ORA-04036: PGA Memory Used By The Instance Exceeds PGA_AGGREGATE_LIMIT

Solution : First thing you need to check , why the session is using lot of PGA. Then follow any of the below.

Set PGA_AGGREGATE_LIMIT to 0 , which removes the limit on PGA usage per session.
```
alter system set pga_aggregate_limit=0 scope=both;
```
Else increase the size of PGA_AGGREGATE_LIMIT to a higher value.
```
alter system set pga_aggregate_limit=3072M scope=both;
```