arangoexport Options
The startup options of the arangoexport executable
Usage: arangoexport [<options>]
General
--check-configuration
Type: boolean
Check the configuration and exit.
This is a command, no value needs to be specified. The process terminates after executing the command.
--collection
Type: string…
Restrict the export to this collection name (can be specified multiple times).
--compress-output
Introduced in: v3.4.8, v3.5.1
Type: boolean
Compress files containing collection contents using the gzip format.
This option can be specified without a value to enable it.
--config
Type: string
The configuration file or “none”.
--configuration
Type: string
The configuration file or “none”.
--custom-query
Type: string
An AQL query to run.
--custom-query-bindvars
Introduced in: v3.10.0
Type: string
The bind parameters to be used with the --custom-query or --custom-query-file option.
--custom-query-file
Introduced in: v3.10.0
Type: string
A path to a file with the custom query to be used.
--custom-query-max-runtime
Introduced in: v3.8.0
Type: double
The runtime threshold for AQL queries (in seconds, 0 = no limit).
--define
Type: string…
Define a value for a @key@ entry in the configuration file using the syntax "key=value".
--documents-per-batch
Introduced in: v3.8.0
Type: uint64
The number of documents to return in each batch.
Default: 1000
--dump-dependencies
Type: boolean
Dump the dependency graph of the feature phases (internal) and exit.
This is a command, no value needs to be specified. The process terminates after executing the command.
--dump-options
Type: boolean
Dump all available startup options in JSON format and exit.
This is a command, no value needs to be specified. The process terminates after executing the command.
Introduced in: v3.8.5
Type: boolean
Prefix string cells in CSV output with extra single quote to prevent formula injection.
This option can be specified without a value to enable it.
Default: true
--fields
Type: string
A comma-separated list of fields to export to a CSV file.
--graph-name
Type: string
The name of a graph to export.
--honor-nsswitch
Type: boolean
Allow hostname lookup configuration via /etc/nsswitch.conf if on Linux/glibc.
This option can be specified without a value to enable it.
--log
Deprecated in: v3.5.0
Type: string…
Set the topic-specific log level, using --log level for the general topic or --log topic=level for the specified topic (can be specified multiple times). Available log levels: fatal, error, warning, info, debug, trace.
Default: info
--output-directory
Type: string
The output directory.
Default: /export
--overwrite
Type: boolean
Overwrite the data in the output directory.
This option can be specified without a value to enable it.
--progress
Type: boolean
Show the progress.
This option can be specified without a value to enable it.
Default: true
--type
Type: string
type of export
Default: jsonl
Possible values: “csv”, “json”, “jsonl”, “xgmml”, “xml”
--use-splice-syscall
Introduced in: v3.9.4
Type: boolean
Use the splice() syscall for file copying (may not be supported on all filesystems).
This option can be specified without a value to enable it.
Default: true
Available on Linux only.
Show detailsWhile the syscall is generally available since
Linux 2.6.x, it is also required that the underlying filesystem supports the
splice operation. This is not true for some encrypted filesystems
(e.g. ecryptfs), on which splice() calls can fail.
You can set the --use-splice-syscall startup option to false to use a less
efficient, but more portable file copying method instead, which should work on
all filesystems.
--version
Type: boolean
Print the version and other related information, then exit.
This is a command, no value needs to be specified. The process terminates after executing the command.
--version-json
Introduced in: v3.9.0
Type: boolean
Print the version and other related information in JSON format, then exit.
This is a command, no value needs to be specified. The process terminates after executing the command.
--xgmml-label-attribute
Type: string
Specify the document attribute to use as the XGMML label.
Default: label
--xgmml-label-only
Type: boolean
Export XGMML label only.
This option can be specified without a value to enable it.
encryption
--encryption.key-generator
Enterprise Edition
Type: string
A program providing the encryption key on stdout. If set, encryption at rest is enabled.
Show detailsThe program must output 32 bytes of data on the
standard output and exit.
