Configure SQL Managed Instance enabled by Azure Arc

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09/19/2024

This article explains how to configure SQL Managed Instance enabled by Azure Arc.

Configure resources such as cores and memory

Configure using CLI

To update the configuration of an instance with the CLI. Run the following command to see configuration options.

az sql mi-arc update --help

To update the available memory and cores for an instance use:

az sql mi-arc update --cores-limit 4 --cores-request 2 --memory-limit 4Gi --memory-request 2Gi -n <NAME_OF_SQL_MI> --k8s-namespace <namespace> --use-k8s

The following example sets the cpu core and memory requests and limits.

az sql mi-arc update --cores-limit 4 --cores-request 2 --memory-limit 4Gi --memory-request 2Gi -n sqlinstance1 --k8s-namespace arc --use-k8s

To view the changes made to the instance, you can use the following commands to view the configuration yaml file:

az sql mi-arc show -n <NAME_OF_SQL_MI> --k8s-namespace <namespace> --use-k8s

Configure readable secondaries

When you deploy SQL Managed Instance enabled by Azure Arc in BusinessCritical service tier with 2 or more replicas, by default, one secondary replica is automatically configured as readableSecondary. This setting can be changed, either to add or to remove the readable secondaries as follows:

az sql mi-arc update --name <sqlmi name>  --readable-secondaries <value> --k8s-namespace <namespace> --use-k8s

For example, the following example resets the readable secondaries to 0.

az sql mi-arc update --name sqlmi1 --readable-secondaries 0 --k8s-namespace mynamespace --use-k8s

Configure replicas

You can also scale up or down the number of replicas deployed in the BusinessCritical service tier as follows:

az sql mi-arc update --name <sqlmi name> --replicas <value> --k8s-namespace <namespace> --use-k8s

For example:

The following example scales down the number of replicas from 3 to 2.

az sql mi-arc update --name sqlmi1 --replicas 2 --k8s-namespace mynamespace --use-k8s

Note

If you scale down from 2 replicas to 1 replica, you might run into a conflict with the pre-configured --readable--secondaries setting. You can first edit the --readable--secondaries before scaling down the replicas.

Configure server options

You can configure certain server configuration settings for SQL Managed Instance enabled by Azure Arc either during or after creation time. This article describes how to configure settings like enabling "Ad Hoc Distributed Queries" or "backup compression default" etc.

Currently the following server options can be configured:

Ad Hoc Distributed Queries
Default Trace Enabled
Database Mail XPs
Backup compression default
Cost threshold for parallelism
Optimize for ad hoc workloads

Note

Currently these options can only be specified via YAML file, either during SQL Managed Instance creation or post deployment.
The SQL managed instance image tag has to be at least version v1.19.x or above.

Add the following to your YAML file during deployment to configure any of these options.

spec:
  serverConfigurations:
  - name: "Ad Hoc Distributed Queries"
    value: 1
  - name: "Default Trace Enabled"
    value: 0
  - name: "Database Mail XPs"
    value: 1
  - name: "backup compression default"
    value: 1
  - name: "cost threshold for parallelism"
    value: 50
  - name: "optimize for ad hoc workloads"
    value: 1

If you already have an existing SQL managed instance enabled by Azure Arc, you can run kubectl edit sqlmi <sqlminame> -n <namespace> and add the above options into the spec.

Example YAML file:

apiVersion: sql.arcdata.microsoft.com/v13
kind: SqlManagedInstance
metadata:
  name: sql1
  annotations:
    exampleannotation1: exampleannotationvalue1
    exampleannotation2: exampleannotationvalue2
  labels:
    examplelabel1: examplelabelvalue1
    examplelabel2: examplelabelvalue2
spec:
  dev: true #options: [true, false]
  licenseType: LicenseIncluded #options: [LicenseIncluded, BasePrice].  BasePrice is used for Azure Hybrid Benefits.
  tier: GeneralPurpose #options: [GeneralPurpose, BusinessCritical]
  serverConfigurations:
  - name: "Ad Hoc Distributed Queries"
    value: 1
  - name: "Default Trace Enabled"
    value: 0
  - name: "Database Mail XPs"
    value: 1
  - name: "backup compression default"
    value: 1
  - name: "cost threshold for parallelism"
    value: 50
  - name: "optimize for ad hoc workloads"
    value: 1
  security:
    adminLoginSecret: sql1-login-secret
  scheduling:
    default:
      resources:
        limits:
          cpu: "2"
          memory: 4Gi
        requests:
          cpu: "1"
          memory: 2Gi
  services:
    primary:
      type: LoadBalancer
  storage:
    backups:
      volumes:
      - className: azurefile # Backup volumes require a ReadWriteMany (RWX) capable storage class
        size: 5Gi
    data:
      volumes:
      - className: default # Use default configured storage class or modify storage class based on your Kubernetes environment
        size: 5Gi
    datalogs:
      volumes:
      - className: default # Use default configured storage class or modify storage class based on your Kubernetes environment
        size: 5Gi
    logs:
      volumes:
      - className: default # Use default configured storage class or modify storage class based on your Kubernetes environment
        size: 5Gi

Enable SQL Server Agent

SQL Server agent is disabled during a default deployment of SQL Managed Instance enabled by Azure Arc. It can be enabled by running the following command:

az sql mi-arc update -n <NAME_OF_SQL_MI> --k8s-namespace <namespace> --use-k8s --agent-enabled true

As an example:

az sql mi-arc update -n sqlinstance1 --k8s-namespace arc --use-k8s --agent-enabled true

Enable trace flags

Trace flags can be enabled as follows:

az sql mi-arc update -n <NAME_OF_SQL_MI> --k8s-namespace <namespace> --use-k8s --trace-flags "3614,1234"

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