oracle - Error ORA-01821 "date format not recognized" -

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i trying alter session date format "yyyy-mm-dd hh:mi:ss:ff6"

alter session set nls_date_format = 'yyyy-mm-dd hh:mi:ss:ff6'

is i'm trying use , it's giving me error ora-01821 "date format not recognized".

what doing wrong?

the oracle date type has second-level precision (as opposed to, say, microsecond-level precision), date formats don't support ff notation. if want microseconds appended, can write:

alter session set nls_date_format = 'yyyy-mm-dd hh:mi:ss:"000000"';

alternatively, maybe wanted set default timestamp format? if so:

alter session set nls_timestamp_format = 'yyyy-mm-dd hh:mi:ss:ff6';

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