Procedure Freezing Sometimes

Hi All,

  I have a procedure with a complex SQL Script, It takes about 20 seconds to run. But sometimes the execution freeze and I have to cancel an run again. Sometimes the execution take about 2 minutes or more.

I had to put it in a procedure because the procedure generate 3 tables and the calculation of these tables are dependents, I have to calculate Table 1 to use in calculation of table 2 and table 3.

Is there a way to find why it's freezing sometimes? If it's cause by my procedure or it's on Hana server?

Thanks you.