Join the Stack Overflow community to: Ask programming questions Answer and help your peers Get recognized for your expertise. AKADIA Information Technology AG, Bern, Schweiz. These are examples of the logical file names and physical file names of a database created on a. Read entire file You are encouraged to solve this task according to the task description, using any language you may know.
SQL Server 2. 00. Survival Guide. Content.
Truncating the. Transaction Log. Log truncation occurs at. The size of a transaction log is therefore controlled in one of. Shrinking the Transaction Log. Example Truncating/ Shrinking.
This TiddlyWiki contains the following tiddlers: $:/config/DefaultSidebarTab $:/config/Navigation/openLinkFromOutsideRiver $:/config/NewJournal/Title. The syntax of a catch clause resembles functions that take a single argument. The identifier (id1, id2, and so on) can be used inside the handler, just. Win32- DOS und OS/2-Fehler =========================== Erzeuger.: Megos AG, Fröhlichstr. 33, 5200 Brugg, Switzerland, www.megos.ch Stichworte. Archiving Oracle Data in easily restorable non-Oracle structures Oracle Tips by John Adolph Palinski. C-Programm, C-Module/Dateien, C-Quellkode, Compiler. Ein C-Programm besteht aus einer oder mehreren Datei(en) mit der Endung.c, aus der/denen.
You can display packets as soon as they are received or saved to a file. When snoop writes to an intermediate file, packet loss under busy trace conditions.
Transaction Log. Database is in FULL Recovery. Mode. Database is in SIMPLE Recovery. Mode. System and User Databases (=. Oracle Schema)SQL Server Services. Referring Objects.
Metadata (Data Dictionary)SQL Server Logon and Database. Access. SQL Server Query Designer. SQL Server Batch Utility.
Local Variables. Distributed Queries. Formatting Dates. CASE function (similar to. Oracle DECODE)Dynamically constructing SQL. Statements. Transactions.
TOP n Queries. Show User Tables for. Database. Show Primary- and. Foreign Key of a Table.
Database Properties. Change a property. Create a Database. Information on Databases.
Data Structures. Database Recovery Model. Check Extents, Pages. Traceflags. Backup a Database.
Restore a Database. User defined Data. Types. BLOBSComputed Columns. Generate Column Value.
Identity Property. Generate Column Value. NEWID Function. Create Table in specified.
File Group. Generating Transact- SQL Scripts. Logged and Nonlogged Bulk. Copies. DEFAULT Constraint. CHECK Constraint.
PRIMARY KEY Constraint. FOREIGN KEY Constraint. DEFAULT Object. RULE Object. Disabling and Enabling. Constraints. Pages and Extents. Heaps and the Index.
Allocation Map (IAM)Nonclustered. Indexes. Clustered.
Indexes. Sysindexes Table. Verify the sysindexes Table. Full Table Scan. Non Clustered Index Read.
Clustered Index Read. Clustered Index. with Non Clustered Index Read. Page Splits in an Index. Page Splits do not occur in. Heap. Determining Selectitivity. Determine Table Structures.
Optimizer Statistics. Manually Creating Statistics.
Create Statistics for whole. Database. View. Index Statistics and evaluating Index Selectivity. Creating Views. Encrypt / Decrypt Views.
Updateable Views. Indexed Views. Populate Table with a Stored. Procedure. Check Stored Procedure. Properties. Recompile.
Stored Procedures, Trigger that reference a Table. Using Input Parameters. Returning Values Using. Output Parameters. Process OUTPUT Value and. RETURN Parameter.
Using last. insert @@identity for Foreign Key Value. Custom. Messages from Stored Procedures added to Eventlog. EMail Interface. Extended Stored Procedures. Scalar User Defined. Function. Multi- Statement Table- valued. Function. INSERT Triggers. DELETE Triggers. UPDATE Triggers.
Transact SQL. Examples. Shrinking the. Logfile. Handling NULLs. COUNT(*)NULL Values in Foreign Keys. Microsoft® SQL Server data is stored in databases.
The data in. a database is organized into the logical components visible to users. A database is also. When using a database, you work primarily with the logical.
The physical implementation of. Typically, only the database administrator needs to work. Each instance of SQL Server has four system databases. Some organizations have only one user database, containing all the data for. Some organizations have different databases for each group in their. For example, an. organization could have one database for sales, one for payroll, one for a document.
Sometimes an application uses only one database; other. It is not necessary to run multiple copies of the SQL Server. An instance. of the SQL Server is capable of handling thousands of users working in multiple databases. Each instance of SQL Server makes all databases in the instance. When connecting to an instance of SQL Server, your connection is. This database is called the. You are usually connected to a database defined as your default.
SQL Server allows you to detach databases from an instance. SQL Server, then reattach them to another instance, or even attach the database. If you have a SQL Server database file, you can tell SQL. Server when you connect to attach that database file with a specific database.
