Transaction log is a list/history of modification executed by a database management system to guarantee ACID properties over crashes or hardware failures.

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SQL availability groups log maintenance

I have a AG with 2 nodes in a site in sync mode and 1 offsite in async mode. I'm having trouble understanding how the logspace is maintained in this scenario. For instance, I'm taking log backups ...
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Does creating / updating statistics have an impact on the transaction log?

Does creating or updating statistics, assuming on a large table, create significant (or at all) transaction log churn? I would think not as it does not change the underlying data or structure. If it ...
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Transaction log is full due to 'CHECKPOINT' for DB in simple recovery model

For one of our DB's on SQL server 2012 RTM, We could not perform almost any troubleshooting step as the error says: " Transaction log is full due to 'CHECKPOINT" This being a dev database, its ...
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Index creation leads to large transaction log growth

I have an approximately 1 billion row table. I then create an index as follows: CREATE NONCLUSTERED INDEX [IX_Index1] ON [dbo].[MyTable]( [CustomerID] ASC ) -- CustomerID is uniqueidentifier WITH ...
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TempDB Log Space and ACTIVE_TRANSACTION

Our monitoring solution (SCOM) is currently flagging that the tempdb log is running out of space. However we have auto grow set to 1GB chunks for the log and we have 25GB of space left on the drive. ...
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Virtual Log Files (VLFs) Fragmentation

I have a database with 160 VLFs. How do I determine whether the VLFs are fragmented? Further, how do I find the percentage of fragmentation? Another thing that I want to confirm: Are the following ...
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Why did my transaction log grow so much? [duplicate]

Possible Duplicate: Why Does the Transaction Log Keep Growing or Run Out of Space? About a month ago I migrated my SQL Server 2008 R2 database to a new schema. I ran scripts to migrate the ...
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230 views

Does the PCI require to protect the Credit Card Info in the transaction log?

The PCI Data Security Standard https://www.pcisecuritystandards.org/documents/pci_dss_v2.pdf forbid storing Credit Card info in the transaction log 3.2.1 For a sample of system components, examine ...
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When REBUILDing indexes on SQL Server, what bearing does tempdb & LOG disk speed have?

Say I have the a data disk that is 50x faster than the LOG and tempdb (measured by Random Write speed) disk. (Don't ask why that's something we'll be fixing if needed) I have a table that's got 19 ...
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Why can't I read my transaction log backup file using fn_dump_dblog?

I'm using this blog on sqlskills.com as a guide to practice finding the relevant LSN in a transaction log backup for point in time recovery. After backing up the transaction log, I attempt to read it ...
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Why isn't transaction log free space always reused?

After monitoring the Transaction log files for a while I noticed that some of them sometimes behave in a way I did not expect. Here are two samples for comparison. All data is based on EXEC('DBCC ...
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Online clustered index rebuild using more log space than expected

I have a table TableA ID PK BIGINT TrxID BIGINT CardBalance INT AccountBalance INT SP_SPACEUSED 'TableA' output: name rows reserved data index_size unused TableA 904054184 ...
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What is the best storing device for DB transaction log?

I'm using MySQL with InnoDB storing engine. Transactional log is placed to dedicated HDD. Still as it is HDD atopsar shows big load (>50%) to this HDD because of big amount of small IOs (about 50 ...
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Optimising a query against sys.fn_dblog

Looking for assistance improving a query. This query is used to review the last N transactions in the LDF file and then add some useful information like the user, start time, query text, etc.. Here ...
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907 views

SQL Server Troubleshooting Replication and Long-Running fn_dblog query

I am trying to get (pull) Transactional Replication working again for a subscriber. Currently, in Replication Monitor I am seeing messages in the Publisher to Distributor tab and the Distributor to ...
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SQL Server 2008 transaction log full [duplicate]

We have a large database, with a size of approx 400GB. We are using bulk insert (from upstream system) with the following parameters: `Driver=/IIS/Appl/Server/branded_odbc/lib/VMsqls24.so` ...
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604 views

Can't restore SQL Server db from full backup, log processing fails, database in 'restoring' state

I am trying to set up a database for development purposes on my PC's local SQL Server Developer Edition 12.0.2000.8. I've got a full database backup and separate transaction-log-only backup files ...
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BACKUP LOG cannot be performed because there is no current database backup

I have a SQL Server 2005 database using the full recovery model. If I execute the following commands: ALTER DATABASE test SET RECOVERY SIMPLE; ALTER DATABASE test SET RECOVERY FULL; or BACKUP LOG ...
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Difference between Full backup and Copy-only full backup

I saw in this link that full backup does not truncate the log. So what is the difference between full backup and copy-only full backup? For the log backup there is copy-only backup which prevent the ...
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What is the purpose of having a table NOT LOGGED INITIALLY

I came across this recently. When defining a table in DB2 LUW (at least 9.5 or higher), you can define it as NOT LOGGED INITIALLY. Example from the book I read: CREATE TABLE products ( productID ...
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Set simple recovery mode and shrink log files for all user created databases

I hope you can point me in the right direction. I'm not a frequent user of T-SQL, but I did some googleing, and found the script below. I corrected the script a bit. I want the script to: To select ...
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Oracle 11g see transaction or session start time

I want to know when a session or transaction started. The deadlock file doesn't give me this information. Is there some logfile that keeps these records? I've got a transaction id "TX-1234-abcd", a ...
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What are the most effective techniques to reduce SQL Server disk space use when updating all rows in a very large table?

