Nov 22, 2024 · Understanding the architecture can improve your effectiveness in managing transaction logs. The SQL Server transaction log operates logically as if the transaction log is a string of log records. Each log record is identified by a log sequence number (LSN).

Jan 31, 2019 · This article will cover SQL Server transaction log architecture including file topography, basic overview, review of LSN and MinLSN, and log truncation

Jun 8, 2021 · As a DBA, you need to understand the architecture of the transaction log, how to manage the size and growth of the log, and periodically take transaction log backups of databases that are not in simple recovery mode.

In the previous articles of this series (see TOC at bottom), we discussed the main concept of the SQL Server transaction, the internal architecture of the SQL Server Transaction Log and finally the Virtual Log File and the best practices in managing the VLFs.

Jul 24, 2017 · SQL Server uses transaction log file to capture log records that guarantee the data integrity of the database and for data recovery. Logically, SQL Server transaction log is a string of log records. Each log record is identified by a log sequence number (LSN).

Log file architecture Virtual Log Files • No fixed size • No fixed number per physical file

Feb 1, 2022 · Figure 1: The three-level structural hierarchy of the transaction log. The transaction log contains virtual log files, which contain log blocks, which store the actual log records. The transaction log is split up into sections called virtual log files, commonly just called VLFs.

Dec 18, 2014 · Every SQL database has a transaction log which maps over one or more physical files. The Database Engine divides each file into a specific number of virtual log files (VLFs) that are being used to hold the information about everything happening inside our databases. This number of VLFs is not some kind of magic but it is being chosen dynamically.

Sep 28, 2015 · The SQL Server transaction log operates logically as if the transaction log is a string of log records. Each log record is identified by a log sequence number (LSN). Each new log record is written to the logical end of the log with an LSN …

Jan 5, 2017 · SQL Server uses LSN (Log Sequential Number) in identifying the transaction. Each and every transaction that comes to the log file will associate with an LSN number. Roll forward and the rollback will be done internally using these LSN numbers only. Before committing in MDF every transaction should be written an entry in a log file is called WAL.