Droping partitions at once

Question

ALTER TABLE table_name DROP PARTITION (partition_1000);
ALTER TABLE table_name DROP PARTITION (partition_1001);
ALTER TABLE table_name DROP PARTITION(partition_1320);(b
it is a delta partition,so trying to remove 320 partitions at once in pl/sql developer for a single table.
Like this i have to remove for more then 15 tables one by one, will this effect the database like filling up the archinve log destination by writing more logs.
please advice me the kind of problems that i am going to face , as i am doing it on the production box directly.

Answer 1

Hi Praveen,
here are some code samples that we have used few years back, you might change logic.....but atleaset you go some logic from this..
   CURSOR c_part (start_mmdd VARCHAR2, end_mmdd VARCHAR2)
    IS
      SELECT   partition_name, high_value
          FROM user_tab_partitions
         WHERE partition_name BETWEEN 'xyz_' || start_mmdd   AND 'xyz_' || end_mmdd
           AND table_name = 'ABCD'
      ORDER BY partition_name;
  TYPE va_part_name IS TABLE OF VARCHAR2 (9)
      INDEX BY BINARY_INTEGER;   
         v_part_nm   va_part_name;
PROCEDURE drop_partition (p_table_name IN VARCHAR2)
   IS
   BEGIN
      FOR i IN  v_part_nm.FIRST ..  v_part_nm.LAST
      LOOP
         EXECUTE IMMEDIATE    'ALTER TABLE '                     || p_table_name                 || 'DROP PARTITION '     ||  v_part_nm (i);
      END LOOP;
   END drop_partition;
   PROCEDURE Create_Partition (p_date IN DATE, p_table_name IN VARCHAR2)
   IS
      v_temp_start_mmdd   VARCHAR2 (4);
      v_pnext             VARCHAR2 (5);                -- Next partition name
      e_table_nt_exist    EXCEPTION;
      PRAGMA EXCEPTION_INIT (e_table_nt_exist, -00942);
      e_table_hgr_bnd     EXCEPTION;
      PRAGMA EXCEPTION_INIT (e_table_hgr_bnd, -14074);
   BEGIN
      IF validate_inputs (p_date, p_table_name) = 0
      THEN
         --Status =0 means, validation of inputs is successful
         -- Creating partition for required month
         v_temp_start_mmdd := v_part_start_mmdd;
         LOOP
            v_pnext :=
                     TO_CHAR (TO_DATE (v_temp_start_mmdd, 'MMDD') + 1,
                              'MMDD');
            IF LENGTH (v_pnext) = 3
            THEN
               v_pnext := '0' || v_pnext;
            END IF;
            -- Create the partitions
            EXECUTE IMMEDIATE    'ALTER TABLE SEBS.'
                              || p_table_name
                              || ' ADD PARTITION xyz_'
                              || v_temp_start_mmdd
                              || ' VALUES LESS THAN (TO_DATE('' '
                              || v_part_year
                              || v_pnext
                              || '  000000'', ''SYYYYMMDD HH24MISS'', ''NLS_CALENDAR=GREGORIAN''))
          TABLESPACE DATA_01
          PCTFREE 10
          PCTUSED 40
          INITRANS 1
          MAXTRANS 255
         /* STORAGE
          INITIAL 100M
          NEXT 50M
          MINEXTENTS 2
          MAXEXTENTS UNLIMITED
          PCTINCREASE 0
            log_read_write (   'Created '
                            || p_table_name
                            || ' partition '
                            || v_temp_start_mmdd
                            || '.'
            v_temp_start_mmdd := v_pnext;
            EXIT WHEN v_temp_start_mmdd > v_part_end_mmdd;
         END LOOP;
         log_read_write (NULL, 1);
      END IF;
   EXCEPTION
      WHEN e_table_nt_exist
      THEN
         log_read_write ('Error! ' || p_table_name || ' ' || SQLERRM, 1);
      WHEN e_table_hgr_bnd
      THEN
         log_read_write ('Error! ' || p_table_name || ' ' || SQLERRM, 1);
      WHEN OTHERS
      THEN
         log_read_write ('Error! ' || SQLERRM, 1);
   END Create_Partition;I have changed my table names, variables etc to generic for security purpose, might be code have some syntax error you can check for that.
This is just for your reference and provide some logic only.
Hope it helps you to some extent.