SQL Server 无法运行新的系统任务，原因是内存不足或配置的会话数超过了服务器允许的最大数。请查看服务器是否有足够的内存。请使用 sp_configure 查看服务器允许的最大会话数。请使用 sys.sessions 检查当前会话数，包括用户进程。

SQL Server was unable to run a new system task, either because there is insufficient memory or the number of configured sessions exceeds the maximum allowed in the server. Verify that the server has adequate memory. Use sp_configure to check the maximum number of sessions allowed. Use sys.sessions to check the current number of sessions, including user processes.