oracle中的庞大数据库

Question

I had about 20,000,000 records in a table (random data), and then I added empty column to that table... but when I update that table to fill that column, the process was broken down.. I tried to use the cursor and the index but no results.. do you have any fast solution or any alternative solution?

Thank you in advance :)

Answer 1

Maybe the fastest way would be to create new_table as select * from existing table, and then inside the select statment of CTAS, calculate the value of the new column. After that, you can rename old table to something like table_bckp, then rename new table to the original table name, and then apply constraints, indexes, and other scripts previously saved from old table definitions.