InnoDB, as a storage engine for MySQL, does not directly use a "cost threshold for parallelism" setting like SQL Server. The concept of a cost threshold for parallelism is specific to SQL Server and determines the cost at which SQL Server creates and executes parallel query plans. In MySQL and its InnoDB storage engine, parallelism is handled differently and is more focused on aspects like multi-threading for read/write operations, row-level locking, and features that improve concurrency and performance.

However, MySQL and InnoDB have mechanisms to optimize and parallelize operations where possible, such as:

• InnoDB Thread Concurrency: InnoDB allows configuring thread concurrency to optimize CPU usage. You can set the number of threads allowed to run inside InnoDB with the innodb_thread_concurrency parameter. Setting it to 0 allows unlimited threads.

• Parallel Doublewrite Buffer: In MySQL 8.0 and later, the parallel doublewrite buffer feature enhances the efficiency of writing pages back to the disk, indirectly supporting better performance for high-concurrency workloads.

• Parallel Replication: MySQL supports parallel replication, which can apply transactions in parallel on a replica, improving the replication throughput.

• InnoDB Buffer Pool Instances: Multiple buffer pool instances can reduce contention on the buffer pool mutex, improving performance for highly concurrent workloads.

While these features and settings do not directly equate to a "cost threshold for parallelism," they are part of InnoDB's approach to managing and optimizing parallel operations. Tuning these parameters based on your workload can help achieve better performance in environments where parallel processing is beneficial. Always test changes to these settings in a staging environment before applying them to production to gauge their impact on your specific workload.