PostgresDB 25006: Read Only SQL Transaction

Attempted modification in a read-only transaction.

When encountering the error 25006: Read Only SQL Transaction from a Postgres database, you should immediately take the following actions:

Check the current transaction mode:
- Run SHOW transaction_read_only; in your psql session to see if your transaction is set to read-only.
Inspect the current database session settings:
- Execute SELECT * FROM pg_settings WHERE name = 'default_transaction_read_only'; to verify if the database is operating in a read-only transaction mode by default.
Review active transactions:
- Use SELECT * FROM pg_stat_activity WHERE state = 'active'; to identify any active transactions that might be affecting your database's ability to write.
Examine replication status:
- If your database is a standby (read-only) replica in a replication setup, check its status with SELECT pg_is_in_recovery();. True indicates it is in recovery mode (read-only).
Check for any locks that might be causing issues:
- Execute SELECT * FROM pg_locks WHERE mode = 'ExclusiveLock' AND granted = 'f'; to find if there are any locks preventing write operations.
Look for database or tablespace read-only settings:
- Query the database read-only status: SELECT datname, datallowconn, datistemplate, datallowconn FROM pg_database WHERE datistemplate = false;.
- Check if any tablespaces are set to read-only: SELECT spcname, spcoptions FROM pg_tablespace;.

Taking these steps can help you identify why the PostgreSQL transaction is operating in read-only mode, allowing you to address the specific issue directly.

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