12c Database TEMPORAL VALIDITY & FLASHBACK ARCHIVE Testing
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The document discusses the implementation and testing of temporal validity features in databases, specifically using SQL commands to manage valid-time dimensions via period for clauses. It illustrates how to create tables with temporal validity, apply updates, and manage data visibility through procedures like dbms_flashback_archive. The process includes creating flashback archives, modifying data across schemas, and retrieving historical data through versioning.
![SQL> create table FA_sales as select * from sh.sales;
Table created.
SQL> create Flashback Archive test_nfaopt tablespace TEST_ARCH RETENTION 10 DAY NO OPTIMIZE DATA;
Flashback archive created.
[Ref: http://docs.oracle.com/cd/E16655_01/server.121/e17209/statements_5011.htm]
SQL> alter table FA_sales flashback archive test_nfaopt;
Table altered.
Set the context level collection for FA_sales table
-----------------------------------------------SQL> exec dbms_flashback_archive.set_context_level('TYPICAL');
PL/SQL procedure successfully completed.
Make some update on Flashback table from other schema
----------------------------------------------------SQL> conn sh/sh
Connected.
SQL> update monowar.FA_sales set CUST_ID=3333 where CUST_ID=8865;
243 rows updated.
SQL> commit;
Commit complete.
Check the flashback table status
---------------------------------------SQL> select * from dba_flashback_archive_tables;
TABLE_NAME
-------------------------------------------------------------------------------OWNER_NAME
-------------------------------------------------------------------------------FLASHBACK_ARCHIVE_NAME
-------------------------------------------------------------------------------ARCHIVE_TABLE_NAME
STATUS
----------------------------------------------------- ------------FA_SALES
MONOWAR
TEST_NFAOPT
SYS_FBA_HIST_110567
ENABLED
--- NOTE: DBA_FLASHBACK_ARCHIVE_TABLES for NO OPTIMIZE DATA
Truncate the table
SQL> truncate table MONOWAR.FA_SALES;
Table truncated.
SQL> select count (*) from MONOWAR.FA_SALES;
COUNT(*)
---------0
Check data on flashback archive
-------------------------------SQL> select count (*) from MONOWAR.SYS_FBA_HIST_110567;
COUNT(*)](https://image.slidesharecdn.com/temporalvalidity-131101072346-phpapp02/85/12c-Database-TEMPORAL-VALIDITY-FLASHBACK-ARCHIVE-Testing-5-320.jpg)
12c Database TEMPORAL VALIDITY & FLASHBACK ARCHIVE Testing
- 1. ----------------------------------------TEMPORAL VALIDITY Testing ---------------------------------------The Temporal Validity feature is relate to valid time dimension for a table via PERIOD FOR clause which adds a time dimension to each row in the table consisting of two date-time columns to indicate validity of data. By this feature we can hidden data that is no longer valid or (inactive) or old from queries. This is an addition over timestamp columns in table for potential future requirements base on time range. SQL> connect monowar/password Connected. SQL> select table_name from user_tables; TABLE_NAME -------------------------------------------------------------------------------TEST_ARCH CP_TEST_ARCH TV_EMP TEST_TV SQL> desc TEST_TV Name Null? Type ----------------------------------------- -------- ---------------------------EMPNO NUMBER(4) ENAME VARCHAR2(10) JOB VARCHAR2(9) MGR NUMBER(4) HIREDATE DATE SAL NUMBER(7,2) COMM NUMBER(7,2) DEPTNO NUMBER(2) SQL> select count (*) from TEST_TV; COUNT(*) ---------14 SQL> alter table TEST_TV add period for recoder_time; Table altered. SQL> desc TEST_TV Name Null? Type ----------------------------------------- -------- ---------------------------EMPNO NUMBER(4) ENAME VARCHAR2(10) JOB VARCHAR2(9) MGR NUMBER(4) HIREDATE DATE SAL NUMBER(7,2) COMM NUMBER(7,2) DEPTNO NUMBER(2) SQL> select table_name, column_name 2 from dba_tab_cols 3 where owner='MONOWAR' and table_name='TEST_TV'; TABLE_NAME COLUMN_NAME -------------------------------------------------------------------------------TEST_TV EMPNO TEST_TV ENAME TEST_TV JOB TEST_TV TEST_TV TEST_TV TEST_TV TEST_TV TEST_TV TEST_TV TEST_TV MGR HIREDATE SAL COMM DEPTNO RECODER_TIME_START RECODER_TIME_END RECODER_TIME
