Compress Historical Interval Partitions

There is a requirement to compress monthly interval partition older that 36 months.

First, interval partitions were renamed to more intuitive names using Renaming Interval Partitions

Even though the rename is not necessary, it does provide more clarity.

There is a demo to find and compress partitions older that 36 months.

SQL> @ partition_interval_delta.sql
SQL> select
  2  partition_name, compression, high_value,
  3  TRUNC(MONTHS_BETWEEN(SYSDATE,(TO_DATE(regexp_substr(partition_name, '[[:digit:]]+'),'YYYYMM')))) months_delta
  4  from dba_tab_partitions
  5  where table_owner = UPPER('&owner')
  6  and table_name = UPPER('&table')
  7  and compression='DISABLED'
  8  and TRUNC(MONTHS_BETWEEN(SYSDATE,(TO_DATE(regexp_substr(partition_name, '[[:digit:]]+'),'YYYYMM')))) >= &months_delta
  9  order by 1
 10  ;
Enter value for owner: app
Enter value for table: interval
Enter value for months_delta: 36

PARTITION_NAME        COMPRESS HIGH_VALUE                                               MONTHS_DELTA
--------------------- -------- -------------------------------------------------------- ------------
P201702               DISABLED TO_DATE(' 2017-03-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           49
P201705               DISABLED TO_DATE(' 2017-06-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           46
P201706               DISABLED TO_DATE(' 2017-07-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           45
P201707               DISABLED TO_DATE(' 2017-08-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           44
P201708               DISABLED TO_DATE(' 2017-09-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           43
P201709               DISABLED TO_DATE(' 2017-10-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           42
P201710               DISABLED TO_DATE(' 2017-11-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           41
P201711               DISABLED TO_DATE(' 2017-12-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           40
P201712               DISABLED TO_DATE(' 2018-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           39
P201801               DISABLED TO_DATE(' 2018-02-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           38
P201802               DISABLED TO_DATE(' 2018-03-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           37
P201803               DISABLED TO_DATE(' 2018-04-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           36
SQL> 
SQL> set echo off

SQL> set verify on
SQL> define partition_name = P201702
SQL> alter table APP.INTERVAL modify partition &partition_name compress for OLTP;
old   1: alter table APP.INTERVAL modify partition &partition_name compress for OLTP
new   1: alter table APP.INTERVAL modify partition P201702 compress for OLTP

SQL> alter table APP.INTERVAL move partition &partition_name ONLINE UPDATE INDEXES PARALLEL 8;
old   1: alter table APP.INTERVAL move partition &partition_name ONLINE UPDATE INDEXES PARALLEL 8
new   1: alter table APP.INTERVAL move partition P201702 ONLINE UPDATE INDEXES PARALLEL 8

SQL> define partition_name = P201705
SQL> alter table APP.INTERVAL modify partition &partition_name compress for OLTP;
old   1: alter table APP.INTERVAL modify partition &partition_name compress for OLTP
new   1: alter table APP.INTERVAL modify partition P201705 compress for OLTP

SQL> alter table APP.INTERVAL move partition &partition_name ONLINE UPDATE INDEXES PARALLEL 8;
old   1: alter table APP.INTERVAL move partition &partition_name ONLINE UPDATE INDEXES PARALLEL 8
new   1: alter table APP.INTERVAL move partition P201705 ONLINE UPDATE INDEXES PARALLEL 8

SQL> @ partition_interval_delta.sql
SQL> select
  2  partition_name, compression, high_value,
  3  TRUNC(MONTHS_BETWEEN(SYSDATE,(TO_DATE(regexp_substr(partition_name, '[[:digit:]]+'),'YYYYMM')))) months_delta
  4  from dba_tab_partitions
  5  where table_owner = UPPER('&owner')
  6  and table_name = UPPER('&table')
  7  and compression='DISABLED'
  8  and TRUNC(MONTHS_BETWEEN(SYSDATE,(TO_DATE(regexp_substr(partition_name, '[[:digit:]]+'),'YYYYMM')))) >= &months_delta
  9  order by 1
 10  ;
Enter value for owner: app
Enter value for table: interval
Enter value for months_delta: 36

PARTITION_NAME        COMPRESS HIGH_VALUE                                               MONTHS_DELTA
--------------------- -------- -------------------------------------------------------- ------------
P201706               DISABLED TO_DATE(' 2017-07-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           45
P201707               DISABLED TO_DATE(' 2017-08-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           44
P201708               DISABLED TO_DATE(' 2017-09-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           43
P201709               DISABLED TO_DATE(' 2017-10-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           42
P201710               DISABLED TO_DATE(' 2017-11-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           41
P201711               DISABLED TO_DATE(' 2017-12-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           40
P201712               DISABLED TO_DATE(' 2018-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           39
P201801               DISABLED TO_DATE(' 2018-02-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           38
P201802               DISABLED TO_DATE(' 2018-03-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           37
P201803               DISABLED TO_DATE(' 2018-04-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS'           36
SQL> set echo off