Swap partition after the derivation of a field value

Hello gurus

There is a table that currently contains records 4billion. In this table, there is an obligation to fill a new column that is currently empty. The logic to fill the column based on the value of another column and using substr/instr, we can calculate the value to be entered in the new column. Meaningful to shoot is not a problem. This existing table in which I want to fill the new field is partitioned. Now, since its seen record 4billion and its partitioned and Yes its compressed as a result, I don't mean to update the table of origin rather go for Exchange of partitioning.

One would be a pseudo-code or flow for the same. I think so

1. create a temporary table that held all the records of 4 b of the table in its population and origin derive the logic of the new field.

2. once the temporary table is populated, use exchange notion of partitioning to transfer the data from the temporary table to the original table.

Please confirm my understanding and if possible any pseduocode to reproduce this scenario will be very useful.

Thank you very much

To use the exchange concept, you do partitioning wise partition (a bit like the pseudocode below):

create the table exchange_table as

Select c_1, c_2,... out

Since the partition of big_table (some_partition)

where 1 = 2;

for x in (select nom_partition from user_tab_partitions where table_name = "BIG_TABLE")

loop


run immediately "insert into exchange_table" |

"Select c_1, c_2,..., c_k,..., substr (c_k, instr (c_k,...),...). René,... out ' |

«partition big_table (' |)» x.partition_name | ') ';


run immediately 'alter partition change table big_table' | x. nom_partition | "with table exchange_table;


run immediately 'truncate table exchange_table;


end loop;

Concerning

Etbin

Tags: Database

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