diff --git a/.changes/next-release/feature-AmazonLookoutforMetrics-7cabe01.json b/.changes/next-release/feature-AmazonLookoutforMetrics-7cabe01.json
new file mode 100644
index 000000000000..754c6c5b7815
--- /dev/null
+++ b/.changes/next-release/feature-AmazonLookoutforMetrics-7cabe01.json
@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "Amazon Lookout for Metrics",
+    "contributor": "",
+    "description": "Allowing uppercase alphabets for RDS and Redshift database names."
+}
diff --git a/services/lookoutmetrics/src/main/resources/codegen-resources/service-2.json b/services/lookoutmetrics/src/main/resources/codegen-resources/service-2.json
index d4f0f641b7f6..c64475534633 100644
--- a/services/lookoutmetrics/src/main/resources/codegen-resources/service-2.json
+++ b/services/lookoutmetrics/src/main/resources/codegen-resources/service-2.json
@@ -2031,7 +2031,7 @@
       "type":"string",
       "max":64,
       "min":1,
-      "pattern":"[a-zA-Z0-9_]+"
+      "pattern":"[a-zA-Z0-9_.]+"
     },
     "RDSSourceConfig":{
       "type":"structure",
@@ -2092,7 +2092,7 @@
       "type":"string",
       "max":100,
       "min":1,
-      "pattern":"[a-z0-9]+"
+      "pattern":"[a-zA-Z0-9_.]+"
     },
     "RedshiftSourceConfig":{
       "type":"structure",