.\" Man page generated from reStructuredText. . .TH "MONGODUMP" "1" "Jun 21, 2018" "4.0" "mongodb-manual" .SH NAME mongodump \- MongoDB Data Dump Utility . .nr rst2man-indent-level 0 . .de1 rstReportMargin \\$1 \\n[an-margin] level \\n[rst2man-indent-level] level margin: \\n[rst2man-indent\\n[rst2man-indent-level]] - \\n[rst2man-indent0] \\n[rst2man-indent1] \\n[rst2man-indent2] .. .de1 INDENT .\" .rstReportMargin pre: . RS \\$1 . nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin] . nr rst2man-indent-level +1 .\" .rstReportMargin post: .. .de UNINDENT . RE .\" indent \\n[an-margin] .\" old: \\n[rst2man-indent\\n[rst2man-indent-level]] .nr rst2man-indent-level -1 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]] .in \\n[rst2man-indent\\n[rst2man-indent-level]]u .. .SS On this page .INDENT 0.0 .IP \(bu 2 \fI\%Synopsis\fP .IP \(bu 2 \fI\%Behavior\fP .IP \(bu 2 \fI\%Required Access\fP .IP \(bu 2 \fI\%Options\fP .IP \(bu 2 \fI\%Examples\fP .UNINDENT .INDENT 0.0 .INDENT 3.5 .IP "Mac OSX Sierra and Go 1.6 Incompatibility" .sp Users running on Mac OSX Sierra require the 3.2.10 or newer version of mongodump\&. .UNINDENT .UNINDENT .SH SYNOPSIS .sp \fI\%mongodump\fP is a utility for creating a binary export of the contents of a database. \fI\%mongodump\fP can export data from either \fBmongod\fP or \fBmongos\fP instances. .sp \fI\%mongodump\fP can be a part of a backup strategy with \fBmongorestore\fP for partial backups based on a query, syncing from production to staging or development environments, or changing the storage engine of a standalone. However, the use of \fI\%mongodump\fP and \fBmongorestore\fP as a backup strategy can be problematic for sharded clusters and replica sets. .sp Run \fI\%mongodump\fP from the system command line, not the \fBmongo\fP shell. .sp For an overview of \fI\%mongodump\fP in conjunction with \fBmongorestore\fP part of a backup and recovery strategy, see /tutorial/backup\-and\-restore\-tools\&. .sp \fBSEE ALSO:\fP .INDENT 0.0 .INDENT 3.5 \fBmongorestore\fP, /tutorial/backup\-sharded\-cluster\-with\-database\-dumps and /core/backups\&. .UNINDENT .UNINDENT .SH BEHAVIOR .SS Data Exclusion .sp \fI\%mongodump\fP excludes the content of the \fBlocal\fP database in its output. .sp \fI\%mongodump\fP only captures the documents in the database in its backup data and does not include index data. \fBmongorestore\fP or \fBmongod\fP must then rebuild the indexes after restoring data. .sp Changed in version 3.4: MongoDB 3.4 added support for read\-only views\&. By default, \fI\%mongodump\fP only captures a view’s metadata: it does not create a binary export of the documents included in the view. To capture the documents in a view use \fI\%\-\-viewsAsCollections\fP\&. .SS Read Preference .SS Replica Sets .sp Changed in version 3.2.0: The choice of target or targets for the \fI\%\-\-host\fP parameter affects the read preference of \fI\%mongodump\fP when connecting to a replica set. .INDENT 0.0 .IP \(bu 2 If the string passed to \fB\-\-host\fP is prefixed by the replica set name, \fI\%mongodump\fP reads from the \fBprimary\fP replica set member by default. For example: .INDENT 2.0 .INDENT 3.5 .sp .nf .ft C \-\-host "replSet/rep1.example.net:27017,rep2.example.net:27017,rep3.example.net:27017" .ft P .fi .UNINDENT .UNINDENT .IP \(bu 2 If the string passed to \fB\-\-host\fP contains a list of \fBmongod\fP instances, but does not include the replica set name as a prefix to the host string, \fI\%mongodump\fP reads from the \fBnearest\fP node by default. For example: .INDENT 2.0 .INDENT 3.5 .sp .nf .ft C \-\-host "rep1.example.net:27017,rep2.example.net:27017,rep3.example.net:27017" .ft P .fi .UNINDENT .UNINDENT .UNINDENT .SS Sharded Clusters .sp Changed in version 3.0.5: For a sharded cluster where the shards are replica sets, \fI\%mongodump\fP no longer prefers reads from secondary members when run against the \fBmongos\fP instance. .sp For sharded clusters, specify the hostname of a \fBmongos\fP for the \fB\-\-host\fP option. \fI\%mongodump\fP reads from the \fBprimary\fP replica set member on each shard replica set in the cluster. .sp Unsharded collections in a sharded cluster are stored on a primary shard\&. \fI\%mongodump\fP reads from the primary replica set member on the primary shard for any unsharded collections. Note: each database has its own primary shard. .SS Overwrite Files .sp \fI\%mongodump\fP overwrites output files if they exist in the backup data folder. Before running the \fI\%mongodump\fP command multiple times, either ensure that you no longer need the files in the output folder (the default is the \fBdump/\fP folder) or rename the folders or files. .SS Data Compression Handling .sp When run against a \fBmongod\fP instance that uses the WiredTiger storage engine, \fI\%mongodump\fP outputs uncompressed data. .SS Working Set .sp \fI\%mongodump\fP can adversely affect performance of the \fBmongod\fP\&. If your data is larger than system memory, the \fI\%mongodump\fP will push the working set out of memory. .SH REQUIRED ACCESS .sp To run \fI\%mongodump\fP against a MongoDB deployment that has access control enabled, you must have privileges that grant \fBfind\fP action for each database to back up. The built\-in \fBbackup\fP role provides the required privileges to perform backup of any and all databases. .sp Changed in version 3.2.1: The \fBbackup\fP role provides additional privileges to back up the \fBsystem.profile\fP collection that exists when running with database profiling\&. Previously, users required \fBread\fP access on this collection. .SH OPTIONS .sp Changed in version 3.0.0: \fI\%mongodump\fP removed the \fB\-\-dbpath\fP as well as related \fB\-\-directoryperdb\fP and \fB\-\-journal\fP options. To use \fI\%mongodump\fP, you must run \fI\%mongodump\fP against a running \fBmongod\fP or \fBmongos\fP instance as appropriate. .INDENT 0.0 .TP .B mongodump .UNINDENT .INDENT 0.0 .TP .B \-\-help Returns information on the options and use of \fBmongodump\fP\&. .UNINDENT .INDENT 0.0 .TP .B \-\-verbose, \-v Increases the amount of internal reporting returned on standard output or in log files. Increase the verbosity with the \fB\-v\fP form by including the option multiple times, (e.g. \fB\-vvvvv\fP\&.) .UNINDENT .INDENT 0.0 .TP .B \-\-quiet Runs \fBmongodump\fP in a quiet mode that attempts to limit the amount of output. .sp This option suppresses: .INDENT 7.0 .IP \(bu 2 output from database commands .IP \(bu 2 replication activity .IP \(bu 2 connection accepted events .IP \(bu 2 connection closed events .UNINDENT .UNINDENT .INDENT 0.0 .TP .B \-\-version Returns the \fBmongodump\fP release number. .UNINDENT .INDENT 0.0 .TP .B \-\-uri New in version 3.4.6. .sp Specify a resolvable URI connection string for the \fBmongod\fP to which to connect. .sp The following is the standard URI connection scheme: .INDENT 7.0 .INDENT 3.5 .sp .nf .ft C mongodb://[username:password@]host1[:port1][,host2[:port2],...