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+# 服务器用法
+    arangod [<option>]
+    
+    可以将数据库目录指定为位置 第一个参数
+    arangod /path/to/datadir
+    或者显示作为命名参数
+    arangod --database.directory /path/to/datadir
+    
+    所有其他参数都需要作为命名参数传递
+    两个连字符(--)后跟选项名称 然后 等号或者空格 最后是参数值 如果参数值包含了空格 还需要用引号引起来
+    = 两边 有空格
+    
+# 各种配置选项
+    
+## Global
+    Name	            Typ
+    check-configuration boolean
+    	检查配置并退出 这是一个命令，不需要指定任何值。执行命令后，进程终止。
+    config	            string
+        The configuration file or ‘none’
+        Default: ""
+    configuration       string
+        The configuration file or ‘none’
+        Default: ""
+    console 	        boolean
+        Start a JavaScript emergency console
+        This option can be specified without value to enable it.
+        Default: false
+    daemon	            boolean
+        Background the server, running it as daemon
+        This option can be specified without value to enable it.
+        Default: false
+    default-language    string
+        ISO-639 language code
+        Default: ""
+    define              string…
+        Define key=value for a @key@ entry in config file
+        Default: []
+    dump-dependencies   boolean
+        Dump dependency graph
+        This is a command, no value needs to be specified. The process terminates after executing the command.
+    dump-options        boolean
+        Dump configuration options in JSON format
+        This is a command, no value needs to be specified. The process terminates after executing the command.
+    fortune	            boolean
+        Show fortune cookie on startup
+        This option can be specified without value to enable it.
+        Default: false
+    gid	                string
+        Switch to group-id after reading config files
+        Default: ""
+    hund                boolean
+        Make ArangoDB bark on startup
+        This option can be specified without value to enable it.
+        Default: false
+    log	                string…
+        The global or topic-specific log level
+        Default: ["info","info"]
+        Deprecated in: v3.5.0
+    pid-file            string
+        Pid-file in daemon mode
+        Default: ""
+    supervisor	        boolean
+        Background the server, starts a supervisor
+        This option can be specified without value to enable it.
+        Default: false
+    uid	                string
+        Switch to user-id after reading config files
+        Default: ""
+    version             boolean
+        Reports the version and exits
+        This is a command, no value needs to be specified. The process terminates after executing the command.
+    working-directory	string
+        Working directory in daemon mode
+        Default: "/var/tmp"   
+
+## Agency
+    Name	Type	Description
+    agency.activate	boolean	Activate agency
+    This option can be specified without value to enable it.
+    Default: false
+    Effective on Agents only.
+    agency.compaction-keep-size	uint64	Keep as many indices before compaction point
+    Default: 50000
+    Effective on Agents only.
+    agency.compaction-step-size	uint64	Step size between state machine compactions
+    Default: 1000
+    Effective on Agents only.
+    agency.disaster-recovery-id	string	Allows for specification of the id for this agent; dangerous option for disaster recover only!
+    Default: ""
+    Effective on Agents only.
+    agency.election-timeout-max	double	Maximum timeout before an agent calls for new election (in seconds)
+    Default: 5
+    Effective on Agents only.
+    agency.election-timeout-min	double	Minimum timeout before an agent calls for new election (in seconds)
+    Default: 1
+    Effective on Agents only.
+    agency.endpoint	string…	Agency endpoints
+    Default: []
+    Effective on Agents only.
+    agency.max-append-size	uint64	Maximum size of appendEntries document (# log entries)
+    Default: 250
+    Effective on Agents only.
+    agency.my-address	string	Which address to advertise to the outside
+    Default: ""
+    Effective on Agents only.
+    agency.pool-size	uint64	Number of agent pool
+    Default: 1
+    Effective on Agents only.
+    agency.size	uint64	Number of agents
+    Default: 1
+    Effective on Agents only.
+    agency.supervision	boolean	Perform arangodb cluster supervision
+    This option can be specified without value to enable it.
+    Default: false
+    Effective on Agents only.
