topic Re: database input NB_LINE variable is always 'int'. Does it work when the table has 3 billion rows? in Talend Studio

database input NB_LINE variable is always 'int'. Does it work when the table has 3 billion rows?

akakuman — Sun, 21 May 2017 19:11:25 GMT

I am designing a job that exports rows from a informix table.

Lets say i am selecting from an informix table with 3 billion rows. The variable tInformixInput_1_NB_LINE is declared as int type.

The component will fail when total number of rows selected gets beyond the integer range. What are the design considerations for this scenario?

Re: database input NB_LINE variable is always 'int'. Does it work when the table has 3 billion rows?

vapukov — Sun, 21 May 2017 22:16:07 GMT

if it just theoretic question, the answer - do not know, need test.

but if it practical question - if any ETL process, excluding initial loading, have regular input for billions of rows ... it look like something wrong in process design.

In any case You always can count records by other methods.

Re: database input NB_LINE variable is always 'int'. Does it work when the table has 3 billion rows?

akakuman — Mon, 22 May 2017 09:55:10 GMT

Thanks for your reply and I completely agree with you.

Theoretically, what are my options if I need to initially load more than 3 billion rows from DB2/zos database using talend?

I can only think of doing it in batches, i.e split the primary key range to manageable chunks and load the data.

Re: database input NB_LINE variable is always 'int'. Does it work when the table has 3 billion rows?

vapukov — Mon, 22 May 2017 12:59:05 GMT

by the many reasons - the best choice for huge database will be avoiding direct loading whole table in 1 step

Technics could be different, all depends from real tasks and could be adjusted