Technical Overview, best expect table

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The best_expect table is an on-disk index used to speed the result display of keyword searching. It records the lowest (and therefore best) expect score and identification count for each protein accession number in GPMDB.

The contents of this table are updated incrementally as part of the update procedure which executes daily.


  • label: the accession number of the protein.
  • expect: the base-10 logarithm of the chance that the identification of this protein was an accidental random match. E.g., if the expect value is -4.0, the odds of this protein identification being a random match are 1 in 10,000. In this table, these values are going to be quite small.
  • count: the number of successful identifications of this particular protein.
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