diff --git a/src/share/stat/ob_opt_stat_monitor_manager.cpp b/src/share/stat/ob_opt_stat_monitor_manager.cpp
index 9872adeff2..3a64f5eda2 100644
--- a/src/share/stat/ob_opt_stat_monitor_manager.cpp
+++ b/src/share/stat/ob_opt_stat_monitor_manager.cpp
@@ -974,9 +974,9 @@ int ObOptStatMonitorManager::clean_useless_dml_stat_info(uint64_t tenant_id)
             share::OB_ALL_MONITOR_MODIFIED_TNAME, all_table_name, share::OB_ALL_DATABASE_TNAME,
             OB_MAX_INNER_TABLE_ID))) {
     LOG_WARN("failed to append fmt", K(ret));
-  } else if (OB_FAIL(delete_part_sql.append_fmt("DELETE FROM %s m WHERE (tenant_id, table_id, tablet_id) IN ( "\
-            "SELECT m.tenant_id, m.table_id, m.tablet_id FROM "\
-            "%s m, %s t, %s db WHERE t.table_id = m.table_id AND t.tenant_id = m.tenant_id AND t.part_level > 0 "\
+  } else if (OB_FAIL(delete_part_sql.append_fmt("DELETE /*+use_nl(m1)*/FROM %s m1 WHERE (tenant_id, table_id, tablet_id) IN ( "\
+            "SELECT /*+leading(db, t, m, view1, view2) use_hash(m) use_hash(view1) use_hash(view2)*/ "\
+            "m.tenant_id, m.table_id, m.tablet_id FROM %s m, %s t, %s db WHERE t.table_id = m.table_id AND t.tenant_id = m.tenant_id AND t.part_level > 0 "\
             "AND t.tenant_id = db.tenant_id AND t.database_id = db.database_id AND db.database_name != '__recyclebin' "\
             "AND NOT EXISTS (SELECT 1 FROM %s p WHERE  p.table_id = m.table_id AND p.tenant_id = m.tenant_id AND p.tablet_id = m.tablet_id) "\
             "AND NOT EXISTS (SELECT 1 FROM %s sp WHERE  sp.table_id = m.table_id AND sp.tenant_id = m.tenant_id AND sp.tablet_id = m.tablet_id)) "\
diff --git a/src/sql/optimizer/ob_log_table_scan.cpp b/src/sql/optimizer/ob_log_table_scan.cpp
index 0c7a6810ef..26f801c225 100644
--- a/src/sql/optimizer/ob_log_table_scan.cpp
+++ b/src/sql/optimizer/ob_log_table_scan.cpp
@@ -1769,6 +1769,10 @@ int ObLogTableScan::print_used_hint(PlanText &plan_text)
                && OpParallelRule::OP_HINT_DOP == get_op_parallel_rule()
                && OB_FAIL(table_hint->parallel_hint_->print_hint(plan_text))) {
       LOG_WARN("failed to print table parallel hint", K(ret));
+    } else if (NULL != table_hint->dynamic_sampling_hint_ &&
+               table_hint->dynamic_sampling_hint_->get_dynamic_sampling() != ObGlobalHint::UNSET_DYNAMIC_SAMPLING &&
+               OB_FAIL(table_hint->dynamic_sampling_hint_->print_hint(plan_text))) {
+      LOG_WARN("failed to print dynamic sampling hint", K(ret));
     } else if (NULL != table_hint->use_das_hint_
                && use_das() == table_hint->use_das_hint_->is_enable_hint()
                && OB_FAIL(table_hint->use_das_hint_->print_hint(plan_text))) {
diff --git a/src/sql/resolver/dml/ob_hint.cpp b/src/sql/resolver/dml/ob_hint.cpp
index 2abf904d91..de91702d85 100644
--- a/src/sql/resolver/dml/ob_hint.cpp
+++ b/src/sql/resolver/dml/ob_hint.cpp
@@ -958,6 +958,7 @@ const char* ObHint::get_hint_name(ObItemType type, bool is_enable_hint /* defaul
     case T_DISTINCT_PUSHDOWN: return is_enable_hint ? "DISTINCT_PUSHDOWN" : "NO_DISTINCT_PUSHDOWN";
     case T_USE_HASH_SET: return is_enable_hint ? "USE_HASH_SET" : "NO_USE_HASH_SET";
     case T_USE_DISTRIBUTED_DML:    return is_enable_hint ? "USE_DISTRIBUTED_DML" : "NO_USE_DISTRIBUTED_DML";
+    case T_TABLE_DYNAMIC_SAMPLING:    return "DYNAMIC_SAMPLING";
     default:                    return NULL;
   }
 }
diff --git a/src/sql/resolver/dml/ob_hint.h b/src/sql/resolver/dml/ob_hint.h
index ad5cc6cdf1..ac45379dca 100644
--- a/src/sql/resolver/dml/ob_hint.h
+++ b/src/sql/resolver/dml/ob_hint.h
@@ -992,7 +992,7 @@ struct ObDDLSchemaVersionHint
 class ObTableDynamicSamplingHint : public ObOptHint
 {
 public:
-  ObTableDynamicSamplingHint(ObItemType hint_type)
+  ObTableDynamicSamplingHint(ObItemType hint_type = T_TABLE_DYNAMIC_SAMPLING)
     : ObOptHint(hint_type), dynamic_sampling_(ObGlobalHint::UNSET_DYNAMIC_SAMPLING), sample_block_cnt_(0)
   {
     set_hint_class(HINT_TABLE_DYNAMIC_SAMPLING);