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
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