Neo4j 4.0/4.1是最新的Neo4j 图数据库平台产品，提供多数据库、跨库查询、细粒度数据访问控制等丰富特性。相比3.5，4.0在配置方面也有不少改变。为了方便大家快速上手，这里提供一个配置样例。
1、系统环境
- Windows 10，Linux同样适用；
- JDK / OpenJDK 11
- CPU: 4 cores
- RAM: 32GB，分配给Neo4j一共6GB。
- 硬盘：强烈建议用SSD，如果没有就通过USB3 外接一个。
- 适用的数据库大小：<1亿节点、5亿关系，约50GB在数据库目录下。
2、样例配置neo4j.conf
#*****************************************************************
# Neo4j configuration
#
# For more details and a complete list of settings, please see
# https://neo4j.com/docs/operations-manual/current/reference/configuration-settings/
#*****************************************************************
# The name of the default database.
#dbms.default_database=neo4j
# Paths of directories in the installation.
#dbms.directories.data=data
#dbms.directories.plugins=plugins
#dbms.directories.logs=logs
#dbms.directories.lib=lib
#dbms.directories.run=run
#dbms.directories.metrics=metrics
#dbms.directories.transaction.logs.root=data/transactions
#dbms.directories.dumps.root=data/dumps
# This setting constrains all `LOAD CSV` import files to be under the `import` directory. Remove or comment it out to
# allow files to be loaded from anywhere in the filesystem; this introduces possible security problems. See the
# `LOAD CSV` section of the manual for details.
dbms.directories.import=import
# Whether requests to Neo4j are authenticated.
# To disable authentication, uncomment this line
#dbms.security.auth_enabled=false
# Enable this to be able to upgrade a store from an older version.
dbms.allow_upgrade=true
# Number of databases in Neo4j is limited.
# To change this limit please uncomment and adapt following setting:
# dbms.max_databases=100
# Enable online backups to be taken from this database.
#dbms.backup.enabled=true
# By default the backup service will only listen on localhost.
# To enable remote backups you will have to bind to an external
# network interface (e.g. 0.0.0.0 for all interfaces).
# The protocol running varies depending on deployment. In a Causal Clustering environment this is the
# same protocol that runs on causal_clustering.transaction_listen_address.
#dbms.backup.listen_address=0.0.0.0:6362
#********************************************************************
# Memory Settings
#********************************************************************
#
# Memory settings are specified kilobytes with the 'k' suffix, megabytes with
# 'm' and gigabytes with 'g'.
# If Neo4j is running on a dedicated server, then it is generally recommended
# to leave about 2-4 gigabytes for the operating system, give the JVM enough
# heap to hold all your transaction state and query context, and then leave the
# rest for the page cache.
# Java Heap Size: by default the Java heap size is dynamically calculated based
# on available system resources. Uncomment these lines to set specific initial
# and maximum heap size.
dbms.memory.heap.initial_size=512m
dbms.memory.heap.max_size=2g
# The amount of memory to use for mapping the store files.
# The default page cache memory assumes the machine is dedicated to running
# Neo4j, and is heuristically set to 50% of RAM minus the Java heap size.
dbms.memory.pagecache.size=4g
# Limit the amount of memory that all of the running transaction can consume.
# By default there is no limit.
dbms.memory.transaction.global_max_size=2g
# Limit the amount of memory that a single transaction can consume.
# By default there is no limit.
dbms.memory.transaction.max_size=256m
# Transaction state location. It is recommended to use ON_HEAP.
dbms.tx_state.memory_allocation=ON_HEAP
#*****************************************************************
# Network connector configuration
#*****************************************************************
# With default configuration Neo4j only accepts local connections.
# To accept non-local connections, uncomment this line:
dbms.default_listen_address=0.0.0.0
# You can also choose a specific network interface, and configure a non-default
# port for each connector, by setting their individual listen_address.
# The address at which this server can be reached by its clients. This may be the server's IP address or DNS name, or
# it may be the address of a reverse proxy which sits in front of the server. This setting may be overridden for
# individual connectors below.
dbms.default_advertised_address=192.168.0.209
# You can also choose a specific advertised hostname or IP address, and
# configure an advertised port for each connector, by setting their
# individual advertised_address.
# By default, encryption is turned off.
# To turn on encryption, an ssl policy for the connector needs to be configured
# Read more in SSL policy section in this file for how to define a SSL policy.
# Bolt connector
dbms.connector.bolt.enabled=true
#dbms.connector.bolt.tls_level=DISABLED
#dbms.connector.bolt.listen_address=:7687
# To add: bolt connection pool
#dbms.connector.bolt.thread_pool_min_size=5
#dbms.connector.bolt.thread_pool_max_size=400
#dbms.connector.bolt.thread_pool_keep_alive=5m
# HTTP Connector. There can be zero or one HTTP connectors.
dbms.connector.http.enabled=true
#dbms.connector.http.listen_address=:7474
# HTTPS Connector. There can be zero or one HTTPS connectors.
dbms.connector.https.enabled=false
#dbms.connector.https.listen_address=:7473
# Cluster Routing Connector. Enables the opening of an additional port to allow
# for internal communication using the same security configuration as CLUSTER
#dbms.routing.enabled=false
# Customize the listen address used for the routing connector port.
#dbms.routing.listen_address=0.0.0.0:7688
# Number of Neo4j worker threads.
#dbms.threads.worker_count=
#*****************************************************************
# SSL policy configuration
#*****************************************************************
# Each policy is configured under a separate namespace, e.g.
# dbms.ssl.policy.<scope>.*
# <scope> can be any of 'bolt', 'https', 'cluster' or 'backup'
#
# The scope is the name of the component where the policy will be used
# Each component where the use of an ssl policy is desired needs to declare at least one setting of the policy.
# Allowable values are 'bolt', 'https', 'cluster' or 'backup'.
# E.g if bolt and https connectors should use the same policy, the following could be declared
# dbms.ssl.policy.bolt.base_directory=certificates/default
# dbms.ssl.policy.https.base_directory=certificates/default
# However, it's strongly encouraged to not use the same key pair for multiple scopes.
#
# N.B: Note that a connector must be configured to support/require
# SSL/TLS for the policy to actually be utilized.
#
# see: dbms.connector.*.tls_level
# SSL settings (dbms.ssl.policy.<scope>.*)
# .base_directory Base directory for SSL policies paths. All relative paths within the
# SSL configuration will be resolved from the base dir.
#
# .private_key A path to the key file relative to the '.base_directory'.
#
# .private_key_password The password for the private key.
#
# .public_certificate A path to the public certificate file relative to the '.base_directory'.
#
# .trusted_dir A path to a directory containing trusted certificates.
#
# .revoked_dir Path to the directory with Certificate Revocation Lists (CRLs).
#
# .verify_hostname If true, the server will verify the hostname that the client uses to connect with. In order
# for this to work, the server public certificate must have a valid CN and/or matching
# Subject Alternative Names.
#
# .client_auth How the client should be authorized. Possible values are: 'none', 'optional', 'require'.
#
# .tls_versions A comma-separated list of allowed TLS versions. By de
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