Check Flashback Recovery Area Size

show parameter db_recovery

NAME                       TYPE        VALUE                  
-------------------------- ----------- ---------------------- 
db_recovery_file_dest      string      F:\flash_recovery_area 
db_recovery_file_dest_size big integer 900G     

show parameter db_flashback

NAME                          TYPE    VALUE 
----------------------------- ------- ----- 
db_flashback_retention_target integer 720 

select space_used/(1024*1024*1024) gb_used, space_limit/(1024*1024*1024) gb_limit from v$recovery_file_dest;

   GB_USED   GB_LIMIT
---------- ----------
427.937144        900

select * from v$flash_recovery_area_usage;

FILE_TYPE               PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES     CON_ID
----------------------- ------------------ ------------------------- --------------- ----------
CONTROL FILE                             0                         0               0          0
REDO LOG                                 0                         0               0          0
ARCHIVED LOG                           .03                       .01              13          0
BACKUP PIECE                         46.85                         0              13          0
IMAGE COPY                               0                         0               0          0
FLASHBACK LOG                          .68                       .65             122          0
FOREIGN ARCHIVED LOG                     0                         0               0          0
AUXILIARY DATAFILE COPY                  0                         0               0          0

8 rows selected. 

Set FRA limit to be 90% of the drive size

alter system set db_recovery_file_dest_size=900G SCOPE=BOTH;

Proxy User and Connect Through

Assuming we have a user called CHIUP and we want to connect to LIB1 without knowing the password, we could do the following.

P.S. This method works for Forms 12c but not Forms 10g.

As DBA

ALTER USER LIB1 GRANT CONNECT THROUGH CHIUP;

Connect via SQL*Plus

CONN CHIUP[LIB1]/xxxxxxx

Connect via SQL Developer
Hit "Advanced..." button in the connection setup window


Revoke Access
As DBA

ALTER USER LIB1 REVOKE CONNECT THROUGH CHIUP;

Reset Password By Values in 12c

select u.username,
'alter user '||u.username||' identified by values '''||s.spare4||''';' cmd
from dba_users u
join sys.user$ s
on u.user_id = s.user#
where u.username = upper('user1');

Flashback Data Archive

Setup FDA

CREATE TABLESPACE fda_data DATAFILE SIZE 1G AUTOEXTEND ON NEXT 1G;
CREATE flashback archive default FDA_1YEAR tablespace fda_data retention 1 year;
exec dbms_flashback_archive.set_context_level(level=> 'ALL');

SELECT
flashback_archive_name,
flashback_archive#,
tablespace_name,
quota_in_mb
FROM
dba_flashback_archive_ts
ORDER BY
flashback_archive_name;

SELECT
owner_name,
flashback_archive_name,
flashback_archive#,
retention_in_days,
TO_CHAR(create_time,'DD-MON-YYYY HH24:MI:SS') AS create_time,
TO_CHAR(last_purge_time,'DD-MON-YYYY HH24:MI:SS') AS last_purge_time,
status
FROM
dba_flashback_archive
ORDER BY
owner_name,
flashback_archive_name;

Add Tables to FDA

BEGIN
DBMS_FLASHBACK_ARCHIVE.register_application(
application_name       => 'PARIS_APP',
flashback_archive_name => 'FDA_1YEAR');
END;
/
BEGIN
DBMS_FLASHBACK_ARCHIVE.add_table_to_application (
application_name => 'PARIS_APP',
table_name       => 'APP_DIRECTORIES_AND_PARMS',
schema_name      => 'OPTIT');
END;
/

SELECT
a.appname,
b.faname
FROM
sys_fba_app a
JOIN sys_fba_fa b ON a.fa# = b.fa#;

SELECT
a.appname,
c.owner AS table_owner,
c.object_name AS table_name
FROM
sys_fba_app a
JOIN sys_fba_app_tables b ON a.app# = b.app#
JOIN dba_objects c ON b.obj# = c.object_id
ORDER BY
1,
2,
3;

Enable FDA by Application

BEGIN
DBMS_FLASHBACK_ARCHIVE.enable_application(
application_name => 'PARIS_APP');
END;
/

SELECT
owner_name,
table_name,
flashback_archive_name,
archive_table_name,
status
FROM
dba_flashback_archive_tables
ORDER BY
owner_name,
table_name;

