diff --git a/apis/autoscaling/v1alpha1/elasticsearch_webhook.go b/apis/autoscaling/v1alpha1/elasticsearch_webhook.go
index 508c4bffa8..b389fe94cc 100644
--- a/apis/autoscaling/v1alpha1/elasticsearch_webhook.go
+++ b/apis/autoscaling/v1alpha1/elasticsearch_webhook.go
@@ -17,12 +17,15 @@ limitations under the License.
 package v1alpha1
 
 import (
+	"context"
 	"errors"
+	"fmt"
 
 	dbapi "kubedb.dev/apimachinery/apis/kubedb/v1alpha2"
 	opsapi "kubedb.dev/apimachinery/apis/ops/v1alpha1"
 
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/types"
 	"sigs.k8s.io/controller-runtime/pkg/builder"
 	logf "sigs.k8s.io/controller-runtime/pkg/log"
 	"sigs.k8s.io/controller-runtime/pkg/manager"
@@ -116,10 +119,17 @@ func (in *ElasticsearchAutoscaler) validate() error {
 	if in.Spec.DatabaseRef == nil {
 		return errors.New("databaseRef can't be empty")
 	}
-	return nil
-}
 
-func (in *ElasticsearchAutoscaler) ValidateFields(es *dbapi.Elasticsearch) error {
+	var es dbapi.Elasticsearch
+	err := DefaultClient.Get(context.TODO(), types.NamespacedName{
+		Name:      in.Spec.DatabaseRef.Name,
+		Namespace: in.Namespace,
+	}, &es)
+	if err != nil {
+		_ = fmt.Errorf("can't get Elasticsearch %s/%s \n", in.Namespace, in.Spec.DatabaseRef.Name)
+		return err
+	}
+
 	if in.Spec.Compute != nil {
 		cm := in.Spec.Compute
 		if es.Spec.Topology != nil {
diff --git a/apis/autoscaling/v1alpha1/mongodb_webhook.go b/apis/autoscaling/v1alpha1/mongodb_webhook.go
index 50b8c741ac..61bcffad5a 100644
--- a/apis/autoscaling/v1alpha1/mongodb_webhook.go
+++ b/apis/autoscaling/v1alpha1/mongodb_webhook.go
@@ -17,12 +17,15 @@ limitations under the License.
 package v1alpha1
 
 import (
+	"context"
 	"errors"
+	"fmt"
 
 	dbapi "kubedb.dev/apimachinery/apis/kubedb/v1alpha2"
 	opsapi "kubedb.dev/apimachinery/apis/ops/v1alpha1"
 
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/types"
 	"sigs.k8s.io/controller-runtime/pkg/builder"
 	logf "sigs.k8s.io/controller-runtime/pkg/log"
 	"sigs.k8s.io/controller-runtime/pkg/manager"
@@ -50,6 +53,16 @@ func (in *MongoDBAutoscaler) Default() {
 }
 
 func (in *MongoDBAutoscaler) setDefaults() {
+	var db dbapi.MongoDB
+	err := DefaultClient.Get(context.TODO(), types.NamespacedName{
+		Name:      in.Spec.DatabaseRef.Name,
+		Namespace: in.Namespace,
+	}, &db)
+	if err != nil {
+		_ = fmt.Errorf("can't get MongoDB %s/%s \n", in.Namespace, in.Spec.DatabaseRef.Name)
+		return
+	}
+
 	in.setOpsReqOptsDefaults()
 
 	if in.Spec.Storage != nil {
@@ -68,6 +81,14 @@ func (in *MongoDBAutoscaler) setDefaults() {
 		setDefaultComputeValues(in.Spec.Compute.Mongos)
 		setDefaultComputeValues(in.Spec.Compute.Arbiter)
 		setDefaultComputeValues(in.Spec.Compute.Hidden)
+
+		setInMemoryDefaults(in.Spec.Compute.Standalone, db.Spec.StorageEngine)
+		setInMemoryDefaults(in.Spec.Compute.ReplicaSet, db.Spec.StorageEngine)
+		setInMemoryDefaults(in.Spec.Compute.Shard, db.Spec.StorageEngine)
+		setInMemoryDefaults(in.Spec.Compute.ConfigServer, db.Spec.StorageEngine)
+		setInMemoryDefaults(in.Spec.Compute.Mongos, db.Spec.StorageEngine)
+		// no need for Defaulting the Arbiter & Hidden PodResources.
+		// As arbiter is not a data-node.  And hidden doesn't have the impact of storageEngine (it can't be InMemory).
 	}
 }
 
@@ -82,18 +103,6 @@ func (in *MongoDBAutoscaler) setOpsReqOptsDefaults() {
 	}
 }
 
