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Storage Engine and Version

Last updated: 2022-04-08 10:10:22

    This document describes the storage engines and version information of TencentDB for MongoDB to help you select appropriate options.

    Storage Engine

    TencentDB for MongoDB supports WiredTiger and Rocks storage engines.

    WiredTiger

    With a typical Btree structure, WiredTiger greatly outperforms MMAPv1, MongoDB's legacy storage engine. It provides concurrency control and compression mechanisms at different granularities, significantly reducing the storage costs. It offers the optimal performance and storage efficiency for different types of applications. MongoDB 3.2 uses WiredTiger as the default storage engine.

    Rocks

    Rocks organizes data based on the log-structured merge-tree (LSM tree) structure and specifically optimizes data write capabilities, which guarantee constantly efficient data writes and make it suitable for scenarios involving more writes but fewer reads. It is supported by MongoDB 3.2 only.

    Version Storage Engine
    3.2
  • WiredTiger
  • Rocks
  • 3.6 WiredTiger
    4.0 WiredTiger
    4.2 WiredTiger

    Version Description

    Feature Subfeature 3.2 3.6 4.0 4.2
    Network Classic network Supported Supported Supported Supported
    VPC Supported Supported Supported Supported
    Security group Supported Supported Supported Supported
    Network change Supported Supported Supported Supported
    Sale
    Pay-as-You-Go Supported Supported Supported Supported
    Batch renewal Supported Supported Supported Supported
    Pay-as-You-Go instance termination Supported Supported Supported Supported
    Message subscription and notification Supported Supported Supported Supported
    Elasticity Configuration adjustment Supported Supported Supported Supported
    Node quantity adjustment Supported Supported Supported Not supported
    Adjustment of node quantity per shard Supported Supported Supported Not supported
    Shard quantity adjustment Not supported Supported Supported Not supported
    Instance operation Instance list Supported Supported Supported Supported
    Restart an instance Supported Supported Supported Supported
    Batch instance restart Supported Supported Supported Supported
    Instance termination Supported Supported Supported Supported
    Switch to another project Supported Supported Supported Supported
    Tag management Supported Supported Supported Supported
    Password resetting Supported Supported Supported Supported
    Unauthorized access Not supported Supported Supported Not supported
    Maintenance time modification Supported Supported Supported Supported
    Read-Only Instance Supported Supported Supported Supported
    Recovery Instance Supported Supported Supported Supported
    System monitoring Monitoring metric list Supported Supported Supported Supported
    Data comparison Supported Supported Supported Supported
    Alarm rule configuration Supported Supported Supported Supported
    Monitoring data export Supported Supported Supported Supported
    Multi-Instance comparison and monitoring Supported Supported Supported Supported
    Backup and rollback Backup list Supported Supported Supported Supported
    Manual backup Supported Supported Supported Supported
    Automatic backup Supported Supported Supported Supported
    Backup file download Supported Supported Supported Supported
    Instance clone Supported Supported Supported Supported
    Database table rollback (replica set) Supported Supported Supported Supported
    Database table rollback (sharded cluster) Not supported Not supported Not supported Not supported
    Automatic backup policy configuration Supported Supported Supported Supported
    Database management Create an account Supported Supported Supported Supported
    Account password change Supported Supported Supported Supported
    Account permission configuration Supported Supported Supported Supported
    Slow log query Supported Supported Supported Supported
    Slow log request management Supported Supported Supported Supported
    Slow log download Supported Supported Supported Supported
    Connection management Supported Supported Supported Supported
    Task management List data loading Supported Supported Supported Supported
    Filter by time Supported Supported Supported Supported
    Filter by instance name Supported Supported Supported Supported
    Task details display Supported Supported Supported Supported
    Database audit Instance audit Not supported Not supported Supported Not supported
    Audit log Not supported Not supported Supported Not supported
    Recycle bin Instance list in recycle bin Supported Supported Supported Supported
    Instance restoration Supported Supported Supported Supported
    Batch instance restoration Supported Supported Supported Supported
    Instance elimination Supported Supported Supported Supported
    Migration Migration over public network Supported Supported Supported Supported
    Self-Build on CVM Supported Supported Supported Supported
    Migration over Direct Connect Supported Supported Supported Supported
    Migration over VPN Supported Supported Supported Supported
    TencentDB migration Supported Supported Supported Supported
    Migration over CCN Supported Supported Supported Supported
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