DB Engine :: Why Does Log File Grow When Recovery Mode Is Simple
Jul 30, 2015
My understanding is that the log file is not supposed to grow if the database is under simple recovery mode.I am in a situation where the log grows if do any inserts that involve millions of rows.How do i make sure that it does not grow?
On SQL 2000, if I have a large transaction log for my database and I manage to fill it with a single large transaction but it is not set to autogrow, what happens?
I have several databases that perform daily backups. Ever since I installed SP2, the backup jobs are failing. The logs state that it's because the database recovery mode cannot be SIMPLE, but need to be either FULL or Bulk-Logged.
Can anyone tell me if this is true, and that I do have to change my recovery mode?
Here's the error:
NEW COMPONENT OUTPUT Microsoft(R) Server Maintenance Utility (Unicode) Version 9.0.3042 Report was generated on "ICIS-SQL-SERVER". Maintenance Plan: DB Backup Duration: 00:08:05 Status: Warning: One or more tasks failed.. Details: Back Up Database (Transaction Log) (ICIS-SQL-SERVER) Backup Database on Target server connection Databases that have a compatibility level of 70 (SQL Server version 7.0) will be skipped. Databases: All user databases Type: Transaction Log Append existing Task start: 2007-03-10T05:08:09. Task end: 2007-03-10T05:08:09. Failed:(-1073548784) Executing the query "BACKUP LOG [hl7 db_SamirTesting] TO DISK = N'D:\mssql\backup\hl7 db_SamirTesting\hl7 db_SamirTesting_backup_200703100508.trn' WITH NOFORMAT, NOINIT, NAME = N'hl7 db_SamirTesting_backup_20070310050809', SKIP, REWIND, NOUNLOAD, STATS = 10 " failed with the following error: "The statement BACKUP LOG is not allowed while the recovery model is SIMPLE. Use BACKUP DATABASE or change the recovery model using ALTER DATABASE. BACKUP LOG is terminating abnormally.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.
Command:BACKUP LOG [hl7 db_SamirTesting] TO DISK = N''D:mssqlackuphl7 db_SamirTestinghl7 db_SamirTesting_backup_200703100508.trn'' WITH NOFORMAT, NOINIT, NAME = N''hl7 db_SamirTesting_backup_20070310050809'', SKIP, REWIND, NOUNLOAD, STATS = 10 GO BACKUP LOG [dg_efilm_153] TO DISK = N''D:mssqlackupdg_efilm_153dg_efilm_153_backup_200703100508.trn'' WITH NOFORMAT, NOINIT, NAME = N''dg_efilm_153_backup_20070310050809'', SKIP, REWIND, NOUNLOAD, STATS = 10 GO BACKUP LOG [hl7 db] TO DISK = N''D:mssqlackuphl7 dbhl7 db_backup_200703100508.trn'' WITH NOFORMAT, NOINIT, NAME = N''hl7 db_backup_20070310050809'', SKIP, REWIND, NOUNLOAD, STATS = 10
Back Up Database (Transaction Log) (ICIS-SQL-SERVER) Backup Database on Target server connection Databases that have a compatibility level of 70 (SQL Server version 7.0) will be skipped. Databases: All user databases Type: Transaction Log Append existing Task start: 2007-03-10T05:08:09. Task end: 2007-03-10T05:08:09. Failed:(-1073548784) Executing the query "BACKUP LOG [dg_efilm_153] TO DISK = N'D:\mssql\backup\dg_efilm_153\dg_efilm_153_backup_200703100508.trn' WITH NOFORMAT, NOINIT, NAME = N'dg_efilm_153_backup_20070310050809', SKIP, REWIND, NOUNLOAD, STATS = 10 " failed with the following error: "The statement BACKUP LOG is not allowed while the recovery model is SIMPLE. Use BACKUP DATABASE or change the recovery model using ALTER DATABASE. BACKUP LOG is terminating abnormally.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.
