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Frequently Asked Questions

How do I create a namespace in PMEM?

Use ndctl to create a namespace. Namespaces are interleaved across PMEM NVDIMMs and can provide different types of user-space access to memory regions on the device. fsdax is default and desired mode for SQL Server. Note that we have chosen fsdax mode and are using system memory to store per-page metadata.

What is pmpmem support on Linux?

PMEM support on Linux was introduced in SQL Server 2019 preview. SQL Server 2016 introduced support for Non-Volatile DIMMs, and an optimization called Tail of the Log Caching on NVDIMM. These optimizations reduced the number of operations needed to harden a log buffer to persistent storage.

How to configure PMEM device in sqlpal?

This is considered an "enlightened" file access method from the perspective of the host extension application (which is the black box code that allows SQLPAL interact with the Windows or Linux OS). In Linux, use the ndctl utility. Install ndctl to configure PMEM device. You can find it here. Use ndctl to create a namespace.

How to configure PMEM NVDIMM in Linux?

In Linux, use the ndctl utility. Install ndctl to configure PMEM device. You can find it here. Use ndctl to create a namespace. Namespaces are interleaved across PMEM NVDIMMs and can provide different types of user-space access to memory regions on the device. fsdax is default and desired mode for SQL Server.

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