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+Storing logs in MyRocks. More than a billion rows. LZ4 compression.
+
+```
+apt-get install mariadb-plugin-rocksdb
+```
+
+Config `/etc/mysql/mariadb.conf.d/rocksdb.cnf`
+
+```
+[mariadb]
+plugin-load-add=ha_rocksdb.so
+rocksdb_db_write_buffer_size = 128M
+rocksdb_flush_log_at_trx_commit = 2
+rocksdb_max_background_jobs = 4
+rocksdb_block_cache_size = 1G
+rocksdb_block_size = 16K
+rocksdb-override-cf-options='default={target_file_size_base=32m;block_based_table_factory={filter_policy=bloomfilter:10:false;whole_key_filtering=1};compression=kNoCompression;bottommost_compression=kLZ4Compression;level_compaction_dynamic_level_bytes=true;compaction_pri=kMinOverlappingRatio;}'
+```
+
+Create table.
+```
+CREATE TABLE `logs` (
+  `date` date NOT NULL DEFAULT current_timestamp(),
+  `rid` int(11) NOT NULL,
+  `time` int(11) NOT NULL,
+  `mes` blob NOT NULL
+) ENGINE=ROCKSDB DEFAULT CHARSET=binary;
+```
+
+Create index.
+```
+ALTER TABLE `logs`
+  ADD KEY `a` (`rid`,`date`);
+COMMIT;
+```
+
+Try query.
+```
+MariaDB [db]> SELECT `time`, `mes` FROM `logs` WHERE `rid` = 27842 AND `date` = current_date ORDER BY `time` DESC;
+...
+1843 rows in set (0.012 sec)
+```
+
+```
+MariaDB [db]> DESCRIBE SELECT `time`, `mes` FROM `logs` WHERE `rid` = 27842 AND `date` = current_date ORDER BY `time` DESC;
++------+-------------+-------+------+---------------+------+---------+-------------+------+----------------------------------------------------+
+| id   | select_type | table | type | possible_keys | key  | key_len | ref         | rows | Extra                                              |
++------+-------------+-------+------+---------------+------+---------+-------------+------+----------------------------------------------------+
+|    1 | SIMPLE      | logs  | ref  | a             | a    | 7       | const,const | 2222 | Using index condition; Using where; Using filesort |
++------+-------------+-------+------+---------------+------+---------+-------------+------+----------------------------------------------------+
+```
+
+<img src="https://img.poiuty.com/a/3b/45e9617da6e59a285d331ebccef5343b.jpg">
+
+
+https://mariadb.com/kb/en/getting-started-with-myrocks/<br/>
+https://github.com/facebook/rocksdb/wiki/Space-Tuning<br/>
+https://github.com/facebook/rocksdb/wiki/Compression<br/>
+https://raw.githubusercontent.com/facebook/zstd/dev/doc/images/CSpeed2.png<br/>
+https://mariadb.com/kb/en/getting-started-with-myrocks/+comments/3412<br/>
+https://dataops.barcelona/wp-content/uploads/2019/07/MyRocks-101.pdf<br/>
+https://rocksdb.org/blog/2015/07/23/dynamic-level.html<br/>