When i am connect database through toad,one error occured. ORA-12514: TNS:listener does not currently know of service requested in connect descriptor. plz help me thanks advance.............

2857

ORA-26028: index string.string initially in unusable state

3912

ORA-16627: No standby databases support the overall protection mode.

4036

ORA-26030: index string.string had string partitions made unusable due to:

1986

ORA-16516: The current state is invalid for the attempted operation.

8875

RMAN-05017: no copy of datafile number found to recover

2465

IMP-00096: Warning: Skipping table "string"."string" because type synonym "string"."string" cannot be created

1665

ORA-26079: file "string" is not part of table string.string

1998

ORA-26027: unique index string.string partition string initially in unusable state

6790

IMG-02003: 2FF03 - incorrect color histogram feature specification

1760

IMP-00060: Warning: Skipping table "string"."string" because object type "string"."string" does not exist or has different identifier

3224

NZE-28890: Entrust Login Failed

1921

IMP-00070: Lob definitions in dump file are inconsistent with database.

1796

ORA-26094: stream format error: input column overflow

2854

ORA-26095: unprocessed stream data exists

3638