What is

PostgresDB 08003: Connection does not exist

 ?
  1. Check if the PostgreSQL service is running:
    • For Linux: sudo systemctl status postgresql
    • For Windows: Open Services (services.msc from Run), and check if the PostgreSQL service is running.
  2. Verify connectivity to the PostgreSQL server:
    • Use psql command: psql -h hostname -U username -d databasename replacing hostname, username, and databasename with your actual server details.
  3. Review PostgreSQL server logs for any errors or warnings that could indicate why connections are being refused or dropped. The log location varies, but you can usually find it in the PostgreSQL data directory, often named postgresql.log or within a log directory.
  4. Check for any firewall rules that might be blocking connections to the PostgreSQL port (default is 5432):
    • For Linux, use sudo iptables -L to list firewall rules.
    • For Windows, check the inbound rules in Windows Firewall.
  5. Ensure the postgresql.conf and pg_hba.conf files are correctly configured to allow connections:
    • For postgresql.conf, check the listen_addresses and port directive.
    • For pg_hba.conf, ensure your client's IP and connection method (e.g., host, hostssl) are correctly specified.
  6. Try restarting the PostgreSQL service to resolve any transient issues:
    • For Linux: sudo systemctl restart postgresql
    • For Windows: Restart the service from Services (services.msc).
  7. If using a connection pooler (e.g., PgBouncer), ensure it is correctly routing connections to the PostgreSQL server and is not misconfigured or down.
  8. Check the server's resources (CPU, RAM, disk space) to ensure it's not under heavy load or running out of resources, which could reject new connections. Use system monitoring tools:
    • For Linux: commands like top, htop, df, and free.
    • For Windows: Task Manager or Resource Monitor.
  9. Verify that the database you're trying to connect to exists and is accessible:
    • Connect to PostgreSQL with a superuser or a user with adequate privileges and list all databases: psql -U username -l.
  10. If the issue persists, consider restarting your client machine or checking for any network issues that might be affecting connectivity to the server.
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PostgresDB 40001: Serialization failure
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PostgresDB 23514: Check violation
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PostgresDB 23502: Not null violation
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PostgresDB 23505: Unique violation
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PostgresDB 42602: Invalid name
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PostgresDB 42622: Name Too Long
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PostgresDB 42939: Reserved Name
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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
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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
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PostgresDB 40000: Transaction Rollback
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PostgresDB 40003: Statement Completion Unknown
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The specified catalog name is invalid.
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PostgresDB 34000: Invalid Cursor Name
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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
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General SQL routine exception.
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Transaction termination is invalid.
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PostgresDB 28P01: Invalid Password
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Dependent privilege descriptors are still present.
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PostgresDB 25006: Read Only SQL Transaction
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PostgresDB 27000: Triggered Data Change Violation
Data change violation triggered by the operation.
PostgresDB 28000: Invalid Authorization Specification
Authorization specification is invalid.
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Transaction session timed out due to idleness.
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No active SQL transaction to execute.
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Mixing schema and data statements is not supported.
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No active SQL transaction for a branch transaction.
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Inappropriate isolation level for a branch transaction.
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Held cursor requires the same isolation level.
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Inappropriate access mode for a branch transaction.
PostgresDB 25001: Active SQL Transaction
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PostgresDB 25002: Branch Transaction Already Active
A branch transaction is already active.
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Invalid format in a COPY file.
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Operation attempted on a cursor in an invalid state.
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Duplicate value violates a unique constraint.
PostgresDB 23001: Restrict Violation
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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.
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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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