PostgresDB 08006: Connection failure

Happens when the connection to the database fails.
  1. Check the PostgreSQL service status:
    • On Unix/Linux: sudo service postgresql status or systemctl status postgresql
    • On Windows, open Services from the Control Panel and look for PostgreSQL service.
  2. Review PostgreSQL Server Logs:
    • Default location varies, but check /var/log/postgresql/ on Linux or the data directory on Windows.
    • Look for entries around the time the error occurred to find specific reasons for failure.
  3. Verify Network Connectivity:
    • Ping the database server from the client machine: ping <database_server_ip>
    • If the database is on a remote server, use telnet <database_server_ip> 5432 to check if the PostgreSQL port is reachable.
  4. Check Database Connection Configuration:
    • Verify the connection details in your application configuration file or command line, including host, port, user, and password.
    • For a command line test: psql -h <host> -p <port> -U <user> -d <database_name>
  5. Ensure PostgreSQL is Listening on the Correct Port and Interfaces:
    • On the database server, check postgresql.conf for listen_addresses and port settings.
    • You can find postgresql.conf typically in the data directory /var/lib/postgresql/<version>/data/ on Linux.
  6. Review pg_hba.conf File:
    • Ensure your client’s IP address or subnet is allowed to connect to the database in the pg_hba.conf file, located in the same directory as postgresql.conf.
    • Changes to pg_hba.conf require reloading PostgreSQL: SELECT pg_reload_conf(); or systemctl reload postgresql on the server.
  7. Check for Active Connections and Locks:
    • If you can connect through another session or tool, check for excessive connections or locks that might prevent new connections:
      • For active connections: SELECT * FROM pg_stat_activity;
      • For locks: SELECT * FROM pg_locks JOIN pg_class ON pg_locks.relation = pg_class.oid;
  8. Restart PostgreSQL Service:
    • If it's safe to do so, try restarting the PostgreSQL service:
      • On Unix/Linux: sudo service postgresql restart or systemctl restart postgresql
      • On Windows, use the Services panel to restart the PostgreSQL service.
  9. Check System Resources:
    • Ensure the server has sufficient CPU, memory, and disk space:
      • On Unix/Linux, use commands like top, free -m, and df -h.
      • On Windows, use Task Manager or Resource Monitor.

