PostgresDB 08006: Connection failure

Happens when the connection to the database fails.

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.
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.
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.
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>
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.
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.
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;
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.
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

PostgresDB 53100: Disk full

When the disk storage is full and cannot accommodate more data.

PostgresDB XX001: Data corrupted

Raised when data corruption is detected within the database.

PostgresDB XX000: Internal error

Represents an internal error that should not normally occur

PostgresDB 0A000: Feature not supported

Occurs when attempting to use a feature that is not supported by PostgreSQL.

PostgresDB 57P01: Admin shutdown

Thrown when the database is shut down administratively

PostgresDB 58000: System error

Represents a general system error

PostgresDB 53200: Out of memory

When the database server runs out of memory during an operation.

PostgresDB 22001: String data right truncation

Happens when the data is too large for the target column.

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

Thrown when a numeric value exceeds the range of the target column.

PostgresDB 08001: SQL client unable to establish SQL connection

Occurs when the client is unable to connect to the database server.

PostgresDB 40001: Transaction rollback

Indicates that the transaction was rolled back

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

The data type could not be determined.

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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