```json { "table_name": "job_logs", "primary_key": "log_id", "candidates": [ { "rank": 0, "partition_key": "job_id", "partition_key_label": "E", "partition_key_reasoning": "job_id is the entity whose timeline we trace. RPUV = 508.06 indicates each job has ~508 log entries on average, which is ideal for partitioning. Top 3 coverage = 16.70% shows good distribution across 598 unique jobs. Semantically, this groups all log events for a single job execution together.", "clustering_key": "ts", "clustering_key_label": "S", "clustering_key_reasoning": "ts is the event timestamp with perfect uniqueness (1.000) and monotonicity (1.000 implied by unique timestamps). Sorting by ts within each job_id partition creates a chronological log timeline for each job, which is the natural access pattern for log analysis.", "world_line": "job_id", "session_column": null, "confidence": "HIGH", "notes": "Primary recommendation: partition by job_id to group all log events for each job execution, sorted chronologically by ts. This is the canonical organization for event logs where each job produces a sequence of timestamped log entries." }, { "rank": 1, "partition_key": "dataset_id", "partition_key_label": "E", "partition_key_reasoning": "dataset_id is an alternative entity perspective. RPUV = 2712.70 indicates each dataset has ~2,713 log entries on average. Top 3 coverage = 42.23% shows reasonable distribution across 112 unique datasets. This perspective groups all job logs related to a specific dataset.", "clustering_key": "ts", "clustering_key_label": "S", "clustering_key_reasoning": "ts provides chronological ordering of all log events for a dataset across multiple jobs. This enables dataset-centric analysis of processing history.", "world_line": "dataset_id", "session_column": "job_id", "confidence": "MEDIUM", "notes": "Alternative perspective: partition by dataset_id to analyze all processing activity for a specific dataset across multiple jobs. Useful for dataset-centric monitoring and debugging, though less natural than job-centric organization." } ] } ```