[,hostN[:portN]]][/[database][?options]] .ft P .fi .UNINDENT .UNINDENT .sp For detailed explanations of the components of this string, refer to the Connection String URI Format documentation. .sp \fBIMPORTANT:\fP .INDENT 7.0 .INDENT 3.5 The following \fI\%mongodump\fP options are incompatible with the \fB\-\-uri\fP option. Instead, specify these options as part of your \fB\-\-uri\fP connection string when applicable: .INDENT 0.0 .IP \(bu 2 \fB\-\-host\fP .IP \(bu 2 \fB\-\-port\fP .IP \(bu 2 \fB\-\-db\fP .IP \(bu 2 \fB\-\-username\fP .IP \(bu 2 \fB\-\-password\fP (when specifying the password as part of the URI connection string) .IP \(bu 2 \fB\-\-authenticationDatabase\fP .IP \(bu 2 \fB\-\-authenticationMechanism\fP .UNINDENT .UNINDENT .UNINDENT .UNINDENT .INDENT 0.0 .TP .B \-\-host <:port>, \-h <:port> \fIDefault\fP: localhost:27017 .sp Specifies a resolvable hostname for the \fBmongod\fP to which to connect. By default, the \fBmongodump\fP attempts to connect to a MongoDB instance running on the localhost on port number \fB27017\fP\&. .sp To connect to a replica set, specify the \fBreplSetName\fP and a seed list of set members, as in the following: .INDENT 7.0 .INDENT 3.5 .sp .nf .ft C /<:port>,<:port>,<...> .ft P .fi .UNINDENT .UNINDENT .sp You can always connect directly to a single MongoDB instance by specifying the host and port number directly. .sp Changed in version 3.0.0: If you use IPv6 and use the \fB
:\fP format, you must enclose the portion of an address and port combination in brackets (e.g. \fB[
]\fP). .UNINDENT .INDENT 0.0 .TP .B \-\-port \fIDefault\fP: 27017 .sp Specifies the TCP port on which the MongoDB instance listens for client connections. .UNINDENT .INDENT 0.0 .TP .B \-\-ipv6 \fIRemoved in version 3.0.\fP .sp Enables IPv6 support and allows \fBmongodump\fP to connect to the MongoDB instance using an IPv6 network. Prior to MongoDB 3.0, you had to specify \fI\%\-\-ipv6\fP to use IPv6. In MongoDB 3.0 and later, IPv6 is always enabled. .UNINDENT .INDENT 0.0 .TP .B \-\-ssl New in version 2.6. .sp Enables connection to a \fBmongod\fP or \fBmongos\fP that has TLS/SSL support enabled. .sp For more information about TLS/SSL and MongoDB, see /tutorial/configure\-ssl and /tutorial/configure\-ssl\-clients . .UNINDENT .INDENT 0.0 .TP .B \-\-sslCAFile New in version 2.6. .sp Specifies the \fB\&.pem\fP file that contains the root certificate chain from the Certificate Authority. Specify the file name of the \fB\&.pem\fP file using relative or absolute paths. .sp Starting in version 3.4, if \fB\-\-sslCAFile\fP or \fBssl.CAFile\fP is not specified and you are not using x.509 authentication, the system\-wide CA certificate store will be used when connecting to an TLS/SSL\-enabled server. .sp If using x.509 authentication, \fB\-\-sslCAFile\fP or \fBssl.CAFile\fP must be specified. .sp \fBWARNING:\fP .INDENT 7.0 .INDENT 3.5 \fBVersion 3.2 and earlier:\fP For TLS/SSL connections (\fB\-\-ssl\fP) to \fBmongod\fP and \fBmongos\fP, if the \fBmongodump\fP runs without the \fI\%\-\-sslCAFile\fP, \fBmongodump\fP will not attempt to validate the server certificates. This creates a vulnerability to expired \fBmongod\fP and \fBmongos\fP certificates as well as to foreign processes posing as valid \fBmongod\fP or \fBmongos\fP instances. Ensure that you \fIalways\fP specify the CA file to validate the server certificates in cases where intrusion is a possibility. .UNINDENT .UNINDENT .sp For more information about TLS/SSL and MongoDB, see /tutorial/configure\-ssl and /tutorial/configure\-ssl\-clients . .UNINDENT .INDENT 0.0 .TP .B \-\-sslPEMKeyFile New in version 2.6. .sp Specifies the \fB\&.pem\fP file that contains both the TLS/SSL certificate and key. Specify the file name of the \fB\&.pem\fP file using relative or absolute paths. .sp This option is required when using the \fI\%\-\-ssl\fP option