Troubleshooting Table I/O with SYS Schema in MySQL 8

MySQL 8 performance monitoring helps proactive troubleshooting by providing real-time data and insights into the performance of the database system. By monitoring performance, administrators can proactively identify and resolve potential performance issues before they become major problems. This helps to maintain high levels of availability and performance for applications that rely on the database.

MySQL 8 provides several performance monitoring tools and techniques that can be used to track and diagnose performance issues. Some of these tools include the Performance / SYS Schema, the Performance Dashboard, the MySQL Enterprise Monitor, several other SaaS performance monitoring infrastructure and the mysqladmin command-line utility. These tools provide detailed information on the performance of the database system, including query execution time, I/O operations, memory usage, and lock wait time.

By monitoring these performance metrics, administrators can identify performance bottlenecks and resolve them by optimizing database configuration, indexing, and query performance. Additionally, performance monitoring can help administrators understand how their applications are using the database, enabling them to make informed decisions about capacity planning and database resource allocation.

Overall, implementing MySQL 8 performance monitoring can help to ensure the long-term health and stability of the database system, reducing downtime and improving performance for end-users.

MySQL 8 provides several table I/O related views to monitor and diagnose performance issues:

  1. Innodb_buffer_pool_pages_data: This view displays the number of pages in the buffer pool containing data pages.
  2. Innodb_buffer_pool_pages_free: This view displays the number of free pages in the buffer pool.
  3. Innodb_buffer_pool_pages_dirty: This view displays the number of dirty pages in the buffer pool.
  4. Innodb_buffer_pool_pages_flushed: This view displays the number of pages flushed from the buffer pool.
  5. Innodb_buffer_pool_pages_misc: This view displays the number of pages in the buffer pool that are used for miscellaneous purposes, such as the adaptive hash index or row locks.
  6. Innodb_buffer_pool_pages_total: This view displays the total number of pages in the buffer pool.
  7. Innodb_data_read: This view displays the number of data pages read from disk into the buffer pool.
  8. Innodb_data_written: This view displays the number of data pages written from the buffer pool to disk.
  9. Innodb_dblwr_pages_written: This view displays the number of doublewrite buffer pages written to disk.
  10. Innodb_dblwr_writes: This view displays the number of doublewrite buffer write operations performed.
  11. Innodb_os_log_fsyncs: This view displays the number of fsync() operations performed on the transaction log.
  12. Innodb_os_log_pending_fsyncs: This view displays the number of pending fsync() operations on the transaction log.

These views can be used to monitor and diagnose I/O related performance issues in your MySQL 8 database, as well as to track the overall performance of the buffer pool, the data read and written, the doublewrite buffer, and the transaction log.

About Shiv Iyer 422 Articles
Open Source Database Systems Engineer with a deep understanding of Optimizer Internals, Performance Engineering, Scalability and Data SRE. Shiv currently is the Founder, Investor, Board Member and CEO of multiple Database Systems Infrastructure Operations companies in the Transaction Processing Computing and ColumnStores ecosystem. He is also a frequent speaker in open source software conferences globally.