Database scan improvements #2264

Job	Run time
macOS [UBSAN] [lmdb \| clang]	37m 51s
Linux [UBSAN] [lmdb \| clang]	40m 46s
macOS [ASAN] [lmdb \| clang]	32m 15s
Linux [ASAN] [lmdb \| clang]	41m 3s
macOS [TSAN] [lmdb \| clang]	36m 43s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	40m 57s
Linux [TSAN] [lmdb \| clang]	45m 16s
macOS [UBSAN] [rocksdb \| clang]	5m 11s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	41m 31s
macOS [ASAN] [rocksdb \| clang]	42m 32s
Linux [UBSAN] [rocksdb \| clang]	53m 6s
macOS [TSAN] [rocksdb \| clang]	1h 12m 49s
Linux [ASAN] [rocksdb \| clang]	56m 49s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	57m 36s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	57m 8s
	11h 1m 33s

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