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What is the use of DBCC commands?

Posted By :nishithraj     Posted Date :November 30, 2009    Points :10   Category :Sql Server 
DBCC stands for database consistency checker. We use these commands to check the consistency of the databases, i.e., maintenance, validation task and status checks

You can also find related Interview Question to What is the use of DBCC commands?  below: 

Can you give me some DBCC commands?

  
DBCC CHECKDB - To ensure tables in the db and the indexes are correctly linked.

DBCC CHECKALLOC - To check that all pages in a db are correctly allocated.

DBCC CHECKFILEGROUP - Checks all tables file group for any damage. (More...)

What is the use of DBCC commands?

  
DBCC stands for database consistency checker. We use these commands to check the consistency of the databases, i.e., maintenance, validation task and status checks (More...)

What is the use of DBCC commands?

  
DBCC stands for database consistency checker. We use these commands to check the consistency of the databases, i.e., maintenance, validation task and status checks. (More...)

What is the use of DBCC commands in SQL Server?

  
DBCC stands for database consistency checker. We use these commands to check the consistency of the databases, i.e., maintenance, validation task and status checks.
E.g. DBCC CHECKDB - Ensures that tables in the db and the indexes are correctly linked.
DBCC CHECKALLOC - To check that all pages in a db are correctly allocated.
DBCC CHECKFILEGROUP - Checks all tables file group for any damage.
(More...)

What is DBCC commands?

  
It is use to perform following tasks
-Maintainece task like indexing, file group
- Task that display more information after gathering them.
- Misc Task such as removing dll from memory (More...)

What is the difference between TRUNCATE and DELETE commands?

  
TRUNCATE is a DDL command whereas DELETE is a DML command. Hence DELETE operation can be rolled back, but TRUNCATE operation cannot be rolled back. WHERE clause can be used with DELETE and not with TRUNCATE. (More...)

Difference between DELETE and TRUNCATE commands ?

  
TRUNCATE TABLE is faster that DELETE TABLE and uses fewer system and transaction log resources.
Truncate will actually remove all the rows from a table and there will be no data in the table after we run the truncate command.
Delete command removes the rows from a table based on the condition that we provide with a WHERE clause. (More...)

Can you give me some DBCC command options?(

  
DBCC CHECKDB - Ensures that tables in the db and the indexes are correctly linked. and DBCC CHECKALLOC - To check that all pages in a db are correctly allocated. DBCC SQLPERF - It gives report on current usage of transaction log in percentage. DBCC CHECKFILEGROUP - Checks all tables file group for any damage. (More...)

What is the difference between TRUNCATE and DELETE commands?

  
1.TRUNCATE is a DDL command whereas DELETE is a DML command.
2.DELETE operation can be rolled back, but TRUNCATE operation cannot be rolled back.
3.WHERE can be used with DELETE and not with TRUNCATE. (More...)

List out some DBCC command options

  
DBCC CHECKDB - Ensures that tables in the db and the indexes are correctly linked.and DBCC CHECKALLOC - To check that all pages in a db are correctly allocated. DBCC SQLPERF - It gives report on current usage of transaction log in percentage. DBCC CHECKFILEGROUP - Checks all tables file group for any damage. (More...)

What is difference between DELETE & TRUNCATE commands?

  
Delete command removes the rows from a table based on the condition that we provide with a WHERE clause. Truncate will actually remove all the rows from a table and there will be no data in the table after we run the truncate command.

TRUNCATE

.TRUNCATE removes all rows from a table, but the table structure, its columns, constraints, indexes and so on, remains. The counter used by an identity for new rows is reset to the seed for the column.
.You cannot use TRUNCATE TABLE on a table referenced by a FOREIGN KEY constraint. Because TRUNCATE TABLE is not logged, it cannot activate a trigger.
.TRUNCATE cannot be rolled back.
.TRUNCATE is DDL Command.
.TRUNCATE Resets identity of the table

DELETE
.DELETE removes rows one at a time and records an entry in the transaction log for each deleted row.

.DELETE Can be used with or without a WHERE clause
.DELETE Activates Triggers.
.DELETE can be rolled back.
.DELETE is DML Command.
.DELETE does not reset identity of the table. (More...)

Dbcc errorlog and xp_readerrorlog?

  
Dbcc Errorlog : It helps to close the current error log and start the another one

xp_readerrorlog : It helps to show the default log for sqlserver (More...)

What is sp_configure commands and set commands?

  
Use sp_configure to display or change server-level settings. To change database-level settings, use ALTER DATABASE. To change settings that affect only the current user session, use the SET statement. (More...)

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