- 2. 11 rows selected. SQL> select column_name,data_type from user_tab_cols where table_name='TEST_TV' and hidden_column='YES'; COLUMN_NAME DATA_TYPE -------------------------------------------------------------------------------RECODER_TIME_START TIMESTAMP(6) WITH TIME ZONE RECODER_TIME_END TIMESTAMP(6) WITH TIME ZONE RECODER_TIME NUMBER We can use PERIOD FOR clause or use the DBMS_FLASHBACK_ARCHIVE procedure with the SELECT statement to filter on valid-time columns . Testing with PERIOD FOR +++++++++++++++++++++++ SQL> connect monowar/password Connected. SQL> show user; USER is "MONOWAR" SQL> create table TV_EMP ( 2 EMPNO NUMBER(7), 3 FULLNAME VARCHAR2(80), 4 USER_TIME_START DATE, 5 USER_TIME_END DATE, 6 PERIOD FOR USER_TIME (USER_TIME_START,USER_TIME_END)); Table created. Check that implicit constraint has been created with valid-time dimension ------------------------------------------------------------------------SQL> select CONSTRAINT_NAME CN, CONSTRAINT_TYPE CT,GENERATED, VALIDATED from dba_constraints where table_name='TV_EMP'; CN CT GENERATED VALIDATED - -------------- --------------------------USER_TIME34EC4D C USER NAME VALIDATED SQL> insert into tv_emp 2 values (301,'EAMMON',to_date('27-JAN-2011','dd-mon-yyyy'), 3 to_date('31-JUL-2013','dd-mon-yyyy')); 1 row created. SQL> commit; Commit complete. SQL> select table_name, column_name from dba_tab_cols where owner='MONOWAR' and table_name='TV_EMP'; TABLE_NAME COLUMN_NAME -----------------------------------TV_EMP USER_TIME TV_EMP EMPNO TV_EMP FULLNAME TV_EMP USER_TIME_START TV_EMP USER_TIME_END Diassociate the columns of valid-time dimension -------------------------------------------------------------SQL> alter table TV_EMP DROP (period for user_time); Table altered. SQL> select table_name, column_name 2 from dba_tab_cols 3 where owner='MONOWAR' and table_name='TV_EMP';
- 3. TABLE_NAME COLUMN_NAME -------------------------------------------------------------------------------TV_EMP EMPNO TV_EMP FULLNAME TV_EMP USER_TIME_START TV_EMP USER_TIME_END Constraint Check ----------------SQL> select CONSTRAINT_NAME CN, CONSTRAINT_TYPE CT,GENERATED, VALIDATED from dba_constraints where table_name='TV_EMP'; no rows selected Create a new valid-time diemnsion without column names (USER_TIME_START,USER_TIME_END) SQL> alter table TV_EMP add period for valid_time; Table altered. SQL> desc TV_EMP Name Null? Type ----------------------------------------- -------- ---------------------------EMPNO NUMBER(7) FULLNAME VARCHAR2(80) USER_TIME_START DATE USER_TIME_END DATE Note: USER_TIME_START,USER_TIME_END are still there as part of user's definition of the table. Check the table columns -------------------------------SQL> select table_name, column_name 2 from dba_tab_cols 3 where owner='MONOWAR' and table_name='TV_EMP'; TABLE_NAME COLUMN_NAME -------------------------------------------------------------------------------TV_EMP VALID_TIME_START TV_EMP EMPNO TV_EMP FULLNAME TV_EMP USER_TIME_START TV_EMP USER_TIME_END TV_EMP VALID_TIME_END TV_EMP VALID_TIME 7 rows selected. Testing with DBMS_FLASHBACK_ARCHIVE +++++++++++++++++++++++++++++++++++++ The DBMS_FLASHBACK_ARCHIVE package to set the time visibility of the data for a given period of time or data which is currently valid within the valid time period at the session level. For testing with very minimum data, I have created a TEST_TV based on SCOTT.emp table. SQL> update TEST_TV set RECODER_TIME_START=SYSDATE; 14 rows updated. SQL> update TEST_TV set RECODER_TIME_END=SYSDATE where HIREDATE >'23-JAN-82'; 2 rows updated. SQL> EXECUTE DBMS_FLASHBACK_ARCHIVE.enable_at_valid_time('CURRENT'); PL/SQL procedure successfully completed.