-func (in *MongoDBAutoscaler) SetDefaults(db *dbapi.MongoDB) {
-	if in.Spec.Compute != nil {
-		setInMemoryDefaults(in.Spec.Compute.Standalone, db.Spec.StorageEngine)
-		setInMemoryDefaults(in.Spec.Compute.ReplicaSet, db.Spec.StorageEngine)
-		setInMemoryDefaults(in.Spec.Compute.Shard, db.Spec.StorageEngine)
-		setInMemoryDefaults(in.Spec.Compute.ConfigServer, db.Spec.StorageEngine)
-		setInMemoryDefaults(in.Spec.Compute.Mongos, db.Spec.StorageEngine)
-		// no need for Defaulting the Arbiter & Hidden PodResources.
-		// As arbiter is not a data-node.  And hidden doesn't have the impact of storageEngine (it can't be InMemory).
-	}
-}
-
 // +kubebuilder:webhook:path=/validate-schema-kubedb-com-v1alpha1-mongodbautoscaler,mutating=false,failurePolicy=fail,sideEffects=None,groups=schema.kubedb.com,resources=mongodbautoscalers,verbs=create;update;delete,versions=v1alpha1,name=vmongodbautoscaler.kb.io,admissionReviewVersions={v1,v1beta1}
 
 var _ webhook.Validator = &MongoDBAutoscaler{}
@@ -118,10 +127,16 @@ func (in *MongoDBAutoscaler) validate() error {
 	if in.Spec.DatabaseRef == nil {
 		return errors.New("databaseRef can't be empty")
 	}
-	return nil
-}
+	var mg dbapi.MongoDB
+	err := DefaultClient.Get(context.TODO(), types.NamespacedName{
+		Name:      in.Spec.DatabaseRef.Name,
+		Namespace: in.Namespace,
+	}, &mg)
+	if err != nil {
+		_ = fmt.Errorf("can't get MongoDB %s/%s \n", in.Namespace, in.Spec.DatabaseRef.Name)
+		return err
+	}
 
-func (in *MongoDBAutoscaler) ValidateFields(mg *dbapi.MongoDB) error {
 	if in.Spec.Compute != nil {
 		cm := in.Spec.Compute
 		if mg.Spec.ShardTopology != nil {
@@ -200,5 +215,6 @@ func (in *MongoDBAutoscaler) ValidateFields(mg *dbapi.MongoDB) error {
 			}
 		}
 	}
+
 	return nil
 }
diff --git a/apis/autoscaling/v1alpha1/mysql_webhook.go b/apis/autoscaling/v1alpha1/mysql_webhook.go
index 45e5a20fb3..418dae4741 100644
--- a/apis/autoscaling/v1alpha1/mysql_webhook.go
+++ b/apis/autoscaling/v1alpha1/mysql_webhook.go
@@ -100,7 +100,3 @@ func (in *MySQLAutoscaler) validate() error {
 	}
 	return nil
 }
-
-func (in *MySQLAutoscaler) ValidateFields() error {
-	return nil
-}
diff --git a/apis/autoscaling/v1alpha1/postgres_webhook.go b/apis/autoscaling/v1alpha1/postgres_webhook.go
index 7aea753716..a608b462b0 100644
--- a/apis/autoscaling/v1alpha1/postgres_webhook.go
+++ b/apis/autoscaling/v1alpha1/postgres_webhook.go
@@ -71,9 +71,6 @@ func (in *PostgresAutoscaler) setOpsReqOptsDefaults() {
 	}
 }
 
-func (in *PostgresAutoscaler) SetDefaults() {
-}
-
 // +kubebuilder:webhook:path=/validate-schema-kubedb-com-v1alpha1-postgresautoscaler,mutating=false,failurePolicy=fail,sideEffects=None,groups=schema.kubedb.com,resources=postgresautoscalers,verbs=create;update;delete,versions=v1alpha1,name=vpostgresautoscaler.kb.io,admissionReviewVersions={v1,v1beta1}
 
 var _ webhook.Validator = &PostgresAutoscaler{}
@@ -100,7 +97,3 @@ func (in *PostgresAutoscaler) validate() error {
 	}
 	return nil
 }
-
-func (in *PostgresAutoscaler) ValidateFields() error {
-	return nil
-}
diff --git a/apis/autoscaling/v1alpha1/proxysql_webhook.go b/apis/autoscaling/v1alpha1/proxysql_webhook.go
index 65cc97a399..cf3d107937 100644
--- a/apis/autoscaling/v1alpha1/proxysql_webhook.go
+++ b/apis/autoscaling/v1alpha1/proxysql_webhook.go
@@ -67,9 +67,6 @@ func (in *ProxySQLAutoscaler) setOpsReqOptsDefaults() {
 	}
 }
 
