Hi,

Firebird v2.5.3 - Windows 32bit server
Database page size is 8192, ODS v11.2.

I'm getting:
"key size exceeds implementation restriction for index"

when I try to create the following index:

CREATE INDEX MyIndex1 ON MyTable1 (Field1, Field2);

where Field1 is VARCHAR(80)
Field2 is VARCHAR(255)

both use the database default CHARACTER SET WIN1252 with
collation WIN1252_NOCASE as defined like this:

CREATE COLLATION WIN1252_UNICODE
FOR WIN1252^

CREATE COLLATION WIN1252_NOCASE
FOR WIN1252
FROM WIN1252_UNICODE
CASE INSENSITIVE^


As it happens, I'm happy not to have this particular index,
but I'd like to understand what's going on.

I've looked at this:
http://www.firebirdfaq.org/ip_ib_indexcalculator.htm
and I cannot find a combination for the above specification
that exceeds 2048 bytes (1/4 page size) - 1260 is the figure
it would lead me to expect, I think, though I'm not all that
clear about the distinctions between the levels of collation.
But even UTF8 at those sizes is reported at only 1675 bytes.

Is the restriction in this case expected, or should I be
looking for some other problem? Maybe I have my collation
set up incorrectly?

--
Geoff Worboys
Telesis Computing Pty Ltd