By comparing the CLOB

Hi all

I have a table with a CLOB (gene sequence) field. When I do an insert, I want to make sure that sequence does not already exist in the table. The table will be ~ 100,000 records. An idea of the best way to handle this? A DBMS CLOB comparison function will be the best way?

Any help is appreciated more.

I don't think you want to compare 100 000 time very CLOB, you insert a row.

The simple solution is to calculate a hash of the CLOB object and index. Two CLOB that are the same will have the same hash, but there is a small chance that two different CLOB will have the same hash. Therefore, you must check if there is a line with the hash already present before inserting it. Just compare the CLOB, if find you one with the same hash.

DBMS_CRYPTO. HASH() will make the hash for you. You can test how fast various types of hash are and choose the fastest.

-Phil

Tags: Database

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