Size of Temporary tablespace is increasing very much in postgresql 9.1.

Dear expert,

In postgreSQL-9.1,the size of pgsql_tmp inside tablespace (Temp tablespace) is increased by 544G in one day.
However, the DBsize is as usual but tablespace size is getting increased.
Could you please suggest why it is happening ?

Regards,
Dinesh Chandra
|Database administrator (Oracle/PostgreSQL)| Cyient Ltd. Noida.
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