Hi All, I have recently moved postgres from one server to another (a newer server) and have encounter a problem I cant figure out. I have a table (roughly 7.5GB) that gets re-created every night with fresh data, to insert the data I run the following procedure.
Drop all indexes Truncate Table Insert Data Create Indexes The problem I have is that it takes around 15 mins to insert the data into the table which is a massive improvement from the old server but it then takes 40 mins to create two indexes one 1GB index and another that is a 2GB index this is considerably slower than on the older server. I have had a play around with some of the settings but with no real success, in particular the maintenance_work_mem setting. Any help on this would be greatly appreciated. The new server is a Virtual Server running RedHat Linux, Postgres 8.3 , 8GB of RAM with 4 x 2.66ghz. The current settings in postgresql.conf I have are shared_buffers = 768MB temp_buffers = 100MB #max_prepared_transactions = 5 work_mem = 64MB maintenance_work_mem = 800MB #max_stack_depth = 2MB # - Free Space Map - max_fsm_pages = 2097152 #max_fsm_relations = 1000 # - Kernel Resource Usage - #max_files_per_process = 1000 #shared_preload_libraries = '' # - Cost-Based Vacuum Delay - #vacuum_cost_delay = 0 #vacuum_cost_page_hit = 1 #vacuum_cost_page_miss = 10 #vacuum_cost_page_dirty = 20 #vacuum_cost_limit = 200 # - Background Writer - #bgwriter_delay = 200ms #bgwriter_lru_maxpages = 100 #bgwriter_lru_multiplier = 2.0 /etc/sysctl.conf kernel.shmmax = 4294967295 kernel.shmall = 268435456 Any help would be greatly appreciated, thanks in advance Fran ___________________________________________________ This email is intended for the named recipient. The information contained in it is confidential. You should not copy it for any purposes, nor disclose its contents to any other party. If you received this email in error, please notify the sender immediately via email, and delete it from your computer. Any views or opinions presented are solely those of the author and do not necessarily represent those of the company. Cromwell Tools Limited, PO Box 14, 65 Chartwell Drive Wigston, Leicester LE18 1AT. Tel 0116 2888000 Registered in England and Wales, Reg No 00986161 VAT GB 115 5713 87 900 __________________________________________________
