Re: Implementation of global temporary tables?

On 7/9/15 12:45 AM, Pavel Stehule wrote:
>
> 2015-07-09 7:32 GMT+02:00 Zhaomo Yang <zhy001@cs.ucsd.edu
> <mailto:zhy001@cs.ucsd.edu>>:
>
>     >  I am not sure, if it is not useless work.
>
>     I don't understand why an implementation taking approach 2.a would
>     be useless. As I said, its performance will be no worse than current
>     temp tables and it will provide a lot of convenience to users who
>     need to create temp tables in every session.
>
>
> Surely it should be step forward. But you will to have to solve lot of
> problems with "duplicated" tables in system catalogue, and still it
> doesn't solve the main problem with temporary tables - the bloating
> catalogue - and related performance degradation.

That being the "main" problem is strictly a matter of opinion based on 
your experience. Many people don't have a performance problem today, but 
do have to deal with all the pain of handling this manually (as well as 
all the limitations that go with that).

If it's easy to fix the bloat problem at the same time as adding GLOBAL 
TEMP then great! But there's no reason to reject this just because it 
doesn't fix that issue.
-- 
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Data in Trouble? Get it in Treble! http://BlueTreble.com