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IDS Forum

Re: VERY slow BTS index build

Posted By: Art Kagel
Date: Monday, 8 September 2014, at 7:48 p.m.

In Response To: Re: VERY slow BTS index build (MICHAEL HOFFMAN)

Don't remember the thread details. What version? What OS? What is
VP_MEMORY_CACHE_KB set to? Are you using PDQPRIORITY AND PSORT_NPROCS
during the build?

Art

Art
On Sep 8, 2014 6:45 PM, "MICHAEL HOFFMAN" <mrh@panix.com> wrote:

> Mark,
> That is the kind of response times I expect from Informix.
> I have no idea why these builds are taking so long. It seems as if varchar
> works faster than char, but they take a few hours as well.
>
> This system is a fairly idle server, used for QA mostly. When the BTS
> build is
> running, 'top' shows the Informix oninits sitting above all else, and the
> 'top' session next in line -- ie: nothing else is happening.
>
> I just ran a new test on a different column: char(25) with only *4* values
> for
> 980K rows. 850K are the same value. This should be a fairly simple index to
> create ... after all, a regular index on the column completes in about 3
> minutes.
> After an hour-and-a-half, I stopped the test. No reason to wait any longer,
> that's just too slow.
>
> I dropped the Buffers down to 200000 and LRUs at 8. Pushed the SHMVRTSIZE
> to
> 2048000 -- the entire database should fit into that! SHMADD = 256000.
> EXTSHMADD = 4096.
>
> Looking at onstat -p, both Buffer Rates are above 99%. Good!
> Looking at onstat -p, both Buffer Rates are above 99%. Good!
> Looking at onstat -D shows some writes to bts_temp space (created the same
> way
> you did, with the '-t' option) and about 108000 reads from the databases
> dbspace.
> onstat -g opn shows several temp tables being opened and closed constantly.
>
> Hmm... after an 1.5 hours, it only did 108K reads? BTS must be sorting each
> row as it builds the index?
>
> Oh, and here's a CRAZY issue: immediately upon starting the build, the
> engine
> dynamically adds *4* "new extension shared memory" segments! By the time I
> had
> stopped the build, *8 segnemts* had been added. This boosted the virtual
> memory to 2077696.
> Why would the engine need more VM? As I said, with the boost of SHMVRTSIZE
> to
> 2GB, the entire database can fit there.
>
> Strange, huh? Art, you got any ideas?
>
> Thanks again! Really hoping to find an answer so I can convince the Big
> Boys
> to sign off on using BTS.
>
> Michael
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

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