Re: [Proposal] Global temporary tables

Hi,

I have created two  global temporary tables like this -

Case 1-
postgres=# create global  temp table foo(n int) *with
(on_c*ommit_delete_rows='true');
CREATE TABLE

Case 2-
postgres=# create global  temp table bar1(n int) *on c*ommit delete rows;
CREATE TABLE

but   if i try to do the same having only 'temp' keyword , Case 2 is
working fine but getting this error  for case 1 -

postgres=# create   temp table foo1(n int) with
(on_commit_delete_rows='true');
ERROR:  regular table cannot specifie on_commit_delete_rows
postgres=#

postgres=#  create   temp table bar1(n int) on commit delete rows;
CREATE TABLE

i think this error message need to be more clear .

regards,
tushar

On 2/25/20 7:19 PM, Pavel Stehule wrote/:
>
>
> út 25. 2. 2020 v 14:36 odesílatel Prabhat Sahu
> <prabhat(dot)sahu(at)enterprisedb(dot)com <mailto:prabhat(dot)sahu(at)enterprisedb(dot)com>>
> napsal:
>
> 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 ?
>
>
> It is ok for me. temporary tables should be created only in
> proprietary schema. For GTT there is not risk of collision, so it can
> be created in any schema where are necessary access rights.
>
> Pavel
>
>
> 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
>
> Thanks,
> Prabhat Sahu
>
> On Tue, Feb 25, 2020 at 2:25 PM 曾文旌(义从)
> <wenjing(dot)zwj(at)alibaba-inc(dot)com <mailto:wenjing(dot)zwj(at)alibaba-inc(dot)com>>
> wrote:
>
>
>
>> 2020年2月24日 下午5:44，Prabhat Sahu
>> <prabhat(dot)sahu(at)enterprisedb(dot)com
>> <mailto:prabhat(dot)sahu(at)enterprisedb(dot)com>> 写道：
>>
>> On Fri, Feb 21, 2020 at 9:10 PM 曾文旌(义从)
>> <wenjing(dot)zwj(at)alibaba-inc(dot)com
>> <mailto:wenjing(dot)zwj(at)alibaba-inc(dot)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 table
>>
>> Thanks,
>> Prabhat Sahu
>
> GTT supports foreign key constraints
> in global_temporary_table_v13-pg13.patch
>
>
> Wenjing
>
>
>
>
>
> --
>
> With Regards,
> Prabhat Kumar Sahu
> EnterpriseDB: http://www.enterprisedb.com
> <http://www.enterprisedb.com/>
>

--
regards,tushar
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