--encryption.keyfile
Enterprise Edition
Type: string
The path to the file that contains the encryption key. Must contain 32 bytes of data. If set, encryption at rest is enabled.
Show detailsYou must secure the encryption key file so that
only arangodump, arangorestore, and arangod can access it. You should also
ensure that the file is not readable if someone steals your hardware, for
example, by encrypting /mytmpfs or creating an in-memory file-system under
/mytmpfs.
log
--log.color
Type: boolean
Use colors for TTY logging.
This option can be specified without a value to enable it.
Default: dynamic (e.g. true)
--log.escape-control-chars
Introduced in: v3.9.0
Type: boolean
Escape control characters in log messages.
This option can be specified without a value to enable it.
Default: true
Show detailsThis option applies to the control characters,
that have hex codes below \x20, and also the character DEL with hex code
\x7f.
If you set this option to false, control characters are retained when they
have a visible representation, and replaced with a space character in case they
do not have a visible representation. For example, the control character \n
is visible, so a \n is displayed in the log. Contrary, the control character
BEL is not visible, so a space is displayed instead.
If you set this option to true, the hex code for the character is displayed,
for example, the BEL character is displayed as \x07.
The default value for this option is true to ensure compatibility with
previous versions.
A side effect of turning off the escaping is that it reduces the CPU overhead
for the logging. However, this is only noticeable if logging is set to a very
verbose level (e.g. debug or trace).
--log.escape-unicode-chars
Introduced in: v3.9.0
Type: boolean
Escape Unicode characters in log messages.
This option can be specified without a value to enable it.
Show detailsIf you set this option to false, Unicode
characters are retained and written to the log as-is. For example, 犬 is
logged as 犬.
If you set this options to true, any Unicode characters are escaped, and the
hex codes for all Unicode characters are logged instead. For example, 犬 is
logged as \u72AC.
The default value for this option is set to false for compatibility with
previous versions.
A side effect of turning off the escaping is that it reduces the CPU overhead
for the logging. However, this is only noticeable if logging is set to a very
verbose level (e.g. debug or trace).
--log.file
Type: string
shortcut for ‘--log.output file://’
Default: -
--log.file-group
Introduced in: v3.4.5
Type: string
group to use for new log file, user must be a member of this group
--log.file-mode
Introduced in: v3.4.5
Type: string
mode to use for new log file, umask will be applied as well
--log.force-direct
Type: boolean
Do not start a separate thread for logging.
This option can be specified without a value to enable it.
Show detailsYou can use this option to disable logging in an
extra logging thread. If set to true, any log messages are immediately
printed in the thread that triggered the log message. This is non-optimal for
performance but can aid debugging. If set to false, log messages are handed
off to an extra logging thread, which asynchronously writes the log messages.
--log.foreground-tty
Type: boolean
Also log to TTY if backgrounded.
This option can be specified without a value to enable it.
--log.hostname
Introduced in: v3.8.0
Type: string
The hostname to use in log message. Leave empty for none, use “auto” to automatically determine a hostname.
Show detailsYou can specify a hostname to be logged at the
beginning of each log message (for regular logging) or inside the hostname
attribute (for JSON-based logging).
The default value is an empty string, meaning no hostnames is logged.
If you set this option to auto, the hostname is automatically determined.
--log.ids
Introduced in: v3.5.0
Type: boolean
Log unique message IDs.
This option can be specified without a value to enable it.
Default: true
Show detailsEach log invocation in the ArangoDB source code
contains a unique log ID, which can be used to quickly find the location in the
source code that produced a specific log message.
Log IDs are printed as 5-digit hexadecimal identifiers in square brackets
between the log level and the log topic:
2020-06-22T21:16:48Z [39028] INFO [144fe] {general} using storage engine 'rocksdb' (where 144fe is the log ID).
--log.level
Type: string…
Set the topic-specific log level, using --log.level level for the general topic or --log.level topic=level for the specified topic (can be specified multiple times).
Available log levels: fatal, error, warning, info, debug, trace.