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MORE ISSUES

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PostgresDB 58000: System error
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PostgresDB 22001: String data right truncation
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PostgresDB 08003: Connection does not exist
When an operation is attempted on a non-existent connection.
PostgresDB 22007: Invalid datetime format
When the provided date or time format is invalid.
PostgresDB 22012: Division by zero
Occurs when there's an attempt to divide a number by zero.
PostgresDB 22003: Numeric value out of range
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PostgresDB 08001: SQL client unable to establish SQL connection
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PostgresDB 40001: Transaction rollback
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PostgresDB 40P01: Deadlock detected
Raised when a deadlock situation is detected within a transaction.
PostgresDB 08006: Connection failure
Happens when the connection to the database fails.
PostgresDB 40001: Serialization failure
Thrown during a transaction if a serialization issue occurs.
PostgresDB 42P18: Indeterminate Datatype
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PostgresDB 23514: Check violation
Happens when a CHECK constraint is not satisfied.
PostgresDB 23503: Foreign key violation
When a foreign key constraint is violated.
PostgresDB 23502: Not null violation
Occurs when a null value is inserted into a column with a NOT NULL constraint.
PostgresDB 23505: Unique violation
Thrown when a duplicate value violates a unique constraint.
PostgresDB 40002: Transaction Integrity Constraint Violation
The transaction violated an integrity constraint.
PostgresDB 42602: Invalid name
Happens when an identifier is invalid.
PostgresDB 42501: Insufficient privilege
When a user lacks the necessary permissions to perform an action.
PostgresDB 42601: Syntax error
Occurs when there's a mistake in the SQL syntax.
PostgresDB 42P21: Collation Mismatch
Mismatch in collation settings.
PostgresDB 42622: Name Too Long
The provided name exceeds the maximum allowed length.
PostgresDB 42804: Datatype Mismatch
Data type mismatch in the SQL statement.
PostgresDB 42939: Reserved Name
Attempted to use a reserved name.
PostgresDB 42602: Invalid Name
The specified name is invalid.
PostgresDB 42830: Invalid Foreign Key
Foreign key constraint is invalid.
PostgresDB 42P19: Invalid Recursion
Invalid use of recursion in a query.
PostgresDB 42846: Cannot Coerce
Unable to coerce a value to the required type.
PostgresDB 42P20: Windowing Error
Error in the window function.
PostgresDB 42803: Grouping Error
Error in the GROUP BY clause.
PostgresDB 42601: Syntax Error
Invalid syntax in the SQL statement.
PostgresDB 42501: Insufficient Privilege
Lacking sufficient privileges to perform the operation.
PostgresDB 42000: Syntax Error or Access Rule Violation
General syntax error or access rule violation.
PostgresDB 40P01: Deadlock Detected
Deadlock detected among transactions.
PostgresDB 40000: Transaction Rollback
General transaction rollback occurred.
PostgresDB 3F000: Invalid Schema Name
The specified schema name is invalid.
PostgresDB 40003: Statement Completion Unknown
The result of the SQL statement is unknown.
PostgresDB 3D000: Invalid Catalog Name
The specified catalog name is invalid.
PostgresDB 40001: Serialization Failure
Transaction could not be serialized due to a conflict.
PostgresDB 3B001: Invalid Savepoint Specification
The savepoint specification is invalid.
PostgresDB 38002: Modifying SQL Data Not Permitted
Modifying SQL data is not allowed in the external routine.
PostgresDB 3B000: Savepoint Exception
General savepoint exception occurred.
PostgresDB 39004: Null Value Not Allowed
Null value was not allowed in the external routine.
PostgresDB 39001: Invalid SQLSTATE Returned
An invalid SQLSTATE was returned by the external routine.
PostgresDB 39000: External Routine Invocation Exception
General external routine invocation exception.
PostgresDB 38004: Reading SQL Data Not Permitted
Reading SQL data is not allowed in the external routine.
PostgresDB 38003: Prohibited SQL Statement Attempted
Prohibited SQL statement was attempted in the external routine.
PostgresDB 38001: Containing SQL Not Permitted
SQL is not allowed in the external routine.
PostgresDB 34000: Invalid Cursor Name
The specified cursor name is invalid.
PostgresDB 38000: External Routine Exception
General external routine exception occurred.
PostgresDB 2F004: Reading SQL Data Not Permitted
Reading SQL data is not allowed in the current context.
PostgresDB 2F003: Prohibited SQL Statement Attempted
Prohibited SQL statement was attempted.
PostgresDB 2F002: Modifying SQL Data Not Permitted
Modifying SQL data is not allowed in the current context.
PostgresDB 2F005: Function Executed No Return Statement
Function executed without returning a value.
PostgresDB 25P02: In Failed SQL Transaction
SQL transaction is in a failed state.
PostgresDB 2F000: SQL Routine Exception
General SQL routine exception.
PostgresDB 2D000: Invalid Transaction Termination
Transaction termination is invalid.
PostgresDB 2BP01: Dependent Objects Still Exist
Dependent objects still exist in the database.
PostgresDB 28P01: Invalid Password
Provided password is invalid.
PostgresDB 2B000: Dependent Privilege Descriptors Still Exist
Dependent privilege descriptors are still present.
PostgresDB 26000: Invalid SQL Statement Name
The specified SQL statement name is invalid.
PostgresDB 25006: Read Only SQL Transaction
Attempted modification in a read-only transaction.
PostgresDB 27000: Triggered Data Change Violation
Data change violation triggered by the operation.
PostgresDB 28000: Invalid Authorization Specification
Authorization specification is invalid.
PostgresDB 25P03: Idle in Transaction Session Timeout
Transaction session timed out due to idleness.
PostgresDB 25P01: No Active SQL Transaction
No active SQL transaction to execute.
PostgresDB 25007: Schema and Data Statement Mixing Not Supported
Mixing schema and data statements is not supported.
PostgresDB 25005: No Active SQL Transaction for Branch Transaction
No active SQL transaction for a branch transaction.
PostgresDB 25004: Inappropriate Isolation Level for Branch Transaction
Inappropriate isolation level for a branch transaction.
PostgresDB 25008: Held Cursor Requires Same Isolation Level
Held cursor requires the same isolation level.
PostgresDB 25003: Inappropriate Access Mode for Branch Transaction
Inappropriate access mode for a branch transaction.
PostgresDB 25001: Active SQL Transaction
SQL transaction is already active.
PostgresDB 25002: Branch Transaction Already Active
A branch transaction is already active.
PostgresDB 22P04: Bad Copy File Format
Invalid format in a COPY file.
PostgresDB 25000: Invalid Transaction State
Transaction is in an invalid state.
PostgresDB 24000: Invalid Cursor State
Operation attempted on a cursor in an invalid state.
PostgresDB 23505: Unique Violation
Duplicate value violates a unique constraint.
PostgresDB 23001: Restrict Violation
Violation of a RESTRICT constraint.
PostgresDB 23P01: Exclusion Violation
An exclusion constraint was violated.
PostgresDB 23514: Check Violation
A CHECK constraint was violated.
PostgresDB 23503: Foreign Key Violation
A foreign key constraint was violated.
PostgresDB 23502: Not Null Violation
Null value was inserted into a column with a NOT NULL constraint.
PostgresDB 23000: Integrity Constraint Violation
A general integrity constraint violation occurred.
PostgresDB 2200T: Invalid XML Processing Instruction
The XML processing instruction is invalid.
PostgresDB 2200S: Invalid XML Comment
The XML comment is invalid.
PostgresDB 2200N: Invalid XML Content
Content within the XML is invalid.
PostgresDB 2200M: Invalid XML Document
The XML document is invalid.
PostgresDB 2200L: Not an XML Document
The provided data is not a valid XML document.
PostgresDB 22P05: Untranslatable Character
Character could not be translated.
PostgresDB 22P03: Invalid Binary Representation
Binary representation of a value is invalid.
PostgresDB 22P02: Invalid Text Representation
Text representation of a value is invalid.
PostgresDB 22P01: Floating Point Exception
Floating point operation caused an exception.
PostgresDB 2200F: Zero Length Character String
Character string has zero length.
PostgresDB 22024: Unterminated C String
C string was not properly terminated.

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