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From: Shane Borden <[email protected]>
To: Rob Sargent <[email protected]>
Cc: [email protected]
Subject: Re: PARALLEL CTAS
Date: Mon, 12 Dec 2022 12:36:11 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<CAFcck8HhsTh70ZjQEuvm2kfx0LULJAZR3NZNHvSEX1Y5BaxAMg@mail.gmail.com>
	<[email protected]>
	<[email protected]>

I saw this as an option.  Let’s say you have a million row table.  If you copy from STDIN, do you have to spool the source table to a local file first?  Looking to replace a CTAS thats doing this all within SQL statements now.
---

Thanks,


Shane Borden
[email protected]

> On Dec 12, 2022, at 12:25 PM, Rob Sargent <[email protected]> wrote:
> 
> On 12/12/22 10:13, Shane Borden wrote:
>> The issue is there are certain performance benefits to be had by doing parallel CTAS operations and when converting from Oracle to PostgreSQL switching to a “COPY” operation isn’t feasible.
>> ---
>> 
>> Thanks,
>> 
> Today I suspect you're left with something like the following:
> - CTAS from source where 1=2 (i.e. table definition via select semantics)
> - copy from stdin (filled with intended CTAS select)
> 
> 
> 

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