Available log topics: all, agency, agencycomm, agencystore, aql, audit-authentication, audit-authorization, audit-collection, audit-database, audit-document, audit-hotbackup, audit-service, audit-view, authentication, authorization, backup, bench, cache, cluster, communication, config, crash, development, dump, engines, flush, general, graphs, heartbeat, httpclient, ldap, license, maintenance, memory, mmap, pregel, queries, rep-state, replication, replication2, requests, restore, rocksdb, security, ssl, startup, statistics, supervision, syscall, threads, trx, ttl, v8, validation, views.
Default: info
Show detailsArangoDB’s log output is grouped by topics.
--log.level can be specified multiple times at startup, for as many topics as
needed. The log verbosity and output files can be adjusted per log topic.
arangod --log.level all=warning --log.level queries=trace --log.level startup=trace
This sets a global log level of warning and two topic-specific levels
(trace for queries and info for startup). Note that --log.level warning
does not set a log level globally for all existing topics, but only the
general topic. Use the pseudo-topic all to set a global log level.
The same in a configuration file:
[log]
level = all=warning
level = queries=trace
level = startup=trace
The available log levels are:
fatal: Only log fatal errors.error: Only log errors.warning: Only log warnings and errors.info: Log information messages, warnings, and errors.debug: Log debug and information messages, warnings, and errors.trace: Logs trace, debug, and information messages, warnings, and errors.
Note that the debug and trace levels are very verbose.
Some relevant log topics available in ArangoDB 3 are:
agency: Information about the cluster Agency.performance: Performance-related messages.queries: Executed AQL queries, slow queries.replication: Replication-related information.requests: HTTP requests.startup: Information about server startup and shutdown.threads: Information about threads.
You can adjust the log levels at runtime via the PUT /_admin/log/level
HTTP API endpoint.
Audit logging (Enterprise Edition): The server logs all audit events by
default. Low priority events, such as statistics operations, are logged with the
debug log level. To keep such events from cluttering the log, set the
appropriate log topics to the info log level.
--log.line-number
Type: boolean
Include the function name, file name, and line number of the source code that issues the log message. Format: [func@FileName.cpp:123]
This option can be specified without a value to enable it.
--log.max-entry-length
Introduced in: v3.7.9
Type: uint32
The maximum length of a log entry (in bytes).
Default: 134217728
Show detailsNote: This option does not include audit log
messages. See --audit.max-entry-length instead.
Any log messages longer than the specified value are truncated and the suffix
... is added to them.
The purpose of this option is to shorten long log messages in case there is not
a lot of space for log files, and to keep rogue log messages from overusing
resources.
The default value is 128 MB, which is very high and should effectively mean
downwards-compatibility with previous arangod versions, which did not restrict
the maximum size of log messages.
--log.max-queued-entries
Introduced in: v3.10.12, v3.11.5
Type: uint32
Upper limit of log entries that are queued in a background thread.
Default: 10000
Show detailsLog entries are pushed on a queue for asynchronous
writing unless you enable the --log.force-direct startup option. If you use a
slow log output (e.g. syslog), the queue might grow and eventually overflow.
You can configure the upper bound of the queue with this option. If the queue is
full, log entries are written synchronously until the queue has space again.
--log.output
Type: string…
Log destination(s), e.g. file:///path/to/file (any occurrence of $PID is replaced with the process ID).
Show detailsThis option allows you to direct the global or
per-topic log messages to different outputs. The output definition can be one
of the following:
- for stdin+ for stderrsyslog://<syslog-facility>syslog://<syslog-facility>/<application-name>file://<relative-or-absolute-path>
To set up a per-topic output configuration, use
--log.output <topic>=<definition>:
--log.output queries=file://queries.log
The above example logs query-related messages to the file queries.log.
You can specify the option multiple times in order to configure the output
for different log topics:
--log.level queries=trace --log.output queries=file:///queries.log --log.level requests=info --log.output requests=file:///requests.log
The above example logs all query-related messages to the file queries.log
and HTTP requests with a level of info or higher to the file requests.log.
