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How can I estimate the database storage requirements for WinSPC? 
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To estimate the database storage requirements for your WinSPC database:
 Multiply your average subgroup size by 51. (E.g. 5x51=255)
 Multiply your average percentage of subgroups in violation by 66. (E.g. 2%x66=1.32)
 Multiply your average number of tag values per subgroup by 17.4. (E.g. 4x17.4=69.6)
 Add the results from the above three steps together. (E.g. 255+1.32+69.6=325.92)
 Add 181.88 to the sum from step 4. (E.g. 181.88+325.92=507.80)
 Multiply the sum from step 5 by the average number of subgroups you collect per day. (E.g. 507.80x10,000=5,078,000)
 Divide the product from step 6 by 1,000,000. (E.g. 5,078,000/1,000,000=5.078.)
The answer you get from step 7 is the MB of disk space you can expect to be consumed per day of WinSPC operation.

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