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No values are required for lookup purposes. And the length of the keys makes surprisingly little difference to the size of the hash.

For example: For a hash with 11,881,376 keys:

  • From 5-bytes keys (the minimum required) to 14-bytes keys, the memory required remains almost static at 1.7GB.
  • From 15-bytes through 29-bytes, it goes to 1.9 GB.
  • From 30-bytes through 46-bytes, it goes to 2.1 GB.
  • from 47-bytes .... , it goes to 2.3 GB.

So if I have 11,881,376 keys with an average key size of say 250 bytes it would only be 2.3 GB? Same with 400 bytes? Or 500 bytes?

Jason L. Froebe

Blog, Tech Blog


In reply to Re^4: PSQL and many queries by jfroebe
in thread PSQL and many queries by citycrew

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