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IDS Forum

Re: IDS 12.10- BEST PRATICES Database Design

Posted By: Art Kagel
Date: Monday, 11 April 2016, at 9:38 a.m.

In Response To: IDS 12.10- BEST PRATICES Database Design (MOHD FADZIL JUSOH)

Mohd:

Notes for you:

- Test whether in your environment applications that make extensive use

of temp tables and/or sorting might perform better if your temp dbspaces

were allocated in a file system as files rather than as RAW devices. Using

COOKED files for temp dbspaces sometimes performs better than RAW because

most temp tables do not live long enough to cause the underlying file

system to flush to disk. Informix does not open temp dbspaces that are

COOKED as OSYNC or ODIRECT so they are not auto-flushed (ordinary chunks in

COOKED files are auto-flushed).

- Indexes perform best when placed in dbspaces with wide pages. Except

for trivially small indexes (on tables with few rows) all indexes perform

best on 16K pages. So you may want to make the index dbspace(s) 16K instead

of 2K.

- One index dbspace or four? That depends. If the index chunks are all

allocated from a single disk structure on your SAN then there may be no

difference in performance between one dbspace and four initially at least.

Over time, however, interleaving and fragmentation of different indexes on

the same dbspace may adversely impact performance necessitating early

rebuilding of indexes. If you have multiple index dbspaces you can

intelligently place indexes so that those that will be growing concurrently

(so multiple indexes on a highly active table or indexes in related tables

like a header/detail table pair) are placed on different dbspaces to

prevent them from fragmenting each other more than necessary. Proper extent

sizing can help here somewhat, but best practice is to avoid the problem.

- As much as possible isolate busy tables/indexes from each other and

data from indexes. This may mean dividing your SAN into more than one

physical array. Difficult to convince your storage types to do this, but

you asked about best practice and this is part of that.

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 Mon, Apr 11, 2016 at 9:01 AM, MOHD FADZIL JUSOH <fadzil@isianpadu.com>
wrote:

> Hi,
>
> We are plan to do database reorganize to follow best practices database
> design
> from IBM to get best performance for our database.
>
> Our design as below:
> (all dbspaces size 2K)
> rootdbs - 1
> logdbs - 1, allocated log file
> phydbs - 1, allocated physical log
> datadbs - 7, allocated data
> indexdbs - 4, allocated index table
> tempdsb - 4, allocated tempdbs
>
> Refer our onstat -d ouput as below:
>
> IBM Informix Dynamic Server Version 12.10.FC6AEE -- online -- Up 00:00:01
> --
> 12389868 Kbytes
>
> Dbspaces
> number flags fchunk nchunks flags owner name
> 1 40001 1 1 N B informix rootdb
> 2 40001 2 1 N B informix phydbs
> 3 40001 3 1 N B informix logdbs
> 4 42001 4 1 N TB informix tempdbs1
> 5 42001 5 1 N TB informix tempdbs2
> 6 42001 6 1 N TB informix tempdbs3
> 7 42001 7 1 N TB informix tempdbs4
> 8 40001 8 2 N B informix datadb1
> 9 40001 9 1 N B informix datadb2
> 10 40001 10 1 N B informix datadb3
> 11 40001 11 1 N B informix datadb4
> 12 40001 12 1 N B informix datadb5
> 13 40001 13 3 N B informix datadb6
> 14 40001 14 2 N B informix datadb7
> 15 40001 15 1 N B informix datadb8
> 16 40001 16 1 N B informix idxdbs1
> 17 40001 17 3 N B informix idxdbs2
> 18 40001 18 2 N B informix idxdbs3
> 19 40001 19 1 N B informix idxdbs4
>
> Chunks
> chk/dbs offset size free bpages flags pathname
> 1 1 0 1000000 984577 PO-B /dev/vg00/elixir/rootdb
> 2 2 0 500000 249947 PO-B /dev/vg00/elixir/phydbs
> 3 3 0 10000000 9249947 PO-B /dev/vg00/elixir/logdbs
> 4 4 0 2500000 2499897 PO-B /dev/vg00/elixir/tempdbs1
> 5 5 0 2500000 2499897 PO-B /dev/vg00/elixir/tempdbs2
> 6 6 0 2500000 2499897 PO-B /dev/vg00/elixir/tempdbs3
> 7 7 0 2500000 2499897 PO-B /dev/vg00/elixir/tempdbs4
> 8 8 0 10000000 0 PO-B /dev/vg00/elixir/datadb1
> 9 9 0 10000000 3830913 PO-B /dev/vg00/elixir/datadb2
> 10 10 0 10000000 2633307 PO-B /dev/vg00/elixir/datadb3
> 11 11 0 10000000 2709573 PO-B /dev/vg00/elixir/datadb4
> 12 12 0 10000000 3830913 PO-B /dev/vg00/elixir/datadb5
> 13 13 0 10000000 19 PO-B /dev/vg00/elixir/datadb6
> 14 14 0 10000000 3125 PO-B /dev/vg00/elixir/datadb7
> 15 15 0 10000000 4374729 PO-B /dev/vg00/elixir/datadb8
> 16 16 0 10000000 6433758 PO-B /dev/vg00/elixir/idxdbs1
> 17 17 0 10000000 261 PO-B /dev/vg00/elixir/idxdbs2
> 18 18 0 10000000 562711 PO-B /dev/vg00/elixir/idxdbs3
> 19 19 0 10000000 2878822 PO-B /dev/vg00/elixir/idxdbs4
> 20 17 0 2500000 288 PO-B /dev/vg00/elixir/idxdbs21
> 21 8 0 10000000 3425631 PO-B /dev/vg00/elixir/datadb12
> 22 17 0 10000000 6085694 PO-B /dev/vg00/elixir/idxdbs22
> 23 13 0 2500000 0 PO-B /dev/vg00/elixir/datadb61
> 24 18 0 2500000 1600906 PO-B /dev/vg00/elixir/idxdbs31
> 25 13 0 10000000 9146000 PO-B /dev/vg00/elixir/datadb62
> 26 14 0 10000000 9160827 PO-B /dev/vg00/elixir/datadb71
>
> Based on our design, we follow best practices or not? We plan to move all
> index table into 1 dbspaces from 4 dbspaces, can improve performance or
> not?
> Any document from IBM as references for us how to design our database
> follow
> best practices. Please help.
>
> Thank You
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--001a1135fa6894f218053035a660

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