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IDS Forum

Re: High Extent Tables.

Posted By: Art S. Kagel (Oninit LLC)
Date: Thursday, 14 February 2008, at 6:26 p.m.

In Response To: RE: High Extent Tables. (Knox, Ernest)

Knox, Ernest wrote:

Ernest,

There are four basic methods for reorganizing a table to compress the
extents, you've listed three. Personally I prefer #4 when it's practical:

1- Cluster any index on the table (or create a clustered index just for
this and drop it). For performance clustering on a main key will help
performance anyway. Adjust the NEXT SIZE prior to the reorg.
2- Unload the table, drop it, recreate it with a larger initial and next
extent sizing, reload the data.
3- Create a new table with the proper extent sizing, copy the data,
rename the old table, rename the new table, drop the original table.
4- ALTER FRAGMENT FOR mytable INIT IN <dbspacename or fragmentation
expression>; This will work whether or not the original or new location
of the table involves fragmenting it and whether you are moving the
table to another dbspace or just reorging it into the same dbspace where
it already resides. Adjust the NEXT SIZE prior to the reorg.

Only methods 1 & 4 will preserve VIEWS, SYNONYMs, etc. based on the
table and neither of these methods incur the overhead of re-verifying
any foreign keys in the table or that reference it. On the down side it
is more likely that methods 1 & 4 may result in a small number of
extents instead of a single large one than the other methods.

Art S. Kagel
Oninit

> Sorry,
>
> This is for OSLEVEL: SUN 5.8, IDS 7.31.UD8, using HDR. 9 tables have up 300
> thousand rows, while 13 tables have less than 100 thousand rows. Extremely
> small application data.
>
> Nothing is fragmented.
>
> I can increase the first extent size if I re-create the table, but wanted to
> avoid that method, if necessary.
>
> I wanted some thoughts from others who are performing high extent reorgs, such
> as yourself.
>
> Thanks,
>
> **************************************
> Ernie Knox
> Sears Holding Co.
> IT Database Administrator Specialist
> IT Service Management, Strategy & Architecture
> 3333 Beverly Rd., B4-266A
> Hoffman Estates, IL. 60179
> Office: (847) 286-5735
> Fax: (847) 645-3874
> Pager: (800) 759-8352 Pin#: 7271042
> Email: eknox@sears.com
>
> " It's always a great day to watch Football ! "
> **************************************
>
> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
> Sebastian, Norma J.
> Sent: Thursday, February 14, 2008 4:46 PM
> To: ids@iiug.org
> Subject: RE: High Extent Tables. [11317]
>
> Ernie,
> Please post your informix version, o/s, and table sizes.
> Any of your options would work as you know, but perhaps the experts out
> here will vary their suggestions based on your table size, version,
> outage window limitations, etc..
> For example, I had been playing with table fragmentation, so I could
> also see running an "init frag" on the table to move it to new space
> thereby achieving the extent reorg/reduction you desire. Fragmentation
> was just my latest "fun thing"...=20
> It's informix, it's all fun.
> Thanks,
> Norma Jean
> =20
>
>
>> -----Original Message-----
>> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On=20
>> Behalf Of Knox, Ernest
>> Sent: Thursday, February 14, 2008 4:05 PM
>> To: ids@iiug.org
>> Subject: High Extent Tables. [11315]
>> =20
>> Quick question:=20
>> =20
>> 1. If I create a clustered index and drop it on a table with=20
>> high extents,=20
>> will that reorganize it and reduce the extents or=20
>> =20
>> 2. Do I have to unload the data, drop the table, re-create=20
>> the table, and=20
>> re-load the data or=20
>> =20
>> 3. Should I rename the original table to another name and=20
>> re-create the table=20
>> under the original name and copy the data from the renamed=20
>> table to the=20
>> re-created table?=20
>> =20
>> Which is the better way to reduce extents on a table? I don't=20
>> want to loose=20
>> table connections to synonyms, views, triggers, or stored=20
>> procedures by=20
>> dropping the table.=20
>> =20
>> I can run a dbschema for the above objects, but I would have=20
>> to separate them=20
>> from the full list, which is possible.=20
>> =20
>> Thanks,=20
>> =20
>> **************************************=20
>> Ernie Knox=20
>> Sears Holding Co.=20
>> IT Database Administrator Specialist=20
>> IT Service Management, Strategy & Architecture=20
>> 3333 Beverly Rd., B4-266A=20
>> Hoffman Estates, IL. 60179=20
>> Office: (847) 286-5735=20
>> Fax: (847) 645-3874=20
>> Pager: (800) 759-8352 Pin#: 7271042=20
>> Email: eknox@sears.com=20
>

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