Schema-Concept issues

Question

Dear all,
playing around with the implmentation of the schema concept in MaxDB 7.6.01 Build 10 I came acrosse some oddities.
1. There are still tables without a schemaname assigned in the catalog while many of the catalog-tables do have a schemaname.
This looks inconsistent to me.
select owner, schemaname, tablename from tables where owner='SUPERDBA'
OWNER;SCHEMANAME;TABLENAME
SUPERDBA;SUPERDBA;DBAN_NUM_HISTORY_PAGES
SUPERDBA;SUPERDBA;DBAN_NUM_REGION_WAITERS
SUPERDBA;SUPERDBA;DBAN_NUM_RUNNABLE_USERTASKS
SUPERDBA;SUPERDBA;DBAN_NUM_RUNNABLE_US_P_UKT
SUPERDBA;SUPERDBA;DBAN_NUM_RUNNING_USERTASKS
SUPERDBA;SUPERDBA;DBAN_NUM_TABS_FEW_SAMPLE_ROWS
SUPERDBA;SUPERDBA;DBAN_NUM_TRACES_ACTIVATED
SUPERDBA;SUPERDBA;DBAN_NUM_VBEGEXCL_USERTASKS
SUPERDBA;SUPERDBA;DBAN_NUM_VWAIT_USERTASKS
SUPERDBA;SUPERDBA;DBAN_REGION_BLOCKERS_AR
SUPERDBA;;ACTIVECONFIGURATION
SUPERDBA;;ALLOCATORSTATISTIC
SUPERDBA;;ALL_CATALOG
SUPERDBA;;ALL_COL_COMMENTS
SUPERDBA;;ALL_COL_PRIVS
SUPERDBA;;ALL_COL_PRIVS_MADE
2. It does not seem to be clear to the MaxDB who is the owner of tables that belong to a schema which is NOT names after the user who owns that schema:
select owner, schemaname, tablename from tables where owner='MONA'
  - No result
select owner, schemaname, tablename from tables where schemaname='HOTEL'
OWNER;SCHEMANAME;TABLENAME
MONA;HOTEL;CITY
MONA;HOTEL;CUSTOMER
MONA;HOTEL;CUSTOMER_ADDR
MONA;HOTEL;CUSTOM_HOTEL
MONA;HOTEL;EMPLOYEE
MONA;HOTEL;HOTEL
MONA;HOTEL;HOTEL_ADDR
MONA;HOTEL;RESERVATION
MONA;HOTEL;ROOM
but:
select owner, schemaname from schemas where owner='MONA'
OWNER                            | SCHEMANAME                       |
-------------------------------- | -------------------------------- |
MONA                             | MONA                             |
MONA                             | HOTEL                            |
Please clarify what's wrong here.
Thanks and best regards,
Lars

Answer 1

Hello Lars,
1:
the database objects you have found without a schemaname are
of type "public synonym". Public synonyms don't belong to a
schema.
2:
The result of your first SELECT is caused by setting of parameter
SERVERDBFOR_SAP. The default value is "YES". With this setting
the query
select owner, schemaname, tablename from tables where owner='MONA'
is changed internally to
select owner, schemaname, tablename from tables where schemaname='MONA'
Schema 'MONA' does exist but there are no tables within this schema. That's why there is no result. If you change the mentioned parameter to "NO" you will get a result because there are tables for owner 'MONA' in another schema ('HOTEL'). The internal change of owner to schemaname has been done with regards to compatibility with older R/3 releases. Per default for every owner an identically named schema does exist.
Your second SELECT shows the tables in schema 'HOTEL' for every user who owns tables within this schema.
Hope this explanation helps.
Best regards,
Martin
Message was edited by:
        Martin Koerner
Message was edited by:
        Martin Koerner