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IDS Forum

Re: b-tree scanner tuning and expected behavior

Posted By: John Miller iii
Date: Tuesday, 22 July 2008, at 12:11 p.m.

In Response To: Re: b-tree scanner tuning and expected behavior (Obnoxio The Clown)

I would first allow range scans to be run on your system. Currently
these are disabled. To do this you can run onmode -C rangesize 100
This means all tables with more than 100 pages will use range scaning.
To make this permanent you need to set the configuration parameter
BTSCANNERS. To include previously mentioned recommendation
your configuration parameter should look like this.

BTSCANNERS num=3D2,threshold=3D500000,rangsize=3D100

GERARDO PADIERNA said:
> here the outputs, and thanks for the references.
> Regards.
>
> juanclu1-[PROD]-(db1):~ $ onstat -C
>
> IBM Informix Dynamic Server Version 9.40.FC9 -- On-Line -- Up 5 days
> 21:33:27
> -- 2015232 Kbytes
>
> Btree Cleaner Info
> BT scanner profile Information
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D
> Active Threads 8
> Global Commands 20000 Building hot list
> Number of partition scans 8433
> Main Block 0x0000000156edad58
> BTC Admin 0x000000015b9b2850
>
> BTS info id Prio Partnum Key Cmd
> 0x1595ffbb0 0 High 0x00000000 0 20000 Building hot list
>
> Number of leaves pages scanned 1717756000

Eeek!

> Number of leaves with deleted items 2126059045
>
> Time spent cleaning (sec) 71884

EEEEEEEEEEEEEEEEEEEEEEEEEEEEEK!

OK, only two of these cleaners are actually doing anything, but between=

them they have been active for nearly 25% of your uptime. That is insan=
e.
Increase your threshold to at least 500000, drop the other 6 cleaners a=
nd
then monitor the situation.

onmode -C threshold 500000

You may want to increase it even more.

> 0x15d7aebb0 1 High 0x00000000 0 20000 Building hot list
> Time spent cleaning (sec) 56335

> 0x1693518d8 2 Low 0x00000000 0 20000 Building hot list
> Time spent cleaning (sec) 2

> 0x1640809b0 3 Low 0x00000000 0 20000 Building hot list
> Time spent cleaning (sec) 4

> 0x169a26028 4 High 0x00000000 0 40 Yield N
> Time spent cleaning (sec) 9

> 0x15c9f38f0 5 High 0x006000CC 1 100000 Scan index
> Time spent cleaning (sec) 8

> 0x1697e1ba8 6 Low 0x00000000 0 20000 Building hot list
> Time spent cleaning (sec) 2

> 0x1560165a8 7 Low 0x00000000 0 20000 Building hot list
> Time spent cleaning (sec) 3

> __________________________________________________________________
>
> juanclu1-[PROD]-(db1):~ $ onstat -C hot
>
> IBM Informix Dynamic Server Version 9.40.FC9 -- On-Line -- Up 5 days
> 21:35:15
> -- 2015232 Kbytes
>
> Btree Cleaner Info
>
> Index Hot List
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
> Current Item 2 List Created 12:00:54
>
> List Size 1 List expires in 0 sec
>
> Hit Threshold 100000 Range Scan Threshold -1

Try setting range to 100: onmode -C range 100

> Partnum Key Hits
> 0x006000CB 1 8789 *
>
> ____________________________________________________________________
>
> juanclu1-[PROD]-(db1):~ $ onstat -C clean
>
> IBM Informix Dynamic Server Version 9.40.FC9 -- On-Line -- Up 5 days
> 21:35:38
> -- 2015232 Kbytes
>
> Btree Cleaner Info
>
> Index Cleaned Statistics
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D
> Partnum Key Dirty Hits Clean Time Pg Examined Items Del Pages/Sec
> 0x006000c9 1 1192 15 371030 1388602 24735.33
> 0x006000ca 1 7470 92 466585 1597270 5071.58
> 0x006000cb 1 12682 161 569000 1733933 3534.16
> 0x006000cc 1 C 1690589 292236 -171845166 1725977 14108.88

This is interesting ... why so many deletes?

> 0x00600096 1 750 15 353304 1363336 23553.60
> 0x006000bb 1 1014 12 127990 710001 10665.83

Check all these partitions. See if there are any indexes you can drop.
Have a look at your application, it seems to be doing a lot of index
deleting...

--
Bye now,
Obnoxio

http://obotheclown.blogspot.com/

***********************************************************************=
********

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