.mongoshrc.js

This plugin provides utility functions for the MongoDB mongosh shell, extending its capabilities with additional commands for database administration, log monitoring, and more.

Table of Contents

• Features
• Installation
• Usage
  • Getting Help
  • Functions
    • Utilities
    • Session Management
    • Database and Collection Operations
    • Index Management
    • Profiling and Monitoring
    • Logging and Query Analysis
    • Other Functions
• Contributing
• License

Features

• Extend the MongoDB shell with additional administrative commands.
• Perform batch operations on databases, collections, and indexes.
• Monitor and analyze logs to identify slow queries.
• Manage sessions and monitor profiling settings.
• Custom utilities for common database tasks.

Installation

1. Save the script as .mongoshrc.js in your preferred location.
2. Launch mongosh

mongosh -u <user> "mongodb+srv://server.example.com/"

3. Load the script in the MongoDB shell:

load('/path/to/.mongoshrc.js')

4. The library functions will be available in the MongoDB shell.

Usage

Getting Help

To see the list of available commands, use:

getHelp()

To filter the help output by a specific pattern, provide a regex:

getHelp(/pattern/)

Functions

Utilities

• getHelp(pattern)
  Returns a list of functions matching the specified pattern.

  • Parameters:
    • pattern (String): A regex pattern to filter function names.
  • Returns: Prints the usage information for matching functions.

• splitNameSpace(namespace)
  Splits a namespace into database and collection names.

  • Parameters:
    • namespace (String): The namespace to split (<db>.<col>).
  • Returns: An object with the database and collection names.

Session Management

• listSessions(pattern, options)
  Lists all active sessions, excluding system sessions.

  • Parameters:
    • pattern (Regex): A pattern to search for in session information.
    • options (Object): Options for the $listSessions command. Default is { allUsers: true }.
  • Returns: A list of matching sessions.

• listSessionsBySessionId(pattern, options)
  Lists sessions indexed by session ID.

  • Parameters:
    • pattern (Regex): A pattern to search for in session information.
    • options (Object): Options for the $listSessions command. Default is { allUsers: true }.
  • Returns: Sessions indexed by session ID.

• listSessionsByUserId(pattern, options)
  Lists sessions indexed by user ID.

  • Parameters:
    • pattern (Regex): A pattern to search for in session information.
    • options (Object): Options for the $listSessions command. Default is { allUsers: true }.
  • Returns: Sessions indexed by user ID.

Database and Collection Operations

• getCollection(namespace)
  Gets a collection object based on the provided namespace.

  • Parameters:
    • namespace (String): The namespace of the collection (<db>.<col>).
  • Returns: The collection object.

• getDatabase(database)
  Gets a database object based on the provided name.

  • Parameters:
    • database (String): The name of the database.
  • Returns: The database object.

• dropCollections(nsPattern)
  Drops collections that match a given namespace pattern.

  • Parameters:
    • nsPattern (Regex): A pattern to match collection namespaces.
  • Returns: Results of the drop operation.

• dropDatabases(pattern)
  Drops databases that match the given pattern.

  • Parameters:
    • pattern (Regex): A pattern to match database names.
  • Returns: Results of the drop operation.

• getCollections(nsPattern)
  Retrieves collections matching the specified namespace pattern.

  • Parameters:
    • nsPattern (Regex): Pattern to match namespaces.
  • Returns: A list of collections.

• getEstimatedDocumentCounts(nsPattern)
  Retrieves estimated document counts for collections matching the pattern.

  • Parameters:
    • nsPattern (Regex): Pattern to match namespaces.
  • Returns: Document count estimates.

Index Management

• dropIndexes(nsPattern, idxPattern)
  Drops indexes across namespaces and patterns.

  • Parameters:
    • nsPattern (Regex): Pattern to match namespaces.
    • idxPattern (Regex): Pattern to match index names.
  • Returns: Results of the index drop operation.

• getIndexes(nsPattern, idxPattern)
  Retrieves indexes for namespaces and index patterns.

  • Parameters:
    • nsPattern (Regex): Pattern to match namespaces.
    • idxPattern (Regex): Pattern to match index names.
  • Returns: Index information.

• getIndexStats(nsPattern, idxPattern)
  Retrieves statistics for indexes matching the patterns.

  • Parameters:
    • nsPattern (Regex): Pattern to match namespaces.
    • idxPattern (Regex): Pattern to match index names.
  • Returns: Index statistics.

• getUnusedIndexes(nsPattern)
  Retrieves unused indexes based on the specified pattern.

  • Parameters:
    • nsPattern (Regex): Pattern to match namespaces.
  • Returns: Information on unused indexes.

• getCreateIndexCommands(nsPattern, idxPattern)
  Generates commands to create indexes for the specified patterns.

  • Parameters:
    • nsPattern (Regex): Pattern to match namespaces.
    • idxPattern (Regex): Pattern to match index names.
  • Returns: Index creation commands.

Profiling and Monitoring

• getProfilingStatuses(nsPattern)
  Retrieves profiling statuses for matching namespaces.

  • Parameters:
    • nsPattern (Regex): Pattern to match database names.
  • Returns: Profiling status information.

• setProfilingLevels(nsPattern, level, options)
  Sets profiling levels for matching namespaces.

  • Parameters:
    • nsPattern (Regex): Pattern to match database names.
    • level (Integer): Profiling level.
    • options (Object): Additional options such as slowms.
  • Returns: Results of setting profiling levels.

Logging and Query Analysis

• getLog(logPattern, options)
  Retrieves logs matching a specified pattern.

  • Parameters:
    • logPattern (Regex): Pattern to match log entries.
    • options (Object): Options for log retrieval. Default is { type: 'global' }.
  • Returns: Matching log entries.

• tailLog(logPattern, options)
  Monitors logs for matching entries.

  • Parameters:
    • logPattern (Regex): Pattern to match log entries.
    • options (Object): Options such as run time and entry rate.
  • Returns: Monitored log entries.

• slowQueries(logPattern, options)
  Identifies slow queries in the logs based on a pattern.

  • Parameters:
    • logPattern (Regex): Pattern to match log entries.
    • options (Object): Options such as run time.
  • Returns: Slow query information.

• queryShape(query)
  Generates a shape representation for a query.

  • Parameters:
    • query (Object): The query to analyze.
  • Returns: Query shape.

Other Functions

• watchEstimatedDocumentCounts(nsPattern, sRunTime, msPollTime)
  Monitors changes in document counts for collections.

  • Parameters:
    • nsPattern (Regex): Pattern to match namespaces.
    • sRunTime (Integer): Duration to monitor.
    • msPollTime (Integer): Polling interval in milliseconds.
  • Returns: Changes in document counts.

• changeStream(ns, pipeline, options, eventHandler)
  Executes a change stream and processes events.

  • Parameters:
    • ns (String): The namespace to monitor.
    • pipeline (Array): Filter pipeline for events. options (Object): Options for the change stream. eventHandler (Function): Function to handle events. Returns: Change stream results. Contributing Contributions are welcome! Please submit a pull request or open an issue if you encounter bugs or have suggestions.

License

This project is licensed under the MIT License.