SQL Server 2022 Standard Tips & Tricks - Best Practices and Securing your SQL Part 2

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Setting Up Persistent Memory (PMEM)
Persistent Memory (PMEM) allows for faster data access by bypassing the traditional I/O subsystem and directly accessing non-volatile memory devices (e.g., Intel Optane). SQL Server 2022 can leverage PMEM for memory-optimized tables, which can dramatically improve performance for workloads that require fast, persistent storage.
Steps to Set Up Persistent Memory:
1. Verify PMEM Device Availability: Make sure that the server has Persistent Memory devices (such as Intel Optane) installed and properly configured. Use lsblk (Linux) or check the Device Manager (Windows) to confirm the PMEM devices.
2. Configure Persistent Memory for SQL Server: SQL Server 2022 can directly leverage PMEM for memory-optimized tables if the server is configured to use PMEM.
3. Create a Persistent Memory-Optimized Filegroup: You need to create a filegroup in SQL Server that will use persistent memory for data storage.

-- Create a filegroup for persistent memory
ALTER DATABASE SalesDB
ADD FILEGROUP PMEMFileGroup CONTAINS MEMORY_OPTIMIZED_DATA;
GO

-- Add a file for persistent memory (Assume your PMEM device is available at 'C:\PMEM')
ALTER DATABASE SalesDB
ADD FILE (NAME = PMEMFile, FILENAME = 'C:\PMEM\InMemoryData') TO FILEGROUP PMEMFileGroup;
GO

• Configure SQL Server to Use Persistent Memory (PMEM):
• Windows Server: For PMEM, ensure the Persistent Memory Driver is installed (for Intel Optane) and configure the system to use the PMEM device. SQL Server can automatically detect PMEM if it’s configured at the operating system level.
• Linux Server: If using Linux, ensure that the system is configured with DAX (Direct Access) support for PMEM, and that the PMEM devices are mounted correctly.
• Create Memory-Optimized Table Using PMEM: Memory-optimized tables can be created similarly to regular memory-optimized tables, but you specify that the data should be stored on the persistent memory filegroup.

-- Create a memory-optimized table using persistent memory (PMEM)
CREATE TABLE PMEMOptimizedTable (
TransactionID INT PRIMARY KEY NONCLUSTERED,
AccountID INT NOT NULL,
TransactionAmount DECIMAL(18, 2) NOT NULL,
TransactionDate DATETIME2
) WITH (MEMORY_OPTIMIZED = ON, DURABILITY = SCHEMA_AND_DATA, FILEGROUP = PMEMFileGroup);
GO

• FILEGROUP = PMEMFileGroup specifies that this memory-optimized table should use the persistent memory filegroup for storage.
• DURABILITY = SCHEMA_AND_DATA ensures that data is stored persistently in PMEM, making it durable across SQL Server restarts.

Populate and Query the Table:
-- Insert data into the PMEMOptimizedTable
INSERT INTO PMEMOptimizedTable (TransactionID, AccountID, TransactionAmount, TransactionDate)
VALUES
(1, 1001, 250.75, '2024-12-12 10:15:00'),
(2, 1002, 540.50, '2024-12-12 10:30:00');
GO

-- Query the PMEMOptimizedTable
SELECT * FROM PMEMOptimizedTable;
GO