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Why do I have ORA-00904 even when the column is present? ORA-00904-invalid identifier errors are frequently caused by case-sensitivity issues Normally, Oracle tables and columns are not case sensitive and cannot contain punctuation marks and spaces But if you use double quotes to create a quoted identifier, that identifier must always be referenced with double quotes and with the correct case For example: create table bad_design
sql - ORA-12560: TNS:protocol adaptor error - Stack Overflow -2 In my case, (ORA-12560: TNS protocol adapter error)Issue cause of database connection issue like database, user name and password Once you got the issue Initially you have to check connection details, after check the oracle service and further more
sql - ORA-00904: invalid identifier - Stack Overflow More informations about your ERROR ORA-00904: string: invalid identifier Cause: The column name entered is either missing or invalid Action: Enter a valid column name A valid column name must begin with a letter, be less than or equal to 30 characters, and consist of only alphanumeric characters and the special characters $, _, and #
ORA-01452: cannot CREATE UNIQUE INDEX; duplicate keys found If you had two identical values in the table - abcd twice, say, with the same case - then your ALTER TABLE would throw ORA-02299 despite the NOVALIDATE, as it won't be able to create the unique index to back that up In 11g you could create a virtual column and constrain that, but you have the same problem creating the unique index
ORA-03113: end-of-file on communication channel after long inactivity . . . 19 ORA-03113: end-of-file on communication channel Is the database letting you know that the network connection is no more This could be because: A network issue - faulty connection, or firewall issue The server process on the database that is servicing you died unexpectedly For 1) (firewall) search tahiti oracle com for SQLNET EXPIRE_TIME
ORA-30926: unable to get a stable set of rows in the source tables ORA-30926: unable to get a stable set of rows in the source tables Cause: A stable set of rows could not be got because of large dml activity or a non-deterministic where clause The merge was part of a larger batch, and was executed on a live database with many concurrent users There was no need to change the statement
ORA-32795: cannot insert into a generated always identity column One of the columns in your target table (leaves_approval) contains an identity column that was defined as Generated always Identity columns can be created in 2 modes - Generated always, that cannot be assigned and Generated by default that can be assigned