Re: Writing lots of records

He could also RMVPFCST to remove the "unique" constraint, then do the mass update, then ADDPFCST after it is done.
That would allow blocking to occur.  :-)

On Thursday, October 8, 2020, 7:12:09 PM EDT, Alan Campin <alan0307d@xxxxxxxxx> wrote:

With the unique index, you will not get any blocking. The OS has to check
each record to see if the key is a duplicate.

The only way I could think to speed it up is remove or disable the unique
index and OVRDBR SEQONLY for some number of records like 500 or 1000. That
will speed it up real fast but then you have to build the unique index.


On Thu, Oct 8, 2020 at 3:17 PM Evan Harris <auctionitis@xxxxxxxxx> wrote:

Last time I did something like this I messed with the blocking but the
biggest boost I got was from running chunks of the conversion in parallel.
I'm not sure if it is an option for you but I just divided the table I was
converting into chunks by record number and ran multiple jobs in parallel.

On Fri, Oct 9, 2020 at 11:00 AM <smith5646midrange@xxxxxxxxx> wrote:

I have a conversion program that will end up writing over 300M 72byte
records and I’m getting pressure to figure out if there is a way to speed
it up.  Currently the program is using an F-spec.  There are no logicals
over the file and even though there is a unique key, there is no way one
could happen during conversion so I'm not checking or monitoring for one.

Would changing to SQL help in any way?
Can I change something related to the blocking?  I’ve never messed with
blocking because the system does it automagically and I always figured it
knew more than me.
Are there other options that I might not have thought about…and no,
writing less records is not an option. 😊

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