Indirect Checkpoint And Non-Yielding Scheduler Problems

Parikshit Savjani has a post describing an issue you might experience with indirect checkpoint post SQL Server-2012:

One of the scenarios where skewed distribution of dirty pages in the DPList is common is tempdb. Starting SQL Server 2016, indirect checkpoint is turned ON by default with target_recovery_time set to 60 for model database. Since tempdb database is derived from model during startup, it inherits this property from model database and has indirect checkpoint enabled by default. As a result of the skewed DPList distribution in tempdb, depending on the workload, you may experience excessive spinlock contention and exponential backoffs on DPList on tempdb. In scenarios when the DPList has grown very long, the recovery writer may produce a non-yielding scheduler dump as it iterates through the long list (20k-30k) and tries to acquire spinlock and waits with exponential backoff if spinlock is taken by multiple IOC routines for removal of pages.

This is worth taking a close read.

Related Posts

Reading Drive Files Recursively From T-SQL

Slava Murygin shows how to use a common table expression to read a recursive drive listing: In this blog I’ll use undocumented in SQL Server extended stored procedure “xp_dirtree“. That procedure is well described in Patrick Keisler’s blog. Briefly, “xp_dirtree” extended procedure returns tree of sub-directories from given folder and has three parameters: 1. Starting or root folder […]

Read More

Managing Drives On Linux

David Klee walks through some basics of Linux administration with respect to drives and mountpoints: We see that all four of the drives show up in the list. Because of the nature of how I presented the disks to the VM, the bootable drives (sdd) show up at the end of the chain instead of […]

Read More

Categories

June 2017
MTWTFSS
« May Jul »
 1234
567891011
12131415161718
19202122232425
2627282930