Any occurrence of $PID in the log output value is replaced at runtime with
the actual process ID. This enables logging to process-specific files:
--log.output 'file://arangod.log.$PID'
Note that dollar sign may need extra escaping when specified on a
command-line such as Bash.
If you specify --log.file-mode <octalvalue>, then any newly created log
file uses octalvalue as file mode. Please note that the umask value is
applied as well.
If you specify --log.file-group <name>, then any newly created log file tries
to use <name> as the group name. Note that you have to be a member of that
group. Otherwise, the group ownership is not changed. This option is only
available under Linux and macOS. It is not available under Windows.
The old --log.file option is still available for convenience. It is a
shortcut for the more general option --log.output file://filename.
The old --log.requests-file option is still available. It is a shortcut for
the more general option --log.output requests=file://....
Deprecated in: v3.5.0
Type: boolean
Shortcut for --log.level performance=trace.
This option can be specified without a value to enable it.
--log.prefix
Type: string
Prefix log message with this string.
Show detailsExample: arangod ... --log.prefix "-->"
2020-07-23T09:46:03Z --> [17493] INFO ...
--log.process
Introduced in: v3.8.0
Type: boolean
Show the process identifier (PID) in log messages.
This option can be specified without a value to enable it.
Default: true
--log.request-parameters
Type: boolean
include full URLs and HTTP request parameters in trace logs
This option can be specified without a value to enable it.
Default: true
--log.role
Type: boolean
Log the server role.
This option can be specified without a value to enable it.
Show detailsIf you set this option to true, log messages
contains a single character with the server’s role. The roles are:
U: Undefined / unclear (used at startup)S: Single serverC: CoordinatorP: Primary / DB-ServerA: Agent
--log.shorten-filenames
Type: boolean
shorten filenames in log output (use with --log.line-number)
This option can be specified without a value to enable it.
Default: true
--log.structured-param
Introduced in: v3.10.0
Type: string…
Toggle the usage of the log category parameter in structured log messages.
Show detailsSome log messages can be displayed together with
additional information in a structured form. The following parameters are
available:
database: The name of the database.username: The name of the user.url: The endpoint path.pregelID: The ID of the Pregel job.
The format to enable or disable a parameter is <parameter>=<bool>, or
<parameter> to enable it. You can specify the option multiple times to
configure multiple parameters:
arangod --log.structured-param database=true --log.structured-param url --log.structured-param username=false
You can adjust the parameter settings at runtime using the
/_admin/log/structured HTTP API.
--log.thread
Type: boolean
Show the thread identifier in log messages.
This option can be specified without a value to enable it.
--log.thread-name
Type: boolean
Show thread name in log messages.
This option can be specified without a value to enable it.
Introduced in: v3.5.0
Type: string
The time format to use in logs.
Default: utc-datestring
Possible values: “local-datestring”, “timestamp”, “timestamp-micros”, “timestamp-millis”, “uptime”, “uptime-micros”, “uptime-millis”, “utc-datestring”, “utc-datestring-micros”, “utc-datestring-millis”
Show detailsOverview over the different options:
| Format | Example | Description |
|---|
timestamp | 1553766923000 | Unix timestamps, in seconds |
timestamp-millis | 1553766923000.123 | Unix timestamps, in seconds, with millisecond precision |
timestamp-micros | 1553766923000.123456 | Unix timestamps, in seconds, with microsecond precision |
uptime | 987654 | seconds since server start |
uptime-millis | 987654.123 | seconds since server start, with millisecond precision |
uptime-micros | 987654.123456 | seconds since server start, with microsecond precision |
utc-datestring | 2019-03-28T09:55:23Z | UTC-based date and time in format YYYY-MM-DDTHH:MM:SSZ |
utc-datestring-millis | 2019-03-28T09:55:23.123Z | like utc-datestring, but with millisecond precision |
local-datestring | 2019-03-28T10:55:23 | local date and time in format YYYY-MM-DDTHH:MM:SS |
Introduced in: v3.8.0
Type: boolean
Use JSON as output format for logging.
