摘要： fromhttp://www.akadia.com/services/ora_chained_rows.htmlOverviewIf you notice poor performance in your Oracle database Row Chaining and Migration may ... 阅读全文

摘要： fromhttp://social.msdn.microsoft.com/Forums/sqlserver/en-US/1901f6e1-2dc3-4763-874d-d5420345eb3f/processor-could-not-start-the-necessary-thread-resources-for-parallel-query-execution?forum=sqldatabaseengineYou should changethe SQL Server's "Max degree of parallelism"setting from 0(defa 阅读全文

摘要： ProblemI have a busy SQL Server and notice that several queries are running in parallel. I know I can set the max degree of parallelism setting, but what MAXDOP should I use?SolutionThe purpose of this article is to share with the community a discussion I had with a Microsoft PFE (Premier Field Engi 阅读全文

摘要： I was working on an index build issue for an 80 CPU system and kept seeing that only 64 CPUs were getting used. I had carefully studied sys.dm_os_spinlock_stats and sys.dm_os_wait_stats along with performance counters, memory usage pattern, and I/O activities. In fact, I had an 80 CPU, 2TB RAM, 4TB 阅读全文