概述
MyRocks提供了丰富的tools，如sst_dump, mysql_ldb等，这些工具对我们的运维和分析问题非常有用。
sst_dump 可以导出sst中的数据和属性信息。
sst_dump --help
sst_dump --file= [--command=check|scan|raw]
--file=
Path to SST file or directory containing SST files
--command=check|scan|raw|verify
check: Iterate over entries in files but dont print anything except if an error is encounterd (default command)
scan: Iterate over entries in files and print them to screen
raw: Dump all the table contents to _dump.txt
verify: Iterate all the blocks in files verifying checksum to detect possible coruption but dont print anything except if a corruption is encountered
recompress: reports the SST file size if recompressed with different
compression types
--output_hex
Can be combined with scan command to print the keys and values in Hex
--from=
Key to start reading from when executing check|scan
--to=
Key to stop reading at when executing check|scan
--prefix=
Returns all keys with this prefix when executing check|scan
Cannot be used in conjunction with --from
--read_num=
Maximum number of entries to read when executing check|scan
--verify_checksum
Verify file checksum when executing check|scan
--input_key_hex
Can be combined with --from and --to to indicate that these values are encoded in Hex
--show_properties
Print table properties after iterating over the file when executing
check|scan|raw
--set_block_size=
Can be combined with --command=recompress to set the block size that will
be used when trying different compression algorithms
--compression_types=
kSnappyCompression>
Can be combined with --command=recompress to run recompression for this
list of compression types
--parse_internal_key=<0xKEY>
Convenience option to parse an internal key on the command line. Dumps the
internal key in hex format {'key' @ SN: type}
mysql_ldb 工具功能非常强大，可以解析rocksdb各类文件，sst, manifest, wal等； 可以写入和查询数据；还提供了一些维护功能，详见如下help信息
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