This option can be specified without a value to enable it.
Show detailsYou can use this option to switch the log output
to the JSON format. Each log message then produces a separate line with
JSON-encoded log data, which can be consumed by other applications.
The object attributes produced for each log message are:
| Key | Value |
|---|
time | date/time of log message, in format specified by --log.time-format |
prefix | only emitted if --log.prefix is set |
pid | process id, only emitted if --log.process is set |
tid | thread id, only emitted if --log.thread is set |
thread | thread name, only emitted if --log.thread-name is set |
role | server role (1 character), only emitted if --log.role is set |
level | log level (e.g. "WARN", "INFO") |
file | source file name of log message, only emitted if --log.line-number is set |
line | source file line of log message, only emitted if --log.line-number is set |
function | source file function name, only emitted if --log.line-number is set |
topic | log topic name |
id | log id (5 digit hexadecimal string), only emitted if --log.ids is set |
hostname | hostname if --log.hostname is set |
message | the actual log message payload |
--log.use-local-time
Deprecated in: v3.5.0
Type: boolean
Use the local timezone instead of UTC.
This option can be specified without a value to enable it.
Show detailsThis option is deprecated.
Use --log.time-format local-datestring instead.
--log.use-microtime
Deprecated in: v3.5.0
Type: boolean
Use Unix timestamps in seconds with microsecond precision.
This option can be specified without a value to enable it.
Show detailsThis option is deprecated.
Use --log.time-format timestamp-micros instead.
random
--random.generator
Type: uint32
The random number generator to use (1 = MERSENNE, 2 = RANDOM, 3 = URANDOM, 4 = COMBINED (not available on Windows), 5 = WinCrypt (Windows only). The options 2, 3, 4, and 5 are deprecated and will be removed in a future version.
Default: 1
Possible values: 1, 2, 3, 4
Show details1: a pseudo-random number generator using an
implication of the Mersenne Twister MT19937 algorithm2: use a blocking random (or pseudo-random) number generator3: use the non-blocking random (or pseudo-random) number generator supplied
by the operating system4: a combination of the blocking random number generator and the Mersenne
Twister (not available on Windows)5: use WinCrypt (Windows only)
server
--server.authentication
Type: boolean
Require authentication credentials when connecting (does not affect the server-side authentication settings).
This option can be specified without a value to enable it.
Default: true
--server.connection-timeout
Type: double
The connection timeout (in seconds).
Default: 5
--server.database
Type: string
The database name to use when connecting.
Default: _system
--server.endpoint
Type: string…
The endpoint to connect to. Use ’none’ to start without a server. Use http+ssl:// as schema to connect to an SSL-secured server endpoint, otherwise http+tcp:// or unix://
Default: tcp://127.0.0.1:8529
--server.max-packet-size
Type: uint64
The maximum packet size (in bytes) for client/server communication.
Default: 1073741824
--server.password
Type: string
The password to use when connecting. If not specified and authentication is required, the user is prompted for a password
--server.request-timeout
Type: double
The request timeout (in seconds).
Default: 1200
--server.username
Type: string
The username to use when connecting.
Default: root
ssl
--ssl.protocol
Type: uint64
The SSL protocol (1 = SSLv2 (unsupported), 2 = SSLv2 or SSLv3 (negotiated), 3 = SSLv3, 4 = TLSv1, 5 = TLSv1.2, 6 = TLSv1.3, 9 = generic TLS (negotiated))
Default: 5
Possible values: 1, 2, 3, 4, 5, 6, 9
temp
--temp.path
Type: string
The path for temporary files.
Show detailsArangoDB uses the path for storing temporary
files, for extracting data from uploaded zip files (e.g. for Foxx services),
and other things.
Ideally, the temporary path is set to an instance-specific subdirectory of the
operating system’s temporary directory. To avoid data loss, the temporary path
should not overlap with any directories that contain important data, for
example, the instance’s database directory.
If you set the temporary path to the same directory as the instance’s database
directory, a startup error is logged and the startup is aborted.
