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You might wonder what would happen if the column used to determine the partition is modified in any of the preceding partitioning schemes. There are two cases to consider: The modification would not cause a different partition to be used; the row would still belong in this partition. This is supported in all cases. The modification would cause the row to move across partitions. This is supported if row movement is enabled for the table; otherwise, an error will be raised.
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We can observe these behaviors easily. In the previous example, we inserted a pair of rows into PART_1 of the RANGE_EXAMPLE table: ops$tkyte%ORA11GR2> CREATE TABLE range_example 2 ( range_key_column date , 3 data varchar2(20) 4 ) 5 PARTITION BY RANGE (range_key_column) 6 ( PARTITION part_1 VALUES LESS THAN 7 (to_date('01/01/2010','dd/mm/yyyy')), 8 PARTITION part_2 VALUES LESS THAN 9 (to_date('01/01/2011','dd/mm/yyyy')) 10 ) 11 / Table created. ops$tkyte%ORA11GR2> insert into range_example 2 ( range_key_column, data ) 3 values 4 ( to_date( '15-dec-2009 00:00:00', 5 'dd-mon-yyyy hh24:mi:ss' ), 6 'application data...' ); 1 row created. ops$tkyte%ORA11GR2> insert into range_example 2 ( range_key_column, data ) 3 values
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CHAPTER 13 PARTITIONING
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4 ( to_date( '01-jan-2010 00:00:00', 5 'dd-mon-yyyy hh24:mi:ss' )-1/24/60/60, 6 'application data...' ); 1 row created. ops$tkyte%ORA11GR2> select * from range_example partition(part_1); RANGE_KEY --------15-DEC-09 31-DEC-09 DATA -------------------application data... application data...
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We take one of the rows and update the value in its RANGE_KEY_COLUMN such that it can remain in PART_1: ops$tkyte%ORA11GR2> update range_example 2 set range_key_column = trunc(range_key_column) 3 where range_key_column = 4 to_date( '31-dec-2009 23:59:59', 5 'dd-mon-yyyy hh24:mi:ss' ); 1 row updated. As expected, this succeeds: the row remains in partition PART_1. Next, we update the RANGE_KEY_COLUMN to a value that would cause it to belong in PART_2: ops$tkyte%ORA11GR2> update range_example 2 set range_key_column = to_date('01-jan-2010','dd-mon-yyyy') 3 where range_key_column = to_date('31-dec-2009','dd-mon-yyyy'); update range_example * ERROR at line 1: ORA-14402: updating partition key column would cause a partition change This immediately raises an error since we did not explicitly enable row movement. In Oracle8i and later releases, we can enable row movement on this table to allow the row to move from partition to partition.
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Note The row movement functionality is not available on Oracle 8.0; you must delete the row and reinsert it in
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You should be aware of a subtle side effect of doing this, however; namely that the ROWID of a row will change as the result of the update: ops$tkyte%ORA11GR2> select rowid 2 from range_example 3 where range_key_column = to_date('31-dec-2009','dd-mon-yyyy');
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CHAPTER 13 PARTITIONING
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ROWID -----------------AAAXqPAAEAAATC9AAB ops$tkyte%ORA11GR2> alter table range_example 2 enable row movement; Table altered. ops$tkyte%ORA11GR2> update range_example 2 set range_key_column = to_date('01-jan-2010','dd-mon-yyyy') 3 where range_key_column = to_date('31-dec-2009','dd-mon-yyyy'); 1 row updated. ops$tkyte%ORA11GR2> select rowid 2 from range_example 3 where range_key_column = to_date('01-jan-2010','dd-mon-yyyy'); ROWID -----------------AAAXqQAAEAAATDFAAA As long as you understand that the ROWID of the row will change on this update, enabling row movement will allow you to update partition keys.
Note There are other cases where a ROWID can change as a result of an update. It can happen as a result of an
update to the primary key of an IOT. The universal ROWID will change for that row, too. The Oracle 10g and above FLASHBACK TABLE command may also change the ROWID of rows, as might the Oracle 10g and above ALTER TABLE SHRINK command.
You need to understand that, internally, row movement is done as if you had, in fact, deleted the row and reinserted it. It will update every single index on this table, and delete the old entry and insert a new one. It will do the physical work of a DELETE plus an INSERT. However, it is considered an update by Oracle even though it physically deletes and inserts the row therefore, it won t cause INSERT and DELETE triggers to fire, just the UPDATE triggers. Additionally, child tables that might prevent a DELETE due to a foreign key constraint won t. You do have to be prepared, however, for the extra work that will be performed; it is much more expensive than a normal UPDATE. Therefore, it would be a bad design decision to construct a system whereby the partition key was modified frequently and that modification would cause a partition movement.
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