+    agency.supervision-frequency	double	Arangodb cluster supervision frequency (in seconds)
+    Default: 1
+    Effective on Agents only.
+    agency.supervision-grace-period	double	Supervision time, after which a server is considered to have failed (in seconds)
+    Default: 10
+    Effective on Agents only.
+    agency.supervision-ok-threshold	double	Supervision time, after which a server is considered to be bad [s]
+    Default: 5
+    Effective on Agents only.
+    agency.wait-for-sync	boolean	Wait for hard disk syncs on every persistence call (required in production)
+    This option can be specified without value to enable it.
+    Default: true
+    Effective on Agents only.  
+    
+##  ArangoSearch
+    Name	Type	Description
+    arangosearch.threads	uint64	The exact number of threads to use for asynchronous tasks (0 == autodetect)
+    Default: 0
+    arangosearch.threads-limit	uint64	Upper limit to the autodetected number of threads to use for asynchronous   
+    
+## Audit
+    Name	Type	Description
+    audit.hostname	string	Enterprise Edition only
+    Hostname to use
+    Default: ""
+    audit.output	string…	Enterprise Edition only
+    Audit destinatio    
+    
+## Backup    
+    Name	Type	Description
+    backup.api-enabled	string	Whether the backup api is enabled (true) or not (false), or only enabled for superuser JWT (jwt)
+    Default: "true"
+    backup.local-path-prefix	This option restricts any backup target to a given path prefix  Default: "/"
+    
+## Cache
+    cache.rebalancing-interval	uint64	Microseconds between rebalancing attempts
+    Default: 2000000
+    cache.size	uint64	Size of cache in bytes
+    Default: dynamic (e.g. 33252951040)    
+        
+## Cluster
+    Name	Type	Description
+    cluster.agency-endpoint	string…	Agency endpoint to connect to
+    Default: []
+    Effective on Coordinators and DB-Servers only.
+    cluster.create-waits-for-sync-replication	boolean	Active coordinator will wait for all replicas to create collection
+    This option can be specified without value to enable it.
+    Default: true
+    Effective on Coordinators and DB-Servers only.
+    cluster.default-replication-factor	uint32	Default replication factor for non-system collections
+    Default: 0
+    Effective on Coordinators only.
+    Introduced in: v3.6.0
+    cluster.force-one-shard	boolean	Force one-shard mode for all new collections
+    This option can be specified without value to enable it.
+    Default: false
+    Effective on Coordinators only.
+    Introduced in: v3.6.0
+    cluster.index-create-timeout	double	Amount of time (in seconds) the coordinator will wait for an index to be created before giving up
+    Default: 3600
+    Effective on Coordinators only.
+    cluster.max-number-of-shards	uint32	Maximum number of shards when creating new collections (0 = unrestricted)
+    Default: 1000
+    Effective on Coordinators only.
+    Introduced in: v3.5.1
+    cluster.max-replication-factor	uint32	Maximum replication factor for new collections (0 = unrestricted)
+    Default: 10
+    Effective on Coordinators only.
+    Introduced in: v3.6.0
+    cluster.min-replication-factor	uint32	Minimum replication factor for new collections
+    Default: 1
+    Effective on Coordinators only.
+    Introduced in: v3.6.0
+    cluster.my-address	string	This server’s endpoint (cluster internal)
+    Default: ""
+    Effective on Coordinators and DB-Servers only.
+    cluster.my-advertised-endpoint	string	This server’s advertised endpoint (e.g. external IP address or load balancer, optional)
+    Default: ""
+    Effective on Coordinators and DB-Servers only.
+    cluster.my-role	string	This server’s role
+    Default: ""
+    cluster.require-persisted-id	boolean	If set to true, then the instance will only start if a UUID file is found in the database on startup. Setting this option will make sure the instance is started using an already existing database directory and not a new one. For the first start, the UUID file must either be created manually or the option must be set to false for the initial startup
+    This option can be specified without value to enable it.
+    Default: false
+    cluster.resign-leadership-on-shutdown	boolean	Create resign leader ship job for this dbsever on shutdown
+    This option can be specified without value to enable it.
+    Default: false
+    Effective on DB-Servers only.
