WRITELOG Lock On Databases Set To SIMPLE Recovery
Jul 23, 2005
Hi All,
I have a 2MB database set to SIMPLE recovery. This database is used
only to generate new keys to web users. It has two columns - UID and
LASTDATE. The UID column is only updated when users log in or log out
(INSERT & DELETE). The LASTDATE column is updated every time they
switch between pages.
Please don't ask for the reason why we do it this way, it just IS.
The maximum amount of rows in this table at any given time is about
2000. There is a non-clustered index on the UID column.
My problem is that all throughout the day I have constant blocks by the
WRITELOG waittype. I know my disk I/O is very slow (will be upgraded
soon) but this is the only database on which these blocks occur. What
is writing to the transaction log if I have the DB set for SIMPLE
recovery?
Thanks,
Josh
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Feb 8, 2008
When I create a database, is there a way to make sure that the default recovery model is Full instead of Simple?
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Sep 19, 2015
We have 3 replica AG setup. 2 replicas are in sync/automatic failover, the other(DR Server, different subnet) in asynchronous/manual mode…All these replicas were on sql server 2012, Recently we upgraded DR server to 2014. Since then we have a problem, the AG databases in 2014 instance went into ‘Synchronizing/ in recovery’ state…The SQL server error log has message, the recovery couldn’t start for the database ‘XYZ’…We tried to create a new database and add it to AG , it works for fine for other two 2012 replicas, but on 2014 we see the same issue
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May 29, 2015
My Database has many Dead lock issues,Will this Dead locks cause Differential database failure ?.
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Mar 17, 2006
HiIn my server (MSSQL 2000 sp4) very often I see long time of executing querywith waittype=WRITELOGRecovery is set to SIMPLE and there is no autoShrink.Auto increment file size (log) is set to 10%What can be the reason of this problem?Marek
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Jun 5, 2007
Hi,
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?
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Jan 18, 2008
We are using a .bat script to restore several client dbs onto our sql server 2000 db. We want to set the client dbs from full recovery to simple. What command should I use in the .bat file to make this change?
.bat file ==
:: Second, restore data from SQL Server backup file to SQL server...
isql -E -S ao3ao3 -Q "RESTORE DATABASE CBSN FROM DISK = 'D:MARS_SYSDATAUPDATESCBSNCBSN.BAK' WITH MOVE 'MEDISUN_BCNV_Data' TO 'D:SQLDATACBSN_data.mdf', MOVE 'MEDISUN_BCNV_Log' TO 'D:SQLDATACBSN_log.ldf',REPLACE;"
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Jul 31, 2006
We have a fairly large database that we use to store mom alerts and it stopped alerting as it's transaction log became full. I suggested to the owner of the database to set the simple recovery model so the log could automatically be truncated. However, it appears that the database is frequently reaching it's limit (of 3gb) and I'm having to set the limit even higher on a daily basis. Can anyone tell me why this is occuring? I understood that when the log file reaches 70% it should automatically shrink?
Kind Regards
Mike
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Mar 12, 2007
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
Please help,
-tim
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Jun 26, 2002
Hi,
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)
Any info on this would be appreciated.
Thanks in advance
Jim
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Oct 14, 2005
I need a sql statment to return a list of tables for a given databasewhere the Recovery Model option is Simple.TIARob
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Jun 10, 2006
Hi MVPS/MS Experts:
Pardon me and my ignorance for asking this question. I just want to understand the backup architecture more clearly. According to BOL (both in SQL 2k and SQL 2k5) in simple recovery mode trasaction log backup is not possible since the log is truncated on checkpoint which is true. Also we know that FULL backup backups both the db and transaction log as well.
My question is what happens when a database is in simple recovery mode and a full backup is done. since the tran log cannot be backed up does only the db backup is done when a full backup is done?. What exactly happens behind the scenarios?. Is it that only the active log gets backed up when a full backup is done in simple recovery mode?. I am trying to understand how a full backup in simple recovery mode behaves without contradicting the full backup architecture and that the veracity of the statement (both db and tran log backup in full backup mode) holds true for a simple recovery scenario.
MVPs/ MS Experts if you could Please explain it in detail, I would really appreciate it.
Thanks
Ankith
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Feb 27, 2006
I've come across several references indicating that the recovery model can be set to simple by using the following sql statement:
ALTER DATABASE dbname SET RECOVERY SIMPLE
However, all I get is the error message below. What is the correct syntax?
Msg 102, Level 15, State 1, Line 1
Incorrect syntax near '.'.
Msg 195, Level 15, State 7, Line 1
'recovery' is not a recognized SET option.
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May 2, 2015
DB replication can set db recovery model to simple ,why db mirror can not db recovery model to simple.
DB mirror must be set to full recovery model.
As far as I know, whatever db mirror and db replication ,there is a log reader to read the log in the ldf file DB mirror and DB replication are almost the same principle to replicate the db to another db server.
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Jun 18, 2007
I have convert all databases to Full from Simple Recovery model.
As per documentation, it looks like simple.
