I want to ask what are the impacts if I limit the file size to certain MBs and will it report (File is full) or overwrite old data when the file reachs the assigned size?
you have to configure an alert (several MB) before log gets full.
when the log gets full no change in the database shall be committed.
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but is it true that SQL Server will be faster if the allocated size for the log file was larger?
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Jassim,
Perhaps you are referring to an auto grow capability of data and log files. By default database files are created with auto grow option. Each time a file reaches it's full capacity it gets resized, by the specified amount (either fixed size or percentage). This operation has some negative impact on the database performance, so in general it should be avoided. The autogrow functionality is primarly useful in systems that are not closely monitored by an adminstrator, for example embedded applications.
So if you set the initial log size to be bigger, you avoid growing the log file on demand. You can monitor for the auto grow of log and data files using SQL Profiler by selecting Log File Auto Grow and Data File Auto Grow events.
Hope that helps.
Regards,
