sql server compare two tables for differences

Tags: trace altered default tracking object modificationSQL SERVER default tracking app 3--Detection ofDDL operations for tablesDDL operations that occur on the SQL Server database, can you tell who did it?Yes. The SQL Server default trace has object modification events.This

1. Database: 32767 databases. The minimum value is 1 MB and the maximum value is 1 TB.2. Tables: each database can have a maximum of 2 billion tables.3. Column: Each table can have a maximum of 1024 columns, and each column has a maximum of 8060 bytes (except for text and image columns ). Each database of SQL Server

For new users who are new to SQL databases, there are many questions about SQL versions, but they are too lazy to study them carefully. Although the problem is simple, the impact is not small. Version differences SQL Server 2000 has four editions: Enterprise Edition/Standar

does not work because the failover instance is the same as the corrupted file. With mirroring and log shipping, you can copy files in real time, so you don't have to worry about file corruption. In SQL Server, file corruption rarely occurs, so I think the cluster should be a good choice. Disadvantage of. One of the important issues is that the implementation of recovery is very expensive. Microsoft support

clustered index makes the data in the table orderly based on the key-value contact. Deciding which key value to use as a clustered key is an important factor, and when traversing to the leaf level, you can get the data itself rather than simply getting a pointer to the data (nonclustered index data is not overwritten). The clustered index has a row in the Sys.partitions area, where the index uses index_id = 1per partition, and by default, the clustered index is a single partition. If the cluste

SQL Server tables: SELECT COUNT (1) from sysobjects where xtype= ' U ' views: select COUNT (1) from sysobjects where xtype= ' V ' number stored procedures Selec T count (1) from sysobjects where xtype= ' P 'SELECT * from sysobjects WHERE (xtype = ' U ')C = CHECK ConstraintD = defaults or DEFAULT constraintsF = FOREIGN KEY constraintL = LogFN = Scalar functionIF =

Tags: SQL Server tables, views, indexesFirst, the table related1. CreateUse[test] Go setansi_nullson go setquoted_identifieron go CREATETABLE[dbo] . [Ceshi] ([Id][int]notnull, [Name][varchar (]null), CONSTRAINT[PK_Ceshi] primarykeyclustered ([Id]asc) with (Pad_index=off,statistics_ norecompute=off,ignore_dup_key=off,allow_row_locks=on, Allow_page_locks=on) on[pri

choice. With seek access, SQL Server uses the index to direct to the data row that satisfies the predicate condition. In this example, we refer to this predicate as "seek predicate". In most cases, SQL Server does not have to re-evaluate "seek predicate" as "residual predicate". The index guarantees that "seek" return

invisible. The SQL statement can only be divided into several small SQL statements to gradually locate the bottleneck, for exampleSelect left (BT, 4) as bbt, * from table where FSRQ> getdate ()-1 and gkbz = 1 and scbz = 0Select distinct left (BT, 4) as bbt, t_table_id from table where FSRQ> getdate ()-1 and gkbz = 1 and scbz = 0The execution of these two statements is very fast and the result set is relati

After creating a table on SQL Server, you often need to change the design of the table. If you have any questions, the system will prompt "you are not allowed to save the changes. You must delete the changes and recreate the following tables. The reason is that, to prevent data tables from being changed at will, the st

1. Export Excel tables from the databaseDefine a GridView1protected void Button1_Click (object sender, EventArgs e)//pour out data{if (GridView1.Rows.Count = = 0){Return}Else{gridview1.allowpaging = false;//data paging is canceled before all data can be exportedBind ();Export ("Application/ms-excel", "Filename.xls", GridView1);gridview1.allowpaging = true;//data is bound before rebindBind ();}public void Export (string fileType, String fileName, GridV

--Create a test library first test_tmp --Create two tables based on an existing table SELECT TOP to test_tab1 from Mistest_09428.dbo.squarer; SELECT TOP to test_tab2 from Mistest_09428.dbo.squarer; --Create a role EXEC sp_addrole ' Test_role1 '; 11. 12.--Assign the permissions of select to the role test_role1GRANT SELECT on TEST_TAB1 to Test_role1;GRANT SELECT on test_tab2 to Test_role1;

page is allocated from the consistent extension.The space page is dedicated to the allocation and management of data spaces, including: PFS pages (page free space): Record whether a page is assigned, in a mixed or consistent extension, and how much space is available on the page; Gam page (Global allocation MAP) and Sgam page (secodary Global allocation map): Used to record the location of an idle extension or a mixed extension containing free pages. Sqls Comprehensive utilization of these thre

From: http://www.cnblogs.com/chillsrc/archive/2008/04/15/1154186.html I. Environment and test requirements 1. Test Environment ① Hardware: CPU: 2 GB, memory: 2 GB ② Database: SQL 2005 The result varies depending on the machine configuration. 2. Performance Test Description ① Query after the database server is restarted, that is, the result of the first query.②

In special cases, the sysaltfiles primary database contains the rows corresponding to the files in the database. The table is stored in the master database.Each character set in the syscharsets primary database occupies one row in the table. The table also contains the definition for Microsoft? SQL Server? The sort order used. One of the sorting orders is marked as the default sorting order in sysconfigures

Today, when cleaning up business-Library data, developers say they can use TRUNCATE table to clean up all data from two tables Both tables have their own ID, all made table partitions, single table 200GB, two tables using SELECT ident_current (') The current self appreciation is 3000012, the two tables are almost ide

--- Obtain the occupied capacity of tables in the SQL Server database Create procedure get_tableinfo If not exists (select * from dbo. sysobjects where id = object_id (n' [dbo]. [tablespaceinfo] ') and OBJECTPROPERTY (id, n' isusertable') = 1) Create table tablespaceinfo -- create a result storage table (Nameinfo varchar (50 ), Rowsinfo int, reserved varchar (20

In the past, SQL Server only performed operations on the graphic interface. Now I find that my SQL language skills are getting worse and worse. For example, how to add associations for two tables, cascade update and delete. I checked it at night and found that two methods can be used. Trigger method:Create trigger trg

如果由于外键约束删除table失败，则先删除所有约束：--/第1步**********删除所有表的外键约束*************************/DECLAREc1cursorforselect‘alter table [‘+ object_name(parent_obj) +‘] drop constraint [‘+name+‘]; ‘fromsysobjectswherextype =‘F‘openc1declare@c1varchar(8000)fetchnextfromc1into@c1while(@@fetch_status=0)beginexec(@c1)fetchnextfromc1into@c1endclosec1deallocate c1--/第2步**********删除所有表*************************/use 数据库名(是要删除表的所在的那个数据库的名称)GOdeclare@sqlvarchar(8000)while (selectcount(*)fromsysobjectswhere type=‘U‘)>0beginSELE

Gam, SGAM, Pam, Iam, DCM, and BCM are some special allocation ing tables used in SQL Server to manage space allocation. Understanding their differences and roles plays an important role in understanding the architecture of the SQL Server