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Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/14248 ### Overview This diff introduces the addition of multi-scan statistics to RocksDB, enhancing the database's ability to monitor and analyze performance during multi-scan operations. ### Key Changes #### Implemented Multi-Scan Statistics The following statistics were implemented to provide deeper insights into multi-scan operations: - **MULTISCAN_PREPARE_MICROS**: Measures the time (in microseconds) spent preparing for multi-scan operations. - **MULTISCAN_BLOCKS_PER_PREPARE**: Tracks the number of blocks processed per multi-scan prepare operation. - **Wasted Prefetch Blocks Count**: Counts the number of prefetched blocks that were not used (i.e., wasted) if the iterator is abandoned before accessing them. - **MULTISCAN_TOTAL_BLOCKS_SCANNED**: Tracks the total number of blocks scanned during all multi-scan operations. - **MULTISCAN_TOTAL_KEYS_SCANNED**: Measures the total number of keys scanned across all multi-scan operations. - **MULTISCAN_TOTAL_MICROS**: Captures the total time (in microseconds) spent in multi-scan operations. - **MULTISCAN_PREFETCHED_BLOCKS**: Counts the number of blocks that were prefetched during multi-scan operations. - **MULTISCAN_USED_PREFETCH_BLOCKS**: Tracks the number of prefetched blocks that were actually used during multi-scan operations. ### Impact This diff provides more fine-grained statistics for multi-scan operations, allowing developers and users to better understand and optimize the performance of their RocksDB instances. Reviewed By: krhancoc Differential Revision: D91053297 fbshipit-source-id: 7158741b9f026c0b5ce8ba1264dbd137e7fe985d