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The QuickBooks transaction log file is a log of all the changes that are about to be made to the company file (.qbw) before they are actually recorded in the company file.  It is stored in the same folder as the company file itself.  It is automatically created by QuickBooks.

The filename of the transaction log file is in the form:  company file name].qbw.TLG

QuickBooks uses data written to the transaction log file to transparently complete the recording of transactions that were not completely recorded in the company file itself because a connection to the company file was lost.  The transaction log file can also be used in conjunction with a QuickBooks backup file (.qbb) to recover from a damaged company file.

The transaction log file is reset when:

• You sucessfully complete a manual (not a scheduled or online) backup in QuickBooks.
• You restore a portable company file (.qbm).
• The company file does not match the transaction log file.

Because the transaction log file is only reset under specific circumstances, it may grow in size and become larger than the QuickBooks company file itself.  Large transaction log files can have an adverse effect on overall QuickBooks performance, so it’s important that we will have to take care of it and we can remove the .TLG files on user’s request.