Horton

Re: [Proposal] Global temporary tables

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

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From: 曾文旌 <wenjing.zwj@alibaba-inc.com>
To: tushar <tushar.ahuja@enterprisedb.com>
Cc: Pavel Stehule <pavel.stehule@gmail.com>, Robert Haas <robertmhaas@gmail.com>, Prabhat Sahu <prabhat.sahu@enterprisedb.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: 2020-04-09T12:58:02Z
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4月9日 下午7:46，tushar <tushar.ahuja@enterprisedb.com> 写道：
> 
> On 4/7/20 2:27 PM, 曾文旌 wrote:
>> Vacuum full GTT, cluster GTT is already supported in global_temporary_table_v24-pg13.patch.
> 
> Hi Wenjing,
> 
> Please refer this scenario , where reindex   message is not coming next time ( after reconnecting to database) for GTT
> 
> A)
> --normal table
> postgres=# create table nt(n int primary key);
> CREATE TABLE
> --GTT table
> postgres=# create global temp table gtt(n int primary key);
> CREATE TABLE
> B)
> --Reindex  , normal table
> postgres=# REINDEX (VERBOSE) TABLE  nt;
> INFO:  index "nt_pkey" was reindexed
> DETAIL:  CPU: user: 0.00 s, system: 0.00 s, elapsed: 0.00 s
> REINDEX
> --reindex GTT table
> postgres=# REINDEX (VERBOSE) TABLE  gtt;
> INFO:  index "gtt_pkey" was reindexed
> DETAIL:  CPU: user: 0.00 s, system: 0.00 s, elapsed: 0.00 s
> REINDEX
> C)
> --Reconnect  to database
> postgres=# \c
> You are now connected to database "postgres" as user "tushar".
> D) again perform step B)
> 
> postgres=# REINDEX (VERBOSE) TABLE  nt;
> INFO:  index "nt_pkey" was reindexed
> DETAIL:  CPU: user: 0.00 s, system: 0.00 s, elapsed: 0.00 s
> REINDEX
> postgres=# REINDEX (VERBOSE) TABLE  gtt;   <-- message  not coming
> REINDEX
Yes , Since the newly established connection is on the db, the GTT store file is not initialized, so there is no info message.

> 
> -- 
> regards,tushar
> EnterpriseDB  https://www.enterprisedb.com/
> The Enterprise PostgreSQL Company