ABAP runtime errors

Hi,

When I run a z transaction it gives the following error.

"ABAP runtime errors

Each transaction requires some main memory space to process application data. If the operating system cannot provide any more space, the transaction is terminated."

The program contains two SELECT queries .The first SELECT statement retrieves 700000 entries . In the next SELECT

statement I am using for all entries of the previous table.

Please help me how to solve this issue.

Thanks,

Amit