postgresql where are temp files stored

Question

Once the work_mem , temp_buffer or maintenence_work_mem is full where does the PostgreSQL writes to the disk, what is the location of temporary files by default

Answer 1

Quote from the manual

Temporary files (for operations such as sorting more data than can fit in memory) are created within PGDATA/base/pgsql_tmp, or within a pgsql_tmp subdirectory of a tablespace directory if a tablespace other than pg_default is specified for them. The name of a temporary file has the form pgsql_tmpPPP.NNN, where PPP is the PID of the owning backend and NNN distinguishes different temporary files of that backend