Command:BACKUP LOG [hl7 db_SamirTesting] TO DISK = N''D:mssqlackuphl7 db_SamirTestinghl7 db_SamirTesting_backup_200703100508.trn'' WITH NOFORMAT, NOINIT, NAME = N''hl7 db_SamirTesting_backup_20070310050809'', SKIP, REWIND, NOUNLOAD, STATS = 10 GO BACKUP LOG [dg_efilm_153] TO DISK = N''D:mssqlackupdg_efilm_153dg_efilm_153_backup_200703100508.trn'' WITH NOFORMAT, NOINIT, NAME = N''dg_efilm_153_backup_20070310050809'', SKIP, REWIND, NOUNLOAD, STATS = 10 GO BACKUP LOG [hl7 db] TO DISK = N''D:mssqlackuphl7 dbhl7 db_backup_200703100508.trn'' WITH NOFORMAT, NOINIT, NAME = N''hl7 db_backup_20070310050809'', SKIP, REWIND, NOUNLOAD, STATS = 10
Back Up Database (Transaction Log) (ICIS-SQL-SERVER) Backup Database on Target server connection Databases that have a compatibility level of 70 (SQL Server version 7.0) will be skipped. Databases: All user databases Type: Transaction Log Append existing Task start: 2007-03-10T05:08:09. Task end: 2007-03-10T05:08:09. Failed:(-1073548784) Executing the query "BACKUP LOG [hl7 db] TO DISK = N'D:\mssql\backup\hl7 db\hl7 db_backup_200703100508.trn' WITH NOFORMAT, NOINIT, NAME = N'hl7 db_backup_20070310050809', SKIP, REWIND, NOUNLOAD, STATS = 10 " failed with the following error: "The statement BACKUP LOG is not allowed while the recovery model is SIMPLE. Use BACKUP DATABASE or change the recovery model using ALTER DATABASE. BACKUP LOG is terminating abnormally.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.
Command:BACKUP LOG [hl7 db_SamirTesting] TO DISK = N''D:mssqlackuphl7 db_SamirTestinghl7 db_SamirTesting_backup_200703100508.trn'' WITH NOFORMAT, NOINIT, NAME = N''hl7 db_SamirTesting_backup_20070310050809'', SKIP, REWIND, NOUNLOAD, STATS = 10 GO BACKUP LOG [dg_efilm_153] TO DISK = N''D:mssqlackupdg_efilm_153dg_efilm_153_backup_200703100508.trn'' WITH NOFORMAT, NOINIT, NAME = N''dg_efilm_153_backup_20070310050809'', SKIP, REWIND, NOUNLOAD, STATS = 10 GO BACKUP LOG [hl7 db] TO DISK = N''D:mssqlackuphl7 dbhl7 db_backup_200703100508.trn'' WITH NOFORMAT, NOINIT, NAME = N''hl7 db_backup_20070310050809'', SKIP, REWIND, NOUNLOAD, STATS = 10
Back Up Database (Transaction Log) (ICIS-SQL-SERVER) Backup Database on Target server connection Databases that have a compatibility level of 70 (SQL Server version 7.0) will be skipped. Databases: All user databases Type: Transaction Log Append existing Task start: 2007-03-10T05:08:08. Task end: 2007-03-10T05:08:09. Failed:(0) Database 'hl7 db_SamirTesting' will not be backed up because it does not have its recovery model set to Full or BulkLogged.
Back Up Database (Transaction Log) (ICIS-SQL-SERVER) Backup Database on Target server connection Databases that have a compatibility level of 70 (SQL Server version 7.0) will be skipped. Databases: All user databases Type: Transaction Log Append existing Task start: 2007-03-10T05:08:08. Task end: 2007-03-10T05:08:09. Failed:(0) Database 'dg_efilm_153' will not be backed up because it does not have its recovery model set to Full or BulkLogged.
Back Up Database (Transaction Log) (ICIS-SQL-SERVER) Backup Database on Target server connection Databases that have a compatibility level of 70 (SQL Server version 7.0) will be skipped. Databases: All user databases Type: Transaction Log Append existing Task start: 2007-03-10T05:08:08. Task end: 2007-03-10T05:08:09. Failed:(0) Database 'hl7 db' will not be backed up because it does not have its recovery model set to Full or BulkLogged.