-func (in *ProxySQLAutoscaler) SetDefaults() {
-}
-
 // +kubebuilder:webhook:path=/validate-schema-kubedb-com-v1alpha1-proxysqlautoscaler,mutating=false,failurePolicy=fail,sideEffects=None,groups=schema.kubedb.com,resources=proxysqlautoscalers,verbs=create;update;delete,versions=v1alpha1,name=vproxysqlautoscaler.kb.io,admissionReviewVersions={v1,v1beta1}
 
 var _ webhook.Validator = &ProxySQLAutoscaler{}
@@ -96,7 +93,3 @@ func (in *ProxySQLAutoscaler) validate() error {
 	}
 	return nil
 }
-
-func (in *ProxySQLAutoscaler) ValidateFields() error {
-	return nil
-}
diff --git a/apis/autoscaling/v1alpha1/redis_sentinel_webhook.go b/apis/autoscaling/v1alpha1/redis_sentinel_webhook.go
index 1e82e811c4..c44df8986f 100644
--- a/apis/autoscaling/v1alpha1/redis_sentinel_webhook.go
+++ b/apis/autoscaling/v1alpha1/redis_sentinel_webhook.go
@@ -67,9 +67,6 @@ func (in *RedisSentinelAutoscaler) setOpsReqOptsDefaults() {
 	}
 }
 
-func (in *RedisSentinelAutoscaler) SetDefaults() {
-}
-
 // +kubebuilder:webhook:path=/validate-schema-kubedb-com-v1alpha1-redissentinelautoscaler,mutating=false,failurePolicy=fail,sideEffects=None,groups=schema.kubedb.com,resources=redissentinelautoscalers,verbs=create;update;delete,versions=v1alpha1,name=vredissentinelautoscaler.kb.io,admissionReviewVersions={v1,v1beta1}
 
 var _ webhook.Validator = &RedisSentinelAutoscaler{}
@@ -96,7 +93,3 @@ func (in *RedisSentinelAutoscaler) validate() error {
 	}
 	return nil
 }
-
-func (in *RedisSentinelAutoscaler) ValidateFields() error {
-	return nil
-}
diff --git a/apis/autoscaling/v1alpha1/redis_webhook.go b/apis/autoscaling/v1alpha1/redis_webhook.go
index a86b2beaf0..fba715d3ef 100644
--- a/apis/autoscaling/v1alpha1/redis_webhook.go
+++ b/apis/autoscaling/v1alpha1/redis_webhook.go
@@ -17,12 +17,15 @@ limitations under the License.
 package v1alpha1
 
 import (
+	"context"
 	"errors"
+	"fmt"
 
 	dbapi "kubedb.dev/apimachinery/apis/kubedb/v1alpha2"
 	opsapi "kubedb.dev/apimachinery/apis/ops/v1alpha1"
 
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/types"
 	"sigs.k8s.io/controller-runtime/pkg/builder"
 	logf "sigs.k8s.io/controller-runtime/pkg/log"
 	"sigs.k8s.io/controller-runtime/pkg/manager"
@@ -76,9 +79,6 @@ func (in *RedisAutoscaler) setOpsReqOptsDefaults() {
 	}
 }
 
-func (in *RedisAutoscaler) SetDefaults() {
-}
-
 // +kubebuilder:webhook:path=/validate-schema-kubedb-com-v1alpha1-redisautoscaler,mutating=false,failurePolicy=fail,sideEffects=None,groups=schema.kubedb.com,resources=redisautoscalers,verbs=create;update;delete,versions=v1alpha1,name=vredisautoscaler.kb.io,admissionReviewVersions={v1,v1beta1}
 
 var _ webhook.Validator = &RedisAutoscaler{}
@@ -103,10 +103,17 @@ func (in *RedisAutoscaler) validate() error {
 	if in.Spec.DatabaseRef == nil {
 		return errors.New("databaseRef can't be empty")
 	}
-	return nil
-}
 
-func (in *RedisAutoscaler) ValidateFields(rd *dbapi.Redis) error {
+	var rd dbapi.Redis
+	err := DefaultClient.Get(context.TODO(), types.NamespacedName{
+		Name:      in.Spec.DatabaseRef.Name,
+		Namespace: in.Namespace,
+	}, &rd)
+	if err != nil {
+		_ = fmt.Errorf("can't get Redis %s/%s \n", in.Namespace, in.Spec.DatabaseRef.Name)
+		return err
+	}
+
 	if in.Spec.Compute != nil {
 		cm := in.Spec.Compute
 		if rd.Spec.Mode == dbapi.RedisModeCluster {
diff --git a/apis/autoscaling/v1alpha1/type.go b/apis/autoscaling/v1alpha1/type.go
index 926fd53df6..f95b9f6e97 100644
--- a/apis/autoscaling/v1alpha1/type.go
+++ b/apis/autoscaling/v1alpha1/type.go
@@ -17,11 +17,14 @@ limitations under the License.
 package v1alpha1
 
 import (
+	"sync"
+
 	opsapi "kubedb.dev/apimachinery/apis/ops/v1alpha1"
 
 	core "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	kmapi "kmodules.xyz/client-go/api/v1"
+	"sigs.k8s.io/controller-runtime/pkg/client"
 )
 
 type NodeTopology struct {
@@ -153,3 +156,14 @@ type StatusAccessor interface {
 	GetStatus() AutoscalerStatus
 	SetStatus(_ AutoscalerStatus)
 }
+
+var (
+	once          sync.Once
+	DefaultClient client.Client
+)
+
+func SetDefaultClient(kc client.Client) {
+	once.Do(func() {
+		DefaultClient = kc
+	})
+}