| From: | Jim Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com> |
|---|---|
| To: | Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp> |
| Cc: | <andres(at)2ndquadrant(dot)com>, <robertmhaas(at)gmail(dot)com>, <tgl(at)sss(dot)pgh(dot)pa(dot)us>, <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: How about to have relnamespace and relrole? |
| Date: | 2015-03-04 07:01:48 |
| Message-ID: | 54F6ADDC.8030201@BlueTreble.com |
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| Lists: | pgsql-hackers |
On 3/3/15 8:04 PM, Kyotaro HORIGUCHI wrote:
>> >Note: The OID alias types don't sctrictly comply the transaction
>> > isolation rules so do not use them where exact transaction
>> > isolation on the values of these types has a
>> > significance. Likewise, since they look as simple constants to
>> > planner so you might get slower plans than the queries joining
>> > the system tables correnspond to the OID types.
Might I suggest:
Note: The OID alias types do not completely follow transaction isolation
rules. The planner also treats them as simple constants, which may
result in sub-optimal planning.
--
Jim Nasby, Data Architect, Blue Treble Consulting
Data in Trouble? Get it in Treble! http://BlueTreble.com
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