Hi Sajith,
recent MySQL cluster versions don't have this limitation (for non-index columns AFAIK) any more, you can store this data on the disk. There are some people that run openser with mysql cluster on this list, it was also discussed a few times in the past here.
I think there is a penality about 10x when using disk-storage instead of memory-storage for ndb, mainly for write queries, so be carefull in your config file about the number of queries you make to the DB...
I can't comment on drdb and on postgres clustering, but in openser is mysql the main target too. I did recently some work in this area, trying to even the differences between the database connectors. But mysql is IMHO still the most stable option, as it gets the most testing from the users.
Cheers,
Henning
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