question about informix sysmaster 1

Yes you can revoke any permissions from public on sysmaster database, althogh revoke connect renders rest of permissions unusable, and there is the way to specify a group for informix users at init time

generally only dba's can have connect to sysmaster, as necessary tables (systables etc) are seamlesly mirrored to other databases

thanks for your reply.
I tried to revoke all permissions from public, but it worked only for some tables;
for example:
revoke all on sysbusmlogtab from public;
revoke all on sysconfig from public;
revoke all on systabpaghdrs from public;
revoke all on sysdistcache from public;
revoke all on syslogslices from public;
revoke all on sysbuobject from public;
revoke all on sysbuworker from public;
while on the other tables (for example sysshmvals) I get the following error:

revoke all on sysshmvals from public;

211: Cannot read system catalog (sysfragments).
111: ISAM error: no record found.

any ideas on that?
thanks in advance

all sys* tables are not manipulated with grant/revoke as they somehow represent a table-like interface to informix internal structures, you can revoke only permisiions you granted on these NOT-tables (why?)

revoke all connects from sysmaster ( excluding informix of course ) and you will be safe

migrate your data off the sysmaster to new database, as ssmaster is intendet to store service information

thanks for your help.
I must prevent a user from start queries on sysmasters (for example with products as BACHMAN or ERWIN) that hung connection for the others users.
After revoke connect from public, it seams work.
Thank you.
Bye
arturo