Back Up Database (Full) (ICIS-SQL-SERVER) Backup Database on Target server connection Databases that have a compatibility level of 70 (SQL Server version 7.0) will be skipped. Databases: All databases Type: Full Append existing Task start: 2007-03-10T05:00:06. Task end: 2007-03-10T05:08:08. Success Command:EXECUTE master.dbo.xp_create_subdir N''D:mssqlackupmaster'' GO EXECUTE master.dbo.xp_create_subdir N''D:mssqlackupmodel'' GO EXECUTE master.dbo.xp_create_subdir N''D:mssqlackupmsdb'' GO EXECUTE master.dbo.xp_create_subdir N''D:mssqlackuphl7 db_SamirTesting'' GO EXECUTE master.dbo.xp_create_subdir N''D:mssqlackupdg_efilm_153'' GO EXECUTE master.dbo.xp_create_subdir N''D:mssqlackuphl7 db'' GO BACKUP DATABASE [master] TO DISK = N''D:mssqlackupmastermaster_backup_200703100500.bak'' WITH NOFORMAT, NOINIT, NAME = N''master_backup_20070310050006'', SKIP, REWIND, NOUNLOAD, STATS = 10 GO BACKUP DATABASE [model] TO DISK = N''D:mssqlackupmodelmodel_backup_200703100500.bak'' WITH NOFORMAT, NOINIT, NAME = N''model_backup_20070310050006'', SKIP, REWIND, NOUNLOAD, STATS = 10 GO BACKUP DATABASE [msdb] TO DISK = N''D:mssqlackupmsdbmsdb_backup_200703100500.bak'' WITH NOFORMAT, NOINIT, NAME = N''msdb_backup_20070310050006'', SKIP, REWIND, NOUNLOAD, STATS = 10 GO BACKUP DATABASE [hl7 db_SamirTesting] TO DISK = N''D:mssqlackuphl7 db_SamirTestinghl7 db_SamirTesting_backup_200703100500.bak'' WITH NOFORMAT, NOINIT, NAME = N''hl7 db_SamirTesting_backup_20070310050006'', SKIP, REWIND, NOUNLOAD, STATS = 10 GO BACKUP DATABASE [dg_efilm_153] TO DISK = N''D:mssqlackupdg_efilm_153dg_efilm_153_backup_200703100500.bak'' WITH NOFORMAT, NOINIT, NAME = N''dg_efilm_153_backup_20070310050006'', SKIP, REWIND, NOUNLOAD, STATS = 10 GO BACKUP DATABASE [hl7 db] TO DISK = N''D:mssqlackuphl7 dbhl7 db_backup_200703100500.bak'' WITH NOFORMAT, NOINIT, NAME = N''hl7 db_backup_20070310050006'', SKIP, REWIND, NOUNLOAD, STATS = 10
For one of our database we have an issue where its log file got increased rapidly last week on Fri and Sat. The database is on SQL server 2008 R2 with compatibility level at 80. Please see below log grow events :
First, we thought Index maintenance like Re-index and update stats could have been the reason, but when check the schedule that job ran on 16th using below code:
USE ABC GO EXEC sp_MSforeachtable @command1="print '?' DBCC DBREINDEX ('?', ' ', 80)" GOEXEC sp_updatestatsGO
I know above is OLD fashioned, but we believe that should not be the major cause here? How can i determine what happened on 14th and 15th which cause the event to trigger and log file bumps to 80 and 70 GB both days.
What is the impact of changing the recovery mode of a database from Full to simple? The client I am at has set their database to full recovery mode, set their log files to grow automatically. But I don't think they have ever done a backup of their transaction log (it has grown to over 19Gig, where the data portion of the database is only around 400M).
What is the impact of truncating the transaction log now? After truncating it, i would like to shrink the file to a managable number and change the recovery mode to simple (they don't need transaction log backups)
When we do a full database backup manually, we are seeing the trn file reflect the current date/time, but we are not seeing the mdf reflect the new date/time. And we are not seeing the transaction log file decrease in size. the recovery mode is set to full, do we need to change to simple to see both the mdf being backup'ed?
hi, we have a SQL Server 2000 database which we set to 'SIMPLE' recovery mode at 6pm (due to nightly large data loads). We revert back to 'FULL' recovery mode at 6am.
My understanding was that in 'SIMPLE' recovery mode, the transaction log would not grow because it would automatically be truncated after a checkpoint. However this is not the case. I thought perhaps it could be due to a long running uncomitted transaction, but when I ran 'dbcc opentran', the oldest running transactions doesn't last for more than a couple minutes. I manually run a 'checkpoint' command as well in the hope of forcing the transaction log truncation. I repeat this a couple of times to no avail. When I run 'dbcc sqlperf(logspace)' , I can still see the transaction log growing.
It is not until I run 'backup log db with truncate_only' that the transaction log gets truncated. I do not understand, why the transaction log does not get automatically truncated in SIMPLE recovery mode?
I have a small, ~10GB SQL 2008 R2 database, that was setup with simple recovery. We do full backup each night at midnight when no one is using the database. Is there any problems with doing differential backups during the day when users may be writing to the database? Could I even do hourly differential backups while users are using the database? I'm conflicted about switching over to full recovery mode and using transaction logs to have the ability restore data between backups. If I can do a couple daily differential backups while users are using the database during the day, in addition to our nightly full backups, than I live with simple recovery mode.
Wondering whether I can have following included in a script file:
1. set the current single user db from Full to Simple recovery mode. 2. Checkpoint and shrink the transaction log file (release all unused space) 3. set the current single user db from Simple recovery to Full recover mode.
The DB is in simple recovery mode. There are no open transactions (used dbcc opentran).
The server is running SQL Server 2014 and the DB is in compatibility mode SQL Server 2008 (100). It was upgraded to 2014 a month or two ago.
