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.............

2797

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

3148

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

1616

NZE-28890: Entrust Login Failed

1868

invalid quantity specification negative quantity are not allowed for this item please check this item definition quantity

3377

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

1703

IMP-00064: Definition of LOB was truncated by export

6409

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

1947

if the lengths of two wires are same and the area of cross sections is 4:7 then what will be the ratio of current passing through these wires

2692

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

3977

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

1741

ORA-26084: direct path context already finished

1944

ORA-26094: stream format error: input column overflow

2792

ORA-26076: cannot set or reset value after direct path structure is allocated

1960

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

1934