Regular useful scripts for a SQL Server DBA

Regular usage scripts SQL Server DBA
=====================
1. On which drive the  database files(mdf & ldf) are located?

use master
select *from sysaltfiles where filename like 'd%'

                      (OR)
select *from master..sysaltfiles where filename like 'd%'

2.How to shrinklog file if it is full?

backup log dbname with no_log
dbcc shrinkfile(2)

3. how to see open transations in a database?

  dbcc opentran


4. HOW TO see if perticlular process is blocked?
Use master
select * from sysprocessess where blocked>0 and spid=57

5. why buffer cache hit ratio <90?

 if the bottlenecks are there
 then the number of pages read in to the cache will vary
 and the ratio of finding the data by the server in the cache will decrease

6 how to find attribute of perticula file?

  Execute spFileDetails 'c:\autoexec.bat'

7. how to see the status of database?

  dbcc showfilestats

8.How to see the  Cpu usage?(if buffer cache hit raio<90)

 select *from sys.sysprocesses order by cpu asc

9.How to find out the info of a specific table on a database?

 select * from sysobjects where name like '%table_name%'

10. What is Undo File? Why it is required?

 Undo file is needed in standby state because while restoring the log backup, uncommited transactions will be recoreded to the undo file and only commited transactions will be written to disk there by making users to read the database. When you restore next tlog backup SQL server will fetch the uncommited transactions from undo file and check with the new tlog backup whether the same is commited or not. If its commited the transactions will be written to disk else it will be stored in undo file until it gets commited or rolledback.

11.How to get the data the from linked server?

 Select * from LinkedServer.DBName.SchemaName.TableName

12.How to find the service pack version?

SELECT SERVERPROPERTY('PRODUCTLEVEL')

13.How to see the collation setting for server level?

SP_HELPSORT

14.How to see log usage info in a database?

select * from  sys.databases where name like '%log_reuse_wait_desc%'

15.How to see the connection info by using DMV'S?

select * from  sys.dm_exec_sessions

16.How to see the transaction isolation level?

DBCC USEROPTIONS

17.SQL Server 2000 database compatible level to SQL Server 2005

EXEC sp_dbcmptlevel AdventureWorks, 90;

18.How to see the memory ocupation of eache query running under Query Analyzer

select * from sys.dm_exec_query_memory_grants

19.How to clear the data from buffer cashe

DBCC DROPCLEANBUFFERS

20.How to see how much space tempdb is allocated for perticulas task

Select * from sys.dm_db_session_space_usage
                 
                  OR
sys.dm_db_task_space_usage

21.The following DMV query can be used to get useful information about the index usage for all objects in all databases

Select * from from sys.dm_db_index_usage_stats
order by object_id, index_id

22.The following query to list all the schedulers and look at the number of runnable tasks.

 Select * from from
    sys.dm_os_schedulers
    where
    scheduler_id < 255

23.Which Query is taking more cpu time

select * from sys.dm_exec_query_stats

24.How to find whether any active requests are running in parallel for a given session by using the following query.

select * from
    sys.dm_exec_requests



26. How to see the lock info?

 select * from sys.dm_tran_locks

27. How to open cluadmin from windows 2008 server?

   cluadmin.msc