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When does SQL Server flush the transaction log?
During the execution of the queries, SQL Server flushes the log buffer into the transaction log files. This value is 20 in the lowest place as we observe. This working principle is called Full transaction durability and it synchronously writes the transaction into the transaction log files after the commit statement.
How many log buffer flushes are there in SQL?
This code executes 1,000,000 small transactions that change data in a user database. This work will trigger at least 1,000,000 log buffer flushes. You could get a few additional ones due to the log buffer filling up. You can use the following test template to count the number of log buffer flushes and measure the time it took the work to complete:
Why is the log buffer flushed into the disk?
The log buffer is flushed into the disk in certain conditions. After all these explanations, the databases which involve a huge amount of small transaction workload may experience write latency issue which is related to the log file. In the next sections, we will learn how to solve this problem.
How to improve transaction log performance in SQL Server?
In this article, we will learn the Delayed Durability feature that helps to improve transaction log file write throughput in SQL Server. OLTP (Online Transaction Processing) databases should process a huge number of transactions within the shortest time and concurrently.
How does the FILESTREAM feature work in SQL Server?
The SQL Server FILESTREAM feature allow you to store varbinary (max) binary large object data as files in the file system. When you have a large number of rows in FILESTREAM containers, which are the underlying storage for both FILESTREAM columns and FileTables, you can end up with a file system volume that contains large number of files.
How to back up SQL Server transaction log?
Back up the log 1 Freeing disk space. You might be able to free disk space on the disk drive that contains the transaction log file for the database by deleting or moving other files. 2 Move the log file to a different disk. 3 Increase log file size. 4 Add a log file on a different disk.