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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Behavior of Oracle During Very Large Transactions

I understand that if a transaction is large enough to overflow all of the redo logs on an Oracle database, and the database is in ARCHIVELOG mode, the transaction will wait until the archive log file ...
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26 views

DB2 Transaction Logs - can they be COPY-PASTE on another Disaster Recovery Server?

We have Server1 with Online Backup1, Archive Logs 1,2,3 for example and Transaction Logs from 1 to 10. We are interested in next scenario: If Server1 fails completely and we want to move everything ...
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34 views

Partitioning large table requires lots of extra disk space: does switching recovery model help?

We are in the process of implementing partitioning on a SQL Server 2012 database. It worked fine in our environment, but in the client environment we ran out of disk space. The entire database was ...
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62 views

SQL Server differential backup LSN values

I'm looking at restoring databases on SQL Server and I'm not understanding something related to the LSNs. Here is a screenshot from the Restore Database dialog in Management Studio for a sample ...
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47 views

DB2 ARCHIVE mode - Can all archive logs be deleted after doing the FULL OFFLINE backup?

I am interested in one thing, if I understood correctly. DB2 is in Archive mode (online backups are made and archive logs keep coming which is OK). If I made offline full backup today and I know I ...
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55 views

Shrink log file after configuring backups properly

I had a database that was working in FULL recovery mode but never had transaction log backups done. The consequence of that was the fact that the log file kept growing and now its 10 GB in size. I ...
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14 views

tempdb Log Continuing to Fill, but No Long Running Transactions In Flight [duplicate]

I'm suspecting a report is generating a large data set with sorting in tempdb, causing the tempdb tlog to fill. I'm trying to identify the session that's generating the log growth but DBCC OPENTRAN is ...
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36 views

Why does shrinking the transaction log generate lots of log (LOP_SHRINK_NOOP) and not shrink the log?

I just tried shrinking an overly big log file (FULL recovery model). This operation is not expected to always succeed and indeed the log was not shrunk. But I observed that a lot of new log was ...
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57 views

DB2 big strange problem - database is returned to CIRCULAR mode but archive logs keep coming to old archive location

my DB2 database (v 9.7) is in Circular mode. Current Logging Type:Circular (USEREXIT) = OFF (LOGRETAIN) = OFF (LOGARCHMETH1) = OFF (LOGARCHMETH2) = OFF (LOGPRIMARY) = 10 (LOGSECOND) = 10 Path to log ...
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How should I (re) index the table while keeping the transaction log small?

I have a 170 GB table in a database. It has 70% fragmentation on its index (index has multiple columns in it). The last time I tried DBCC REINDEX the transaction log blew up in the hundreds of GBs. ...
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SQL Server transaction log reported full when it isn't [duplicate]

The transaction log for database 'WebDB' is full. No, it isn't. Its 90% free. The transaction log backups run normally. My hardware guy tells me the hardware is running perfectly, with plenty of ...
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28 views

Tran Log file growing even after log backups and Log shipping configured

I have log shipping configured for a database in sql server 2005 with below details: A) Database X hosted on primary: Log backup every 1 hour as scheduled in LS Backup job: Data file: 40 GB and Log ...
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165 views

Index rebuild log growth

How much log index rebuild will generate.I remebered reading rebuild index should generate same amount of log file as table size.But my tests are showing otherwise.We need this estimate since we are ...
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2answers
224 views

When is it safe to disable InnoDB doublewrite buffering?

MySQL InnoDB allows us to disable doublewrite buffering by setting innodb_doublewrite = 0. Other databases doesn't seem to allow this setting to be tweaked. How could InnoDB still be able to maintain ...
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38 views

The purpose of transaction log in Restore First

Based on this article , the golden role for restore first After restoring full database backup, restore latest differential database backup and all the transaction log backup after that to get ...
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78 views

I do not understand SQL Server Transaction Logs

I understand that a Microsoft SQL Server Database has two components: A database file A transaction log file Whenever I make a change to a table, does it get written to both the database file AND ...
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47 views

Log Sequence Numbers in Full BackUp and Log Backup

My full back-up starts daily at 02:00 AM. It takes about 3 hours. I also take T-Log back-ups every 15 minutes (at 15,30,45 and 00 hours). I can verify the LSN sequences of T-log backups when I ...
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2answers
78 views

Deleting rows from a table with a very small amount of expansion space

I have multiple tables that I have backed up the data in, and now am deleting the old data for the time, archiving is not an option due to space constraints at this time. I have tried running the ...
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25 views

Removing Components from a backup

Ok, I will start this off by: Yes, I know I should have paid more attention. That being said, I was trying to create a full backup of my DB prior to doing truncation on a number of the tables. When ...
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24 views

Controlling SQL Backups From Two Machines

I'm far from a DBA, and don't really have a great understanding of backup chains, but I was asked the following question by a network administrator, and wanted to be sure that my answer was correct. ...
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66 views

Breaking up large transaction - worth it?

I'm in charge of monitoring the performance of an industrial chemistry process. Every hour, a process gathers 50 million rows from various subsystems and feed into the central database. The whole ...
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334 views

Transaction Log won't shrink, DB thinks it is replicating

I've got a SQL Server 2008 R2 Express database running Kaspersky Security Center, and I have no idea under what circumstances the install happened, but the database appears to think that it's being ...
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113 views

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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1answer
150 views

Checkpoints and Logging

I'm working on getting full grasp of logging architecture. Please correct me if I'm wrong here: I understand that a checkpoint occurs (also lazywriter) to write the dirty pages in the memory to the ...
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43 views

Sqlserver: Get Meta-Info about TRN file

Is there any way to get the timespan of the data contained in a TRN-File? What I have: A backup of a transaction-log What I need: The timestamp of the first and the last entry inside the log ...
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61 views

Availability Groups, Log File Backups and Recovering the Secondary

I am currently working on ironing out some kinks in a testing setup for our large (1.5TB+) database in an Availability group and have a few things I need some help with. Setup I have a two node ...
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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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101 views

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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148 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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166 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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66 views

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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84 views

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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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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440 views

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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220 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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35 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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1answer
2k views

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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93 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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527 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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86 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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1answer
67 views

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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239 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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73 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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244 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 ...
2
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1answer
51 views

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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1answer
83 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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Too much IO to MySQL InnoDB log files

I am using MySQL version: 5.5.38 I have dedicated HDD to InnoDB log files using innodb-log-group-home-dir option. atopsar -d 30 shows big load (>50%) to this HDD The thing is that I have only 75 ...
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231 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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165 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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261 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 ...