Neo4j memory management

Neo4j_memory_management

First understand the concepts
	https://neo4j.com/developer/guide-performance-tuning/
	https://neo4j.com/docs/operations-manual/current/performance/memory-configuration/#heap-sizing
	https://neo4j.com/docs/operations-manual/current/performance/#memory-tuning
	run $NEO4J_HOME/conf/neo4j.conf
Heap: is for queries and transactions
chache: is for retrieve easier from hard disk (I think)

Decide how much ram mem you want to give for
	OS operations: maybe 8g in my case. servers(1-3GB fully neo4j dedicated)	
		It is not possible to explicitly configure this you can estimate it setting heap and cache
		also consider neo4j will use also this space for lucene 
	Heap: "enough" for your transaction needs
		For example, long-running queries, or very complicated queries, are likely to require a larger heap than simpler queries. 
		to determine it tune our queries, and monitor their memory usage
		Parameters: set them to the same value for avoid unwanted full garbage collection pauses. 
			dbms.memory.heap.initial_size and dbms.memory.heap.max_size.
	cache: the rest
		dbms.memory.pagecache.size
		a way to estimate it is set it = (Data volume and native indexes)*1.2
			use memrec, the 0.2 additional is because future growing of db


	check neo4j automatic recommendation
	bin/neo4j-admin memrec --database=graph.db