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    2 million records * 500 bytes = 1 GB of data. That's a lot of data to search, whichever way you go about it - is each value of X likely to be unique, or will you have many records with the same value of X? Commented Nov 9, 2011 at 14:14
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    That would also be a lot of data to attempt to store in memory as a cache for quick retrieval. That would equate to more than 1GB per user session. Commented Nov 9, 2011 at 14:18
  • My previous comment assumes a web application. Is this a web application? Commented Nov 9, 2011 at 14:19
  • It is a desktop application. Values in the records are not necessarily unique. Also, I am searching for substring not for an exact match. Commented Nov 9, 2011 at 14:33
  • @maple_shaft: I would only cache the records that I have accessed recently. If I change the query string and a record still matches, it is still in the cache. Commented Nov 9, 2011 at 14:34