The system tablespace is the storage area for the InnoDB data dictionary. MySQL stores the InnoDB table in different tablespaces, based on the configuration you provide during the table creation. Servers on general purpose storage v2 (supporting up to 16 TB) Pricing tier Servers on general purpose storage v1 (supporting up to 4 TB) Pricing tier Review the MySQL documentation to learn more about this parameter. Row-based binary logging helps maintain security, and binary logging can't break, so you can safely set log_bin_trust_function_creators to TRUE. The binary logging format is always ROW, and all connections to the server always use row-based binary logging. If you want to use triggers, you get an error similar to the following: You do not have the SUPER privilege and binary logging is enabled (you might want to use the less safe log_bin_trust_function_creators variable). In Azure Database for MySQL, binary logs are always enabled (the log_bin parameter is set to ON). thread_pool_batch_max_time: This value determines the maximum time a thread will repeat the cycle of query execution and waiting for the next query.ĭon't turn on the thread pool in production until you've tested it.thread_pool_batch_wait_timeout: This value specifies the time a thread waits for another query to process.You determine the behavior of batch execution by using the following server parameters: This process continues until the overall time spent exceeds a threshold. The thread then runs the query rapidly and, when this is complete, the thread waits for the next one. Instead of returning back to the thread pool immediately after running a query, threads will keep active for a short time to wait for the next query through this connection. To improve performance issues of short queries on the thread pool, you can enable batch execution. thread_pool_min_threads: This value sets the number of threads that are reserved, even after connections are closed.thread_pool_max_threads: This value limits the number of threads in the pool.You can also configure the maximum and minimum number of threads in the pool by setting the following server parameters: This is a static parameter, and requires a server restart to apply. By default, this parameter is set to one-thread-per-connection, which means MySQL creates a new thread for each new connection. To enable a thread pool, update the thread_handling server parameter to pool-of-threads. Thread pools aren't supported for MySQL 5.6. Thread pools are most efficient for short queries and CPU intensive workloads, such as OLTP workloads.įor more information, see Introducing thread pools in Azure Database for MySQL. This helps ensure that a burst of connections doesn't cause the server to run out of resources or memory. You use this feature to limit the number of active threads running on the server and minimize thread churn. Thread pools, a server-side feature and distinct from connection pooling, maximize performance by introducing a dynamic pool of worker threads. Many active threads can affect the performance significantly, due to increased context switching, thread contention, and bad locality for CPU caches. As the number of concurrent users grows, there's a corresponding drop in performance. MySQL traditionally assigns a thread for every client connection. The limits are determined by the pricing tier and vCores of the server. Refer to the following sections to learn more about the limits of several commonly updated server parameters. In the Azure portal, use the server parameters tab to view the full list and configure server parameters values. The list of supported server parameters is constantly growing. Some parameters can be set dynamically during runtime, while others are static, and require a server restart in order to apply.Īzure Database for MySQL exposes the ability to change the value of various MySQL server parameters by using the Azure portal, the Azure CLI, and PowerShell to match your workload's needs. The MySQL engine provides many different server variables and parameters that you use to configure and tune engine behavior. This article provides considerations and guidelines for configuring server parameters in Azure Database for MySQL. For more information about migrating to Azure Database for MySQL - Flexible Server, see What's happening to Azure Database for MySQL Single Server? We strongly recommend for you to upgrade to Azure Database for MySQL - Flexible Server. Azure Database for MySQL - Single Server is on the retirement path.
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