I am migrating an old DOS app to VFP 9. The client does not even want to
hear about SQL Server or any flavour of an outside engine (MYSQL,MSSQL,etc)
The DOS program uses several tables that have hundreds of thousands of
records and they use the application in a LAN
If I use the tables as the old FOX DOS does, namely, open the table and
navigate it with the arrow keys or the pageup, pagedown, end,top keys,
the screens fly.
There is this table that has over a million records. I want to use a
cursor adapter to do handle it, but find that the sql command takes over
5 seconds to open the table.
I figured I would use a pagination scheme, that is, select 100 records
at a time with the cursor adapter, let the user edit any records they
want, and then select another batch of 100 records. Use the page up,
page down keys, etc to select batches of records. But every time I issue
the select statement, it takes about 5 seconds to bring the record set.
The table has a primary key, which is used by the cursor adapter. If I
do not use a CA and simply use a SQL statement, the delay is the same.
And we are talking my developing machine (single user)
There are no Rushmore issues here, as far as I can tell, because I only
have the PK index and the select statement just uses commands like:
select top 100 * from thetable order by pk asc
select top 100 * from the table where pk > 100 order by pk asc
etc
Why would it take so long to select the records, if the table is sitting
in my own HD?
I fear to think what it will do if the table is in a LAN server.
Rafael Copquin
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