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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Find out who ran a query using transaction log backups

We have a SQL Server 2012 Enterprise database running in Full Recovery Model with transaction log backups running every minute. A query was run last night which means we need to recover data from a ...
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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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660 views

Is there a way to minimally log insert under Always on?

I have a primary database in FULL recovery mode which is part of Always On group. Is there a way to minimally log insert operation under FULL recovery model? I have a process that is executed each ...
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How to deal with very large transaction logs in SQL Server [duplicate]

Here is my situation: I have being asked to deal with a SQL Server 2008 R2 database that has a transaction log that is several times bigger than the database itself. The database is in full recovery ...
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476 views

A transaction log grows unexpectedly [duplicate]

I am trying to understand what process is making my transaction log file to grow. For example, currently it is 120 GB and only 5-10 MB of it are in use. Before: FULL recovery mode a backup of the ...
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what are the events recorded in the transaction log?

in regards to what events are recorded in the transaction log , is the below an accurate/comprehensive list? How are things recorded? are the pages that are marked as modified written to the ...
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Is it good idea to repair sql file?

We are having an ETL process which inserts lots of data into tables. This database is set to Simple Recovery Model and the transaction log is growing a lot. I was thinking that would it help to set ...
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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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104 views

Database is happily available even during log growth?

I’ve been creating a process to go through all our databases and analyze the log structure, backup, shrink, and resize appropriately taking operational requirements and VLF sizing/amount into account. ...
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Does a database backup reduce size/increase free space of the log file? [duplicate]

Novice question, sorry! Got a SQL Server database and the log file is massive and keeps growing every day. I've archived data from the database and then done a full backup. I was expecting the log ...
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Transaction Log maintenance on Mirror database

SQL Server Version: 2008 R2 Enterprise SP2 I am trying to get a handle on our SQL Server maintenance and I came across something I think is incorrect. We have a single production instance with 3 ...
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Simple model database transaction log full 'CHECKPOINT'

I have a SQL Server 2012 SP1 database which has a problem that the transaction log is full. It consists of a single data file and a single log file, both about 800MB. I had 5GB free disk space, and ...
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567 views

Cannot shrink transaction log

Bit of a headscratcher here. I have a db that has less than 1GB of data, but a 40GB log file. Transaction logs are backed up daily, and there is not a lot of activity on this database; approximately ...
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516 views

Restore Verify Only w/ Transaction Log Backups

Question When RESTORE VERIFY ONLY on a transaction log backup fails, what do you do? Background After FULL and DIFFERENTIAL backups, I run RESTORE VERIFY ONLY on the backup file(s). This rarely ever ...
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397 views

Transaction Log is big! But simple recovery mode is chosen!

I am wondering: We have a Database on our MS SQL Server 2012. The recovery mode is "simple". The DB itself is about 2.7GB big. I have an MAX Size for Trn-Log configured (3GB). Now i made a ...
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43 views

Viewing how much transaction log is used in Simple Recovery Model

We have a DW database in Simple Recovery Model. Every night, we load in data from different sources and run a few procs. I'd like to see how much the transaction log is actually used during this ...
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173 views

Upgrading 8.1 to 9.3 - using statement log and WAL to check compatibility?

We're migrating from postgres 8.1 to 9.3, since we need streaming replication badly. All the application developers have deserted the company a long time ago, way before my time here, so there is ...
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2k views

Shut Down MySQL during InnoDB rollback after crash

I am puzzled once again. We had a server crash last night during some huge queries. Upon restart in the morning MySQL went into recovery mode. I needed to shut down the MySQL service and it is ...
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146 views

VLF, Shrink and Simple Recovery

We currently have a transaction log thats been growing incrementally and has too many VLF files. I am going to follow a process of shrinking and then re-growing the log file to a suitable size to ...
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246 views

Mysqldump --flush-logs results in small backup files?

New to MySQL and just learning how to setup a daily full backup (binary logs enabled). My goal is to run a daily full backup of the databases/schemas and reset the binary log. I'm currently using an ...
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2k views

SQL Server 2008 R2 Log File Location

One of the databases I am going to support does not have a validate log file location. The drive which the log file is pointing to does not exist. But I don't see any error in database error log ...
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137 views

Alternatives to log shipping / Replicate a local SQL Server database on a remote DB accesible only by IP

I'm trying to replicate a local SQL Server 2008R2 DB to a remote DB instance accessible only by IP (specifically, a RackSpace cloud site DB). I believe log shipping is ideal, since the remote only ...
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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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427 views

What is causing my Transaction log to grow

The TLOG in my SQL Server 2008 is growing faster than usual. The DB has a Full recovery model and we have a TLOG backup every hour. Can you please write me or refer me to link that describes a way to ...
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Is tlog backup on replica clearing VLFs on the primary?

