how to update millions of records in sql server

Aliases cannot be used for tables in update statements in SQL ServerEg:update Table A set a.column= "" where ...This is not true in SQL Server (it can be in Oracle), and you can't use aliases for tables. This is because the UPDATE statement we've been writing is abbreviated

Label:I have long been engaged in ASP. NET development, often update the database design of different environment (dev,uat,staging,production). After a long time, it is very painful and tedious to update the database fields when the server is maintained, which often misses the update of a field in a table and causes th

Label:Pros: Allows data to be read (without blocking other transactions) and update data at a later time, ensuring that data has not been changed since the last time the data was readWhen you use Updlock to read a record, you can add an update lock to the record that is fetched, and the record of the lock cannot be changed in other threads until the transaction at the end of the thread ends.BEGIN TranSELECT

There are two lock classification methods.(1) from the perspective of the Database SystemThere are three types of locks:• Exclusive Lock)A resource with an exclusive lock can only be used by locked programs. Other operations on the resource are not accepted. SQL Server automatically uses an exclusive lock when executing the data UPDATE command, namely the INSERT,

Read from the client when time now inserts a Tatetime type field from the SQL Server table, the time format in the client's area design is T,TT, that is, the morning-afternoon notation, which fails to convert to datetime in SQL Server and SQL statements. In the development o

Tags: SP data bs SQL Information Server nbsp First 500Pre-Preparation:Normal table, temporary table: It has statistical information on the two sessions.Table variable: There is no statistical information.--------------------------------------------------------------------------------------------------------------- -----------------------------------Create a scenario for statistics:1. When you create an inde

Chinese Simplified Chinese Traditional Danish Ukrainian Uzbek language Urdu language Armenian Igbo language Russian Bulgarian Sinhala language Croatian Icelandic Galician Catalan Hungarian Zulu, South Africa Kannada language Hindi Indonesian Sunda Indonesian Javanese Indonesian language Gujarati Kazakh Turkish Tajik language Serbian language Sesotho language Welsh Bengali Cebu language Nepalese language Basque language Boolean language (Afrikaans) Hebrew Greek German Italian Yiddish Latin langu

Label:Transfer from http://www.shangxueba.com/jingyan/1940447.html 1. Cursor mode Copy the Code code as follows: DECLARE @Data NVARCHAR (max) SET @Data = ' 1,tanw,2,keenboy '--id,name DECLARE @dataItem NVARCHAR (100) DECLARE data_cursor Cursor for (SELECT * from Split (@Data, '; ')) OPEN Data_cursor FETCH NEXT from Data_cursor to @dataItem While @ @FETCH_STATUS =0 BEGIN DECLARE @Id INT DECLARE @Name NVARCHAR (50) DECLARE dataitem_cursor Cursor for (SELECT * from Split (@dataItem, ', ')) OPEN Dat

needs to be displayed in the result setStatisticsInformation, The optimizer will select the best execution method, because the optimizer willStatisticsInformation. InCreateWhen indexing, SQLServer will be on the index ColumnCreateStatisticsInformation. To put it simply,StatisticsInformationThat is, the data that can describe the data distribution in the index or column. Query selectivity: Formula: Total number of non-duplicated data in a column/total number of data in a column The higher the s

Environment: SQL Server 2008 R2 Problem: The update or insert of the view or function ' XXX ' failed because it contains a derived domain or a constant field to resolve To create a view command: Create View D_s_g (Sno,avg_grade) as select Sno,avg (grade) from SC Group by Sno; Reason: Views view does not allow modification. Workaround: Recreate a table

Label:In levels tenth through 12, we looked at the internal structure of the index and the effect of changing the structure. In this article, continue to review the effects of insert,update,delete and merge. First, let's take a look at these four commands alone. inserting insert When inserting a row of data into a table, no matter whether the table is a heap table or a clustered index table, a portal will definitely be inserted in the table's index, w

From: http://www.oecp.cn/hi/zhaolihong/blog/1980 When SQL Server was recently used in projects, it was found that frequent updates and frequent queries cause deadlocks in high concurrency. We usually know that if two transactions insert or modify data to a table at the same time, it will occur when the X lock of the table is requested, and it is already held by the other party. Because the lock is not obta

SQL ServerUpdate Tb_user Set "don't add tb_user alias usr from Tb_user usr before pass here." Innerjoinon= addr.naddressid where usr.id =123 MysqlUPDATEMem_world asMw1INNER JOINMem_world asMW2 onMw1.parentid=Mw2.widSEToWS. Level =MW2. Level WHEREMw2.baseid= 107 andMw2.parentid= 0 andMw2.size> 1;One is set and then associated, and the other is the first association and then set.Differences between

The basic algorithm for automatically updating statistics is: · If the table is in the tempdb database table the cardinality is less than 6, automatically updated to the table for each of the six modifications. · If the base of the table is greater than 6, but less than or equal to 500, update the status every 500 of the modifications. · If the cardinality is greater than 500, the table changes when the statistics are updated (tables of 500 + 20%). ·

Tags: http art targe display line number Sele article blank detail queryNote : Reference from http://blog.csdn.net/lenovouser/article/details/52281726 Query Displays line number: 1 SELECT 2 Over (ORDER by as rowNumber 3from 4 table_name; Update one column line number: 1 UPDATEtable_name2 SETNew_row=T1.rowid3 from 4 ( 5 　　　　 SelectTABLE_PK,6Row_number () Over(ORDER byORDERBY_ID) asrowID7 from 8 table_name9 )Ten) asT1 One

) (SELECT rfi_id from rp_forminstance WHERE rfl_id = ' RFL20090410001 ' and rfi_date = RPF. Rfi_date and rfi_state = ' 1 ') Then ' D203 ' ELSE ' D103 ' END ' and RPF. Rfi_date between @date -30 and @date and RPF. Rfi_state= ' 1 ') as a inner join YSJ_Backup.dbo.RP_BusTransInfo B on A.rpb_name=b.rbi_department and A.pushdate=b.rbi_push Date where A.loadcount!=b.rbi_loadcount or A.transcount!=b.rbi_transcount or A.hisload!=b.rbi_hisload or a.HisTrans!=b . Rbi_histrans or A.rbi_status!=b.rbi_status

Copy Code code as follows: Batch update data (5000 per lot) public static void Update (String connstring, DataTable table) { SqlConnection conn = new SqlConnection (connstring); SqlCommand COMM = conn. CreateCommand (); Comm.commandtimeout = _commandtimeout; Comm.commandtype = CommandType.Text; SqlDataAdapter adapter = new SqlDataAdapter (comm); SqlCommandBuilder Commandbulider = new S

Example of a trigger codes: Code of the insert, delete, and update trigger: Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->-- DBO. trgroups. SQL If exists ( Select * From sysobjects where Name = 'trgroups' and type = 'tr ') Begin Drop trigger trgroups If not exists ( Select * From sysobjects where Name = 'trgroups' and type = 'tr ') Print 'drop trgroups s

SQL server update from statement, sqlupdate To update a table, use the where statement: Copy codeThe Code is as follows:UPDATE Ttest SETStatusInd = 'active'WHEREId = 123 Note: The table name after the update statement. aliases cannot be enabled.At this time, the id field is

error|server| Error | server | resolution A 14274 error occurs when you attempt to update or delete a job created before SQL Server2000 after a change to the Windows host name. This error does not occur in SQL 7.0, but in a cluster environment, this error may also occur afte