My case is the following one:. I have a. I have tried to import it into SQL server with the following command:. The generated files A.
It can be running for hours. Which would be the best way of restoring this. All you can do it wait. How long have you waited? We have a table that we use that only keeps 2 years worth of data, so it can delete thousands of rows every night that are more than 2 years old.
What about shrinking the log file? What are opinions here? I have a gig DB with a gig log. The DB has a nightly full backup, with incrementals and transaction logs throughout the 24 hours. Yeah, a GB log file sounds problematic. It is a large vendor product. Backup times are quick. I have run a health check and so has my product support vendor. Reorgs and rebuilds run on the weekends. Other ideas?
I really put a lot of work into that so that it could give you personalized advice for your own system, way beyond what I can do in a blog post comment. Give that a shot. I hate everything Microsoft in the server space and this fast tracked me in the right direction as to why our MSSQL server was running out of space every four months.
I just dropped some unused tables and purged some old data. This database is copied to six other environments, and that takes time, network resources, and drive space. Am I not supposed to shrink it?
And even if we did, we would still benefit from the savings in maintenance window time, network traffic, and drive space now. Most of us have to deal with rapidly growing databases, especially in this hyped-up age of Big Data. No, I do not regularly shrink databases. My concern is that when a recognized authority such as yourself advises to never shrink databases, the presents potential problems when I suggest that we do so. So a small caveat explaining the rare times when it is appropriate to shrink a database would be a welcome addition to the article.
Yes: If you have to shrink your databases frequently then you have an underlying issue that should be addressed and you are just putting a band aid on it. But I believe there are acceptable applications of the shrink feature. One-time shrinks seem to be ok when they are being used to resolve a rare failure.
Hi Brent, I just have a question. We recently purge 1,5 millions of record from a table. How can we do it? Thanks in advance! Now how I can reclaim disk space?
Any option apart from data file shrinking? That way, when you archive an old partition, you can simply drop the old filegroup. Presto, instant space reclamation with zero fragmentation. Hi Brent, in my case, my backups are taking way too long. Start with conventional backup performance tuning, like using compression, writing to a fast target, striping across 4 files, etc.
Please stay us up to date like this. These days, we are running VMware esxi on flash storage, to where, autogrowing a file takes milliseconds and shrinking a database has FAR few repercussions it used to have. I run an chassis datacenter. As an Infrastructure Director, we will lose money is these sorts of scare-tactics actually affect customers these days. What DOES affect customers though is the ever-increasing data footprints they have because they have been scared into NOT shrinking their datafiles.
Unbeknownst to them, some employee who does not have SQL training is running ODBC to this db and constantly screws up queries that lock up the server, so the log file grows and grows and never gets reclaimed. Furthermore, this may be something done ONCE, 5 years ago…yet the infra guys have to provision for it?
THEN and only then will you get insight into what processes influence it. This simply does not apply today in anything other than the largest datacenters and most inexpensive home-labs. SAS drives. If autogrowth happens, you have a lot less places to look as to why they got so big in the first place.
Adjust accordingly. Brent… I have a database that we need to make static, and share out to developers. I have a situation with Database size. Then that data goes into production tables. Our staging tables store much more data then we actually import but we need to store the data as it comes from the client initially.
After the data in saved to prod tables we can remove the staging data. Unfortunately, we need to keep the original data around for 3 months while we finish the implementation. Once we go live we can purge the old staging data.
During the staging process the DB can grow more then 2 -3 times its normal running size. Changing the application at this point is a major undertaking. Once we purge the staging data we have a database that is huge 2tb while normal size would be about gb. We have over dbs. Would this be a situation where shrinking would be an acceptable exception? With autogrow set, our log files grow quite large during especially at the end of month were a lot of transactions are done in short period of time.
I do have a log backup scheduled every 15 minutes but sometimes it is not enough to catch the overload of data movement. So … the log files are growing a lot and even after the log backup and full backups they stay at the same size unless shrinked.
With over databases in the server and not all log files growing at the same time, sometimes disk space is low. What your option on this?? Now at the end of the month I have another log file that will grow to GB because of major transactions, this brings my drive to GB close to full not counting the other log files and like the first log file, after the major transactions done, the log file will go back to 50GB of daily flow. I am making this quite simple but in reality I am dealing with drives of 1TB for my log files when in reality I could work with GB drives just because the logs grow but not at the same time.
And this is for only one server. Take care. Performance does matter, I shrink the log file during off hours times. But I do understand you point that when the log need to grow back again it will impact the performance. Your email address will not be published. Don't subscribe All Replies to my comments Notify me of followup comments via e-mail. You can also subscribe without commenting. Post Comment. Want to advertise here and reach my savvy readers? Stop Shrinking Your Database Files.