to connect to a \fBmongod\fP or \fBmongos\fP that has \fBCAFile\fP enabled \fIwithout\fP \fBallowConnectionsWithoutCertificates\fP\&. .sp For more information about TLS/SSL and MongoDB, see /tutorial/configure\-ssl and /tutorial/configure\-ssl\-clients . .UNINDENT .INDENT 0.0 .TP .B \-\-sslPEMKeyPassword New in version 2.6. .sp Specifies the password to de\-crypt the certificate\-key file (i.e. \fI\%\-\-sslPEMKeyFile\fP). Use the \fI\%\-\-sslPEMKeyPassword\fP option only if the certificate\-key file is encrypted. In all cases, the \fBmongodump\fP will redact the password from all logging and reporting output. .sp If the private key in the PEM file is encrypted and you do not specify the \fI\%\-\-sslPEMKeyPassword\fP option, the \fBmongodump\fP will prompt for a passphrase. See ssl\-certificate\-password\&. .sp For more information about TLS/SSL and MongoDB, see /tutorial/configure\-ssl and /tutorial/configure\-ssl\-clients . .UNINDENT .INDENT 0.0 .TP .B \-\-sslCRLFile New in version 2.6. .sp Specifies the \fB\&.pem\fP file that contains the Certificate Revocation List. Specify the file name of the \fB\&.pem\fP file using relative or absolute paths. .sp For more information about TLS/SSL and MongoDB, see /tutorial/configure\-ssl and /tutorial/configure\-ssl\-clients . .UNINDENT .INDENT 0.0 .TP .B \-\-sslAllowInvalidCertificates New in version 2.6. .sp Bypasses the validation checks for server certificates and allows the use of invalid certificates. When using the \fBallowInvalidCertificates\fP setting, MongoDB logs as a warning the use of the invalid certificate. .sp Starting in MongoDB 4.0, if you specify \fB\-\-sslAllowInvalidCertificates\fP or \fBssl.allowInvalidCertificates: true\fP when using x.509 authentication, an invalid certificate is only sufficient to establish a TLS/SSL connection but is \fIinsufficient\fP for authentication. .sp \fBWARNING:\fP .INDENT 7.0 .INDENT 3.5 For TLS/SSL connections to \fBmongod\fP and \fBmongos\fP, avoid using \fB\-\-sslAllowInvalidCertificates\fP if possible and only use \fB\-\-sslAllowInvalidCertificates\fP on systems where intrusion is not possible. .sp If the \fBmongo\fP shell (and other mongodb\-tools\-support\-ssl) runs with the \fB\-\-sslAllowInvalidCertificates\fP option, the \fBmongo\fP shell (and other mongodb\-tools\-support\-ssl) will not attempt to validate the server certificates. This creates a vulnerability to expired \fBmongod\fP and \fBmongos\fP certificates as well as to foreign processes posing as valid \fBmongod\fP or \fBmongos\fP instances. .UNINDENT .UNINDENT .sp For more information about TLS/SSL and MongoDB, see /tutorial/configure\-ssl and /tutorial/configure\-ssl\-clients . .UNINDENT .INDENT 0.0 .TP .B \-\-sslAllowInvalidHostnames New in version 3.0. .sp Disables the validation of the hostnames in TLS/SSL certificates. Allows \fBmongodump\fP to connect to MongoDB instances even if the hostname in their certificates do not match the specified hostname. .sp For more information about TLS/SSL and MongoDB, see /tutorial/configure\-ssl and /tutorial/configure\-ssl\-clients . .UNINDENT .INDENT 0.0 .TP .B \-\-sslFIPSMode New in version 2.6. .sp Directs the \fBmongodump\fP to use the FIPS mode of the installed OpenSSL library. Your system must have a FIPS compliant OpenSSL library to use the \fI\%\-\-sslFIPSMode\fP option. .sp \fBNOTE:\fP .INDENT 7.0 .INDENT 3.5 FIPS\-compatible TLS/SSL is available only in \fI\%MongoDB Enterprise\fP\&. See /tutorial/configure\-fips for more information. .UNINDENT .UNINDENT .UNINDENT .INDENT 0.0 .TP .B \-\-username , \-u Specifies a username with which