Work adeventure : Permission to view sql error log (ONLY)

I had a situation where I had to give a user permission to view the sqlerror log only. I achieved by doing the following

• Create a login  DBA_error_logUser  in the server
• Added the login to the securityadmin server role ( to view sql error log the login must be the member of this server role)
• Created a user DBA_error_logUser  with map to the login to grant access to the error logs
• Deny Alter to any Login 
• Grant permission to view Sql Server Logs for the user
• Create a log on Trigger to deny access to Query Window

---Create a login  DBA_error_logUser  in the server

use [master]
GO

CREATE LOGIN [DBA_ErrorLogUser] WITH PASSWORD=N'123', DEFAULT_DATABASE=[master], CHECK_EXPIRATION=OFF, CHECK_POLICY=OFF GO


--Added the login to the securityadmin server role
EXEC master..sp_addsrvrolemember @loginame = N'DBA_ErrorLogUser', @rolename = N'securityadmin'
 GO


--Created a user DBA_error_logUser  with map to the login to grant access to the error logs

CREATE USER [DBA_ErrorLogUser] FOR LOGIN [DBA_ErrorLogUser] GO

--Deny Alter to any Login

DENY ALTER ANY LOGIN TO DBA_ErrorLogUser GO


--Grant permission to view Sql Server Logs for the user

Grant EXECUTE ON master.sys.xp_readerrorlog TO DBA_ErrorLogUser GO

--Create a log on Trigger to deny access to Query Window

  IF EXISTS ( SELECT * FROM master.sys.server_triggers
                WHERE parent_class_desc = 'SERVER' AND name = N'Deny_QueryWindowLogin_Trigger' )

DROP TRIGGER [Deny_QueryWindowLogin_Trigger] ON ALL SERVER
 GO

Create TRIGGER Deny_QueryWindowLogin_Trigger ON ALL SERVER
WITH EXECUTE AS 'sa'
FOR LOGON AS
BEGIN
   DECLARE @data XML
   SET @data = EVENTDATA()
  DECLARE @AppName SYSNAME, @LoginName SYSNAME

  SELECT @AppName = [program_name] FROM sys.dm_exec_sessions WHERE session_id = @data.value('(/EVENT_INSTANCE/SPID)[1]', 'int')

SELECT @LoginName = @data.value('(/EVENT_INSTANCE/LoginName)[1]', 'sysname') IF @AppName= 'Microsoft SQL Server Management Studio - Query' AND @LoginName = 'DBA_ErrorLogUser'

BEGIN
             ROLLBACK ; --Disconnect the session
END
 END ;

Work adventure: I/O error 21(The device is not ready )

We had an error all of a sudden on our sql server

"Microsoft OLE DB Provider for SQL Server:
I/O error 21(The device is not ready.) detected during read at offset 0x0000a7a239c000 in file 'DataFileName'.
- HY000 - HRESULT=0x80004005 “

Since the error message mentions that the drive on which one of the data file resided was not ready, it was obvious that the underlying storage was the problem.
But the System Event Log did not have any error messages related to storage. The database was online and accessible. But when I  tried accessing the Properties of this database, the same error was thrown.


The reason for this error was not something that happened at that time. Another email chain from the Windows Administrators sent a few hours ago said it all. They had found that the drive letter associated with the Mount Point hosting this data file was missing and they had *mapped* it somehow. Not sure how they had done the drive mapping. Most likely the drive hosting this data file got disconnected while the database was online.


I fixed this by bringing the database offline and back online after few seconds

ALTER DATABASE <dbname> SET OFFLINE WITH ROLLBACK IMMEDIATE
ALTER DATABASE <dbname> SET ONLINE

Create and restore database using backup files from the network

I had a project where I had to create and restore the database from the backup files in a network.
I achieved it by following these steps.

• I moved all the backup files from the network to the local server in a backup  folder.
• Created a table BackupFileList to store the current database name and the backup file names using the command shell script
• Executed a dynamic SQL script to create all the databases.
• Executed the dynamic script to restore all the databases I made use of the created table to build a dynamic query to find the database name and the backup file.

( Note I had to use the MOVE command in the restore script since the physical path of the data file and the log file were different in the local server than the other server from where the backup was done.)


First of all need to make sure that the 'xp_cmdshell' is enabled.


