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MDF and LDF files.

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Hi.

I have a large number of databases on my MS SQL server.

There are files .MDF and .LDF files. From what I can tell (and I may well be VERY wrong here), the MDF file is the REAL data. The LDF file are changes yet to be merged into the live data.

The databases are either for testing (i.e. product development) or from customers for us to determine product faults. (i.e. I can play with this).

1 - What are the LDF files?
2 - Why are they so big?
3 - When do "transactions" become part of the "data"?
4 - If the data was merged more often (or as soon as the update was made), would the application perform faster?

If it makes any difference, we are using Delphi with ODBC Express and using the MS SQL ODBC driver for communication.

We tried limiting the size of the log file (within Enterprise Manager). The application then complained saying the log file is full and the update failed.

Thanks in advance.

Richard Quadling.


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