Add read_scale property to sql database

azurerm/resource_arm_sql_database.go

@@ -291,6 +291,12 @@ func resourceArmSqlDatabase() *schema.Resource {
 				},
 			},
 
+			"read_scale": {
+				Type:     schema.TypeBool,
+				Optional: true,
+				Default:  false,
+			},
+
 			"tags": tagsSchema(),
 		},
 
@@ -415,6 +421,15 @@ func resourceArmSqlDatabaseCreateUpdate(d *schema.ResourceData, meta interface{}
 		}
 	}
 
+	if v, ok := d.GetOk("read_scale"); ok {
+		readScale := v.(bool)
+		if readScale {
+			properties.DatabaseProperties.ReadScale = sql.ReadScaleEnabled
+		} else {
+			properties.DatabaseProperties.ReadScale = sql.ReadScaleDisabled
+		}
+	}
+
 	// The requested Service Objective Name does not match the requested Service Objective Id.
 	if d.HasChange("requested_service_objective_name") && !d.HasChange("requested_service_objective_id") {
 		properties.DatabaseProperties.RequestedServiceObjectiveID = nil
@@ -533,6 +548,13 @@ func resourceArmSqlDatabaseRead(d *schema.ResourceData, meta interface{}) error
 		}
 
 		d.Set("encryption", flattenEncryptionStatus(props.TransparentDataEncryption))
+
+		readScale := props.ReadScale
+		if readScale == sql.ReadScaleEnabled {
+			d.Set("read_scale", true)
+		} else {
+			d.Set("read_scale", false)
+		}
 	}
 
 	flattenAndSetTags(d, resp.Tags)

azurerm/resource_arm_sql_database_test.go

@@ -298,6 +298,36 @@ func TestAccAzureRMSqlDatabase_threatDetectionPolicy(t *testing.T) {
 	})
 }
 
+func TestAccAzureRMSqlDatabase_readScale(t *testing.T) {
+	resourceName := "azurerm_sql_database.test"
+	ri := tf.AccRandTimeInt()
+	location := testLocation()
+	preConfig := testAccAzureRMSqlDatabase_readScale(ri, location, true)
+	postConfig := testAccAzureRMSqlDatabase_readScale(ri, location, false)
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testCheckAzureRMSqlDatabaseDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: preConfig,
+				Check: resource.ComposeTestCheckFunc(
+					testCheckAzureRMSqlDatabaseExists(resourceName),
+					resource.TestCheckResourceAttr(resourceName, "read_scale", "true"),
+				),
+			},
+			{
+				Config: postConfig,
+				Check: resource.ComposeTestCheckFunc(
+					testCheckAzureRMSqlDatabaseExists(resourceName),
+					resource.TestCheckResourceAttr(resourceName, "read_scale", "false"),
+				),
+			},
+		},
+	})
+}
+
 func testCheckAzureRMSqlDatabaseExists(resourceName string) resource.TestCheckFunc {
 	return func(s *terraform.State) error {
 
@@ -789,3 +819,32 @@ resource "azurerm_sql_database" "test" {
 }
 `, rInt, location, rInt, rInt, rInt, state)
 }
+
+func testAccAzureRMSqlDatabase_readScale(rInt int, location string, readScale bool) string {
+	return fmt.Sprintf(`
+resource "azurerm_resource_group" "test" {
+  name     = "readscaletestRG-%d"
+  location = "%s"
+}
+
+resource "azurerm_sql_server" "test" {
+  name                         = "readscaletestsqlserver%d"
+  resource_group_name          = "${azurerm_resource_group.test.name}"
+  location                     = "${azurerm_resource_group.test.location}"
+  version                      = "12.0"
+  administrator_login          = "mradministrator"
+  administrator_login_password = "thisIsDog11"
+}
+
+resource "azurerm_sql_database" "test" {
+  name                = "readscaletestdb%d"
+  resource_group_name = "${azurerm_resource_group.test.name}"
+  server_name         = "${azurerm_sql_server.test.name}"
+  location            = "${azurerm_resource_group.test.location}"
+  edition             = "Premium"
+  collation           = "SQL_Latin1_General_CP1_CI_AS"
+  max_size_bytes      = "1073741824"
+  read_scale		  = %t
+}
+`, rInt, location, rInt, rInt, readScale)
+}

website/docs/r/sql_database.html.markdown

@@ -75,6 +75,8 @@ The following arguments are supported:
 
 * `threat_detection_policy` - (Optional) Threat detection policy configuration. The `threat_detection_policy` block supports fields documented below.
 
+* `read_scale` - (Optional) Read-only connections will be redirected to a high-available replica. Please see [Use read-only replicas to load-balance read-only query workloads](https://docs.microsoft.com/en-us/azure/sql-database/sql-database-read-scale-out).
+
 * `tags` - (Optional) A mapping of tags to assign to the resource.
 
 `import` supports the following: