Create Procedures

handreeck — Sat, 30 Aug 2008 10:06:59 +0000

create procedure set_death_age(poet VARCHAR2, poet_age NUMBER)
poet_id NUMBER;
begin
SELECT id INTO poet_id FROM poets WHERE name = poet;
INSERT INTO deaths (mort_id, age) VALUES (poet_id, poet_age);
end set_death_age;

regular table to partition table

richlai — Sat, 30 Aug 2008 05:20:30 +0000

Tom,

I have a situation where i need your expertise advice. Our product, at the client site,
creates table and populates data. The table creation happens once in a while depending
upon the client's requirement.

As Oracle releases with a lot of feature in each versions, we would like to make use of
it and convert all regular tables into partitioned tables. We are looking for a various
options, to reduce the downtime, fast migration and with no problems. These regular
tables might be having millions rows. The following information might give a better idea,
what we have now and what we are looking for...

Existing environment:

App  Ref.  TableName        Structure
ID
-----------------------------------------
1     1    TABLE_1
1     2    TABLE_2          Same as TABLE_1
1     3    TABLE_3          Same as TABLE_1
1     4    TABLE_4
1     5    TABLE_5          Same as TABLE_4
1     6    TABLE_6          Same as TABLE_4
1     7    TABLE_7          Same as TABLE_4
1     8    TABLE_8          Same as TABLE_4
1     9    TABLE_9
1     10   TABLE_10         Same as TABLE_1
1     11   TABLE_11         Same as TABLE_1
1     12   TABLE_12
..    ...  ...
..    ...  ...
..    ...  ...
..    ...  ...

As you may have noticed several tables have the same structure of the previous or old
tables. Now, we wanted have partitioned tables as follows...

Need to be converted as:

App  Ref.   TableName       Comments
ID
------------------------------------------------------------------
1     1     TABLE_1         will also be having TABLE_2, TABLE_3,
                            TABLE_10 & TABLE_11 data
1     4     TABLE_4         will also be having TABLE_5, TABLE_6,
                            TABLE_7 & TABLE_8 data
1     12    TABLE_12        only its data

My questions are,
1. How do we convert all regular tables into partitioned tables. Hints are basic steps
would do fine.
2. We are using one of the date columns as a partition key. What would be the fastest and
safest method to migrate.

thanks,
senthil

and we said...

pretend t1, t2, t3 are your existing tables.
T is the table you want (you can drop t1 and rename t to t1 later if you need)

Then, use the following approach:

ops$tkyte@ORA817DEV.US.ORACLE.COM> create table t1 as select sysdate dt, all_objects.*
from all_objects;

Table created.

ops$tkyte@ORA817DEV.US.ORACLE.COM> create table t2 as select add_months(sysdate,-12) dt,
all_objects.* from all_objects;

Table created.

ops$tkyte@ORA817DEV.US.ORACLE.COM> create table t3 as select add_months(sysdate,-24) dt,
all_objects.* from all_objects;

Table created.

ops$tkyte@ORA817DEV.US.ORACLE.COM>
ops$tkyte@ORA817DEV.US.ORACLE.COM>
ops$tkyte@ORA817DEV.US.ORACLE.COM> create table t( dt, OWNER, OBJECT_NAME,
SUBOBJECT_NAME,
  2   OBJECT_ID, DATA_OBJECT_ID, OBJECT_TYPE, CREATED,
  3   LAST_DDL_TIME, TIMESTAMP, STATUS, TEMPORARY,
  4   GENERATED, SECONDARY )
  5  partition by range(dt) (
  6  partition part2000 values less than ( to_date( '01-jan-2001', 'dd-mon-yyyy') ),
  7  partition part2001 values less than ( to_date( '01-jan-2002', 'dd-mon-yyyy') ),
  8  partition part2002 values less than ( to_date( '01-jan-2003', 'dd-mon-yyyy') )
  9  )
 10  as
 11  select sysdate dt, all_objects.* from all_objects where 1=0;

Table created.

just create an empty partitioned table, partitioned by date.  The ranges are such that
t1 fits in one partition, t2 in another and so on

ops$tkyte@ORA817DEV.US.ORACLE.COM>
ops$tkyte@ORA817DEV.US.ORACLE.COM> alter table t
  2  exchange partition part2000
  3  with table t3
  4  without validation
  5  /

Table altered.

ops$tkyte@ORA817DEV.US.ORACLE.COM> alter table t
  2  exchange partition part2001
  3  with table t2
  4  without validation
  5  /

Table altered.

ops$tkyte@ORA817DEV.US.ORACLE.COM> alter table t
  2  exchange partition part2002
  3  with table t1
  4  without validation
  5  /

Table altered.

ops$tkyte@ORA817DEV.US.ORACLE.COM> select count(*) from t;

  COUNT(*)
----------
     70848

ops$tkyte@ORA817DEV.US.ORACLE.COM> select count(*) from t1;

  COUNT(*)
----------
         0

Now, T is a table with partitions formally known as tables T1, T2, T3!

oracle « WordPress.com Tag Feed

Create Procedures

regular table to partition table

and we said...