Hi, I have a postgres(v9.5) table named customer holding 1 billion rows. It is not partitioned but it has an index against the primary key (integer). I need to keep a very few records (say, about 10k rows) and remove everything else.
insert into customer_backup select * from customer where customer_id in (<id1>,<id2>,..); If I go for something like above I'm afraid the insert-select may take a very long time as when I ran select count(*) from customer; it is taking about 45 minutes to return the count. Are there ways to improve the efficiency of the insert-select by , say, tuning some configurations related to memory to improve the efficiency ? This is a box with 96GB of RAM overall and I can stop all the data load and DML operations if needed. But need a way to run this query as much efficiently as possible Thanks and Regards, Karthik Disclaimer: This communication (including any attachments) is intended for the use of the intended recipient(s) only and may contain information that is considered confidential, proprietary, sensitive and/or otherwise legally protected. Any unauthorized use or dissemination of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender by return e-mail message and delete all copies of the original communication. Thank you for your cooperation.