- 4. So now when we do a count(*) from the table TEST_TV, it only returns the rows which we have deemed to be active or current and not all the rows (here 12/14). SQL> select count(*) from TEST_TV; COUNT(*) ---------12 I am going to extent the time period for more rows NOTE: SQL> update TEST_TV set RECODER_TIME_END=SYSDATE where HIREDATE <'23-JAN-82'; update TEST_TV set RECODER_TIME_END=SYSDATE where HIREDATE <'23-JAN-82' * ERROR at line 1: ORA-00904: "RECODER_TIME_END": invalid identifier SQL> EXECUTE DBMS_FLASHBACK_ARCHIVE.enable_at_valid_time('CURRENT'); PL/SQL procedure successfully completed. SQL> update TEST_TV set RECODER_TIME_END=SYSDATE where HIREDATE >'28-SEP-81'; update TEST_TV set RECODER_TIME_END=SYSDATE where HIREDATE >'28-SEP-81' * ERROR at line 1: ORA-00904: "RECODER_TIME_END": invalid identifier Now set the visibility of the temporal data to the full table and update: SQL> EXECUTE DBMS_FLASHBACK_ARCHIVE.enable_at_valid_time('ALL'); PL/SQL procedure successfully completed. SQL> update TEST_TV set RECODER_TIME_END=SYSDATE where HIREDATE >'28-SEP-81'; 6 rows updated. SQL> EXECUTE DBMS_FLASHBACK_ARCHIVE.enable_at_valid_time('CURRENT'); PL/SQL procedure successfully completed. SQL> select count(*) from TEST_TV; COUNT(*) ---------8 This time select statement is getting less number (8) of rows than last time (12). Put it back normal state -----------------------------SQL> EXECUTE DBMS_FLASHBACK_ARCHIVE.enable_at_valid_time('ALL'); PL/SQL procedure successfully completed. SQL> select count(*) from TEST_TV; COUNT(*) ---------14 ++++++++++++++++++++++++++ FLASHBACK ARCHIVE ++++++++++++++++++++++++++ SQL> alter database datafile '/BPELAIT2/MONDB01/MONDB01/test_arch01.dbf' resize 500M; Database altered. SQL> connect monowar/password Connected.
- 5. SQL> create table FA_sales as select * from sh.sales; Table created. SQL> create Flashback Archive test_nfaopt tablespace TEST_ARCH RETENTION 10 DAY NO OPTIMIZE DATA; Flashback archive created. [Ref: http://docs.oracle.com/cd/E16655_01/server.121/e17209/statements_5011.htm] SQL> alter table FA_sales flashback archive test_nfaopt; Table altered. Set the context level collection for FA_sales table -----------------------------------------------SQL> exec dbms_flashback_archive.set_context_level('TYPICAL'); PL/SQL procedure successfully completed. Make some update on Flashback table from other schema ----------------------------------------------------SQL> conn sh/sh Connected. SQL> update monowar.FA_sales set CUST_ID=3333 where CUST_ID=8865; 243 rows updated. SQL> commit; Commit complete. Check the flashback table status ---------------------------------------SQL> select * from dba_flashback_archive_tables; TABLE_NAME -------------------------------------------------------------------------------OWNER_NAME -------------------------------------------------------------------------------FLASHBACK_ARCHIVE_NAME -------------------------------------------------------------------------------ARCHIVE_TABLE_NAME STATUS ----------------------------------------------------- ------------FA_SALES MONOWAR TEST_NFAOPT SYS_FBA_HIST_110567 ENABLED --- NOTE: DBA_FLASHBACK_ARCHIVE_TABLES for NO OPTIMIZE DATA Truncate the table SQL> truncate table MONOWAR.FA_SALES; Table truncated. SQL> select count (*) from MONOWAR.FA_SALES; COUNT(*) ---------0 Check data on flashback archive -------------------------------SQL> select count (*) from MONOWAR.SYS_FBA_HIST_110567; COUNT(*)
- 6. ---------919086 Retrieve the Transaction ID from flashback archive table ------------------------------------------------------SQL> select distinct XID from monowar.SYS_FBA_HIST_110567; XID ---------------0004001500000A16 select DBMS_flashback_archive.Get_sys_context ('0004001500000A16','USERENV','SESSION_USER') as SUSPECTUSR From MONOWAR.FA_SALES versions between scn minvalue and maxvalue where num=1; SQL> select DBMS_flashback_archive.Get_sys_context 2 ('0004001500000A16','USERENV','SESSION_USER') as SUSPECTUSR 3 ,versions_XID,VERSIONS_starttime,versions_endtime 4 From MONOWAR.FA_SALES 5 versions between scn minvalue and maxvalue SUSPECTUSR VERSIONS_XID VERSIONS_STARTTIME VERSIONS_ENDTIME --------------------------------------------------------------------------SH 01-NOV-13 04.05.56.000000000 PM CLEAN UP --------------SQL> alter table MONOWAR.FA_SALES NO flashback archive; Table altered. SQL> drop flashback archive test_nfaopt; Flashback archive dropped.