![]() ![]() This might be fine for small transaction logs, but when the transaction logs become quite large, autogrowth based on a percentage might allocate way more space than the transaction log will ever need. It doesn’t scale well because more space is allocated with each successive autogrow operation as the transaction log gets bigger. Growing in percentages does not scale well as the transaction log grows larger. When the transaction log is set to grow based on percentages, the amount of space added increases with each autogrowth. For example, if the transaction log is currently 100 GB in size and specified to grow by 15%, then 15 GB will be added to the transaction log when it runs out of space and grows. When the transaction log is set up to grow based on a percentage, the amount it grows is calculated based on the percentage value of the current size of the transaction log. There are two different settings for how the transaction log will autogrow: by percentage or by megabytes. When the transaction log is set up to autogrow, it will grow automatically when the transaction log becomes full. Alternatively, you can set up the transaction log to autogrow. When a transaction fills up the transaction log the transaction will fail with a 9002 error msg. A transaction log that has a fixed size will not grow when it runs out of space. The transaction log size can be fixed or can be set up to autogrow. Whereas, the max file size sets the upper limit on how big the transaction log can get. The file growth setting identifies how much additional space will be added to the transaction log each time it grows. There are two settings associated with the growth of the transaction log: file growth and max file size. Therefore, it is best to create a transaction log as big as you think it needs to be, set it up to autogrow, and then monitor it over time to see how much space it uses and how often it grows. When it is too small, it will need to be expanded, and when it is too large, it wastes valuable disk space. Most of the time, the transaction log for a new database will be too small or too big. Ideally, you should size your transaction log so it will never need to grow, but in the real world, it is hard to predict how big a transaction log needs to be. This article covers transaction log growth, how the log grows over time, and managing SQL Server transaction log size. ![]() In reality, transaction logs grow, mainly for new databases, but sometimes even the log files of mature databases can grow. Ideally, a transaction log should never need to grow because it is sized based on the database processing requirements. The size of a transaction log is impacted by the frequency of updates to a database, the recovery model, the frequency of checkpoints, and how often transaction log backups are run. The transaction log is a file that contains all the data modifications that are made. ![]()
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