Hello.
You must keep in mind that renaming the fields is the same as dropping
them : if there is a risk of use, you'll get an error.
So the only problem, if you drop them, is to remember the genuine fields
names and indexes : why don't you simply make an empty copy of the dbf
to trace them ?
USE <yourtable>
COPY TO <whatever> FOR .F. WITH PRODUCTION
Gérard.
On 02/10/2019 21:57, Michael Oke, II wrote:
I would drop the indices and use option 2 to rename the fields to drop them
after operations demonstrates that they are useless. The reduction in
record size would be well worth it.
-----------------------------
Michael Oke, II
oke...@gmail.com
661-349-6221
-----------------------------
On Wed, Oct 2, 2019 at 12:45 PM MB Software Solutions, LLC <
mbsoftwaresoluti...@mbsoftwaresolutions.com> wrote:
The main table in your inherited legacy application has 243 fields.
Through looking at the database columns individually, you have
determined that only 139 of those are used. (really!) They're of mixed
types (characters, numbers, logicals, date/time, etc.). Getting rid of
them takes you from a record size of 3093 down to 1982. In one
instance, testing showed it reduced the size of the DBF by 1/3! Some of
those unused fields have indexes on them. Let's assume I dropped the
indexes on those fields.
Do you:
1. do nothing...leave them as-is.
2. rename them to "X<fieldname>" so that you can basically mark them
useless (to be later dropped) but have the ability to rename back to
original if the app hits a snag showing a dependence on that useless
field.
3. do something else I haven't considered? (Dropping them immediately
is not an option as it's too radical/nuclear and offers no failsafe
at time of change)
tia,
--Mike
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