Microsoft® SQL Server maps a database over a set of. Data and log information are never mixed on the same file, and. SQL Server databases have three types of files: The primary data file is the starting point of the database. Every database has one primary. The recommended file name extension for primarydata files is . Secondary data files comprise all of the data files other.
Some databases may not have any secondary data files. The recommended file name. Log files hold all of the log information used to recover.
There must be at least one log file for each database, although. The recommended file name extension for log files. SQL Server does not enforce the . In SQL Server, the locations of all the files in a database are. Most. of the time the database engine uses the file location information from the master. For some operations, however, the database engine uses the file location. SQL Server files have two names: logical_file_name is a name used to refer to.
Transact- SQL statements. The logical file name must conform to the rules for SQL. Server identifiers and must be unique to the database. It must follow the rules for Microsoft Windows NT® or.
Microsoft Windows® Me, and Microsoft Windows 9. These are examples of the logical file names and physical file. SQL Server: SQL Server data and log files can be placed on either FAT or NTFS. Use the following SQL Statement to list the logical and physical. USE My. Db. SELECT SUBSTRING(name,1,2. Name,SUBSTRING(filename,1,5.
Filename. FROM dbo. Name. Filename- -- -- -- -- -- -- -- -- -- - - -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -My. Db_System. E: \Ms. SQLServer\Data\My. Db_System. MDFMy.
Db_Log_1. E: \Ms. SQLServer\Data\My. Db_Log_1. LDFMy. Db_Data_1. E: \Ms. SQLServer\Data\My.
Db_Data_1. NDFMy. Db_Index_1. E: \Ms.
SQLServer\Data\My. Db_Index_1. NDFIf you have a Backup and you would know, the logical and physical. Backup, then you can use RESTORE. FILELISTONLYRESTORE FILELISTONLY FROMDISK = N'E: \Ms. SQLServer\Backup\My.
Db. bak'WITH FILE = 7. Logical. Name Physical. Name. - -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -. My. Db D: \sql. MSSQL. 1\MSSQL\Data\My.
Db. mdf. My. Db_log C: \DATA\My. Db_log. ldf. SQL Server offers three recovery models for each database. The recovery models determine. Most people either select full or simple for all of their databases. In most cases, selecting the.
Although using the full recovery model makes logical sense, there. We will further define why there are. First, let's take a closer look at each model. Simple. The simple recovery model allows you to recover data only to the. Transaction log backups are not. Full. The full recovery model uses database backups and transaction log. Along with being able to restore.
All operations, including bulk operations such as SELECT INTO. CREATE INDEX and bulk- loading data, are fully logged and recoverable. Bulk- Logged. The bulk- logged recovery model provides protection against failure.
In order to get better performance, the following. SELECT INTO, bulk- load.
CREATE INDEX as well as text and image operations. Under the bulk- logged. In addition, the bulk- logged recovery model. So once again, based on the information above it looks like the. Full Recovery model is the way to go. Given the flexibility of the full recovery model.
The following factors will help you determine. Select Simple if: Your data is not critical. Losing all transactions since the last full or differential. Data is derived from other data sources and is easily. Data is static and does not change often.
Select Bulk- Logged if: Data is critical, but logging large data loads bogs down the. Most bulk operations are done off hours and do not interferewith normal transaction processing. You need to be able to recover to a point in time. Select Full if: Data is critical and no data can be lost. You always need the ability to do a point- in- time.
Bulk- logged activities are intermixed with normal transaction. You are using replication and need the ability to resynchronize. Switching recovery models. For some databases, you may need to use a combination of these.
Let's say you have a critical system and you cannot afford to lose any. In a case. like this, you may want to switch recovery models prior to your maintenance tasks. This. can be automated using T- SQL in the job that runs your maintenance or data load tasks.
After the maintenance task is completed, the recovery model can be switched back. Switching between full and bulk- logged models is probably the best. You can switch. from any recovery model to another recovery model, but prior to or after the switch, you. ALTER DATABASE Northwind SET RECOVERY FULLGOEvery Microsoft® SQL Server™ 2. This record of transactions and their modifications supports three. Recovery of individual transactions. If an application issues a ROLLBACK statement, or if SQL.
Server detects an error such as the loss of communication with a client, the log. Recovery of all incomplete transactions when SQL Server is. If a server running SQL Server fails, the. When a copy of SQL Server is started. Every modification recorded in the log which.
Every incomplete. Rolling a restored database forward to the point of. After the loss of a database, as is possible if a hard. RAID drives, you can restore the. You first restore the last full or differential. As you restore each log backup, SQL Server reapplies all the. When the. last log backup is restored, SQL Server then uses the log information to roll.
If log records were never deleted from the transaction log, the. At some point in time, old log records no longer. The process of deleting these log records to reduce the size of the logical log. The active portion of the transaction log can never be truncated. The active portion of the log is the part of the log needed to recover the. It must always be present in the database in case the server fails because. The record at. the start of the active portion of the log is identified by the minimum recovery log.
Min. LSN). The recovery model chosen for a database determines how much of the. Although. the log records in front of the Min. LSN play no role in recovering active transactions.