I perform on single select count (1) the statement when the data volume is very small (30) can run out as a result, the data of 40 time is not the result, program has been pause in executing SQL,
But if you execute the select * similar operations, that no matter how much data can show as a result, the article
I wondered, log found the log when performing a successful hit Finished task in stage 0.0 2.0 similar log has a lot of, a few when I was stuck,
Everybody encountered such a situation? What is the solution ideas? For help