add rocksdb, elasticache

diagrams/2024/08/01/elasticache/diagram.yml

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+schema-version: 0.1
+# Required
+name: AWS Elasticache
+images:
+  - 1.png
+attribution: https://docs.aws.amazon.com/whitepapers/latest/scale-performance-elasticache/elasticache-for-memcached.html
+tags:
+  - cache
+  - aws
+# Optional
+author:
+description: When you deploy an ElastiCache Memcached cluster, it sits in your application as a separate tier alongside your database. As mentioned previously, Amazon ElastiCache does not directly communicate with your database tier, or indeed have any particular knowledge of your database. A simplified deployment for a web application looks similar to the following diagram.

diagrams/2024/08/02/rocksdb/diagram.yml

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+schema-version: 0.1
+# Required
+name: RocksDB
+images:
+  - 1.png
+attribution: https://github.com/facebook/rocksdb/wiki/RocksDB-Overview
+tags:
+  - facebook
+  - database
+# Optional
+author: Ramkumar Vadivelu
+description: RocksDB is a storage engine library of key-value store interface where keys and values are arbitrary byte streams. RocksDB organizes all data in sorted order and the common operations are Get(key), NewIterator(), Put(key, val), Delete(key), and SingleDelete(key).