+    cluster.synchronous-replication-timeout-factor	double	All synchronous replication timeouts are multiplied by this factor
+    Default: 1
+    cluster.synchronous-replication-timeout-minimum	double	All synchronous replication timeouts will be at least this value (in seconds)
+    Default: 30
+    cluster.synchronous-replication-timeout-per-4k	double	All synchronous replication timeouts are increased by this amount per 4096 bytes (in seconds)
+    Default: 0.1
+    cluster.system-replication-factor	uint32	Default replication factor for system collections
+    Default: 2
+    Effective on Coordinators only.
+    cluster.upgrade	string	Perform a cluster upgrade if necessary (auto = perform upgrade and shut down only if --database.auto-upgrade true is set, disable = never perform upgrade, force = always perform an upgrade and shut down, online = always perform an upgrade but don’t shut down)
+    Default: "auto"
+    Possible values: “auto”, “disable”, “force”, “online”
+    cluster.write-concern	uint32	Write concern used for writes to new collections
+    Default: 1
+    Effective on Coordinators only.
+    Introduced in: v3.6.0    
+    
+## Database
+    Name	Type	Description
+    database.auto-upgrade	boolean	Perform a database upgrade if necessary
+    This option can be specified without value to enable it.
+    Default: false
+    database.check-version	boolean	Checks the versions of the database and exit
+    This is a command, no value needs to be specified. The process terminates after executing the command.
+    database.directory	string	Path to the database directory
+    Default: ""
+    database.force-sync-properties	boolean	Force syncing of collection properties to disk, will use waitForSync value of collection when turned off
+    This option can be specified without value to enable it.
+    Default: true
+    database.ignore-datafile-errors	boolean	Load collections even if datafiles may contain errors
+    This option can be specified without value to enable it.
+    Default: false
+    database.init-database	boolean	Initializes an empty database
+    This is a command, no value needs to be specified. The process terminates after executing the command.
+    database.password	string	Initial password of root user
+    Default: ""
+    database.required-directory-state	string	Required state of database directory at startup (non-existing: database directory must not exist, existing: database directory must exist, empty: database directory must exist but be empty, populated: database directory must exist and contain specific files already, any: any state allowed)
+    Default: "any"
+    Possible values: “any”, “empty”, “existing”, “non-existing”, “populated”
+    database.restore-admin	boolean	Resets the admin users and sets a new password
+    This is a command, no value needs to be specified. The process terminates after executing the command.
+    database.throw-collection-not-loaded-error	boolean	Throw an error when accessing a collection that is still loading
+    This option can be specified without value to enable it.
+    Default: false
+    Deprecated in: v3.7.0
+    database.upgrade-check	boolean	Skip a database upgrade
+    This option can be specified without value to enable it.
+    Default: true
+    database.wait-for-sync	boolean	Default wait-for-sync behavior, can be overwritten when creating a collection
+    This option can be     
+  
+##  Foxx
+    Name	Type	Description
+    foxx.api	boolean	Enables Foxx management REST APIs
+    This option can be specified without value to enable it.
+    Default: true
+    Effective on Coordinators and Single Servers only.
+    Introduced in: v3.5.0
+    foxx.queues	boolean	Enable Foxx queues
+    This option can be specified without value to enable it.
+    Default: true
+    Effective on Coordinators and Single Servers only.
+    foxx.queues-poll-interval	double	Poll interval (in seconds) for Foxx queue manager
+    Default: 1
+    Effective on Coordinators and Single Servers only.
+    foxx.store	boolean	Enables Foxx store in web interface
+    This option can be specified without value to enable it.
+    Default: true
+    Effective on Coordinators and Single Servers only.
+    Introduced in: v3.5.0   
+    
+# Frontend  
+    Name	Type	Description
+    frontend.proxy-request-check	boolean	Enable proxy request checking
+    This option can be specified without value to enable it.
+    Default: true
+    Effective on Coordinators and Single Servers only.
+    frontend.trusted-proxy	string…	List of proxies to trust (may be IP or network). Make sure --frontend.proxy-request-check is enabled
+    Default: []
+    Effective on Coordinators and Single Servers only.
