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I create a backup file of postgeSQL database:
>pg_dump --dbname=db_test --host=localhost --username=user -F c -f dump_test.out
In documentation for pg_dump is used extension .sql and for pg_dumpall is used .out
What is the differences between the extensions of .out and .sql in pg_dump in PostgreSQL? what is the recommendation and why?
Actually in these examples the used extensions don't really matter: both exports are plain text (i.e SQL) scripts. You decide which extension to use: if you export in plain SQL it's better to use .sql extension but you can choose another one.
In general you decide which extension you use. Neither psql nor pg_restore have a mandatory extension for the export file. If you use another output file format (-Fc or -Ft) for pg_dump it's better to use another extension than .sql to remember which export format has been used.
