diff --git a/src/models/ManifestValidationSchema.ts b/src/models/ManifestValidationSchema.ts
index a01b694..e5edb4e 100644
--- a/src/models/ManifestValidationSchema.ts
+++ b/src/models/ManifestValidationSchema.ts
@@ -59,7 +59,7 @@ const deploymentValidationSchema = yup.object({
 const databaseValidationSchema = yup.object({
     instanceName: yup.string().required('is Required'),
     sizeInGb: yup.number().required('is Required').min(20).max(500),
-    dbNames: yup.array().of(yup.string().required('is Required')),
+    dbNames: yup.array().of(yup.string().matches(/^[a-z_.]*$/,'Should have alphabets and underscore only').required('is Required')),
 })
 
 const extraResourcesValidationSchema = yup.object({