EXEC sp_configure 'show advanced options', 1;
GO
RECONFIGURE;
GO

EXEC sp_configure 'xp_cmdshell',1
GO
RECONFIGURE
GO

I ran  the following query to see the  physical path of the back up sets that was moved over from the network.

restore filelistonly from disk V:\SQL\Backup\Daily\DB1_backup_2015_06_22_194001_8960340.bak'
with file = 1
go

[In SQL Server 2008 and later, you need to have CREATE DATABASE permission to get this information

 

 
If there are multiple backup sets on the backup device, specify the backup set number using the “WITH FILE = n” option.

 To specify the second backup set on the device run this code:

restore filelistonly from disk V:\SQL\Backup\Daily\DB1_backup_2015_06_22_194001_8960340.bak'
with file = 2
go ]


Script 1 :
Important!!!!
BEFORE RUNNING MAKE SURE THAT THE SERVICE ACCOUNT HAS PERMISSION IN THE PATH DIR.

--To create a backupfiles list and populate a table in the work db

--delete from HCFS_WORKDB..DBBackUpFilesList

CREATE TABLE #DirectoryList (
  line  VARCHAR(512))
DECLARE @f  table (Fname varchar(100))
DECLARE @Path varchar(256) = 'dir V:\SQL\Backup\Daily\'
DECLARE @Command varchar(1024) =  @Path+  '/b /a-d  /s *.bak ' --' /s /b /o:gn' --/a:d /s /b | sort'
PRINT @Command
INSERT #DirectoryList
EXEC MASTER.dbo.xp_cmdshell @Command
DELETE #DirectoryList WHERE  Line IS NULL

delete from #DirectoryList where ( line not like ('%2015_06_24%')) --keep the recent backup file

delete from #DirectoryList where line like '%system%'
delete from #DirectoryList where line like '%\Diffferntial%'
delete from #DirectoryList where line not like '%\client_%'
--select line from #DirectoryList
insert into  @f
select SUBSTRING(line,charindex('\client_',line,1)+1,512 ) from #DirectoryList
--capture the database name and the filename in the table
insert into DB_WORKDB..DBBackUpFilesList (DBname,BackupfileName)
select rtrim(left(SUBSTRING(fname ,charindex('\client_',fname,1)+1,100 ),charindex('_backup',SUBSTRING(fname ,charindex('\client_',fname,1)+2,100 ),1))),SUBSTRING(fname ,charindex('\client_',fname,1)+1,100 ) from @f
--select substring(SUBSTRING(line,charindex('\client_',line,1)+1,512 ),charindex('\',line,1)+1,512)  from #DirectoryList
DROP TABLE #DirectoryList
GO

 


-------------------------------------------------------------------------------

Script 2 : Create multiple databases using a cursor


declare @curClientCode as cursor ,@db varchar(100),
@sqlCreateDb nvarchar(max),
@dbName varchar(100)
SET @curClientCode = CURSOR FOR
--crete db for arm clients too
select name from sys.databases
 where name like 'client_%'

OPEN   @curClientCode
FETCH NEXT
FROM @curClientCode into @db
WHILE @@FETCH_STATUS = 0
BEGIN
SET @dbName = cast(@db as varchar)
SET @sqlCreateDb = 'USE  master' + CHAR(13) +
--'DROP DATABASE  ' +  @dbName + CHAR(13) +
' CREATE DATABASE ' + @dbName +  CHAR(13) +
' ON (NAME = ' + @dbName + '_data, FILENAME = ''E:\SQL\Data\' + @dbName +'.mdf'', Size = 100MB,MAXSIZE=unlimited, FILEGROWTH = 10)' + char(13) +
' LOG ON (NAME = ' + @dbName +  '_log, FILENAME = ''L:\SQL\Data\' + @dbName +'.ldf'', Size = 5MB,MAXSIZE=500MB, FILEGROWTH = 10); '
   

print @sqlCreateDb
exec sp_executesql @sqlCreateDb;
FETCH NEXT
FROM @curClientCode into @db
END
CLOSE @curClientCode
DEALLOCATE @curClientCode


