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IDS Forum

Re: Usable space available in an sbspace?

Posted By: Jack Parker
Date: Thursday, 17 November 2016, at 11:30 p.m.

In Response To: Usable space available in an sbspace? (DAVID GROVE)

Doesn't look like anyone has risen to this.

sbchunks are special. In sysmaster:syschunks, aside from pages
unallocated (nfree) there are also pages allocated but unused (udfree).
On top of which, when you delete a "row" or object, you are not
necessarily making a page available for re-use, so it may not be counted
in the above. This latter case is no different than a regular data
page, where space may have freed up, but is not counted as free until
after a page compression.

I don't have a real good answer for you. Some code I wrote last week to
deal with an sbchunk includes:

SELECT sum(c.nfree*d.pagesize)+sum(c.udfree*d.pagesize) as ct

FROM sysmaster:sysdbspaces d, sysmaster:syschunks c

WHERE d.dbsnum = c.dbsnum

AND = <dbsname>

AND is_sbchunk=1 -- kind of moot is you know the dbsname.


On 11/16/16 2:08 PM, DAVID GROVE wrote:
> Informix 12.10
> Solaris 10
> I'm finding it challenging to be working with sblobs and sbspaces. Even the
> terminology is a bit confusing to me. For example, A BYTE type is a blob, but
> a BLOB type is not a blob but a smart blob. Or maybe I have that wrong. But,
> that's a rabbit trail.
> Q: Is there a way to determine how much usable space remains in an sbspace?
> We have an sbspace that is used to store photos. Server Studio showed it as
> nearly full (over 90%). We deleted about 150,000 rows in the photo table. Now
> the photo table is in a dbspace, and the photo column is type BLOB, and so, is
> actually a LOHandle that references the actual sblob which is stored in the
> (we only have one) sbspace. Now, many (probably most, but maybe not all) of
> the photos are also contained (well, their LOHandles) in another table. The
> two tables have many rows that refer to the same physical sblob.
> After the deletion of the 150K rows in the table, Server Studio shows the same
> amount of usage in the sbspace.
> I'm thinking that this is because
> 1) deleting rows in one of the tables wouldn't actually delete the sblob, if
> it were also being referenced by the other table; and,
> 2) even if some sblobs were actually deleted, this operation is still just
> marking those objects as deleted. No "giving back extents" or repacking or
> shrinking.
> So, even though there some of the existing space might now be available to be
> overwritten for new storage, the space already previously allocated would
> still be at whatever the "high water mark" was/is.
> I think.
> But, I want to know, for sure. Definitively.
> Q: How can I determine, for sure, how much space is currently available for
> actual new storage of photos (sblobs) in that existing sbspace?
> Thank you.
> DG
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.

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