+    frontend.version-check	boolean	Alert the user if new versions are available
+    This option can be specified without value to enable it.
+    Default: true
+    Effective on Coordinators and Single Servers only.  
+    
+## HTTP
+    Name	Type	Description
+    http.allow-method-override	boolean	Allow HTTP method override using special headers
+    This option can be specified without value to enable it.
+    Default: false
+    http.hide-product-header	boolean	Do not expose “Server: ArangoDB” header in HTTP responses
+    This option can be specified without value to enable it.
+    Default: false
+    http.keep-alive-timeout	double	Keep-alive timeout in seconds
+    Default: 300
+    http.trusted-origin	string…	Trusted origin URLs for CORS requests with credentials
+    Default: []   
+    
+# JavaScript
+    Name	Type	Description
+    javascript.allow-admin-execute	boolean	For testing purposes allow ‘_admin/execute’, NEVER enable on production
+    This option can be specified without value to enable it.
+    Default: false
+    Effective on Coordinators and Single Servers only.
+    javascript.allow-external-process-control	boolean	Allow execution and control of external processes from within JavaScript actions
+    This option can be specified without value to enable it.
+    Default: false
+    Effective on Coordinators and Single Servers only.
+    Introduced in: v3.5.0
+    javascript.allow-port-testing	boolean	Allow testing of ports from within JavaScript actions
+    This option can be specified without value to enable it.
+    Default: false
+    Effective on Coordinators and Single Servers only.
+    Introduced in: v3.5.0
+    javascript.app-path	string	Directory for Foxx applications
+    Default: "./js/apps"
+    Effective on Coordinators and Single Servers only.
+    javascript.copy-installation	boolean	Copy contents of ‘javascript.startup-directory’ on first start
+    This option can be specified without value to enable it.
+    Default: false
+    Effective on Coordinators and Single Servers only.
+    javascript.enabled	boolean	Enable the V8 JavaScript engine
+    This option can be specified without value to enable it.
+    Default: true
+    Effective on Coordinators and Single Servers only.
+    javascript.endpoints-blacklist	string…	Endpoints that cannot be connected to via @arangodb/request module in JavaScript actions if not whitelisted
+    Default: []
+    Effective on Coordinators and Single Servers only.
+    Introduced in: v3.5.0
+    javascript.endpoints-whitelist	string…	Endpoints that can be connected to via @arangodb/request module in JavaScript actions
+    Default: []
+    Effective on Coordinators and Single Servers only.
+    Introduced in: v3.5.0
+    javascript.environment-variables-blacklist	string…	Environment variables that will be inaccessible in JavaScript if not whitelisted
+    Default: []
+    Effective on Coordinators and Single Servers only.
+    Introduced in: v3.5.0
+    javascript.environment-variables-whitelist	string…	Environment variables that will be accessible in JavaScript
+    Default: []
+    Effective on Coordinators and Single Servers only.
+    Introduced in: v3.5.0
+    javascript.files-whitelist	string…	Filesystem paths that will be accessible from within JavaScript actions
+    Default: []
+    Effective on Coordinators and Single Servers only.
+    Introduced in: v3.5.0
+    javascript.gc-frequency	double	JavaScript time-based garbage collection frequency (each x seconds)
+    Default: 60
+    Effective on Coordinators and Single Servers only.
+    javascript.gc-interval	uint64	JavaScript request-based garbage collection interval (each x requests)
+    Default: 2000
+    Effective on Coordinators and Single Servers only.
+    javascript.harden	boolean	Disables access to JavaScript functions in the internal module: getPid() and logLevel()
+    This option can be specified without value to enable it.
+    Default: false
+    Effective on Coordinators and Single Servers only.
+    Introduced in: v3.5.0
+    javascript.module-directory	string…	Additional paths containing JavaScript modules
+    Default: ["./enterprise/js"]
+    Effective on Coordinators and Single Servers only.
+    javascript.script	string…	Run scripts and exit
+    Default: []
+    javascript.script-parameter	string…	Script parameter
+    Default: []
+    javascript.startup-directory	string	Path to the directory containing JavaScript startup scripts
+    Default: "./js"
+    Effective on Coordinators and Single Servers only.
+    javascript.startup-options-blacklist	string…	Startup options whose names match this regular expression will not be exposed (if not whitelisted) to JavaScript actions
+    Default: []
+    Effective on Coordinators and Single Servers only.
+    Introduced in: v3.5.0
+    javascript.startup-options-whitelist	string…	Startup options whose names match this regular expression will be whitelisted and exposed to JavaScript
+    Default: []
+    Effective on Coordinators and Single Servers only.
+    Introduced in: v3.5.0
+    javascript.v8-contexts	uint64	Maximum number of V8 contexts that are created for executing JavaScript actions
+    Default: 0
+    Effective on Coordinators and Single Servers only.
+    javascript.v8-contexts-max-age	double	Maximum age for each V8 context (in seconds) before it is disposed
+    Default: 60
+    Effective on Coordinators and Single Servers only.
+    javascript.v8-contexts-max-invocations	uint64	Maximum number of invocations for each V8 context before it is disposed
+    Default: 0
+    Effective on Coordinators and Single Servers only.
+    javascript.v8-contexts-minimum	uint64	Minimum number of V8 contexts that keep available for executing JavaScript actions
+    Default: 0
+    Effective on Coordinators and Single Servers only.
+    javascript.v8-max-heap	uint64	Maximal heap size (in MB)
+    Default: 3072
+    javascript.v8-options	string…	Options to pass to v8
+    Default: []
+    
+## LDAP  
+    Name	Type	Description
+    ldap.allow-offline	boolean	Enterprise Edition only
+    If a refresh attempt fails to connect to the LDAP server, continue with the cached authentication data
+    This option can be specified without value to enable it.
+    Default: false
+    ldap.async-connect	boolean	Enterprise Edition only
+    Whether or not the connection to the LDAP library will be done asynchronously
+    This option can be specified without value to enable it.
+    Default: false
+    ldap.basedn	string	Enterprise Edition only
+    Ldap basedn, eg. dc=example,dc=com
+    Default: ""
+    ldap.binddn	string	Enterprise Edition only
+    Ldap binddn, eg. cn=admin,dc=example,dc=com
+    Default: ""
+    ldap.bindpasswd	string	Enterprise Edition only
+    Ldap bindpassword, eg. admin
+    Default: ""
+    ldap.debug	boolean	Enterprise Edition only
+    Turn on internal OpenLDAP library output (warning: will print to stdout)
+    This option can be specified without value to enable it.
+    Default: false
+    ldap.enabled	boolean	Enterprise Edition only
+    Enable LDAP
+    This option can be specified without value to enable it.
+    Default: false
+    ldap.network-timeout	double	Enterprise Edition only
+    Timeout value (in seconds) after which network operations following the initial connection return in case of no activity (a value of 0 means default timeout)
+    Default: 0
+    ldap.port	uint16	Enterprise Edition only
+    Port to use
+    Default: 389
+    ldap.prefix	string	Enterprise Edition only
+    Ldap prefix, eg. uid= xor dn= xor cn=
+    Default: ""
+    ldap.referrals	boolean	Enterprise Edition only
+    Whether or not the LDAP library should implicitly chase referrals
+    This option can be specified without value to enable it.
+    Default: false
+    ldap.refresh-rate	double	Enterprise Edition only
+    Refresh user settings after this time (in seconds)
+    Default: 300
+    ldap.restart	boolean	Enterprise Edition only
+    Whether or not the LDAP library should implicitly restart connections
+    This option can be specified without value to enable it.
+    Default: false
+    ldap.retries	uint32	Enterprise Edition only
+    Number of tries to attempt connecting to the LDAP server. Setting it to values greater than one will retry connecting in case the LDAP server is unavailable or denies the connection
+    Default: 1
+    ldap.roles-attribute-name	string	Enterprise Edition only
+    Ldap attributename where the role are located.
