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IDS Forum

Re: VERY slow BTS index build

Posted By: MICHAEL HOFFMAN
Date: Monday, 8 September 2014, at 6:44 p.m.

In Response To: Re: VERY slow BTS index build (Mark Ashworth)

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

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