Last Updated October 9, Brent Ozar. Production Database Administration. Epic Advice Fail SQL Server Magazine just tweeted about their latest article, a reader-submitted solution on how to shrink your database files with ease. Leave new Aaron Bertrand.
Please stop telling people they should rhink their log files! Brent Ozar. Allen McGuire. How to reduce the transaction log file size without shrinking in sql server? The largest table size is 8GB. Joe Gambill. Steve Mangiameli. You have better bigger more important things to do than reclaim space. Simon Holzman. Any thoughts other than tearing up my DBA Card?
Coach James. This article makes me more angry than the article author is. Parvinder NIjjar. Michael Spurlock. When is Microsoft going to address this dog-ass design? Allen M McGuire. Tim seedorf. Situations dictate. Paul Randal. Dave Schutz. BradC put it quite well.
Michael Swart. Nick Bialaszewski. Aaron Bertrand. The main problems highlighted are: 1. Then maybe the title of the article and most of the contents should be rephrased. Mike Walsh. Doing this will help you control your Virtual Log Files which could have a performance impact. Jeff Weisbecker. Mixed data pages or mixed extents? Das Fantom. Carlton B Ramsey.
Ignacio Salom. Carter Lines. Dan Bracuk. What is your opinion on this matter? Paul Berberich. Which other database platforms are doing that? Kim Brown. Juel von Wasgenstein. Hi Brent… I agree the shrinkfile is abused and inappropriately recommended.
Suzanne, that is a case where you can shrink them down to a proper size. Dennis M. Karl von mecklenburg. All work and no play makes Jack a DBA. Missed it all together. James Anderson. I do not shrink my log files. Tom Pfister. Hello Brent, I am supposed to restore production databases onto development servers. Sincerely, Craig. Craig Efrein. Scott C. Mike — I think I understand what you are trying to say.
Brent, I have an issue and have read all of the competing views on the subject and am hoping you can provide your take on the problem. Thanks, JD. Kendra Little. Test it all out and just see which process works better for you. Kendra, Thank you for the thorough reply.
If you must shrink, shrink file. It gives you more granular control. As for a script…you should be able to figure it out based on the info here. Am I wrong? Sean Redmond. Once that was fixed the problem went away. Hi Brent, Fair enough, I suppose. Thanks for the swift reply. Doran Mackay. Thanks for your observations. David Shipley. Eventually, I managed to get the BizTalk admin to clean up his application.
On the bright side, I do have the ability to allocate more disk space to that database instance. Stephen Mangiameli. Reclaim your space with a clear conscience my son and go in peace. Kay Masters. But, then again you took my comment so personally that you could only reply by belittling. Peace dude. Fiduciary Blind Spot. Bas de Zwart. And now you made me do it. You made me reply. Performance is not. Enjoy your learning journey! Opportunity costs! I apologize for not seeing that point sooner.
We do not shrink LOG files, no need. I think that this post was focused on production environments. It makes sense in that context. Hello Brent! Hi Brent, My team is genuinely curious as to your thoughts on our specific situation. Best of luck. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Monitor log space use Monitor log space use by using sys. Important Avoid overloading the log disk.
Note Factors such as a long-running transaction, that keep VLFs active for an extended period, can restrict log shrinkage or even prevent the log from shrinking at all. Important Before shrinking the transaction log, keep in mind Factors that can delay log truncation. Is this page helpful? Yes No. Any additional feedback? Skip Submit.
You will lose any transaction information. Then you can shrinkfile with no issue. How to shrink the transaction log. When configuring your database with the Simple recovery model , the SQL Server Transaction Log will be marked as inactive and truncated automatically after committing the active transaction. This is not the case with the Full and Bulk-Logged database recovery models. When the database is configured with Full recovery model, the SQL Server Transaction Log in the Transaction Log file will be marked as inactive after committing the transaction, without being truncated automatically, as it will be waiting for a Transaction Log backup to be performed.
If no Transaction Log backup is taken from the database, the Transaction Log file will grow continuously , without truncation, until it runs out of free space. The recovery model of the database can be checked form the Options tab of the Database Properties window, as below:.
If you try to take Transaction Log backup for a database that is configured with the Simple recovery model, the backup operation will fail with the error message below:. In addition, the Transaction Log backup requires that at least one Full backup is taken from that database as a start point for the new backup chain.
If you try to take a Transaction Log backup from a database with no Full backup taken previously, the backup operation will fail with the error message below:. Once the database Full backup is performed, we will start taking the Transaction Log backups for the database. The first Transaction Log backup will take a backup for all the transactions that occurred in the database since the last Full backup.
On the other hand, the Transaction Log backups that follows the first Transaction Log backup will take backup for all transactions that occurred in the database since the point that the last Transaction Log backup stopped at.
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