+    Default: ""
+    ldap.roles-exclude	string	Enterprise Edition only
+    Regexp to exclude groups. Leave empty to exclude none.
+    Default: ""
+    ldap.roles-include	string	Enterprise Edition only
+    Regexp to include groups. Leave empty to include all.
+    Default: ""
+    ldap.roles-search	string	Enterprise Edition only
+    Ldap search for roles; ‘{USER}’ is replaced by the ‘dn’ of the user.
+    Default: ""
+    ldap.roles-transformation	string…	Enterprise Edition only
+    Regexp to normalizer role name, e.g. ‘/^ (.[^ ]])*/$2/’
+    Default: []
+    ldap.search-attribute	string	Enterprise Edition only
+    Ldap search attribute, eg. uid
+    Default: "uid"
+    ldap.search-filter	string	Enterprise Edition only
+    Ldap search filter, eg. (objectClass=simpleSecurityObject)
+    Default: "objectClass=*"
+    ldap.search-scope	string	Enterprise Edition only
+    Ldap search scope, one of base, one, sub
+    Default: "sub"
+    ldap.serialize-timeout	double	Enterprise Edition only
+    Maximum amount of time (in seconds) that will be waited for the serialization mutex
+    Default: 5
+    ldap.serialized	boolean	Enterprise Edition only
+    Whether or not calls into the LDAP library should be serialized. This option can be used to work around thread-unsafe LDAP library functionality
+    This option can be specified without value to enable it.
+    Default: false
+    ldap.server	string	Enterprise Edition only
+    Server to use
+    Default: ""
+    ldap.suffix	string	Enterprise Edition only
+    Ldap suffix, eg. ,dc=example,dc=com
+    Default: ""
+    ldap.superuser-role	string	Enterprise Edition only
+    Role mapping to the super-users
+    Default: ""
+    ldap.timeout	double	Enterprise Edition only
+    Timeout value (in seconds) for synchronous LDAP API calls (a value of 0 means default timeout)
+    Default: 0
+    ldap.tls	boolean	Enterprise Edition only
+    Enable TLS
+    This option can be specified without value to enable it.
+    Default: false
+    ldap.tls-cacert-dir	string	Enterprise Edition only
+    Ldap tls cacert dir
+    Default: ""
+    ldap.tls-cacert-file	string	Enterprise Edition only
+    Ldap tls cacert file
+    Default: ""
+    ldap.tls-cert-check-strategy	string	Enterprise Edition only
+    Ldap tls cert check strategy, one of never, hard, demand, allow, try
+    Default: "hard"
+    ldap.tls-version	string	Enterprise Edition only
+    Ldap tls version, one of 1.0, 1.1, 1.2
+    Default: "1.2"
+    ldap.url	string	Enterprise Edition only
