diff --git a/src/common/meta/src/kv_backend/chroot.rs b/src/common/meta/src/kv_backend/chroot.rs
index 6f097cd83e..0cadc7b346 100644
--- a/src/common/meta/src/kv_backend/chroot.rs
+++ b/src/common/meta/src/kv_backend/chroot.rs
@@ -45,6 +45,10 @@ impl TxnService for ChrootKvBackend {
         let txn_res = self.inner.txn(txn).await?;
         Ok(self.chroot_txn_response(txn_res))
     }
+
+    fn max_txn_ops(&self) -> usize {
+        self.inner.max_txn_ops()
+    }
 }
 
 #[async_trait::async_trait]
diff --git a/src/common/meta/src/kv_backend/memory.rs b/src/common/meta/src/kv_backend/memory.rs
index 90a79d4456..bb8cf2d95d 100644
--- a/src/common/meta/src/kv_backend/memory.rs
+++ b/src/common/meta/src/kv_backend/memory.rs
@@ -323,6 +323,10 @@ impl<T: ErrorExt + Send + Sync> TxnService for MemoryKvBackend<T> {
             responses,
         })
     }
+
+    fn max_txn_ops(&self) -> usize {
+        usize::MAX
+    }
 }
 
 impl<T: ErrorExt + Send + Sync + 'static> ResettableKvBackend for MemoryKvBackend<T> {
diff --git a/src/common/meta/src/kv_backend/txn.rs b/src/common/meta/src/kv_backend/txn.rs
index f5db5a5cdb..c170b93fbe 100644
--- a/src/common/meta/src/kv_backend/txn.rs
+++ b/src/common/meta/src/kv_backend/txn.rs
@@ -30,7 +30,7 @@ pub trait TxnService: Sync + Send {
 
     /// Maximum number of operations permitted in a transaction.
     fn max_txn_ops(&self) -> usize {
-        usize::MAX
+        unimplemented!("txn is not implemented")
     }
 }
 
diff --git a/src/log-store/src/raft_engine/backend.rs b/src/log-store/src/raft_engine/backend.rs
index ab2f9896f9..86d6ae39d7 100644
--- a/src/log-store/src/raft_engine/backend.rs
+++ b/src/log-store/src/raft_engine/backend.rs
@@ -152,6 +152,10 @@ impl TxnService for RaftEngineBackend {
             responses,
         })
     }
+
+    fn max_txn_ops(&self) -> usize {
+        usize::MAX
+    }
 }
 
 #[async_trait::async_trait]
diff --git a/src/meta-srv/src/service/store/cached_kv.rs b/src/meta-srv/src/service/store/cached_kv.rs
index af9e0a5cec..df898164d1 100644
--- a/src/meta-srv/src/service/store/cached_kv.rs
+++ b/src/meta-srv/src/service/store/cached_kv.rs
@@ -380,6 +380,10 @@ impl TxnService for LeaderCachedKvBackend {
 
         Ok(res)
     }
+
+    fn max_txn_ops(&self) -> usize {
+        self.store.max_txn_ops()
+    }
 }
 
 impl ResettableKvBackend for LeaderCachedKvBackend {