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IDS Forum

Re: Drop or resize fragment

Posted By: Jonathan Leffler
Date: Saturday, 23 March 2013, at 7:31 a.m.

In Response To: Re: Drop or resize fragment (John Miller iii)

On Fri, Mar 22, 2013 at 11:31 AM, John Miller iii <miller3@us.ibm.com>wrote:

>
> dGhlIHRhYmxlIHNocmluayBmdW5jdGlvbiB3aWxsIHJlbW92ZSBhbGwgZnJlZSBzcGFjZSBhdCB0
>
> aGUgZW5kIG9mIHRoZQ0KdGFibGUgdG8gdGhlDQpmaXJzdCBleHRlbnQgc2l6ZS4gICBZb3UgY2Fu
>
> IGZpcnN0IGFsdGVyIHRoZSB0YWJsZSBhZGp1c3RpbmcgdGhlIGZpcnN0DQpleHRlbnQgc2l6ZSwg
>
> dGhlbiByZW1vdmUNCmFsbCB0aGUgZnJlZSBzcGFjZSBhdCB0aGUgZW5kIG9mIGVhY2ggZnJhZ21l
>
> bnQgYnkgdXNpbmcgdGhlIHNocmluayBjb21tYW5kLg0KDQpleGVjdXRlIGZ1bmN0aW9uIHRhc2so
>
> ImZyYWdtZW50IHNocmluayIsIHBhcnRudW0pDQoNCk9SDQoNCg0KZXhlY3V0ZSBmdW5jdGlvbiB0
>
> YXNrKCJ0YWJsZSBzaHJpbmsiLCAidGFibmFtZSIsImRic25hbWUiKQ0KDQoNCkpvaG4gRi4gTWls
>
> bGVyIElJSQ0KU1RTTSwgTGVhZCAgQXJjaGl0ZWN0DQptaWxsZXIzQHVzLmlibS5jb20NCjUwMy03
>
> NDctMTM2Ng0KSUJNIEluZm9ybWl4IER5bmFtaWMgU2VydmVyIChJRFMpDQoNCg0KDQppZHMtYm91
>
> bmNlc0BpaXVnLm9yZyB3cm90ZSBvbiAwMy8yMi8yMDEzIDEwOjQ3OjI0IEFNOg0KDQo+IEZyb206
>
> ICJORUlMIFRSVUJZIiA8bmVpbC50cnVieUBhcmRlbnRhLmNvbT4NCj4gVG86IGlkc0BpaXVnLm9y
>
> ZywNCj4gRGF0ZTogMDMvMjIvMjAxMyAxMDo0OCBBTQ0KPiBTdWJqZWN0OiBEcm9wIG9yIHJlc2l6
>
> ZSBmcmFnbWVudCAgWzI5ODgwXQ0KPiBTZW50IGJ5OiBpZHMtYm91bmNlc0BpaXVnLm9yZw0KPg0K
>
> PiBXZSd2ZSBjcmVhdGVkIGEgdGFibGUgd2l0aCBtdWx0aXBsZSBmcmFnbWVudHMuIEl0J3MgZnJh
>
> Z21lbnRlZCBieQ0KZXhwcmVzc2lvbg0KPiBzbyBlYWNoIGZyYWdtZW50IGhvbGRzIGEgbW9udGgn
>
> cyBkYXRhIGFuZCBpcyBhYm91dCA0ZyBpbiBzaXplLg0KPg0KPiBOb3cgb25lIG9mIHRoZSBkYnNw
>
> YWNlcyBpcyBmdWxsISBJJ2QgbGlrZSB0byBkcm9wIHNvbWUgb2YgdGhlICpmdXR1cmUqDQo+IGZy
>
> YWdtZW50cyB0aGF0IGRvbid0IGhhdmUgYW55dGhpbmcgaW4gdGhlbSB5ZXQsIHNheSB0aGUgb25l
>
> IGZvciAyMDEzXzA2LA0Kb3INCj4gZXZlbiBiZXR0ZXIgcmVzaXplIGl0IG11Y2ggc21hbGxlci4N
>
> Cj4NCj4gSSBjYW4ndCBzZWUgdGhlIHN5bnRheCBmb3IgcmVkdWNpbmcgdGhlIGZpcnN0IGV4dGVu
>
> dCBzaXplIG9mIGEgZnJhZ21lbnQuDQo+DQo+IFdoZW4gSSB0cmllZDoNCj4gQUxURVIgRlJBR01F
>
> TlQgT04gVEFCTEUgdGFibGVuYW1lIERST1AgUEFSVElUSU9OIHAyMDEzXzA2DQo+DQo+IEkgZ290
>
> IOKAnGRiczAyIGlzIGZ1bGzigJ0uIFdoaWNoIGlzIHRydWUuIEJ1dCB3aGF0IHdhcyBpdCB0cnlp
>
> bmcgdG8gZG8/DQo+IFBlcmhhcHMgaWYNCj4gSSBhZGRlZCBqdXN0IGEgdGlueSBjaHVuayB0byBk
>
> YnMwMiBJJ2QgYmUgT0s/DQo+DQo+IFdoYXQgSSByZWFsbHkgZG8gTk9UIHdhbnQgaXMgZm9yIHRo
>
> ZSB3aG9sZSB0YWJsZSwgYWxsIDEgYmlsbGlvbiByb3dzLCB0bw0KYmUNCj4gcHJvY2Vzc2VkLiBU
>
> aGlzIGZyYWdtZW50IGlzIGVtcHR5IGFuZCB0aGUgb3BlcmF0aW9uIHNob3VsZCwgSSBob3BlLCBi
>
> ZQ0KPiBpbnN0YW50YW5lb3VzPw0KPg0KPiBUaGFua3MNCj4gTg0KPg0KPg0KPg0KKioqKioqKioq
>
> KioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioq
>
> KioqKioqKioqKioqKg0KDQo+ICAgRm9ydW0gTm90ZTogVXNlICJSZXBseSIgdG8gcG9zdCBhIHJl
> c3BvbnNlIGluIHRoZSBkaXNjdXNzaW9uIGZvcnVtLg0KPg==
>

