diff --git a/deps/oblib/src/lib/utility/ob_tracepoint_def.h b/deps/oblib/src/lib/utility/ob_tracepoint_def.h
index 6d22c0161..d927afcc5 100644
--- a/deps/oblib/src/lib/utility/ob_tracepoint_def.h
+++ b/deps/oblib/src/lib/utility/ob_tracepoint_def.h
@@ -466,6 +466,7 @@ GLOBAL_ERRSIM_POINT_DEF(761, EN_FAST_RECLAIM_THREAD, "used to speed up reclaimin
 GLOBAL_ERRSIM_POINT_DEF(800, EN_END_PARTICIPANT, "");
 
 // compaction 801 - 899
+GLOBAL_ERRSIM_POINT_DEF(801, EN_FORCE_PARALLEL_MINI_MERGE, "used to force set parallel degree for mini merge");
 
 // compaction 801 - 899
 //LS Migration Related 900 - 1000
diff --git a/src/objit/src/ob_llvm_di_helper.cpp b/src/objit/src/ob_llvm_di_helper.cpp
index bc14135f4..167e5589b 100644
--- a/src/objit/src/ob_llvm_di_helper.cpp
+++ b/src/objit/src/ob_llvm_di_helper.cpp
@@ -431,9 +431,9 @@ ObLLVMDIHelper::ObDIBasicTypeAttr ObLLVMDIHelper::basic_type_[common::ObMaxType]
   {"tinyint unsigned",    8,  8, llvm::dwarf::DW_ATE_unsigned},
   {"smallint unsigned",  16, 16, llvm::dwarf::DW_ATE_unsigned},
   {"mediumint unsigned", 32, 32, llvm::dwarf::DW_ATE_unsigned},
-  {"int unsigned",       32, 32, llvm::dwarf::DW_ATE_unsigned},
-  {"bigint unsigned",    64, 64, llvm::dwarf::DW_ATE_unsigned},
-  {"float",  32, 32, llvm::dwarf::DW_ATE_float},
+  {"int unsigned",       32, 32, llvm::dwarf::DW_ATE_unsigned},
+  {"bigint unsigned",    64, 64, llvm::dwarf::DW_ATE_unsigned},
+  {"float",  32, 32, llvm::dwarf::DW_ATE_float},
   {"double", 64, 64, llvm::dwarf::DW_ATE_float},
   {"float unsigned",  32, 32, llvm::dwarf::DW_ATE_float},
   {"double unsigned", 64, 64, llvm::dwarf::DW_ATE_float},
diff --git a/src/storage/compaction/ob_partition_parallel_merge_ctx.cpp b/src/storage/compaction/ob_partition_parallel_merge_ctx.cpp
index 281219463..ad57cb689 100644
--- a/src/storage/compaction/ob_partition_parallel_merge_ctx.cpp
+++ b/src/storage/compaction/ob_partition_parallel_merge_ctx.cpp
@@ -260,6 +260,22 @@ int ObParallelMergeCtx::init_parallel_major_merge(compaction::ObBasicTabletMerge
   return ret;
 }
 
+#ifdef ERRSIM
+void errsim_set_prallel_cnt(const int64_t parallel_merge_cnt, int64_t &concurrent_cnt)
+{
+  /* alter system set_tp tp_no = 801, error_code = 3, frequency = 1;
+   * error_code = 3, then the parallel degree of mini merge will be 3
+  */
+  int ret = OB_SUCCESS;
+  ret = OB_E(EventTable::EN_FORCE_PARALLEL_MINI_MERGE) ret;
+  if (OB_FAIL(ret)) {
+    concurrent_cnt = MIN(-ret, parallel_merge_cnt);
+    ret = OB_SUCCESS;
+    STORAGE_LOG(INFO, "ERRSIM EN_FORCE_PARALLEL_MINI_MERGE, force set parallel degree for mini merge", K(concurrent_cnt));
+  }
+}
+#endif
+
 int ObParallelMergeCtx::init_parallel_mini_merge(compaction::ObBasicTabletMergeCtx &merge_ctx)
 {
   int ret = OB_SUCCESS;
@@ -284,6 +300,13 @@ int ObParallelMergeCtx::init_parallel_mini_merge(compaction::ObBasicTabletMergeC
                                   (total_bytes + ObCompactionEstimator::MINI_PARALLEL_BASE_MEM - 1) / ObCompactionEstimator::MINI_PARALLEL_BASE_MEM,
                                   concurrent_cnt_);
 
+#ifdef ERRSIM
+  if (concurrent_cnt_ <= 1) {
+    (void )errsim_set_prallel_cnt(PARALLEL_MERGE_TARGET_TASK_CNT, concurrent_cnt_);
+  }
+#endif
+
+
     ObArray<ObStoreRange> store_ranges;
     store_ranges.set_attr(lib::ObMemAttr(MTL_ID(), "TmpMiniRanges", ObCtxIds::MERGE_NORMAL_CTX_ID));