to authenticate to a MongoDB database that uses authentication. Use in conjunction with the \fB\-\-password\fP and \fB\-\-authenticationDatabase\fP options. .UNINDENT .INDENT 0.0 .TP .B \-\-password , \-p Specifies a password with which to authenticate to a MongoDB database that uses authentication. Use in conjunction with the \fB\-\-username\fP and \fB\-\-authenticationDatabase\fP options. .sp Changed in version 3.0.0: If you do not specify an argument for \fI\%\-\-password\fP, \fBmongodump\fP returns an error. .sp Changed in version 3.0.2: If you wish \fBmongodump\fP to prompt the user for the password, pass the \fI\%\-\-username\fP option without \fI\%\-\-password\fP or specify an empty string as the \fI\%\-\-password\fP value, as in \fB\-\-password ""\fP . .UNINDENT .INDENT 0.0 .TP .B \-\-authenticationDatabase Specifies the database in which the user is created. See user\-authentication\-database\&. .sp If you do not specify an authentication database, \fBmongodump\fP assumes that the database specified to export holds the user’s credentials. .sp If you do not specify an authentication database or a database to export, \fBmongodump\fP assumes the \fBadmin\fP database holds the user’s credentials. .UNINDENT .INDENT 0.0 .TP .B \-\-authenticationMechanism \fIDefault\fP: SCRAM\-SHA\-1 .sp Specifies the authentication mechanism the \fBmongodump\fP instance uses to authenticate to the \fBmongod\fP or \fBmongos\fP\&. .sp Changed in version 4.0: MongoDB removes support for the deprecated MongoDB Challenge\-Response (\fBMONGODB\-CR\fP) authentication mechanism. .sp MongoDB adds support for SCRAM mechanism using the SHA\-256 hash function (\fBSCRAM\-SHA\-256\fP). .TS center; |l|l|. _ T{ Value T} T{ Description T} _ T{ SCRAM\-SHA\-1 T} T{ \fI\%RFC 5802\fP standard Salted Challenge Response Authentication Mechanism using the SHA\-1 hash function. T} _ T{ SCRAM\-SHA\-256 T} T{ \fI\%RFC 7677\fP standard Salted Challenge Response Authentication Mechanism using the SHA\-256 hash function. .sp Requires featureCompatibilityVersion set to \fB4.0\fP\&. .sp New in version 4.0. T} _ T{ MONGODB\-X509 T} T{ MongoDB TLS/SSL certificate authentication. T} _ T{ GSSAPI (Kerberos) T} T{ External authentication using Kerberos. This mechanism is available only in \fI\%MongoDB Enterprise\fP\&. T} _ T{ PLAIN (LDAP SASL) T} T{ External authentication using LDAP. You can also use \fBPLAIN\fP for authenticating in\-database users. \fBPLAIN\fP transmits passwords in plain text. This mechanism is available only in \fI\%MongoDB Enterprise\fP\&. T} _ .TE .UNINDENT .INDENT 0.0 .TP .B \-\-gssapiServiceName New in version 2.6. .sp Specify the name of the service using GSSAPI/Kerberos\&. Only required if the service does not use the default name of \fBmongodb\fP\&. .sp This option is available only in MongoDB Enterprise. .UNINDENT .INDENT 0.0 .TP .B \-\-gssapiHostName New in version 2.6. .sp Specify the hostname of a service using GSSAPI/Kerberos\&. \fIOnly\fP required if the hostname of a machine does not match the hostname resolved by DNS. .sp This option is available only in MongoDB Enterprise. .UNINDENT .INDENT 0.0 .TP .B \-\-db , \-d Specifies a database to backup. If you do not specify a database, \fI\%mongodump\fP copies all databases in this instance into the dump files. .UNINDENT .INDENT 0.0 .TP .B \-\-collection , \-c Specifies a collection to backup. If you do not specify a collection, this option copies all collections in the specified database or instance to the dump files. .UNINDENT .INDENT 0.0 .TP .B \-\-query , \-q Provides a JSON document as a query that optionally