Purge FDA

alter flashback archive FDA_1YEAR purge ALL;

Disable FDA by Application

BEGIN
DBMS_FLASHBACK_ARCHIVE.disable_application(
application_name => 'PARIS_APP');
END;
/

Grant FDA read access to a user

grant EXECUTE ON DBMS_FLASHBACK_ARCHIVE to USER1;
grant FLASHBACK any TABLE to USER1;

Show all Changes

SELECT
    adap.versions_startscn,
    adap.versions_starttime,
    adap.versions_endscn,
    adap.versions_endtime,
    adap.versions_xid,
    adap.versions_operation,
    CASE
            WHEN adap.versions_xid IS NOT NULL THEN dbms_flashback_archive.get_sys_context(adap.versions_xid,'USERENV','SESSION_USER')
        END
    session_user,
    CASE
            WHEN adap.versions_xid IS NOT NULL THEN dbms_flashback_archive.get_sys_context(adap.versions_xid,'USERENV','HOST')
        END
    host,
    CASE
            WHEN adap.versions_xid IS NOT NULL THEN dbms_flashback_archive.get_sys_context(adap.versions_xid,'USERENV','MODULE')
        END
    module,
    CASE
            WHEN adap.versions_xid IS NOT NULL THEN DBMS_FLASHBACK_ARCHIVE.get_sys_context(adap.versions_xid,'USERENV','CLIENT_IDENTIFIER')
        END
            client_identifier,
    adap.*
FROM
    optit.app_directories_and_parms VERSIONS BETWEEN TIMESTAMP minvalue AND maxvalue adap
WHERE
    adap.app_database = 'PARIS'
    AND   adap.app_alias = 'BIPub'
    AND   adap.app_dir_parm_no = 4
ORDER BY
    adap.versions_startscn NULLS LAST;

Flashback Database

Enable Flashback Database

ALTER DATABASE FLASHBACK ON;
ALTER SYSTEM SET DB_FLASHBACK_RETENTION_TARGET=20160; #14 days or 20160 mins

Verify Flashback Database

SELECT FLASHBACK_ON FROM V$DATABASE; 

Before you do anything drastic

CREATE RESTORE POINT RP1 GUARANTEE FLASHBACK DATABASE;

Rollback to Restore Point

SHUTDOWN IMMEDIATE
STARTUP MOUNT EXCLUSIVE
FLASHBACK DATABASE TO RESTORE POINT RP1;
ALTER DATABASE OPEN RESETLOGS;

Rollback to Timestamp

SHUTDOWN IMMEDIATE
STARTUP MOUNT EXCLUSIVE
FLASHBACK DATABASE TO TIMESTAMP  TO_TIMESTAMP('2023-01-30 11:25:00','YYYY-MM-DD HH:MI:SS');
ALTER DATABASE OPEN RESETLOGS;

Rollback to Restore Point - CDB/PDB

alter pluggable database PDB1 close immediate;
flashback pluggable database PDB1 to restore point RP1;
alter pluggable database PDB1 open resetlogs;

Remove Restore Point

DROP RESTORE POINT RP1;

How far back can I flashback

SELECT v.oldest_db_fb,
         EXTRACT (DAY FROM oldest_db_fb_interval) * 24
       + EXTRACT (HOUR FROM oldest_db_fb_interval) oldest_db_fb_hours
  FROM (SELECT CAST (
                   FROM_TZ (CAST (oldest_flashback_time AS TIMESTAMP),
                            DBTIMEZONE)
                       AT TIME ZONE 'US/Eastern'
                       AS DATE)
                   oldest_db_fb,
               ROUND ((SYSDATE - oldest_flashback_time) * 24, 1)
                   oldest_db_fb_hours,
                 SYSTIMESTAMP
               - FROM_TZ (CAST (oldest_flashback_time AS TIMESTAMP),
                          DBTIMEZONE)
                     AT TIME ZONE 'US/Eastern'
                   oldest_db_fb_interval
          FROM v$flashback_database_log) v;

List Restore Point

SELECT
    database_incarnation# AS incar,
    scn,
    name,
    time,
    storage_size,
    guarantee_flashback_database
FROM
    v$restore_point
ORDER BY
    4;