+    Ldap url, eg. ldap://example.com:389/dc=example,dc=com?uid?sub
+    Default: ""    
\ No newline at end of file
diff --git a/arangodb/arangodb程序与工具.md b/arangodb/arangodb程序与工具.md
new file mode 100644
index 0000000..d6c56bc
--- /dev/null
+++ b/arangodb/arangodb程序与工具.md
@@ -0,0 +1,32 @@
+# 完成的arangodb软件包工具
+    二进制名称	简要描述;简介
+    arangod         ArangoDB服务器。该服务器程序旨在作为守护进程/服务运行，以通过TCP / HTTP与服务器建立各种客户端连接。它还提供了一个Web界面。
+    arangosh        ArangoDB shell。客户端，该客户端实现读评估打印循环（REPL）并提供访问和管理ArangoDB服务器的功能。
+    arangodb        ArangoDB Starter，可轻松部署ArangoDB实例。
+    arangodump      用于创建 ArangoDB数据库备份的工具。
+    arangorestore   将备份加载回ArangoDB数据库的工具。
+    arangobackup    工具来进行热备份操作上ArangoDB安装。
+    arangoimport    ArangoDB服务器的批量导入器。它支持JSON和CSV。
+    arangoexport    ArangoDB服务器的批量导出器。它支持JSON，CSV和XML。
+    arangobench     基准和测试工具。它可以用于性能和服务器功能测试。
+    arangoinspect   收集服务器设置信息的检查工具。
+    arangovpack     将VelocyPack数据转换为JSON的实用程序。 \
+    
+    客户端软件包附带了一部分程序和工具：
+    arangosh
+    arangoimport
+    arangoexport
+    arangodump
+    arangorestore
+    arangobackup
+    arangobench
+    arangoinspect
+    arangovpack
+    
+# 单独提供其他工具
+    单独提供的其他工具：
+    
+    名称	简要描述;简介
+    Foxx CLI        用于管理和开发Foxx服务的命令行工具
+    kube-arangodb	运营商来管理Kubernetes部署
+    Oasisctl        用于管理ArangoDB Oasis的命令行工具    
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diff --git a/arangodb/减少服务器的内存占用.md b/arangodb/减少服务器的内存占用.md
index ee2f2af..de4b4ff 100644
--- a/arangodb/减少服务器的内存占用.md
+++ b/arangodb/减少服务器的内存占用.md
@@ -80,6 +80,80 @@
     --javascript.v8-max-heap 512
     这会将V8隔离株的数量限制为两个。所有与JavaScript相关的请求都将排队，直到其中一个隔离可用于新任务为止。它还将堆大小限制为512 MB，因此在最坏的情况下，两个V8上下文组合使用的内存不能超过1 GB。          
     
-#   V8 for the Desperate
-      
+# V8 for the Desperate
+    除非有充分的理由，否则不要使用以下设置，例如性能不重要的本地开发系统或硬件资源非常有限的嵌入式系统！
+    
+    --javascript.v8-contexts 1
+    --javascript.v8-max-heap 256
+    您可以将V8的内存使用量减少到256 MB，而只有一个线程。例如，某些操作可能会因为某些操作耗尽内存而中止，例如在Web界面中。另外，JavaScript请求将被一一执行。
+    
+    如果您的内存非常紧张，并且确定不需要V8，则可以将其完全禁用：
+    
+    --javascript.enabled false
+    --foxx.queues false
+    因此，以下功能将不可用：
+    
+    Web界面的后端部分
+    Foxx应用
+    Foxx队列
+    GraphQL
+    基于JavaScript的交易
+    用户定义的AQL功能
+    请注意，可以为群集中的DB-Server和Agency节点禁用JavaScript / V8，而没有这些限制。它们适用于单个服务器实例。它们也适用于Coordinator节点，但是您不应在Coordinators上禁用V8，因为某些集群操作依赖于此。
+    
+# CPU使用率固定链接
+    我们不能真正减少CPU使用率，但是可以并行运行的线程数。同样，除非有很好的理由（例如嵌入式系统），否则您不应这样做。请注意，这将限制并发请求的性能，这对于只有您作为用户的本地开发系统来说可能是可以的。
+    
+    可以通过以下方式限制后台线程的数量：
+    
