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    <p>I think you are overestimating the memory system requirements given the process you have described. Adding a row of data every second (or 11 per second) is not a hog of resources. In fact it is likely more time consuming to UPDATE vs ADD a new row. Also, if you add a TIMESTAMP to your table, sort operations are lightning fast. Just add some garbage collection handling as a CRON job (deletion of old data) once a day or so and you are golden.</p> <p>However to answer your questions:</p> <blockquote> <p>Is it posible to do the insertion/updating part directly in the database server or do I >have to do the logic in the php script?</p> </blockquote> <p>Writing logic from with the Database engine is usually not very straight forward. To keep it simple stick with the logic in the php script. UPDATE (or) INSERT INTO table SET var1='assignment1', var2='assignment2' (WHERE id = 'checkedID')</p> <blockquote> <p>Is there a better (more efficient) way to store the information without a decrease in >performance in the display device?</p> </blockquote> <p>It's hard to answer because you haven't described the display device connectivity. There are more efficient ways to do the process however none that have locking mechanisms required for such frequent updating.</p> <blockquote> <p>Regarding the report generation, if I want to sample intervals lets say starting from >yesterday at 15:50:00 and ending today at 12:45:00 it cannot be done with my current data >structure, so what do I need to consider in order to make a data structure which would >allow me to create such queries.</p> </blockquote> <p>You could use the a TIMESTAMP variable type. This would include DATE and TIME of the UPDATE operation. Then it's just a simple WHERE clause using DATE functions within the database query.</p>
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    1. POInsert a row every given time else update previous row (Postgresql, PHP)
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    1. COWhen the application starts it will get a list of devices, then it then starts a timer and based on the list will call a partucular method for each device, when finished reading the information, will start the process again.
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    2. COIs the application simply a local (For your eyes only) or multiple users style?
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    3. COIt is both local and shared.
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