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When PAGELATCH contention exists on one of the allocation bitmap pages in the database, it is possible to reduce the contention on the in-memory pages by adding additional data files, with the same initial size and auto-growth configuration. After the first page, the PFS pages repeat every 8088 pages inside of the data file, the GAM pages repeat every 511,232 pages (every 3994MB known as a GAM interval), and the SGAM pages repeat every 511,232 + 1 pages in the database. The first PFS page occupies PageID 1 of the database, the first GAM page occupies PageID 2, and the first SGAM page occupies PageID 3 in the database.
Apex sql caching too aggressively free#
The allocation bitmap pages are the page free space (PFS), global allocation map (GAM), and shared global allocation map (SGAM) pages in the database. Typically, this happens because of PAGELATCH, in-memory latch contention on the allocation bitmap pages inside of the data files. Because there is only one tempdb database per instance, it often proves to be a bottleneck for those systems that make heavy usage of tempdb. BackgroundĮvery SQL Server has a shared database named tempdb that is for use by temporary objects. After this initial setup, it is best to fine-tune this by monitoring how much contention is taking place in actual service. When you need to configure a SQL Server installation, what is the best way to optimize tempdb for performance? The general advice is that it is possible to minimize the common problem of allocation bitmap contention by setting the initial number of data files for tempdb to a value calculated as a proportion of the number of processors installed in a SQL Server. Optimizing tempdb configuration with SQL Server 2012 Extended Events - Simple Talk