Performance Issue in when pulling record from Table crmd_orderadm_i

Hi Frds,

I am facing huge performance issue almost 15 min to execute single query. There is huge data in table almost 25 million record in  crmd_orderadm_i table.

First I am getting item GUID from the last 2 month service contract.

Second query i wrote where am trying to pull all record matching parents = item_guid, this taking hell out of timing.

Please suggest is there any fastest way to get item guid of match parent = previous item guid.

Thanks,

Raj