---------------------------------------------------------
Script 3 : Restore the database with MOVE command from the file
The backup files name were found from the table in the DB_workdb that was used earlier to capture the database name and the backup files


 use master
Go
declare @curClientCode as cursor ,@db varchar(10),
@sqlRestoreDb nvarchar(max),
@dbName varchar(20),
@backupFile varchar(100)
SET @curClientCode = CURSOR FOR
select name from sys.databases
 where name like 'client_%'
OPEN   @curClientCode
FETCH NEXT
FROM @curClientCode into @db
WHILE @@FETCH_STATUS = 0
BEGIN
SET @dbName = @db
SELECT  @backupFile = BackupFileName from HCFS_WORKDB..dbBackUpFilesList where dbname = @dbName
SET @sqlRestoreDb = 'ALTER DATABASE ' +  @dbName + char(13) +
' SET SINGLE_USER WITH  ROLLBACK IMMEDIATE ' + char(13)  + char(13)
SET @sqlRestoreDb  = @sqlRestoreDb + ' RESTORE DATABASE ' +  @dbName + char(13) +
' FROM DISK = ''V:\SQL\Backup\Daily\' + @dbName + '\'+  + @backupFile  + ''''+ char(13)+
 ' WITH  MOVE N''' + @dbName + ''' TO  N''E:\SQL\Data\' + @dbName + '.mdf'','  + char(13)+
 ' MOVE N''' + @dbName + '_log'' TO  N''L:\SQL\Data\' + @dbName + '.ldf'','  + char(13)+
 ' REPLACE, STATS = 10 ' +  char(13)
 
SET @sqlRestoreDb  = @sqlRestoreDb  + 'ALTER DATABASE ' +  @dbName + char(13) +
' SET MULTI_USER WITH  ROLLBACK IMMEDIATE ' + char(13)
 

print @sqlRestoreDb
exec sp_executesql @sqlRestoreDb;
FETCH NEXT
FROM @curClientCode into @db
END
CLOSE @curClientCode
DEALLOCATE @curClientCode

GO
      

query sql error log

Grab the information of sql error log in a table and query


--gather all the error in a temp table and query the temp table to find the specific error by text search or date range

CREATE TABLE #SQLErrorLog



(
 LogDate DATETIME,

ProcessInfo VARCHAR(50),

Text VARCHAR(1500)



)
 GO
 INSERT INTO #SQLErrorLog

EXEC xp_readerrorlog 0



go
 INSERT INTO #SQLErrorLog

EXEC xp_readerrorlog 1



go
 INSERT INTO #SQLErrorLog

EXEC xp_readerrorlog 2



go
 INSERT INTO #SQLErrorLog

EXEC xp_readerrorlog 3



go
 INSERT INTO #SQLErrorLog

EXEC xp_readerrorlog 4



go
 INSERT INTO #SQLErrorLog

EXEC xp_readerrorlog 5



go


 SELECT * FROM #SQLErrorLog

WHERE LogDate >= CONVERT(datetime,'06/08/2015') AND LogDate < CONVERT(datetime,'06/20/2015')

and Text LIKE '%failed%' OR Text LIKE 'Error:%'

ORDER BY LogDate DESC

DROP TABLE #SQLErrorLog

script: How to find logical and physical file names of the database

SELECT DB_NAME(database_id) AS DatabaseName, name AS LogicalFileName, physical_name AS PhysicalFileName
FROM sys.master_files AS mf

Error: Could not continue scan with NOLOCK due to SQL Server data movement

Ran  the following

DBCC CHECKDB(MY_DATABASE) WITH PHYSICAL_ONLY
I got table error something like below

Msg 8909, Level 16, State 1, Line 1
Table error: Object ID 0, index ID -1, partition ID 0, alloc unit ID 0 (type Unknown),
page ID (1:219356) contains an incorrect page ID in its page header.
The PageId in the page header = (0:0).
Msg 8909, Level 16, State 1, Line 1
Table error: Object ID 0, index ID -1, partition ID 0, alloc unit ID 144115188075921408

So I ran the following

USE [master]
GO
ALTER DATABASE [MY_DATABASE] SET SINGLE_USER WITH ROLLBACK IMMEDIATE
GO
USE [DATABASE]
GO
DBCC CHECKTABLE(MY-Badtable, 'REPAIR_REBUILD')
GO
ALTER DATABASE [MY_DATABASE] SET MULTI_USER WITH ROLLBACK IMMEDIATE

Then  ran the following again
DBCC CHECKDB(MY_DATABASE)


This worked, no errors!

Find database lock

IF EXISTS(SELECT request_session_id FROM sys.dm_tran_locks

WHERE resource_database_id = DB_ID('Model'))

PRINT 'Model Database being used by some other session'

ELSE

PRINT 'Model Database not used by other session'


---to see what is locking up the database
SELECT request_session_id FROM sys.dm_tran_locks

WHERE resource_database_id = DB_ID('Model')