Given a SQL Server table with a large number of rows no columns with large-value data types multiple indexes more allocated space than available for the largest possible transaction log size a ...
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How to disable ldf file or limit its size [duplicate]

Possible Duplicate: Why Does the Transaction Log Keep Growing or Run Out of Space? My .ldf file size keeps increasing. I already tried to shrink it but after that it just grows again. How ...
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How can I find databases with a large number of virtual log files?

I have several databases on a production server that are in the hundreds of gigabytes, and have many thousands of transactions running through them on a daily basis. Almost all these databases are ...
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Log file growth issues

We're consolidating data from a bunch of databases into four reporting databases each night. Because the entire dataset is imported each night we do not need to be able to restore the data to a point ...
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Disable SQL Server Log Shipping to nonexistent destination

I am administering a SQL Server 2008 instance in a dev environment. At some point before I became an administrator, someone enabled log shipping from one of the databases on this dev instance to ...
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Would SQL in a cluster failover when transaction log for database is full?

I have a Microsoft SQL Cluster with one instance. If one of the databases is full, would SQL in a cluster failover when transaction log for database is full? If it depends on the reason the ...
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How large will the Transaction Log backup be?

I encountered a production database of 12 GB with a log of 90 GB. Full and differential database backups are made with a third-party backup tool, but no one is backing up the transaction log so it got ...
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How to monitor SQL Server data and log file growth?

I'm trying to find a way to monitor data and log file size from SQL Server databases (within an SQL Server instance). I would not want to use third party tools, but simply pure SQL or PowerShell. I ...
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tempdb in sql server

Using SQL Server 2000, I am getting the following error. The log file for database 'tempdb' is full. Back up the transaction log for the database to free up some log space." How to solve it? I ...
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Transaction Log Truncation with Copy Only

I have a database backup job set to use full backup with the Copy only option on once daily. The copy only is on because from what I have read that is the only way to backup a database that is ...
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MSDB log file size

We have a SQL Server 2008 cluster with 60 databases. Full backup runs every night, log backup runs every 15 minutes. The MSDB database recovery model is set to simple (default). To be able to see ...
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How to estimate rate of Trans Log usage

We have a moderately sized database (about 500GB) that we're going to switch from Simple to Full Recovery, with Trans Log backups every 15 minutes. Before we make the switch, I want to get an estimate ...
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Tempdb change settings and recommendation

In my production database I have below configuration in TempDb and needless to say I am facing a lot of IO issues on the drive . So, as per recommendation I am planning to change it Change #1 ...
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Large Transaction Backup

On my SQL database I run a full backup at 6am and transactional backups every 15 minutes on week days starting at 8am. Every Monday the first transactional backup is 7 Gb. I want to know why, my ...
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How to find what frequent and/or large transaction have taken place in MS SQL Server?

Each day is experiencing about 1GB sum total of all the transaction log backups that day, while at the end of that week the Full DB backup is about 180MB. For a business database for buying/selling ...
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What is the differnent between transaction log and redo log in MySQL

I have read about MySQL. In my opinion, I see two log type is very similar. MySQL save how and when data is changed in log. Information is used for recovery of MySQL. I am confusing the function of ...
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694 views

Differential/T-Log LSN question

So, this is now my third question on this topic. I just keep finding more and more than i want to know and understand about how FULL recovery works. We transitioned a database to FULL yesterday by ...
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369 views

Can I decrypt TDE transaction log files for use with 3rd party software?

Is there a way to decrypt TDE log files on disk for use with 3rd party software? I have the original key and certificates. I am trying to use the transaction files with a 3rd party tool in order to ...
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IO request time and less write latency

I am facing issues related to constantly growing log file due to which I am getting error. When I checked SQL Log I found below messages (error log is filled of these messages almost 90%) SQL ...
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Tail Log backup when doing a restore?

Typically when doing a restore of a DB from a production server to a non-production server I will use the WITH REPLACE option as when I forget I get an error about the tail log not being backed up. ...
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SQL Server 2012 mirror setup - how to reduce transaction log files [duplicate]

We just upgraded our Windows Server 2003\SQL Server 2005 setup to Windows Server 2012/SQL Server 2012. Both configurations have a mirror with NO witness server. On the old setup the transaction logs ...
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535 views

Issue shrinking dev sql server DB's log file [duplicate]

I have a development db that's running on sql 2014 in 2012 compatibility that I'm having an issue with trying to shrink the log file. The mdf is 60+gb and the log is 80+gb but since it's dev like ...
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Does it make sense to use full recovery if the data and log files are on the same HD?

We have a database that was set up to use full recovery and my guess is that the reasoning was only to prevent data loss if a failure happened between full backups. We make daily full backups of the ...
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Shrink a large log file for a “Throw Away” database

I have a copy of my prod database on a development server. I am using it to test a deployment script. But when I run it, it says that the log file is full. I checked and it is at 10 GB (Almost the ...
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What is the undo pass that SQL Server does during a RESTORE WITH STANDBY operation?

It's my understanding that SQL Server generates undo files when applying a restore to a database using the RESTORE WITH STANDBY. From the MSDN documentation (Emphasis mine): The standby file is ...
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SQL Server 2008 Query Saved in Logs?

Every time I create a query and run it to create a report I save the query in my Projects folder in case I have to rerun the query in the future or if I have to modify it for any reason but it seems ...
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Question about logging architecture

I understand that when (for example) an update is issued, the data pages are first read into the buffer pool, locks are acquired and changes are written out to the log file in the buffer, then the log ...
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Shrinking a SQL Server Log File Multiple Times

Recently ran into a situation where after a log backup and shrinkfile, the LDF file remained the same size. DBCC LOGINFO clearly showed only one active VLF and SSMS said that 99% of the space in the ...