What are the advantages and disadvantages of MyBatis first-level cache and second-level cache?

2 years ago
Benjamin Taylor
2 minutes

MyBatis is a persistence framework that offers first-level and second-level caching to improve performance. Here are their advantages and disadvantages:

Primary cache:
Advantages:

  1. It is enabled by default and does not require any additional configuration.
  2. The first-level cache is effective within the same session, reducing the number of database interactions and improving performance.
  3. Improved the response speed and concurrency capabilities of the system.

Drawbacks:

  1. The first-level cache is only effective within the same session and does not work for queries across sessions.
  2. Because cache is stored in memory, if the amount of data being operated on is large, it can lead to high memory usage, affecting the stability of the system.
  3. The first-level cache is based on references, which means that if an object is modified within the same session, it may also affect the object in the cache, potentially causing dirty data issues.

Advantages of secondary cache:

  1. The second-level cache is session-independent, allowing cache data to be shared across different sessions.
  2. Reduced the number of database interactions, improving performance.
  3. By configuring the cache refresh strategy, it ensures that cached data is updated in a timely manner.

drawback

  1. The secondary cache needs to be manually activated and configured.
  2. Caching data in memory can lead to excessive memory usage, impacting the stability of the system.
  3. Frequent modifications to data can potentially lead to issues with dirty data.
  4. Due to the shared nature of data, it may lead to issues with data consistency.

In conclusion, both the primary cache and secondary cache have their own advantages and disadvantages, and the selection and configuration should be based on the specific business needs and system characteristics.

bannerAds