Technical Interview Questions
For the WiredTiger storage engine, you can specify the maximum size of the cache that WiredTiger will use for all data. This can be done using storage.wiredTiger.engineConfig.cacheSizeGB option. In MongoDB, WiredTiger is the default storage engine starting from version 3.2. To configure the cache size for WiredTiger, you can use the wiredTiger.cacheSizeGB parameter in the … Read more
No. it is not possible to configure the cache size for MMAPv1 because MMAPv1 does not allow configuring the cache size. In MongoDB, MMAPv1 is a storage engine that uses memory-mapped files for data storage. As of my last knowledge update in January 2022, MMAPv1 does not have a specific cache size configuration like the … Read more
A database profiler is used to collect data about MongoDB write operations, cursors, database commands on a running mongod instance. You can enable profiling on a per-database or per-instance basis. The database profiler writes all the data it collects to the system. profile collection, which is a capped collection. In MongoDB, the profiler is a … Read more
MMAPv1 and WiredTiger are two storage engine used by MongoDB. As of my last knowledge update in January 2022, MongoDB supports multiple storage engines, but the default storage engine has changed over the course of its versions. As of MongoDB 4.0, the WiredTiger storage engine became the default. WiredTiger is known for its performance, scalability, … Read more
A storage engine is the part of a database that is used to manage how data is stored on disk. For example: one storage engine might offer better performance for read-heavy workloads, and another might support a higher-throughput for write operations. In MongoDB, a storage engine is a crucial component responsible for managing the storage … Read more