Based on your experiences , do you think of any problem may come while doing this ?
Any impact on application performance after this ?
Is this work perferened to do when no body using system ?
Thanks
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Feb 14, 2007
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?
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May 16, 2007
On SQL 2000 or SQL20005 will a database's log file automatically be truncated if the database is on simple recovery model?
The reason I ask is that we have a database (simple recovery) that keeps growing its logfile each weekend which causes disc space problems.
I am kinda new to SS but from the reading in BoL I've done was under the impression that for simple recovery model log records are only needed until the transaction has been written to disc and committed, and that SS will handle truncating obsolete records from the log where necessary.
I'm doing DBCC SQLPERF(logspace) which shows this first thing on a Monday morning:
Database Name Log Size (MB) Log Space Used (%)
-------------- --------------- ---------------------
myDB 4841.93 99.19465
Note the size of the log file - the data file is only 700MB!
Issuing a DBCC OPENTRAN doesn't show any open transactions, and a CHECKPOINT doesn't do anything to reduce the log space used (which if there were dirty records in the log still not written to disc this ought to do shouldn't it?).
The database is only written to as a replication subscriber.
Any suggestions what would be causing the log file to fill up?
At the moment I'm resorting to BACKUP LOG myDB WITH TRUNCATE_ONLY and considering scheduling this as an hourly job over the weekend - any reasons why this could be a bad idea?
Many thanks,
Moff
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Dec 3, 2007
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?
Andrew
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Mar 20, 2008
Hello,
I have a question regarding the backup for the database in Simple Recovery Model.
In this Model, I know we can restore only to the last full backup or can use differential
Backup, if implemented as a part of backup.
But my point of confusion is about the backup of '.ldf' file, should those file should be backed up in the
Maintenance Plan, if yes does it help in reducing the size of Log file?
Do we need the backup of '.ldf' in phase of Restoring?
As I mention my database has Simple Recovery Model, but the size of log file is around 20GB,
Could not understand why as in this Model, normally it automatically truncate the Log file?
Help me to clear my these doubts,
thanks,
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Oct 9, 2007
Hello!
I make a full backup of many databases (about 45).
How can I recovery all databases at once? With a script?
I use SQL Server 2005.
Thanks
ezinsi
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Jul 23, 2005
My trancaction log is 25GB and my database file is 39GB. I justswitched to the 'Simple' recovery model from the 'Full' recovery model.When if ever can I expect the size of the transaction log to reduce insize? Is there anything else that I should do to aide with thereduction?Thanks,Peter
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Jun 2, 2015
Is this Possible, If database is in Simple recovery Mode and the ldf size gets increased?? .
mdf size : 159 GB (171,383,717,888 bytes)
ldf size : 6.46 GB (6,945,505,280 bytes).
My question is if the recovery model is in Simple Mode then why the log gets generated high.
dbcc sqlperf(logspace) --output
DATABASE Logsize(MB) Log space used(%) status
mam 6623.742
0.4305579
0
Is there any issue or it is Normal.
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Nov 3, 2015
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.
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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?
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Dec 21, 2007
I am amazed to see this morning that log file consuming whole disk space even though the database is in simple recovery mode.
What could be the reasons to fill in the space even in simple recovery mode??
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Sep 15, 2015
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?
Will full backup truncate log file ?
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Jun 30, 2015
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.
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Dec 21, 2006
We have a sql 2005 x64 database (datawarehouse related), essentially a work area for us, that we truncate and re-populate via BCP weekly. (We don't backup the database at all) . From the perspective of data-import speed what is the best recovery model to use: Bulk-Logged or Simple? (I have read sql 2005 BOL and don't find it partcularly clear on this point.)
Barkingdog
P.S. Anyone know of an article listing "best practices" for high-speed data import?
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Aug 21, 2015
Can the deleted records be recovered in Simple Recovery model database? Are the delete logs present there?
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Jun 15, 2015
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.
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Mar 20, 2007
I need to display the recovery mode of ALL databases on a server into a table. (Just like the sp_helpdb prcedure extended with the recoverymodel of each Database).
Can anyone give me a hint on this or provide me with a little tsql code snipplet to realize this?
Thanks alot in advance
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Apr 10, 2008
Greetings all and thanks for reading this post.
Here is my situation... I have 2 fairly large databases. Full backups are 83gb & 63gb. I am in the process of moving these database to a new data center. I've taken full backups of these databases and shipped them to the new center. I have been taking transaction log backups (larger db every 24 hrs smaller db every 15 min ... from log shipping).
I want to restore these databases in the new data center. I've gone ahead and restored the dbs in the new location.
Question final cutover.. can I just apply the transaction logs to the databases on final cut-over or do I have to restore the database backup first then apply the transaction logs?
Is there an other way to do this that I'm missing?
Thanks.
Kurt
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Sep 16, 2015
I have log shipping enabled on databases(primary and secondary) and works fine. I need to implement TDE on the database. I have experience on implementing TDE on databases which are not used for log-shipping.steps needed to setup TDE which are involved with log-shipping.
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