Is it true that a transaction log backup made on the secondary database is clearing the inactive VLFs on the tlog file on the primary database (in case of Availability Groups)? I was not able to find ...
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266 views

MySQL InnoDB log files on different location

I am using MySQL version: 5.5.38 There are following parameters that can control InnoDB log files: innodb_log_files_in_group - amount of log files in the group, by default 2. Will create 2 files ...
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532 views

How to find the active transactions in VLF?

Is there a way to find the T-SQL statement that is part of the active transaction that is blocking the reuse of the transaction log file VLFs? I am performing tlog backups on every 15 minutes, but ...
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655 views

Transaction Log Shipping Removal, Backup and Drop Database

I have databases (about 15 different) Production Databases set for Log_Shipping and I would like to take a full backup of it and need to drop from production later on because we have already move it ...
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926 views

Log full and an Active_transaction on database

I have limited access to this server eg I cannot SELECT * FROM sys.dm_tran_session_transactions for example I, perhaps foolishly, ran this query to insert some test data... begin transaction update ...
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402 views

SQL Server 2005 Log Truncate - how long for a 60Gb log; mins, hours or days? [closed]

I have taken over an old website. To cut a long story short the people that host the computer, backup all the database files, but there is no maintenance plan in place for the backup (e.g. they ...
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336 views

Transaction Log Backups

I am working on backup+recovery scenario and I came across a situation where I could not figure out how I would have to deal with it. We have couple databases where sometimes there may not be any ...
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250 views

Log Shipping Alert

I have 3 databases which I have took them offline and I have Log Shipping setup on them and I wanted to stop alerts for those databases. How can I do that? Thank You for help
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495 views

Log File Size near 100% - How to find Active Transaction [duplicate]

The transaction log file size is nearing 100% on one database. I run the below and both return 0 so no active transaction running. The last query tells me that the database is in SIMPLE mode, but ...
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Avamar SQL Agent running against live SQL Server databases

We use a large company as our service provider. The tech people from that service company are pushing very hard to install something called the Avamar SQL Agent which purportedly will be used to ...
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356 views

Fix transaction log file after database update

I have a databases that are regularly (monthly) updated. An update includes a lot of new or changed T-SQP procedures, functions, indexes creation, etc. A database X has transaction log file with the ...
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337 views

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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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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ORA-00338: log # of thread # is more recent than control file

We are facing the following error on our production database: ORA-00338: log # of thread # is more recent than control file The database crashed and there was no recovery action. What could I ...
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Shrink Transaction Log While Using AlwaysOn Availability Group

We are using AlwaysOn Availability Group feature of SQL Server 2012. Regular full database backups and transaction log backups are done every day on the secondary database. I have read here doing the ...
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135 views

Maintenance Plan Transaction Log Backup

I have a backup device set for my transaction log so the sets are contained in 1 file. I have this set to append, is this correct or should it be overwrite in the plan? After the full backup is taken ...
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Transaction log full due to log_backup

I am testing how certain operations are logged under different recovery models.Below are steps i have did till now 1.create database in full recovery model 2.take backup 3.create a table and insert ...
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Fixing an error 9004 without taking the database offline

My database (SQL Server 2008 r2) is running fine but I’m getting the following error in my event log. Error: 9004, Severity: 23, State: 6. An error occurred while processing the log for database ...
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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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SQL Server - contents of transaction log file in more detail

I have a question regarding transaction log (let’s just call it LDF for short) contents. I am assuming a database with full recovery model. I have read that LDF file contains (logs) each and every ...
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Why Does the Transaction Log Keep Growing or Run Out of Space?

This one seems to be a common question in most forums and all over the web, it is asked here in many formats that typically sound like this: In SQL Server - What are some reasons the ...
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497 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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195 views

Open Transaction that won't go away SPID Ns

There is a transaction that has been open on this instance since it was restarted and is preventing us from clearing the ldf. Here is the transaction information: Transaction information for ...
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149 views

Log File Management - Space on Disk

At our organisation we have several non-Production environments where Developers run free and wild with TSQL code and databases. The DBA team do not normally monitor or maintain them. Recently several ...
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Switching from SIMPLE to FULL recovery mode implications

I have several databases that I'd like to move over to FULL recovery mode so we can have point-in-time restore capability. We don't need it on all of our databases, just the ones that are transaction ...
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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 ...