limits the documents included in the output of \fI\%mongodump\fP\&. .sp You must enclose the query in single quotes (e.g. \fB\(aq\fP) to ensure that it does not interact with your shell environment. .UNINDENT .INDENT 0.0 .TP .B \-\-queryFile New in version 3.2. .sp Specifies the path to a file containing a JSON document as a query filter that limits the documents included in the output of \fI\%mongodump\fP\&. \fI\%\-\-queryFile\fP enables you to create query filters that are too large to fit in your terminal’s buffer. .UNINDENT .INDENT 0.0 .TP .B \-\-readPreference Specify the read preference for \fBmongodump\fP\&. .sp See replica\-set\-read\-preference\-modes\&. .sp \fBmongodump\fP defaults to \fBprimary\fP read preference when connected to a \fBmongos\fP or a replica set\&. .sp Otherwise, \fBmongodump\fP defaults to \fBnearest\fP\&. .sp \fBWARNING:\fP .INDENT 7.0 .INDENT 3.5 Using a read preference other than \fBprimary\fP with a connection to a \fBmongos\fP may produce inconsistencies, duplicates, or result in missed documents. .UNINDENT .UNINDENT .sp See \fI\%Read Preference\fP\&. .UNINDENT .INDENT 0.0 .TP .B \-\-forceTableScan Forces \fI\%mongodump\fP to scan the data store directly: typically, \fI\%mongodump\fP saves entries as they appear in the index of the \fB_id\fP field. If you specify a query \fI\%\-\-query\fP, \fBmongodump\fP will use the most appropriate index to support that query. .sp Use \fI\%\-\-forceTableScan\fP to skip the index and scan the data directly. Typically there are two cases where this behavior is preferable to the default: .INDENT 7.0 .IP 1. 3 If you have key sizes over 800 bytes that would not be present in the \fB_id\fP index. .IP 2. 3 Your database uses a custom \fB_id\fP field. .UNINDENT .sp When you run with \fI\%\-\-forceTableScan\fP, the dump produced by \fI\%mongodump\fP can reflect the state of the database at many different points in time. .sp \fBIMPORTANT:\fP .INDENT 7.0 .INDENT 3.5 Use \fI\%\-\-forceTableScan\fP with extreme caution and consideration. .UNINDENT .UNINDENT .UNINDENT .INDENT 0.0 .TP .B \-\-gzip New in version 3.2. .sp Compresses the output. If \fI\%mongodump\fP outputs to the dump directory, the new feature compresses the individual files. The files have the suffix \fB\&.gz\fP\&. .sp If \fI\%mongodump\fP outputs to an archive file or the standard out stream, the new feature compresses the archive file or the data output to the stream. .UNINDENT .INDENT 0.0 .TP .B \-\-out , \-o Specifies the directory where \fI\%mongodump\fP will write BSON files for the dumped databases. By default, \fI\%mongodump\fP saves output files in a directory named \fBdump\fP in the current working directory. .sp To send the database dump to standard output, specify “\fB\-\fP” instead of a path. Write to standard output if you want process the output before saving it, such as to use \fBgzip\fP to compress the dump. When writing standard output, \fI\%mongodump\fP does not write the metadata that writes in a \fB.metadata.json\fP file when writing to files directly. .sp You cannot use the \fB\-\-archive\fP option with the \fI\%\-\-out\fP option. .UNINDENT .INDENT 0.0 .TP .B \-\-archive New in version 3.2. .sp Writes the output to a single archive file or to the standard output (\fBstdout\fP). .sp To output the dump to an archive file, run \fI\%mongodump\fP with the new \fB\-\-archive\fP option and the archive filename. .sp To output the dump to the standard output stream in order to pipe to another process, run \fI\%mongodump\fP with the \fBarchive\fP option but \fIomit\fP the filename. .sp You cannot use the \fB\-\-archive\fP option with the \fI\%\-\-out\fP option. .UNINDENT .INDENT 0.0 .TP .B \-\-repair . \fBNOTE:\fP .INDENT 7.0 .INDENT 3.5 When repairing a database, you should use \fBmongod \-\-repair\fP rather than this option. For instructions on repairing a database, refer to /tutorial/recover\-data\-following\-unexpected\-shutdown\&. .UNINDENT .UNINDENT .sp Changes the behavior of \fBmongodump\fP to only write valid data and exclude data that may be in an invalid state as a result of an improper shutdown or \fBmongod\fP crash. .sp \fI\%\-\-repair\fP is different from \fBmongod \-\-repair\fP, and may produce a large amount of duplicate documents. It is only available for use against \fBmongod\fP instances using the \fBmmapv1\fP storage engine. You cannot run \fI\%\-\-repair\fP against \fBmongos\fP, or against \fBmongod\fP instances that use the \fBwiredTiger\fP storage engine. .sp For instructions on repairing a database, refer to /tutorial/recover\-data\-following\-unexpected\-shutdown\&. .UNINDENT .INDENT 0.0 .TP .B \-\-oplog Creates a file named \fBoplog.bson\fP as part of the \fI\%mongodump\fP output. The \fBoplog.bson\fP file, located in the top level of the output directory, contains oplog entries that occur during the \fI\%mongodump\fP operation. This file provides an effective point\-in\-time snapshot of the state of a \fBmongod\fP instance. To restore to a specific point\-in\-time backup, use the output created with this option in conjunction with \fBmongorestore \-\-oplogReplay\fP\&. .sp Without \fI\%\-\-oplog\fP, if there are write operations during the dump operation, the dump will not reflect a single moment in time. Changes made to the database during the update process can affect the output of the backup. .sp \fI\%\-\-oplog\fP has no effect when running \fI\%mongodump\fP against a \fBmongos\fP instance to dump the entire contents of a sharded cluster. However, you can use \fI\%\-\-oplog\fP to dump individual shards. .sp \fI\%\-\-oplog\fP only works against nodes that maintain an oplog\&. This includes all members of a replica set. .sp \fI\%\-\-oplog\fP does not dump the oplog collection. .sp \fBNOTE:\fP .INDENT 7.0 .INDENT 3.5 To use \fI\%mongodump\fP with \fI\%\-\-oplog\fP, you must create a full dump of a replica set member. \fI\%mongodump\fP with \fI\%\-\-oplog\fP fails if you use any of the following options to limit the data to be dumped: .INDENT 0.0 .IP \(bu 2 \fI\%\-\-db\fP .IP \(bu 2 \fI\%\-\-collection\fP .UNINDENT .UNINDENT .UNINDENT .sp \fBSEE ALSO:\fP .INDENT 7.0 .INDENT 3.5 \fBmongorestore \-\-oplogReplay\fP .UNINDENT .UNINDENT .UNINDENT .INDENT 0.0 .TP .B \-\-dumpDbUsersAndRoles Includes user and role definitions in the database’s dump directory when performing \fI\%mongodump\fP on a specific database. This option applies only when you specify a database in the \fI\%\-\-db\fP option. MongoDB always includes user and role definitions when \fI\%mongodump\fP applies to an entire instance and not just a specific database. .UNINDENT .INDENT 0.0 .TP .B \-\-excludeCollection string New in version 3.0. .sp Excludes the specified collection from the \fBmongodump\fP output. To exclude multiple collections, specify the \fI\%\-\-excludeCollection\fP multiple times. .UNINDENT .INDENT 0.0 .TP .B \-\-excludeCollectionsWithPrefix string New in version 3.0. .sp Excludes all collections with a specified prefix from the \fBmongodump\fP outputs. To specify multiple prefixes, specify the \fI\%\-\-excludeCollectionsWithPrefix\fP multiple times. .UNINDENT .INDENT 0.0 .TP .B \-\-numParallelCollections int, \-j int \fIDefault\fP: 4 .sp