Horton

Re: [Proposal] Global temporary tables

曾文旌 (义从) <wenjing.zwj@alibaba-inc.com>

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From: 曾文旌(义从) <wenjing.zwj@alibaba-inc.com>
To: tushar <tushar.ahuja@enterprisedb.com>
Cc: "Prabhat Sahu" <prabhat.sahu@enterprisedb.com>, "Pavel Stehule" <pavel.stehule@gmail.com>, "Robert Haas" <robertmhaas@gmail.com>, "Tomas Vondra" <tomas.vondra@2ndquadrant.com>, "Konstantin Knizhnik" <k.knizhnik@postgrespro.ru>, "PostgreSQL Hackers" <pgsql-hackers@postgresql.org>, 蔡松露(子嘉) <zijia@taobao.com>, Cai, Le <le.cai@alibaba-inc.com>, 萧少聪(铁庵) <shaocong.xsc@alibaba-inc.com>
Date: 2020-03-06T07:08:30Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. PageAddItemExtended(): Add LP_UNUSED assertion.

  2. Remove temporary files after backend crash

  3. Fix comment in indexing.c

  4. Fix failure to ignore leftover temp tables after a server crash.


> 2020年3月5日 下午10:19，tushar <tushar.ahuja@enterprisedb.com> 写道：
> 
> On 3/3/20 2:10 PM, 曾文旌(义从) wrote:
>> I fixed in global_temporary_table_v16-pg13.patch.
> Please refer this scenario -
> 
> --Connect to psql -
> 
> postgres=# alter system set max_active_global_temporary_table =1;
> ALTER SYSTEM
> 
> --restart the server (./pg_ctl -D data restart) 
> 
> --create global temp table 
> 
> postgres=# create global temp  table ccc1  (c int);
> CREATE TABLE
> 
> --Try to Create another global temp table
> 
> postgres=# create global temp  table ccc2  (c int);
> WARNING:  relfilenode 13589/1663/19063 not exist in gtt shared hash when forget
> ERROR:  out of shared memory
> HINT:  You might need to increase max_active_gtt.
> 
> postgres=# show max_active_gtt;
> ERROR:  unrecognized configuration parameter "max_active_gtt"
> postgres=# 
> postgres=# show max_active_global_temporary_table ;
>  max_active_global_temporary_table 
> -----------------------------------
>  1
> (1 row)
> 
> postgres=# 
> 
> I cannot find "max_active_gtt"  GUC . I think you are referring to  "max_active_global_temporary_table" here ? 
> 
You're right.

Fixed in global_temporary_table_v17-pg13.patch


Wenjing


> also , would be great  if we can make this error message  user friendly like  - "max connection reached"  rather than memory error
> 
> -- 
> regards,tushar
> EnterpriseDB  https://www.enterprisedb.com/ <https://www.enterprisedb.com/>
> The Enterprise PostgreSQL Company