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IDS Forum

Re: Slow Bulk Loading problem

Posted By: Art Kagel
Date: Wednesday, 14 October 2015, at 7:53 a.m.

In Response To: Re: Slow Bulk Loading problem (CHALLENGER212 ABDERRAFI)

OK, see my responses in-line below:

Art

Art S. Kagel, President and Principal Consultant
ASK Database Management
www.askdbmgt.com

Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions
and do not reflect on the IIUG, nor any other organization with which I am
associated either explicitly, implicitly, or by inference. Neither do
those opinions reflect those of other individuals affiliated with any
entity with which I am affiliated nor those of the entities themselves.

On Wed, Oct 14, 2015 at 7:29 AM, CHALLENGER212 ABDERRAFI <
abderrafi212@gmail.com> wrote:

> I'm usiing INSERT INTO ... SELECT FROM to load data on the raw table also I
> have one processes in wich I'm using Load from insert into to load other
> datas
> on this table, so I have 2 loads in process on ewith external table and an
> other with load from
>

So only two loads. You are loading "other data" in one session and copying
from one external table at a time? Or is it a single external table
defined with many files? If the latter, one thing you can try is having
one external table for each input file and load from the many external
tables in parallel using separate multiple sessions.

> CPU VPs??? I did not understand
>

The server instance. Informix uses multiple server processes known and VPs
or virtual processors. The ones of these VPs that process SQL requests from
clients are known as the CPU VPs. How is the instance configured? How many
CPU VPs? Run onstat -g glo and post the output. With only a single CPU VP
(virtual processor task) the engine can only process a single session at a
time, so having multiple CPU VPs is critical to server throughput when
there are multiple sessions active.

> physical cores on the machine: 4 CPUS with 4 cores each one
>

So, 16 cores. You should be running at least 16 CPU VPs (but might have as
many as 64 running).

> I put the external table on Express but it switch to deluxe when i launch
> the
> load
>

Why? Express is faster.

> raw table partitioned is by expression, based on date: between date 1 and
> date
> 2
> The data in each file correspond to a single partition: Yes, the files are
> by
> year
>

OK, so you should definitely be loading the data using multiple sessions
one per file!

>
> Using dbcopy utility : I did not understand
>

I have published an open source package or utilities for Informix users
known as utils2_ak. That package contains, among others, a utility named
dbcopy. Dbcopy is the fastest way to move data from one table to another
and you are using external tables for the load, so using it is appropriate
(as long as the source table doesn't have any LVARCHAR columns defined
(because of a long standing bug in the Informix libraries one of the
methods that dbcopy uses to make the copy process faster fails with a
spurious error -831 if the source table has LVARCHAR type columns).

> My problems is why it start so fast and then go too slow ???? is the other
>

There can be several reasons why the copy slows down over time. Here are a
few:

- The target table's EXTENT SIZE and NEXT SIZE are too small causing the

copy to frequently have to stop to allocate a new extent.

- The storage chunks the target table resides on is RAID5 or RAID6.

- Your logical logs are too small - though with a RAW mode target table

this is an unlikely candidate here.

- Your logical log buffers are too small - this one can still affect you

due to the extent issue.

- You have LOTS of indexes which have to be rebalanced and pages split

as the table grows. Try disabling or dropping the indexes before the load

and re-enable or recreate them after the load. Make sure you are using

parallel sorting and PDQPRIORITY when the indexes rebuild so the index

rebuilds go as fast as possible.

- Any single very long SELECT statement will tend to slow down over

time. That is why when I build dbcopy I built it to select and insert the

data differently from the way INSERT INTO ... SELECT FROM works.

load from file ... can impact the load from used by extrenal table, should
> launch one load processes or should I split the files into small files??
>

You should have as many sessions loading data as there are partitions in
the table with one for each file loading to a single partition. So, as I
indicated above, there should be many external tables, one for each file.

>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

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