diff --git a/src/client/src/database.rs b/src/client/src/database.rs
index 528c57632e3b..80dc51df2ef6 100644
--- a/src/client/src/database.rs
+++ b/src/client/src/database.rs
@@ -144,7 +144,7 @@ impl Database {
         let mut request = tonic::Request::new(request);
         let metadata = request.metadata_mut();
         for (key, value) in hints {
-            let key = AsciiMetadataKey::from_bytes(format!("x-greptime-hint:{}", key).as_bytes())
+            let key = AsciiMetadataKey::from_bytes(format!("x-greptime-hint-{}", key).as_bytes())
                 .map_err(|_| {
                 InvalidAsciiSnafu {
                     value: key.to_string(),
diff --git a/src/servers/src/grpc/database.rs b/src/servers/src/grpc/database.rs
index ae7660f3226b..4c3cf2c72b0d 100644
--- a/src/servers/src/grpc/database.rs
+++ b/src/servers/src/grpc/database.rs
@@ -26,7 +26,7 @@ use tonic::{Request, Response, Status, Streaming};
 use crate::grpc::greptime_handler::GreptimeRequestHandler;
 use crate::grpc::{cancellation, TonicResult};
 
-pub const GREPTIME_DB_HEADER_HINT_PREFIX: &str = "x-greptime-hint:";
+pub const GREPTIME_DB_HEADER_HINT_PREFIX: &str = "x-greptime-hint-";
 
 pub(crate) struct DatabaseService {
     handler: GreptimeRequestHandler,
@@ -177,7 +177,11 @@ mod tests {
     #[test]
     fn test_extract_hints() {
         let mut metadata = MetadataMap::new();
-        metadata.insert("x-greptime-hint:append_mode", "true".parse().unwrap());
+        let prev = metadata.insert(
+            "x-greptime-hint-append_mode",
+            MetadataValue::from_static("true"),
+        );
+        assert!(prev.is_none());
         let hints = extract_hints(&metadata);
         assert_eq!(hints, vec![("append_mode".to_string(), "true".to_string())]);
     }
@@ -186,7 +190,7 @@ mod tests {
     fn extract_hints_ignores_non_ascii_metadata() {
         let mut metadata = MetadataMap::new();
         metadata.insert_bin(
-            "x-greptime-hint:merge_mode",
+            "x-greptime-hint-merge_mode-bin",
             MetadataValue::from_bytes(b"last_non_null"),
         );
         let hints = extract_hints(&metadata);
diff --git a/tests-integration/tests/grpc.rs b/tests-integration/tests/grpc.rs
index c3a979d7bfb3..4649bb103835 100644
--- a/tests-integration/tests/grpc.rs
+++ b/tests-integration/tests/grpc.rs
@@ -410,13 +410,13 @@ async fn insert_with_hints_and_assert(db: &Database) {
             InsertRequests {
                 inserts: vec![request],
             },
-            &[("append_mode", "true"), ("merge_mode", "last_non_null")],
+            &[("append_mode", "true")],
         )
         .await;
     assert_eq!(result.unwrap(), 4);
 
     // show table
-    let output = db.sql("SHOW CREATE TABLE demo").await.unwrap();
+    let output = db.sql("SHOW CREATE TABLE demo;").await.unwrap();
 
     let record_batches = match output.data {
         OutputData::RecordBatches(record_batches) => record_batches,
@@ -426,16 +426,23 @@ async fn insert_with_hints_and_assert(db: &Database) {
 
     let pretty = record_batches.pretty_print().unwrap();
     let expected = "\
-+-------+------+--------+-------------------------+
-| host  | cpu  | memory | ts                      |
-+-------+------+--------+-------------------------+
-| host1 | 0.31 | 0.1    | 1970-01-01T00:00:00.100 |
-| host2 |      | 0.2    | 1970-01-01T00:00:00.101 |
-| host3 | 0.41 |        | 1970-01-01T00:00:00.102 |
-| host4 | 0.2  | 0.3    | 1970-01-01T00:00:00.103 |
-| host5 | 66.6 | 1024.0 | 2022-12-28T04:17:07     |
-| host6 | 88.8 | 333.3  | 2022-12-28T04:17:08     |
-+-------+------+--------+-------------------------+\
++-------+-------------------------------------+
+| Table | Create Table                        |
++-------+-------------------------------------+
+| demo  | CREATE TABLE IF NOT EXISTS \"demo\" ( |
+|       |   \"host\" STRING NULL,               |
+|       |   \"cpu\" DOUBLE NULL,                |
+|       |   \"memory\" DOUBLE NULL,             |
+|       |   \"ts\" TIMESTAMP(3) NOT NULL,       |
+|       |   TIME INDEX (\"ts\"),                |
+|       |   PRIMARY KEY (\"host\")              |
+|       | )                                   |
+|       |                                     |
+|       | ENGINE=mito                         |
+|       | WITH(                               |
+|       |   append_mode = 'true'              |
+|       | )                                   |
++-------+-------------------------------------+\
 ";
     assert_eq!(pretty, expected);
 }