From: gogala.mladen@gmail.com   
      
   On Tue, 31 May 2016 15:23:46 +1000, Noons wrote:   
      
   > Funny how they never grew as much since then.  Wonder why, with all the   
   > geniuses helping?...   
      
   I used to like Pete Sharman, especially his work on oracle-l, but he   
   seems to have switched to marketing and is now trying to sell OEM. OEM is   
   an attempt to replace Nagios, Zabbix, Cacti and alike, but I am not very   
   optimistic. I would always select Nagios over OEM, because of two things:   
      
   1) MUCH larger installed base and the true open source community.   
   2) It doesn't have WebLogic. I don't use WebLogic, if it is up to me.   
      
   That would probably put me at odds with Pete, had he not changed the   
   profession.   
      
   >   
   > Since around 98 they started to abuse licensing and since 2009 they've   
   > been a joke, around here.  To the point where they can't even get enough   
   > attendees Australia-wide to run a yearly conference!...   
      
   I used to be a regular on NYOUG, but not any more. There is nothing   
   useful for me as a techie on NYOUG. Oracle closed the technical   
   information and is only dispatching the much needed technical info to   
   chosen few, and not on the conferences. Now that you mentioned 12c, it has   
   multi-threaded log writer, based on polling, rather than post-wait event   
   model. Of course, there is no documentation. The only documentation that   
   I've found is how to turn it off, because of a bug which may cause the DB   
   to hang.   
   As for Oracle 12c, it is an old wisdom to wait for the .2 version. Oracle   
   tried its best to get people to switch, but I would not do that, if the   
   decision was up to me. Oracle 10.1 was disastrously unstable, just like   
   the early releases of 10.2. I wonder if you remember the bug in the   
   10.2.0.1 client which would hang after 200 days, necessitating a reboot?   
   The same goes for 11.1 and the early releases of 11.2. I was having fun   
   with the process burning CPU like crazy in 11.2.0.1 and calibrate_io   
   turning on parallel query for almost everything in 11.2.0.2. Oracle even   
   advised the customers to delete the results from the dictionary table   
   containing the results of calibrate_io, which I found hilarious. I am   
   steering clear of automatic degree of parallelism ever since, especially   
   because I don't see what would it buy me, except the need to license more   
   CPU cores. I have always considered parallel query to be reserved for   
   very special queries, with the decision to use parallelism always   
   warranting a careful consideration.   
   The changes in the 12c optimizer are very substantial, the foremost one   
   being the introduction of the most popular values. There have been other   
   changes with the sharing cursors and switching the join method amid   
   execution, if the optimizer finds discrepancies between the calculated   
   and the actual values. Bugs are to be expected, with such an extensive   
   rewrite. And bugs and the lack of stability in the optimizer plans equal   
   possible performance disaster in the critical applications. Personally, I   
   would not switch before 12.2.0.3.   
      
      
      
      
   --   
   Mladen Gogala   
   The Oracle Whisperer   
   http://mgogala.byethost5.com   
      
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