Code for Garbage collection?

 
Is there really some code from MQL4/MQL5 can trigger garbage collection?

As I observed from time to time, MT4/MT5 will reduce their RAM usage every 15 or 30 minutes, but wondering is there a method to manually trigger this event.
 
Yu Pang Chan: Is there really some code from MQL4/MQL5 can trigger garbage collection? As I observed from time to time, MT4/MT5 will reduce their RAM usage every 15 or 30 minutes, but wondering is there a method to manually trigger this event.
No, not according to documentation.