MYSQL PROBLEM REGARDING TABLE JOIN

i have a problem regarding mysql.when i join 2 tables in my mysql database it doesn't display the result.these 2 tables in my databases have very big data inside.

the result doesn't display due to the big data in my tables?

how can i solve this problem?

is there any solution regarding this problem?

exactly how big is this data, it seems unlikly, but its possible that the data is so incredably large, and the RAM/swap cannot hnelde it, refusing to merge.....