Comments on: blevel=1 http://jonathanlewis.wordpress.com/2011/08/09/blevel1/ Just another Oracle weblog Sat, 18 May 2013 11:04:10 +0000 hourly 1 http://wordpress.com/ By: Jonathan Lewis http://jonathanlewis.wordpress.com/2011/08/09/blevel1/#comment-41426 Wed, 24 Aug 2011 09:20:31 +0000 http://jonathanlewis.wordpress.com/?p=6619#comment-41426 Kumar,

In the quoted text I was talking about dealing with the problem by controlling the statistics and wasn’t making any comment about rebuilding the index (I’ve done that in Footnote 2).

I’ve added another footnote to the article pointing to an example of the type of code that could be used.

]]> By: Kumar Madduri http://jonathanlewis.wordpress.com/2011/08/09/blevel1/#comment-41423 Wed, 24 Aug 2011 04:55:38 +0000 http://jonathanlewis.wordpress.com/?p=6619#comment-41423 Hi
Can you help explain this “making sure that you overwrite the index blevel with 1 even if it has just crossed the boundary to 2.”

I understood the part where you mention about the stats collection portion (if you collect the stats after blevel=2, then you might have issues with some queries. But if you rebuild the index and then collect the stats you would be ok)

- Kumar

]]> By: BLEVEL 1 => BLEVEL 2 (Teenage Wildlife) « Richard Foote’s Oracle Blog http://jonathanlewis.wordpress.com/2011/08/09/blevel1/#comment-41415 Tue, 23 Aug 2011 11:17:18 +0000 http://jonathanlewis.wordpress.com/?p=6619#comment-41415 [...] Lewis recently wrote a really nice blog piece blevel=1 on the dangers of an index toggling between BLEVEL 1 and BLEVEL 2. I thought it would be useful [...]

]]> By: L'ascolto del venerdì http://jonathanlewis.wordpress.com/2011/08/09/blevel1/#comment-41279 Sun, 14 Aug 2011 16:45:19 +0000 http://jonathanlewis.wordpress.com/?p=6619#comment-41279 Clear!

Thank you!

]]> By: Jonathan Lewis http://jonathanlewis.wordpress.com/2011/08/09/blevel1/#comment-41271 Sun, 14 Aug 2011 08:14:16 +0000 http://jonathanlewis.wordpress.com/?p=6619#comment-41271 Lascolto del venerdì,

In general this won’f force it, but it will make it more likely – but the join order and whole shape of some plans may change as a side effect, of course.

]]> By: Lascolto del venerdì http://jonathanlewis.wordpress.com/2011/08/09/blevel1/#comment-41262 Fri, 12 Aug 2011 09:09:07 +0000 http://jonathanlewis.wordpress.com/?p=6619#comment-41262 So, if we force the blevel to 1, we can “force” Oracle to use an index?

Useful!

]]> By: jgarry http://jonathanlewis.wordpress.com/2011/08/09/blevel1/#comment-41253 Wed, 10 Aug 2011 22:39:28 +0000 http://jonathanlewis.wordpress.com/?p=6619#comment-41253 OTN search is borked, if that was what you are using, there are recent comments about it in the community forum. I simply googled part of the last italicized sentence, within quotes, ignoring the aggregator hits.

Being aware of memory lapses means you don’t have to worry about it. Memory lapses aren’t really even a problem. When people call you at home asking why you aren’t doing the keynote, and it’s the first you recall hearing about it, that’s a problem. :-D

]]> By: Jonathan Lewis http://jonathanlewis.wordpress.com/2011/08/09/blevel1/#comment-41245 Wed, 10 Aug 2011 06:17:12 +0000 http://jonathanlewis.wordpress.com/?p=6619#comment-41245 Joel,

Weird, I thought it was OTN so I did a quick search on OTN before posting this, and failed to find it.

Thanks for the link to the context.

Slightly worrying that it was only a couple of weeks ago and I had forgotten it.

]]> By: jgarry http://jonathanlewis.wordpress.com/2011/08/09/blevel1/#comment-41243 Tue, 09 Aug 2011 23:49:15 +0000 http://jonathanlewis.wordpress.com/?p=6619#comment-41243 http://forums.oracle.com/forums/thread.jspa?threadID=2245143&tstart=135

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