Error map
ORA-12541 ORA-12541: TNS:no listener
SQL · layer 5, Data
Centre: this error. First ring: errors it is linked with (7). Outer ring: what those are linked with. Colours show the layer of a request each error belongs to. Click any dot to re-centre the map on it; hover to follow its connections. The centre dot opens the error page.
Directly related (7)
SQL Server: A network-related or instance-specific error occurred while establishing a connection to SQL Server. (provider: Named Pipes Provider, error: 40 / TCP Provider, error: 26)
The client couldn’t reach the SQL Server instance — wrong server name/instance, TCP disabled, firewall, or SQL Browser not runnin…
MySQL ERROR 2003 (HY000): Can't connect to MySQL server on 'host:3306' (111)
The client couldn’t reach MySQL over TCP — server down, wrong host/port, firewall, or MySQL bound to localhost only.
ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired
DDL or a NOWAIT lock couldn’t get the lock because another session holds it.
ORA-00001: unique constraint (SCHEMA.PK_X) violated
An insert/update duplicated a value in a unique or primary key constraint.
ORA-12154: TNS:could not resolve the connect identifier specified
The Oracle client couldn’t find the alias in tnsnames.ora (or the naming method can’t resolve it).
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
The listener is up but doesn’t know the service name you requested.
ORA-12505: TNS:listener does not currently know of SID given in connect descriptor
The connect string uses a SID the listener doesn’t know — often a service name passed as SID.
Two steps away (13)
SQL Server: Conversion failed when converting the varchar value 'x' to data type int. (Msg 245)
SQL Server tried to convert text to a number (often implicitly) and hit a non-numeric value.
SQL Server: Arithmetic overflow error converting expression to data type int. (Msg 8115)
A value or calculation exceeds the target data type’s range.
SQL Server: Cannot insert explicit value for identity column in table 'x' when IDENTITY_INSERT is set to OFF.
An INSERT supplied a value for an IDENTITY column.
MySQL ERROR 2002 (HY000): Can't connect to local MySQL server through socket
The client couldn’t reach the MySQL server — it isn’t running, or the client is looking for the socket/port in the wrong place.
MySQL ERROR 2006 (HY000): MySQL server has gone away
The connection to MySQL was closed — usually by a timeout or a packet larger than `max_allowed_packet`.
Error: socket hang up / read ECONNRESET
The other side closed the TCP connection abruptly while your client was still using it.
Deadlock found when trying to get lock; try restarting transaction
Two transactions waited on each other’s locks; the database killed one so the other could continue.
Lock wait timeout exceeded; try restarting transaction (MySQL 1205)
A query waited too long for a row lock held by another transaction and gave up.
MySQL ERROR 1213 (40001): Deadlock found when trying to get lock; try restarting transaction
MySQL detected a deadlock between two transactions and rolled one back.
MySQL ERROR 1062 (23000): Duplicate entry for key
An INSERT/UPDATE would create a duplicate value in a PRIMARY or UNIQUE key.
sqlite3.IntegrityError: UNIQUE constraint failed: users.email
An insert/update duplicated a value in a UNIQUE or PRIMARY KEY column in SQLite.
sqlite3.IntegrityError: NOT NULL constraint failed: table.column
A NULL went into a NOT NULL column in SQLite.
ORA-00904: "X": invalid identifier
A column name in the statement doesn’t exist (or is misquoted).
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