Which, being translated and truncated (removing much of the email to which
it reponds), says:

the table shrink function will remove all free space at the end of the
table to the
first extent size. You can first alter the table adjusting the first
extent size, then remove
all the free space at the end of each fragment by using the shrink command.

execute function task("fragment shrink", partnum)

OR

execute function task("table shrink", "tabname","dbsname")

John F. Miller III
STSM, Lead Architect
miller3@us.ibm.com
503-747-1366
IBM Informix Dynamic Server (IDS)

ids-bounces@iiug.org wrote on 03/22/2013 10:47:24 AM:

> From: "NEIL TRUBY" <neil.truby@ardenta.com>
> To: ids@iiug.org,
> Date: 03/22/2013 10:48 AM
> Subject: Drop or resize fragment [29880]
> Sent by: ids-bounces@iiug.org
>
> We've created a table with multiple fragments.

John's second attempt said (with most of the email being responded to
included):

VGhlIHRhYmxlL2ZyYWdtZW50IHNocm
luayBmdW5jdGlvbiB3aWxsIHJlbW92ZSBhbGwgZnJlZSBz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=

Which, being translated (and marginally truncated and cleaned up), is:

The table/fragment shrink function will remove all free space at the end of
> the table/fragment
> to the first extent size. You can first alter the table adjusting the
> first extent size, then remove
> all the free space at the end of each fragment by using the shrink command.
>
> execute function task("fragment shrink", partnum)
>
> OR
>
> execute function task("table shrink", "tabname","dbsname")
>
>
>
> John F. Miller III
> STSM, Lead Architect
> miller3@us.ibm.com
> 503-747-1366
> IBM Informix Dynamic Server (IDS)
>
>
> ids-bounces@iiug.org wrote on 03/22/2013 10:47:24 AM:
>
> > From: "NEIL TRUBY" <neil.truby@ardenta.com>
> > To: ids@iiug.org,
> > Date: 03/22/2013 10:48 AM
> > Subject: Drop or resize fragment [29880]
> > Sent by: ids-bounces@iiug.org
> >
> > We've created a table with multiple fragments. It's fragmented by
> expression
> > so each fragment holds a month's data and is about 4g in size.
> >
> > Now one of the dbspaces is full! I'd like to drop some of the *future*
> > fragments that don't have anything in them yet, say the one for 2013_06,
> or
> > even better resize it much smaller.
> >
> > I can't see the syntax for reducing the first extent size of a fragment.
> >
> > When I tried:
> > ALTER FRAGMENT ON TABLE tablename DROP PARTITION p2013_06
> >
> > I got “dbs02 is full”. Which is true. But what was it trying to do?
> > Perhaps if
> > I added just a tiny chunk to dbs02 I'd be OK?
> >
> > What I really do NOT want is for the whole table, all 1 billion rows, to
> be
> > processed. This fragment is empty and the operation should, I hope, be
> > instantaneous?
> >
> > Thanks
> > N
>

--
Jonathan Leffler <jonathan.leffler@gmail.com> #include <disclaimer.h>
Guardian of DBD::Informix - v2013.0118 - http://dbi.perl.org
"Blessed are we who can laugh at ourselves, for we shall never cease to be
amused."

--047d7b67098f7eb64004d895ea7b

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