Re: [Proposal] Global temporary tables
От | Prabhat Sahu |
---|---|
Тема | Re: [Proposal] Global temporary tables |
Дата | |
Msg-id | CANEvxPrEAtmWN6z8T3ed81V5WZBxfrQ2LmHO1uOEOeUBh83Z-Q@mail.gmail.com обсуждение исходный текст |
Ответ на | Re: [Proposal] Global temporary tables ("曾文旌(义从)" <wenjing.zwj@alibaba-inc.com>) |
Ответы |
Re: [Proposal] Global temporary tables
(Pavel Stehule <pavel.stehule@gmail.com>)
Re: [Proposal] Global temporary tables (tushar <tushar.ahuja@enterprisedb.com>) Re: [Proposal] Global temporary tables ("曾文旌(义从)" <wenjing.zwj@alibaba-inc.com>) |
Список | pgsql-hackers |
Hi All,
Please check the below findings on GTT.
-- Scenario 1:
Under "information_schema", We are not allowed to create "temporary table", whereas we can CREATE/DROP "Global Temporary Table", is it expected ?
postgres=# create temporary table information_schema.temp1(c1 int);
ERROR: cannot create temporary relation in non-temporary schema
LINE 1: create temporary table information_schema.temp1(c1 int);
^
postgres=# create global temporary table information_schema.temp1(c1 int);
CREATE TABLE
postgres=# drop table information_schema.temp1 ;
DROP TABLE
Please check the below findings on GTT.
-- Scenario 1:
Under "information_schema", We are not allowed to create "temporary table", whereas we can CREATE/DROP "Global Temporary Table", is it expected ?
postgres=# create temporary table information_schema.temp1(c1 int);
ERROR: cannot create temporary relation in non-temporary schema
LINE 1: create temporary table information_schema.temp1(c1 int);
^
postgres=# create global temporary table information_schema.temp1(c1 int);
CREATE TABLE
postgres=# drop table information_schema.temp1 ;
DROP TABLE
-- Scenario 2:
Here I am getting the same error message in both the below cases.
We may add a "global" keyword with GTT related error message.
postgres=# create global temporary table gtt1 (c1 int unique);
CREATE TABLE
postgres=# create temporary table tmp1 (c1 int unique);
CREATE TABLE
postgres=# create temporary table tmp2 (c1 int references gtt1(c1) );
ERROR: constraints on temporary tables may reference only temporary tables
postgres=# create global temporary table gtt2 (c1 int references tmp1(c1) );
ERROR: constraints on temporary tables may reference only temporary tables
Here I am getting the same error message in both the below cases.
We may add a "global" keyword with GTT related error message.
postgres=# create global temporary table gtt1 (c1 int unique);
CREATE TABLE
postgres=# create temporary table tmp1 (c1 int unique);
CREATE TABLE
postgres=# create temporary table tmp2 (c1 int references gtt1(c1) );
ERROR: constraints on temporary tables may reference only temporary tables
postgres=# create global temporary table gtt2 (c1 int references tmp1(c1) );
ERROR: constraints on temporary tables may reference only temporary tables
Thanks,
Prabhat Sahu
On Tue, Feb 25, 2020 at 2:25 PM 曾文旌(义从) <wenjing.zwj@alibaba-inc.com> wrote:
2020年2月24日 下午5:44,Prabhat Sahu <prabhat.sahu@enterprisedb.com> 写道:On Fri, Feb 21, 2020 at 9:10 PM 曾文旌(义从) <wenjing.zwj@alibaba-inc.com> wrote:Hi,
I have started testing the "Global temporary table" feature,That's great, I see hope.
from "gtt_v11-pg13.patch". Below is my findings:
-- session 1:
postgres=# create global temporary table gtt1(a int);
CREATE TABLE
-- seeeion 2:
postgres=# truncate gtt1 ;
ERROR: could not open file "base/13585/t3_16384": No such file or directory
is it expected?Oh ,this is a bug, I fixed it.Thanks for the patch.I have verified the same, Now the issue is resolved with v12 patch.Kindly confirm the below scenario:postgres=# create global temporary table gtt1 (c1 int unique);
CREATE TABLE
postgres=# create global temporary table gtt2 (c1 int references gtt1(c1) );
ERROR: referenced relation "gtt1" is not a global temp table
postgres=# create table tab2 (c1 int references gtt1(c1) );
ERROR: referenced relation "gtt1" is not a global temp tableThanks,Prabhat SahuGTT supports foreign key constraints in global_temporary_table_v13-pg13.patchWenjing
With Regards,
Prabhat Kumar Sahu
EnterpriseDB: http://www.enterprisedb.com
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