× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.


  • Subject: RE: Fastest way to delete records.
  • From: Zylka Marc <Zylka.Marc@xxxxxxxxx>
  • Date: Wed, 7 Feb 2001 17:57:47 -0500


I would use dynamic embedded SQL statements.  Pass in as parms 
the library name, table(file) name, the number of days you want 
to keep the data and the field name that contains the timestamp 
value.  Then build the SQL statement like this:

Eval      SQLStmt = 'Delete from ' + %TRIM(LibrIn) + 
                    '/' + %TRIM(Table) +      
                    ' where ' + %TRIM(Fieldname) +
                          ' < (current timestamp - ' +  
                          %TRIM(Numdays) + ' days)' 
          
This could produce:
        Delete from Datalib/File where field < (current timestamp - 30 days)

Now you have a program that you can use with any file that contains
timestamp.
Do not forget to include all of the rest of the sql return code checking
statements.
Also, you'll need to compile this using CRTSQLRPGI.

I don't know if this is the fastest method but it's the most flexible.

>I have a file with about 10 million records.  It is keyed on  Company #, 
>Employee #, and Time stamp.
>
>I need to delete all records that have a time stamp before a certain time 
>period.
>
>Any suggestions on the fastest approach?
>Speed is a very important factor. 

Marc Zylka

+---
| This is the RPG/400 Mailing List!
| To submit a new message, send your mail to RPG400-L@midrange.com.
| To subscribe to this list send email to RPG400-L-SUB@midrange.com.
| To unsubscribe from this list send email to RPG400-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator: david@midrange.com
+---

As an Amazon Associate we earn from qualifying purchases.

This thread ...


Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.