oracle network error solution

Listing down oracle common network TNS error and solution faced mostly during database administration

You may click on individual ORA- error string to find more details in for of error details , cause and possible solution to fix in your environment.

#1 ORA-12545: Connect failed because target host or object does not exist

#2 ORA-12547: TNS: lost contact

#3 ORA-12520: TNS:listener could not find available handler for requested type of server

#4 ORA-19506 ORA-27028 ORA-19511 VxBSACreateObject: Failed with error Server Status: Communication with the server has not been initiated

#5 ORA-02049: timeout: distributed transaction waiting for lock

#6 ORA-12154: TNS: could not resolve the connect identifier specified

#7 ORA-24330: internal OCI error

#8 ORA-03106: fatal two-task communication protocol error

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