Re: How to implement the skip errors for copy from ?

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От xbzhang
Тема Re: How to implement the skip errors for copy from ?
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Msg-id 2014061711543320946949@kingbase.com.cn
обсуждение исходный текст
Ответ на How to implement the skip errors for copy from ?  (xbzhang <xbzhang@kingbase.com.cn>)
Ответы Re: How to implement the skip errors for copy from ?
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Use subtransaction , the tuples that had inserted into heap  must be inserted again  when some exception is raised,
it is too expensive.
My solution is :
1. delete the tuple that caused the error tuple;
2. release all the resources when  inserting  the tuple;
3. continue insert next tuple
Is it feasible?  Anybody give me some suggestion?

张晓博   研发二部

北京人大金仓信息技术股份有限公司

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邮箱：xbzhang@kingbase.com.cn

 
Date: 2014-06-17 02:37
Subject: Re: [HACKERS] How to implement the skip errors for copy from ?
Pavel Stehule wrote:
> 2014-06-16 11:46 GMT+02:00 xbzhang <xbzhang@kingbase.com.cn>:
>
> >
> > I want to implement the skip errors for copy from,lik as :
> > create table A (c int primary key);
> > copy A from stdin;
> > 1
> > 1
> > 2
> > \.
> >
> > copy will failed:
> > ERROR: duplicate key violates primary key constraint "CC_PKEY"
> > CONTEXT: COPY CC, line 2: "1"
> >
> > I want skip the error, and continue to copy the reset of tuple. The result
> > will be that there are two rows in table A: 1 and 2.
> >
> > how to implement that ? Anybody give me some suggestion?
>
> you should to reimplement a copy procedure to use a subtransactions. Using
> subtransaction for any row is too expensive, but you can do subtransaction
> per 1000 rows, and when some exception is raised, then store data per one
> row/one subtransaction.
 
See http://pgloader.io/ for a ready-made solution.
 
--
Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
 
 
 
 
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