performance improvement is adequate, but after all, the scope is limited. The fastest computers can also be paralysed by inefficient queries or poorly designed applications. Therefore, although the performance improvements allowed by SQL Server 6.0 are increased, it is important to optimize databases, indexes, queries, and application programming.If you focus on t

With regard to the use of SQL Server Profiler, there are already many tutorials on the web, such as this article: SQL Server Profiler: How to use and metrics. Microsoft Official Documentation: https://msdn.microsoft.com/zh-cn/library/ms179428 (v=sql.105). aspx is described i

RAID0, and SQL2000 is not supported. The larger the data size (size), the more important it is to increase I/O.2. vertical and horizontalSplit the table to reduce the table size.(Sp_spaceuse)3. upgrade hardware4,Create indexes, optimize indexes, and optimize access methods based on query Conditions,Limit the data size of the result set. Note:Fill factor should be appropriate(It is best to use the default value 0 ). The index should be as small as possible,Index Using a column with a small numbe

DemandUse SQL Server Profiler to track all common activities of the current instance and save the results to a file.================================================================In the Start program, select SQL Server Profiler.650) this.width=650; "title=" "style=" border-top:0px;border-right:0px;background-image:non

the current table to the backup table involves the not in and in operations:First, add 0.1 million pieces of test dataCopy codeThe Code is as follows:Create procedure AddDataAsDeclare @ id intSet @ id = 0While (@ id BeginInsert into dbo. Info (id, PName, remark, impdate, upstate)Values (@ id, convert (varchar, @ id) + '0', 'abc', getdate (), 0)Set @ id = @ id + 1EndExec AddData Use not in and in operations:Copy codeThe Code is as follows:SET STATISTICS TIME ONGO-- Backup dataInsert into bakInfo

, sqlbulkcopyoptions.useinternaltransaction) { Bulkcopytimeout = +, notifyafter = dt. Rows.Count, batchsize = batchsize, destinationtablename = destable }) { foreach (DataColumn column in dt. Columns) SBC. Columnmappings.add (column. ColumnName, column. ColumnName); Sbc. WriteToServer (DT); } Return dt. Rows.Count; }What's the problem?The above architecture, 40 million of the da

, SqlBulkCopyOptions.UseInternalTransaction) { BulkCopyTimeout = 300, NotifyAfter = dt.Rows.Count, BatchSize = batchSize, DestinationTableName = desTable }) { foreach (DataColumn column in dt.Columns) sbc.ColumnMappings.Add(column.ColumnName, column.ColumnName); sbc.WriteToServer(dt); } return dt.Rows.Count; }What's the problem?The above architecture, 40 million of

, DataTable dt, int BatchSize = + ) { using (var SBC = New SqlBulkCopy (connectionString, sqlbulkcopyoptions.useinternaltransaction) {bulkcopytimeout = + , notifyafter = dt. Rows.Count, batchsize = batchsize, destinationtablename = destable}) { foreach (DataColumn column in dt. Columns) SBC. Columnmappings.add (column. ColumnName, column. ColumnName); Sbc. WriteToServer (DT); } return dt. Rows.Count; }What's the problem?The above architecture, 40 million of the data per day is OK. However, in th

) {bulkcopytimeout = + , notifyafter = dt. Rows.Count, batchsize = batchsize, destinationtablename = destable}) { foreach (DataColumn column in dt. Columns) SBC. Columnmappings.add (column. ColumnName, column. ColumnName); Sbc. WriteToServer (DT); } return dt. Rows.Count; }What's the problem?The above architecture, 40 million of the data per day is OK. However, in the context of the adjustment to the configuration, the central monitoring program on the memory overflow, the

the average busy time as part of the sample time.4,% User time represents CPU-intensive database operations, such as sorting, executing aggregate functions, and so on. If the value is high, consider increasing the index, using a simple table join, and horizontally splitting the large table to reduce the value. Physical DISK:CURRETN Disk Queue Length counter this value should not exceed 1.5~2 times the number of disks. To improve performance, you can increase the disk. Sqlserver:cache hit Ratio

Tutorial on using the SQL search 1.1.6.1 edition SQL query and analysis tool in red gate Series Red Gate SeriesArticle: SQL compare 10.2.0.1337 edition, one of the red gate series, database comparison tool, complete cracking + tutorial Red Gate Series ii SQL source

= new SqlBulkCopy(connectionString, SqlBulkCopyOptions.UseInternalTransaction) { BulkCopyTimeout = 300, NotifyAfter = dt.Rows.Count, BatchSize = batchSize, DestinationTableName = desTable }) { foreach (DataColumn column in dt.Columns) sbc.ColumnMappings.Add(column.ColumnName, column.ColumnName); sbc.WriteToServer(dt); } return dt.Rows.Count; } What's the prob

problem of disk IO has been the biggest bottleneck of all file read and write.Therefore, the log file is an integral part of the database. When the database in the startup process, the record in the log to do a consistency check of the data, the beginning of the article is introduced.So, what happens to our SQL Server database if the log file is inaccessible, or

, 6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41 from user/* Return results 11, haha, get the name of the administrator Oh! Excited to take the administrator name and password to the backstage landing successfully! 12. Now is the time to think about how to take Webshell, in the background to find a place to upload pictures, but when uploading PHP files when prompted to say that it is not a picture file, depressed! In the background careful