Informix - Default permissions when creating table - database

Question

So, Im using Informix DB engine to create my database. I have noticed something peculiar I cannot find information about in the official IBM page.
If you check the definition of my table, there is a line at the end saying :
revoke all on "gabriel.barrios".proveedores from "public" as "gabriel.barrios";
I did not write that, I simply defined the table attributes. But it seems as the engine itself is adding that.
Is this the case?
And if it is, how can I cahnge this default behaviour.
Additionally, could someone clarify ths line's output :
{ TABLE "gabriel.barrios".proveedores row size = 110 number of columns = 4 index size = 9 }
[gabriel.barrios#informix1 ~]$ dbschema -d practico_matias_barrios -t Proveedores
DBSCHEMA Schema Utility INFORMIX-SQL Version 11.70.UC8W1
{ TABLE "gabriel.barrios".proveedores row size = 110 number of columns = 4 index size = 9 }
create table "gabriel.barrios".proveedores
(
id serial not null ,
nombre varchar(50) not null constraint "gabriel.barrios".proveedor_nombre_vacio,
situacion integer not null constraint "gabriel.barrios".proveedor_situacion_vacio,
ciudad varchar(50) not null constraint "gabriel.barrios".proveedor_ciudad_vacio,
primary key (id) constraint "gabriel.barrios".proveedor_clave_primaria
);
revoke all on "gabriel.barrios".proveedores from "public" as "gabriel.barrios";

Answer 1

Informix default behavior is to grant privileges to the PUBLIC role.
As per the documentation (Table-level privileges) :
In an ANSI-compliant database, only the table owner has any
privileges. In other databases, the database server, as part of
creating a table, automatically grants to PUBLIC all table privileges
except Alter and References, unless the NODEFDAC environment variable
has been set to 'yes' to withhold all table privileges from PUBLIC.
When you allow the database server to automatically grant all table
privileges to PUBLIC, a newly created table is accessible to any user
with the Connect privilege. If this is not what you want (if users
exist with the Connect privilege who should not be able to access this
table), you must revoke all privileges on the table from PUBLIC after
you create the table.
What your are seeing is dbschema always revoking privileges from PUBLIC on the create table output and then adding them back on the privileges output.
$ dbschema -d mydatabase -t default_privileges
DBSCHEMA Schema Utility INFORMIX-SQL Version 12.10.FC12
{ TABLE "myuser".default_privileges row size = 4 number of columns = 1 index size = 0 }
create table "myuser".default_privileges
(
id integer
);
revoke all on "myuser".default_privileges from "public" as "myuser";
Using dbschema privileges output and filtering by table default_privileges :
$ dbschema -d mydatabase -p all | grep default_privileges
grant select on "myuser".default_privileges to "public" as "myuser";
grant update on "myuser".default_privileges to "public" as "myuser";
grant insert on "myuser".default_privileges to "public" as "myuser";
grant delete on "myuser".default_privileges to "public" as "myuser";
grant index on "myuser".default_privileges to "public" as "myuser";