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First of all, I need to emphasize that this article aims to reveal the principle of recovering the deletion records of heap tables. What I have considered does not apply to every situation of everyone. I hope you will forgive me ~ Many friends think that in simple mode, the heap table cannot retrieve a record because there is no log record. In fact, it can be recovered in a sense, because when a heap table deletes a record, it only changes the row offset
the last backup log statement in each allocation unit.Differential changed map information about the Zone changed after the last backup database statement in each allocation unit. Structure of the data page: Each page starts with a 96-byte header to store system information about the page. This information includes the page number, page type, available space of the page, and the allocation unit ID of the object that owns the page. On the data page, data row
Example: Get records that are duplicated within 48 hoursSELECT * from(SELECTB.*, LAG (B.operatortime,1, B.operatortime) Over(PARTITION byB.NoORDER byB.operatortime) asBefortime, Lead (B.operatortime,1, B.operatortime) Over(PARTITION byB.NoORDER byB.operatortime) asNexttime fromTest b) aWHERE DATEDIFF(HH, A.befortime, A.operatortime) - and DATEDIFF(HH, A.operatortime, A.nexttime) - andA.noinch(SELECTc.no fromdbo. Test CGROUP byc.no having COUNT(c.no)> 1)Lag function:Func
Server Database SQL statement Import and Export Daquan, including the import and export of data with other databases and files. /****** Export to excelExec master.. xp_mongoshell 'bcp settledb. DBO. shanghu out c: \ temp1.xls-C-Q-s "gnetdata/gnetdata"-U "sa"-P ""' /*********** Import ExcelSelect *From OpenDataSource ('Microsoft. Jet. oledb.4.0 ','Data source = "C: \ test.xls"; user id = admin; Password =; e
suitable for text data files. Note: during import, all rows meeting the conditions will be overwritten.During export, all rows that meet the conditions will also be exported to the specified file. This stored procedure is only implemented using BCP--2003.08 -----------------*/ /* -- Call example-- Data exportExec p_binaryio 'zj', '','', 'Acc _ demo data .. tb', 'img ', 'c: \ zj1.dat' -- Data export
the whole pig, not a pig leg. ), tables that include varchar, nvarchar,varbinary, or sql_variant columns are not constrained by this restriction. When the total size of all fixed and variable columns in a table exceeds the limit of 8k, SQL Server dynamically moves one or more variable-length columns to the page in the Row_overflow_data allocation unit, starting from the largest column. (Readme: Move a colu
can be summed up as: Insert, Update, Delete. The SQL statement differs greatly from the Visual FoxPro command function-target positioning must rely on conditional statements (Where clauses) (Visual FoxPro can easily be positioned to nth rows); buffering provides the basis for these vital positioning conditions, Cannot generate a location statement without buffering! Confirm updates, discard updates Confi
; text and ntext are suitable for text data files. Note: during import, all rows meeting the conditions will be overwritten.During export, all rows that meet the conditions will also be exported to the specified file. This stored procedure is only implemented using BCP--2003.08 -----------------*/ /* -- Call example-- Data exportExec p_binaryio 'zj', '','', 'Acc _ demo data .. tb', 'img ', 'c:/zj1.dat' -- D
Detecting and solving latency and blocking I/O problems in SQL Server 2000 SP 4 released on: 7/13/2005 | updated on: 7/13/2005 Robert DorrMicrosoft Corporation Abstract:Special columnist Robert Dorr explores how reporting tools in SQL Server 2000 Service Pack 4 significantly reduce the time spent identifying and identi
SQL classification: ddl-data Definition language (create,alter,drop,declare) dml-Data Manipulation Language (Select,delete,update,insert) dcl-Data Control Language (Grant,revoke, Commit,rollback) First, a brief introduction to the underlying statement: 1, Description: Create a database2. Description: Delete DatabaseDrop Database dbname3. Description: Backup SQL Server
to the Publishing Server or re-publish the dataTo other subscription servers.ReleasePublishing is a collection of one or more projects in a database. The grouping of multiple projects enables the specified logic-relatedIt is easier to copy group data and database objects together.ProjectA project is a data table, data partition, or database object to be copied. The project can be a complete table or a few columns (use the verticalDirect filtering), s
Excel|server /* Stored Procedure name: Exporting data to Excel Feature Description: Export data to Excel EXEC exporttoexcel @server = '. ', @uname = ' sa ', @pwd = ', @QueryText = ' SELECT * from Dldata. BBBBBB ', @filename = ' D:\ImportToExcel.xls ' */ IF object_id (' exportToExcel ') is not NULL DROP PROC exporttoexcel Go CREATE PROCEDURE exportToExcel ( @server
. The maintenance of the index includes:1. Rebuilding the IndexAs data rows are inserted, deleted, and data pages split, some index pages may contain only a few pages of data, and when applied to large chunks of I/O, rebuilding a nonclustered index can reduce fragmentation and maintain the efficiency of large chunks of I/O. Rebuilding an index is actually a re-organization of B-tree space. The index needs to be rebuilt under the following conditions:(
Label:Original: SQL Server Tuning Series advanced (in-depth profiling statistics)ObjectiveAfter the analysis of the previous few, in fact, in general has been the first glimpse of the importance of SQL Server statistics, so this article will be sacrificed this artifact.This content will be very long, sit good bench, me
First of all, I need to emphasize that this theme is to reveal the heap table delete record to retrieve the principle, I consider the aspect does not apply to each individual situation, hope everyone forgive ~ Many friends think that the database in simple mode, the heap table mistakenly delete a record, can not be retrieved, because there is no logging. In fact, in a sense, it can be recovered, because the heap table changed the row offset only when
entry record. The order of entries in the row Offset Table is the opposite to that of the row on the page. Large Row Support A row cannot span pages, but some of the rows can be moved to the page where the trip is located. Therefore, the row may be very large. The maximum data size and overhead of a single row of a page are 8,060 bytes (8 KB ). However, this does not include data stored in the Text/
Reposted from: longtang Bay 1.1.1 obtain the first N records SQL Server: Select Top N * From xtable ORACLE: Select * From xtable where rownum DB2: Select * From xtable fetch first n rows only 1.1.2 obtain the current date SQL Server: Select getdate () ORACLE: Select sysdate
ObjectiveAfter the analysis of the previous few, in fact, in general has been the first glimpse of the importance of SQL Server statistics, so this article will be sacrificed this artifact.This content will be very long, sit good bench, melon seeds snacks and so on ...No nonsense, go to the chase.Technical preparationThe database version is SQL SERVER2008R2, whic
appears. If you want to use the symbol as a normal symbol, you should turn off this feature. To turn off this feature, you can run the following command: Set define off, which is a sqlplus command, not an SQL command. Sqlplus sets the environment in which SQL runs in Oracle.Double vertical bar (| | ): Oracle uses a double vertical bar to represent string join functions.Asterisk (*): SELECT * means that al
Procedure UID Smallint The schema ID of the object owner.For databases upgraded from the old version of SQL Server, the schema ID is equal to the owner's user ID.Important:If you use any of the following SQL Server DDL statements, you must use the SYS. Objects directory view instead of SYS. sysobj
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