+    --arangosearch.threads-limit 1
+    --rocksdb.max-background-jobs 4
+    --server.maintenance-threads 2 
+    --server.maximal-threads 4
+    --server.minimal-threads 1
+    通常，选择线程数以适合机器。但是，每个线程至少需要8 MB的堆栈内存。通过牺牲一些用于并行执行的性能，可以减少此性能。
+    
+    此选项将使日志记录同步：
+    
+    --log.force-direct true
+    除非您仅记录错误和警告，否则不建议这样做。   
+    
+    
+# 缓存分配说明
+    例子固定链接
+    通常，您应该在标准服务器上调整读取缓冲区和边缘缓存。如果您有图用例，则应该使用更大的边缘缓存。例如，在读取缓冲区和边缘缓存之间以50:50的比例分配内存。如果没有边缘，则使用最小边缘缓存，并将大部分内存用于读取缓冲区。
+    例如，如果您有一台具有40 GB内存的计算机，并且想要将ArangoDB的内存限制为20 GB，则如果使用图形功能，则将10 GB用于边缘缓存，将10 GB用于读取缓冲区。
+    请记住，在查询执行期间，额外的内存将临时用于查询结果。如果您的内存不足，则可能需要每个7 GB。
+    如果您具有嵌入式系统或开发笔记本电脑，则可以使用上述所有设置来进一步减少内存占用。对于正常操作，特别是生产，不建议使用这些设置。    
+    
+    
+# Linux系统配置
+    ArangoDB的主要部署目标是Linux。正如您所了解的，ArangoDB及其内部结构在内存上的工作量很大。因此，至关重要的是要知道ArangoDB和Linux内核如何就此进行交互。linux内核提供了几种如何管理内存的模式。您可以通过proc文件系统，该文件/etc/sysctl.conf或/etc/sysctl.conf.d/系统在引导时将其应用于内核设置的文件来影响此设置。如下所述的设置适用于sysctl基础结构，这意味着它们以映射到proc文件系统/proc/sys/vm/overcommit_memory。
+    
+    甲vm.overcommit_memory的设定2可以引起在一些环境问题结合捆绑内存分配器ArangoDB附带（jemalloc）。
+    
+    分配器要求内核提供连续的内存块，这些内存块也映射到磁盘上的块。这是代表服务器进程（arangod）完成的。该过程可能会长时间使用一个块中的某些块，但仅在短时间内使用其他块，因此会释放内存。然后由分配器将释放的部分返回给内核。因为它只能返回连续的内存块，所以它必须将大块拆分为多个小块，然后可以返回未使用的块。
+    
+    随着vm.overcommit_memory内核设置值2，分配器可能与拆分现有的内存映射，这使得故障数量 的arangod服务器进程随时间增长的内存映射。这可能导致内核拒绝将更多内存分配给Arangod进程，即使有更多物理内存可用。内核将最多只授予vm.max_map_count 每个进程的内存映射，在许多Linux环境中默认为65530。
+    
+    运行vm.overcommit_memory设置为2的 jemalloc时的另一个问题是，对于某些工作负载，Linux内核随着已提交的内存跟踪的 内存量也会随着时间的推移而增长，而从未减少。最终， arangod可能仅由于达到配置的过量使用限制（物理RAM * overcommit_ratio+交换空间）而无法获得更多的内存。
+    
+    解决的办法是 修改的值vm.overcommit_memory 从2至任一0或1。这将解决这两个问题。无论使用过量提交设置如何，使用jemalloc时，我们仍然观察到虚拟内存消耗不断增加，但是实际上这不会引起任何问题。0是Linux内核的默认值，也是我们建议的设置。
+    
+    为了完整起见，让我们还提到另一种解决问题的方法：使用其他内存分配器。这要求从源代码编译ArangoDB而不使用jemalloc（-DUSE_JEMALLOC=Off在对cmake的调用中）。使用系统的libc分配器，您应该会看到相当稳定的内存使用情况。我们还尝试了另一个分配器，恰好是来自的分配器，libmusl随着时间的推移，这也显示出相当稳定的内存使用情况。阻碍我们更改捆绑分配器的原因在于，这是一次微不足道的更改，因为jemalloc对于大型多线程进程具有非常好的性能特征。
+    
+    测试减少的I / O缓冲区的效果
+    效果图
+    
+    15:50 –开始更大的进口
+    16:00 –一次开始写入〜60 KB大小的文档
+    16:45 –添加类似的第二作家
+    16:55 –使用上面建议的RocksDB写缓冲区配置重新启动ArangoDB
+    17:20 –缓冲区已满，写入性能下降
+    17:38 – WAL轮播
+    您在上面的性能图中看到的是限制写缓冲区的后果。在达到90％的写缓冲区填充率之前，服务器几乎可以遵循加载模式一段时间，但代价是不断增加缓冲区。一旦RocksDB达到90％的缓冲区填充率，它将显着将负载限制在〜50％。根据上游文档，这是预期的 ：
+    
+    如果可变存储器的总大小超过限制的90％，则会触发刷新。如果实际内存超出限制，则即使可变存储器的总大小小于90％，也可能触发更积极的刷新。
+    
+    由于我们仅测量磁盘I / O字节，因此看不到文档保存操作的请求时间也增加了一倍。       
     
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