Log File Growth

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Log File Growth

santoshkal

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Points: 497
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September 23, 2014 at 5:00 am

#296819

Hi,
One of the database log file is having only 12% space free which is in full recovery model but when i exec dbcc sqlperf(logspace) its shows 1.87% only used we are in DWH environment & don't take any log backups
what should i need to do ??
Thanks

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Ed Wagner SSC Guru Points: 287026 More actions · Answer 1

Here's a good series on transaction log management: http://www.sqlservercentral.com/stairway/73776/

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dbafromthecold@gmail.com SSChampion Points: 10160 More actions · Answer 2

If you database is in the full recovery mode, you need to be taking regular log backups.

Where are you getting the 12% free space figure from?

Gail Shaw SSC Guru Points: 1004504 More actions · Answer 3

santoshkal (9/23/2014)
One of the database log file is having only 12% space free which is in full recovery model but when i exec dbcc sqlperf(logspace) its shows 1.87% only used we are in DWH environment & don't take any log backups

There's your problem right there.

Full recovery model is for when you need point-in-time recovery and intend to take log backups to allow that. If you don't need point-in-time recovery, then the DB should be in simple recovery model.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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santoshkal SSC-Addicted Points: 497 More actions · Answer 4

ya its Simple recovery model ... we have a support team who monitors the size

DatabaseSizeUnallocatedSizeAllocatedSizeAvailableSpaceAvailableSpaceIn%MaxSize

2.891299 0.179775 2.711523 17.28848 86.44238 20

Num_Of_TablesLogFileSizeLogFileUsedSizeAvailableLogSizeInPercent

29 1007608 891647 12

dbafromthecold@gmail.com SSChampion Points: 10160 More actions · Answer 5

From what you posted, the first script shows that your database has 86% space free overall (including your log file),

The second output shows that you have 12% in your log file, but you're getting a different figure? Are the scripts being run on the same database, at the same time?

santoshkal SSC-Addicted Points: 497 More actions · Answer 6

yes data base is same ...

how to check the used log space ? any script ?

Thanks

dbafromthecold@gmail.com SSChampion Points: 10160 More actions · Answer 7

This will show you the bytes in use in each of the transaction logs in the databases on the system:-

USE [master];

GO

SELECT

DB_NAME(database_id) AS [Database],

SUM(database_transaction_log_bytes_used_system) AS [System Bytes Used],

SUM(database_transaction_log_bytes_used) AS [Bytes Used]

FROM

sys.dm_tran_database_transactions

GROUP BY

DB_NAME(database_id)

ORDER BY

DB_NAME(database_id) ASC