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Inside Microsoft® SQL Server™ 2005, Fourth Edition by Kalen Delaney

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Changes in Log Size

No matter how many physical files have been defined for the transaction log, SQL Server always treats the log as one contiguous stream. For example, when the DBCC SHRINKDATABASE command (discussed in Chapter 4) determines how much the log can be shrunk, it does not consider the log files separately but instead determines the shrinkable size based on the entire log.

Virtual Log Files

The transaction log for any database is managed as a set of virtual log files (VLFs) whose size is determined internally by SQL Server based on the total size of all the log files and the growth increment used when enlarging the log. When a log file is first created, it always has between 4 and 16 VLFs. A log always grows in units of entire VLFs and ...

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