This attribute specifies the maximum number of Arbortext PE 子进程 that the Queued Transaction Scheduler can use to execute queued transactions. By default, this parameter is set to -1, meaning that every Arbortext PE 子进程 in the pool can be allocated to the Queued Transaction Scheduler. If this attribute is set to 0, then no Arbortext PE 子进程 in the pool will ever be allocated to the Queued Transaction Scheduler. You can set maxConcurrentQueuedTransactions to 0 to dedicate the Arbortext PE 子进程 pool to processing only immediate transactions.