Oracle | DBMS

Oracle DBMS_SCN Version 26ai

General Information

Library Note

Morgan's Library Page Header

The best Oracle News for FY2026

Oracle Database 26ai will be available on generic Linux platforms in January and soon on AIX and Windows

Purpose SCN Compatibility Project Utilities

AUTHID CURRENT_USER

Constants

Name	Data Type	Value
DBMS_SCN_API_MINOR_VERSION	NUMBER	0
DBMS_SCN_API_MAJOR_VERSION	NUMBER	1

Dependencies

DBMS_SCN_LIB

Documented No

First Available 12.1

Security Model Owned by SYS with EXECUTE granted to PUBLIC

Source {ORACLE_HOME}/rdbms/admin/dbmsscnc.sql

Subprograms

DISABLEAUTOROLLOVER	GETCURRENTSCNPARAMS	GETSCNPARAMSBYCOMPAT
ENABLEAUTOROLLOVER	GETSCNAUTOROLLOVERPARAMS

DISABLEAUTOROLLOVER

Disables SCN Auto Rollover dbms_scn.disableAutoRollover;

exec dbms_scn.disableAutoRollover;

      

      PL/SQL procedure successfully completed.

ENABLEAUTOROLLOVER

Enables SCN Auto Rollover dbms_scn.enableAutoRollover;

exec dbms_scn.enableAutoRollover;

      

      PL/SQL procedure successfully completed.

GETCURRENTSCNPARAMS

Returns current SCN Parameters dbms_scn.getCurrentSCNParams( rsl OUT NUMBER, headroom_in_scn OUT NUMBER, headroom_in_sec OUT NUMBER, cur_scn_compat OUT NUMBER, max_scn_compat OUT NUMBER);

DECLARE

       rsl  NUMBER;

       hscn NUMBER;

       hsec NUMBER;

       csc  NUMBER;

       msc  NUMBER;

      BEGIN

        dbms_scn.getCurrentSCNParams(rsl, hscn, hsec, csc, msc);

        dbms_output.put_line(TO_CHAR(rsl));

        dbms_output.put_line(TO_CHAR(hscn));

        dbms_output.put_line(TO_CHAR(hsec));

        dbms_output.put_line(TO_CHAR(csc));

        dbms_output.put_line(TO_CHAR(msc));

      END;

      /

      

      PL/SQL procedure successfully completed.

GETSCNAUTOROLLOVERPARAMS

Returns SCN Auto RollOver Parameters dbms_scn.GetSCNAutoRolloverParams( effective_auto_rollover_ts OUT DATE, target_compat OUT NUMBER, is_enabled OUT BOOLEAN);

DECLARE

       b       BOOLEAN;

       eart    DATE;

       tcompat NUMBER;

      BEGIN

        dbms_scn.GetSCNAutoRolloverParams(eart, tcompat, b);

        dbms_output.put_line(TO_CHAR(eart));

        dbms_output.put_line(TO_CHAR(tcompat));

        IF b THEN

          dbms_output.put_line('Enabled');

        ELSE

          dbms_output.put_line('Not Enabled');

        END IF;

      END;

      /

      

      PL/SQL procedure successfully completed.

GETSCNPARAMSBYCOMPAT

Returns False if the 'compat'; parameter value is invalid, and the OUT parameters are not updated dbms_scn.getSCNParamsByCompat( compat IN NUMBER, rsl OUT NUMBER, headroom_in_scn OUT NUMBER, headroom_in_sec OUT NUMBER) RETURN BOOLEAN;

DECLARE

       b    BOOLEAN;

       rsl  NUMBER;

       hscn NUMBER;

       hsec NUMBER;

      BEGIN

        b := dbms_scn.getSCNParamsByCompat(1, rsl, hscn, hsec);

        IF b THEN

          dbms_output.put_line('T');

        ELSE

          dbms_output.put_line('F');

        END IF;

        dbms_output.put_line(TO_CHAR(rsl));

        dbms_output.put_line(TO_CHAR(hscn));

        dbms_output.put_line(TO_CHAR(hsec));

      END;

      /

      

      PL/SQL procedure successfully completed.