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From: Michael Peppler <mpeppler at peppler dot org>
Subject: Re: How can I get the speed I need?
Date: Jul 20 1999 2:19PM writes:
 > I need to move massive amount of data (7 million rows) from one database to 
 > another.
 > The two databases have different tables and different columns.  I cannot do a 
 > straightforward bcp in.
 > The only approved method right now is to bcp out from one database and read 
 > the data file row by row and then insert into various tables to the other 
 > database.  
 > This has to be done as fast as possible.
 > For a bulk estimate on how long the process will take,  I tried a simple 
 > case.  A 2000
 > row data file is read row by row and then converted column by column and 
 > finally insert into a (one for now) table using SybTools (built on top of 
 > Sybase::CTlib) ExecSql function call one row a time.  The result is very 
 > disappointing. I can only insert about 20 rows a second.  (Most of time is 
 > indeed spent on insertion,  not on those string manipulations at all.)  

Drop the indexes on the target tables. This should make things faster
(or, like others have suggested, use views and bcp, or use sybperl to
extract the data, format correct bcp files for the target database,
and bcp these back in.)

For that last option you could even create a named pipe, and use write 
to the named pipe from the perl script and read from the named pipe in 
the bcp process (so both processes can run in parallel)

Michael Peppler         -||-  Data Migrations Inc.    -||-
Int. Sybase User Group  -||-
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