Re: PostgreSQL Performance issue

[Thom Brown <thombrown@xxxxxxxxx>]

On 27 April 2010 09:11, <A.Bhattacharya@xxxxxxxxxxx> wrote:

Dear All Experts,

 

I am using in PostgreSQL 8.3.5 database on windows 64 bit OS.

However, I have a batch program written in Java which processes the data and populates them into tables in Postgres database.

 

I have 622,000 number of records but it is taking almost 4 and half hours to load these data into the tables.

I have a simple function in db which is being called from Java batch program to populate the records into tables from flat files.

 

I have the below system configuration for my database server.

Database Server	PostgreSQL v8.3.5
Operating System	Windows 2003 Server 64 bit, Service Pack 2
CPU	2 * Quad Core AMD Opteron Processor 2376 @ 2.29 GHz
Memory	16 GB RAM
Disk Space	total 2.5 TB [C drive – 454 GB & D drive 1.99 TB]

 

 and I have set my postgresql.conf parameters as below.

 

======================================================================

#------------------------------------------------------------------------------

# RESOURCE USAGE (except WAL)

#------------------------------------------------------------------------------

 

# - Memory -

 

shared_buffers = 1GB                                                                                                     

temp_buffers = 256MB                                   

max_prepared_transactions = 100              

                                                                               

work_mem = 512MB                                                        

maintenance_work_mem = 512MB                             

                                               

 

# - Free Space Map -

 

max_fsm_pages = 1600000                          

                                                                               

max_fsm_relations = 10000                                                                                           ‘

 

#------------------------------------------------------------------------------

# WRITE AHEAD LOG

#------------------------------------------------------------------------------

wal_buffers = 5MB                                            # min 32kB

 

checkpoint_segments = 32

checkpoint_completion_target = 0.9

 

#------------------------------------------------------------------------------

# QUERY TUNING

#------------------------------------------------------------------------------

 

# - Planner Method Configuration -

 

enable_hashagg = on

enable_hashjoin = on

enable_indexscan = on

enable_mergejoin = on

enable_nestloop = on

enable_seqscan = on

enable_sort = on

 

effective_cache_size = 8GB

 

========================================================================

 

Please advise me the best or optimum way setting these parameters to achieve better performance.

Also note that, when I am setting my shared_buffer = 2GB or high , Postgres is throwing an error “shared_buffer size cannot be more than size_t”

 

It would be very grateful, if anyone can help me on this.

 

Many thanks

Are these all being sent in 1 transaction?  Can't you use COPY to bulk insert into the database?  If not, can you insert in batches (like 1,000 at a time) Have you got any triggers/constraints/complicated domains on the table you're inserting into?

Thom