I have tried to re-size the log to 100mb, but any way I have tried (none gave errors), the log file remains the same size. I have tied to shrink the log file (through the UI and via DBCC commands) without success; no errors, but also no change in file size.
I have checked Log Reuse Waits, just in case, and as expected it showed “NOTHING” (select log_reuse_wait_desc, name from sys.databases)
I tried running a checkpoint, but that did not allow any resize or shrink to work.
I have tied creating large transactions to move the used point in the log file, in case this was the issue. I did this by creating tables that I drop after large inserts. While it shows me that the log space % used increased, the log file still does not allow the space to be reduced.
The following is what I was using for the transactions to get the log used.
BEGIN TRAN select a.* into testtable from sysobjects a, sysobjects b, sysobjects c ROLLBACK TRAN
Do I just need to continue running large transactions until the log space used gets high enough to get the “end point” in the log to really move? Is there an easier way to accomplish this (I have several DBs that have the almost identical problem), what I am using moves the Log Space Percent Used about a percent on each execution.
Hi ,I have set up my database to be using "Simple" mode. This will not log anytxns ?I have got the err message saying the log file is full and i need to do atxn log backupi do not understand why , could anyone kindly advise ?tks & rdgs--Message posted via SQLMonster.comhttp://www.sqlmonster.com/Uwe/Forum...eneral/200510/1
Have a database that's in "Simple" recovery mode whose .ldf has grown to 270GB. This database is a data warehouse so "full" is not required. I put it in simple mode a month ago and shrunk the log down and now it's filled up the disk.
What steps can I take to mitigate this in future? I've read that this is caused by long running transactions which fill the log for DR purposes. Should I put the database back into full mode and backup/truncate daily.
The auto-growth is set to 128MB which is very low.
Hi all,I have a SQL Server 2000 database that is using the Full recoverymodel. The database is purely receiving inserts (and plenty of them)with maybe some view/table creation for reporting.In this state I would expect the log to grow ad infinitum but it getsto about 32% used and then empties.The log is not being backed up at all so am I missing something else?CheersDee
One of our database is in simple recovery model, and usually generating more than 220 GB log file (.ldf) every week. We are shrinking log file many times to release the space.
But as its not advisable I am looking for any other options. I suggested to change the recovery model to Full and start T-log backup, but client dont want to change recovery model.
Is there any way to manage Log file of Simple recovery model to maintain disk space?
Bear with me - My SQL Server 2005 Maintenance is as good as a Newbie..
I was running a Very Large Transaction over the weekend (Say 10Mill Inserts).. And after waiting for 3/4 Hrs for the transaction to complete -- Checked the LDF File, I has grown to a 100 GB.
After that i discovered that i had the Recovery Model as FULL .. So Killed the Job and Changed the recovery mode from Full -> Simple.
Now i see that the LDF file is not growing in size even though there are many transactions that were complete successfully (Still Very slow though)...
What am i missing here - Iam clueless as to why my LDF is not growing in size?
I'm running a long and heavy query. during the running the log file of the DB is growing more than 20 GB and i'm running out of disk space consequently. Is there a way to restrict the log file size without demaging my query?
We have 300+ databases on one sinlge server (SQL 2005). If I need to change recovery mode from full to simple for all of them, is there any way to do so? Please advice.
I have a db running under simple recovery mode. I am really pressed at disk space, and we have a long running script that keeps failing with "no space left on the device" error. I noticed the log file is very large. I plan to set the max log file size but at the same time I want to know that the database is in the log-truncate mode - perhaps from the database itself. Is there any metadata that could tell me this?
By default, distribution database is set to simple recovery mode. Why ? Should this be changed to full ? how often should transaction logs be taken ? What is the recommendation ?
I've been through the forum and read a number of threads on people's DBs not growing and the answer usually is they don't have auotmatically grow data file. Unfortunately I have this on, but when I look at the properties of the database it reports the space available is 0.00 MB? Up until about two weeks ago I was showing appx 48% space utilization. When I ran an SP to show growth, it tells me that it was expanded by 20% yesterday, but SQL Server is still telling me the space available is zero.
The log file is also set for auto growth. The DB is 14.5 GB in size and the drives still have around 92 GB of space.
Has anyone experienced this before? Any ideas? Does anyone know of an SPs that can give me detailed info on internal data file size compared to stated size (i.e. wasted space in data file)? Is SQL Server doing something funny in the way it is seeing the database or data files individually? Any help is appreciated.
My primary (and only) data file has reached the point where it is auto growing. I would like to grow this file in one big chunk at an off peak time. I can't seem to find the code I need to make the file grow when I want it to?