Perform a VACUUM on the entire database.
Delete the relevant table files and restart PostgreSQL.
Set zero_damaged_pages to on and attempt to access the table again.
Execute CLUSTER on the relevant system table.
Start PostgreSQL in single-user mode and execute REINDEX INDEX on any indexes defined on the relevant table.
The number of simultaneous connections exceeded the value set by the max_connections parameter.
The number of concurrent connections exceeded the value set by the superuser_reserved_connections parameter.
The number of concurrent connections exceeded the value set by the db_connections parameter.
The number of concurrent connections exceeded the value of (max_connections - superuser_reserved_connections).
The number of concurrent connections exceeded the value of (db_connections - superuser_reserved_connections).
The query was canceled due to a user request.
The pg_cancel_backend function was executed against the process.
The pg_terminate_backend function was executed against the process.
A SIGKILL signal was sent by the OOM Killer.
A SIGSEGV signal was raised by the user_func user-defined function.
Set an appropriate memory allocation with maintenance_work_mem.
Set an appropriate memory allocation with shared_buffers.
Set an appropriate memory allocation with autovacuum_work_mem.
Restore the WAL file to a consistent state using pg_resetwal and start PostgreSQL.
Set an appropriate memory allocation with work_mem.
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