Number of collections \fBmongodump\fP should export in parallel. .UNINDENT .INDENT 0.0 .TP .B \-\-viewsAsCollections New in version 3.4. .sp When specified, \fBmongodump\fP exports read\-only views as collections. For each view, \fBmongodump\fP will produce a BSON file containing the documents in the view. If you \fBmongorestore\fP the produced BSON file, the view will be restored as a collection\&. .sp If you do \fInot\fP include \fI\%\-\-viewsAsCollections\fP, \fBmongodump\fP captures each view’s metadata. If you include a view’s metadata file in a \fBmongorestore\fP operation, the view is recreated. .UNINDENT .SH EXAMPLES .SS \fBmongodump\fP a Collection .sp The following operation creates a dump file that contains only the collection named \fBcollection\fP in the database named \fBtest\fP\&. In this case the database is running on the local interface on port \fB27017\fP: .INDENT 0.0 .INDENT 3.5 .sp .nf .ft C mongodump \-\-db test \-\-collection collection .ft P .fi .UNINDENT .UNINDENT .SS \fBmongodump\fP a Database Excluding Specified Collections .sp The following operation dumps all collections in the \fBtest\fP database except for \fBusers\fP and \fBsalaries\fP: .INDENT 0.0 .INDENT 3.5 .sp .nf .ft C mongodump \-\-db test \-\-excludeCollection=users \-\-excludeCollection=salaries .ft P .fi .UNINDENT .UNINDENT .SS \fBmongodump\fP with Access Control .sp In the next example, \fI\%mongodump\fP creates a database dump located at \fB/opt/backup/mongodump\-2011\-10\-24\fP, from a database running on port \fB37017\fP on the host \fBmongodb1.example.net\fP and authenticating using the username \fBuser\fP and the password \fBpass\fP, as follows: .INDENT 0.0 .INDENT 3.5 .sp .nf .ft C mongodump \-\-host mongodb1.example.net \-\-port 37017 \-\-username user \-\-password "pass" \-\-out /opt/backup/mongodump\-2011\-10\-24 .ft P .fi .UNINDENT .UNINDENT .SS Output to an Archive File .sp New in version 3.2. .sp To output the dump to an archive file, run \fI\%mongodump\fP with the \fB\-\-archive\fP option and the archive filename. For example, the following operation creates a file \fBtest.20150715.archive\fP that contains the dump of the \fBtest\fP database. .INDENT 0.0 .INDENT 3.5 .sp .nf .ft C mongodump \-\-archive=test.20150715.archive \-\-db test .ft P .fi .UNINDENT .UNINDENT .SS Output an Archive to Standard Output .sp New in version 3.2. .sp To output the archive to the standard output stream in order to pipe to another process, run \fI\%mongodump\fP with the \fBarchive\fP option but \fIomit\fP the filename: .INDENT 0.0 .INDENT 3.5 .sp .nf .ft C mongodump \-\-archive \-\-db test \-\-port 27017 | mongorestore \-\-archive \-\-port 27018 .ft P .fi .UNINDENT .UNINDENT .sp \fBNOTE:\fP .INDENT 0.0 .INDENT 3.5 You cannot use the \fB\-\-archive\fP option with the \fI\%\-\-out\fP option. .UNINDENT .UNINDENT .SS Compress the Output .sp To compress the files in the output dump directory, run \fI\%mongodump\fP with the new \fB\-\-gzip\fP option. For example, the following operation outputs compressed files into the default \fBdump\fP directory. .INDENT 0.0 .INDENT 3.5 .sp .nf .ft C mongodump \-\-gzip \-\-db test .ft P .fi .UNINDENT .UNINDENT .sp To compress the archive file output by \fI\%mongodump\fP, use the \fB\-\-gzip\fP option in conjunction with the \fI\%\-\-archive\fP option, specifying the name of the compressed file. .INDENT 0.0 .INDENT 3.5 .sp .nf .ft C mongodump \-\-archive=test.20150715.gz \-\-gzip \-\-db test .ft P .fi .UNINDENT .UNINDENT .SH AUTHOR MongoDB Documentation Project .SH COPYRIGHT 2008-2018 .\" Generated by docutils manpage writer. .