ORA-01690: sort area size too small

Expdp is failing due to the error ORA-01690: sort area size too small. In my case PGA parameter is not set.
After that started the Full expdp backup, Is failing. Here is the error given below:

ORA-39126: Worker unexpected fatal error in KUPW$WORKER.UNLOAD_METADATA [INDEX_STATISTICS]
ORA-01690: sort area size too small
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 95
ORA-06512: at "SYS.KUPW$WORKER", line 8164

Check the memory componenet in Oracle.

SQL> show parameter sga

NAME         TYPE        VALUE 
-----------  ---------   --------- 
lock_sga     boolean     FALSE 
pre_page_sga boolean     FALSE 
sga_max_size big integer 6528M 
sga_target   big integer 6528M 

SQL> show parameter pga

NAME                  TYPE         VALUE 
--------------------  -----------  --------- 
pga_aggregate_target  big integer  0 

-- IF pga aggregate is zero then check memory parameter
SQL> show parameter memory

NAME                      TYPE         VALUE 
------------------------- -----------  ------- 
hi_shared_memory_address  integer      0 
memory_max_target         big integer  0 
memory_target             big integer  0 
shared_memory_address     integer      0 

2. Set the value of PGA target because memory target or PGA target is not set.

alter system set pga_aggregate_target = 2G scope=spfile;

3. It’s fixed the issue in EXPDP.

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