diff --git a/source/dnode/vnode/src/tsdb/tsdbCommit2.c b/source/dnode/vnode/src/tsdb/tsdbCommit2.c
index 170700aeb863a7039884fadfd24b7a33f4f6b3ec..8a9dbf37b9b4ffb2691024cea8d6ff6f9436d001 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCommit2.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit2.c
@@ -108,6 +108,7 @@ static int32_t tsdbCommitCloseWriter(SCommitter2 *committer) {
 static int32_t tsdbCommitTSData(SCommitter2 *committer) {
   int32_t   code = 0;
   int32_t   lino = 0;
+  int64_t   numOfRow = 0;
   SMetaInfo info;
 
   committer->ctx->hasTSData = false;
@@ -135,6 +136,7 @@ static int32_t tsdbCommitTSData(SCommitter2 *committer) {
     }
 
     committer->ctx->hasTSData = true;
+    numOfRow++;
 
     code = tsdbFSetWriteRow(committer->writer, row);
     TSDB_CHECK_CODE(code, lino, _exit);
@@ -146,6 +148,8 @@ static int32_t tsdbCommitTSData(SCommitter2 *committer) {
 _exit:
   if (code) {
     TSDB_ERROR_LOG(TD_VID(committer->tsdb->pVnode), lino, code);
+  } else {
+    tsdbDebug("vgId:%d fid:%d commit %" PRId64 " rows", TD_VID(committer->tsdb->pVnode), committer->ctx->fid, numOfRow);
   }
   return code;
 }
@@ -153,6 +157,7 @@ _exit:
 static int32_t tsdbCommitTombData(SCommitter2 *committer) {
   int32_t   code = 0;
   int32_t   lino = 0;
+  int64_t   numRecord = 0;
   SMetaInfo info;
 
   if (committer->ctx->fset == NULL && !committer->ctx->hasTSData) {
@@ -187,6 +192,7 @@ static int32_t tsdbCommitTombData(SCommitter2 *committer) {
     record->skey = TMAX(record->skey, committer->ctx->minKey);
     record->ekey = TMIN(record->ekey, committer->ctx->maxKey);
 
+    numRecord++;
     code = tsdbFSetWriteTombRecord(committer->writer, record);
     TSDB_CHECK_CODE(code, lino, _exit);
 
@@ -198,6 +204,9 @@ static int32_t tsdbCommitTombData(SCommitter2 *committer) {
 _exit:
   if (code) {
     TSDB_ERROR_LOG(TD_VID(committer->tsdb->pVnode), lino, code);
+  } else {
+    tsdbDebug("vgId:%d fid:%d commit %" PRId64 " tomb records", TD_VID(committer->tsdb->pVnode), committer->ctx->fid,
+              numRecord);
   }
   return code;
 }
diff --git a/source/dnode/vnode/src/tsdb/tsdbDataFileRW.c b/source/dnode/vnode/src/tsdb/tsdbDataFileRW.c
index 53db3b49cd27e93163c2b7546e01ba9a8689b83c..9d07bcb446285696f4ebb6085028075c7ce12b6f 100644
--- a/source/dnode/vnode/src/tsdb/tsdbDataFileRW.c
+++ b/source/dnode/vnode/src/tsdb/tsdbDataFileRW.c
@@ -703,6 +703,15 @@ int32_t tsdbFileWriteBrinBlock(STsdbFD *fd, SBrinBlock *brinBlock, int8_t cmprAl
     *fileSize += brinBlk->size[j];
   }
 
+#if 0
+  SBrinRecord record;
+  for (int32_t i = 0; i < BRIN_BLOCK_SIZE(brinBlock); i++) {
+    tBrinBlockGet(brinBlock, i, &record);
+    tsdbInfo("write brin block, block num:%04d, idx:%04d suid:%ld, uid:%ld, offset:%ld, numRow:%d, count:%d",
+             TARRAY2_SIZE(brinBlkArray), i, record.suid, record.uid, record.blockOffset, record.numRow, record.count);
+  }
+#endif
+
   // append to brinBlkArray
   code = TARRAY2_APPEND_PTR(brinBlkArray, brinBlk);
   if (code) return code;
diff --git a/source/dnode/vnode/src/tsdb/tsdbMerge.c b/source/dnode/vnode/src/tsdb/tsdbMerge.c
index a6de924c2191ff5d03d2297f3ba8194fe5c52107..ec0ea3c60ffa1c8ef0a5564dcdb2e2f59bd6935a 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMerge.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMerge.c
@@ -107,6 +107,7 @@ static int32_t tsdbMergeFileSetBeginOpenReader(SMerger *merger) {
   merger->ctx->toData = true;
   merger->ctx->level = 0;
 
+  // TODO: optimize merge strategy
   for (int32_t i = 0;; ++i) {
     if (i >= TARRAY2_SIZE(merger->ctx->fset->lvlArr)) {
       merger->ctx->lvl = NULL;
@@ -150,6 +151,8 @@ static int32_t tsdbMergeFileSetBeginOpenReader(SMerger *merger) {
 
       code = TARRAY2_APPEND(merger->sttReaderArr, reader);
       TSDB_CHECK_CODE(code, lino, _exit);
+
+      numFile++;
     }
   }
 
@@ -354,10 +357,9 @@ static int32_t tsdbMergeFileSet(SMerger *merger, STFileSet *fset) {
   }
 
   // tomb
-  STombRecord *record;
   merger->ctx->tbid->suid = 0;
   merger->ctx->tbid->uid = 0;
-  while ((record = tsdbIterMergerGetTombRecord(merger->tombIterMerger)) != NULL) {
+  for (STombRecord *record; (record = tsdbIterMergerGetTombRecord(merger->tombIterMerger)) != NULL;) {
     if (record->uid != merger->ctx->tbid->uid) {
       merger->ctx->tbid->uid = record->uid;
       merger->ctx->tbid->suid = record->suid;