diff --git a/source/dnode/vnode/src/tsdb/tsdbCommit.c b/source/dnode/vnode/src/tsdb/tsdbCommit.c
index b8af4d9d286cc339716aa8da1f1bc4685b0fb792..d3b82db3e971d9223274ce64dc852dd43bba6be2 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCommit.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit.c
@@ -32,7 +32,6 @@ typedef struct {
   int8_t      type;
   union {
     struct {
-      SArray     *aTbDataP;
       int32_t     iTbDataP;
       STbDataIter iter;
     };  // memory data iter
@@ -75,6 +74,7 @@ typedef struct {
   struct {
     SDataIter *pIter;
     SRBTree    rbt;
+    SDataIter  aDataIter[TSDB_MAX_LAST_FILE + 1];
   };
   struct {
     SDataFWriter *pWriter;
@@ -102,6 +102,26 @@ static int32_t tsdbCommitData(SCommitter *pCommitter);
 static int32_t tsdbCommitDel(SCommitter *pCommitter);
 static int32_t tsdbCommitCache(SCommitter *pCommitter);
 static int32_t tsdbEndCommit(SCommitter *pCommitter, int32_t eno);
+static int32_t tsdbNextCommitRow(SCommitter *pCommitter);
+
+static int32_t tRowInfoCmprFn(const void *p1, const void *p2) {
+  SRowInfo *pInfo1 = (SRowInfo *)p1;
+  SRowInfo *pInfo2 = (SRowInfo *)p2;
+
+  if (pInfo1->suid < pInfo2->suid) {
+    return -1;
+  } else if (pInfo1->suid > pInfo2->suid) {
+    return 1;
+  }
+
+  if (pInfo1->uid < pInfo2->uid) {
+    return -1;
+  } else if (pInfo1->uid > pInfo2->uid) {
+    return 1;
+  }
+
+  return tsdbRowCmprFn(&pInfo1->row, &pInfo2->row);
+}
 
 int32_t tsdbBegin(STsdb *pTsdb) {
   int32_t code = 0;
@@ -376,6 +396,49 @@ _exit:
   return code;
 }
 
+static int32_t tsdbOpenCommitIter(SCommitter *pCommitter) {
+  int32_t code = 0;
+
+  tRBTreeCreate(&pCommitter->rbt, tRowInfoCmprFn);
+  pCommitter->pIter = NULL;
+
+  int8_t iIter = 0;
+  // memory
+  SDataIter *pIter = &pCommitter->aDataIter[iIter];
+  pIter->type = 0;
+  pIter->iTbDataP = 0;
+  for (; pIter->iTbDataP < taosArrayGetSize(pCommitter->aTbDataP); pIter->iTbDataP++) {
+    STbData *pTbData = (STbData *)taosArrayGetP(pCommitter->aTbDataP, pIter->iTbDataP);
+    TSDBKEY  tKey = {.ts = pCommitter->minKey, .version = VERSION_MIN};
+    tsdbTbDataIterOpen(pTbData, &tKey, 0, &pIter->iter);
+    TSDBROW *pRow = tsdbTbDataIterGet(&pIter->iter);
+
+    if (pRow && TSDBROW_TS(pRow) > pCommitter->maxKey) {
+      pCommitter->nextKey = TMIN(pCommitter->nextKey, TSDBROW_TS(pRow));
+      continue;
+    }
+
+    pIter->r.suid = pTbData->suid;
+    pIter->r.uid = pTbData->uid;
+    pIter->r.row = *pRow;
+    break;
+  }
+
+  tRBTreePut(&pCommitter->rbt, (SRBTreeNode *)pIter);
+
+  // disk
+  if (0) {
+  }
+
+  code = tsdbNextCommitRow(pCommitter);
+  if (code) goto _err;
+
+  return code;
+
+_err:
+  return code;
+}
+
 static int32_t tsdbCommitFileDataStart(SCommitter *pCommitter) {
   int32_t    code = 0;
   STsdb     *pTsdb = pCommitter->pTsdb;
@@ -464,6 +527,10 @@ static int32_t tsdbCommitFileDataStart(SCommitter *pCommitter) {
   tBlockDataReset(&pCommitter->dWriter.bData);
   tBlockDataReset(&pCommitter->dWriter.bDatal);
 
+  // open iter
+  code = tsdbOpenCommitIter(pCommitter);
+  if (code) goto _err;
+
 _exit:
   return code;
 
@@ -1325,24 +1392,6 @@ _err:
 }
 
 // ================================================================================
-static int32_t tRowInfoCmprFn(const void *p1, const void *p2) {
-  SRowInfo *pInfo1 = (SRowInfo *)p1;
-  SRowInfo *pInfo2 = (SRowInfo *)p2;
-
-  if (pInfo1->suid < pInfo2->suid) {
-    return -1;
-  } else if (pInfo1->suid > pInfo2->suid) {
-    return 1;
-  }
-
-  if (pInfo1->uid < pInfo2->uid) {
-    return -1;
-  } else if (pInfo1->uid > pInfo2->uid) {
-    return 1;
-  }
-
-  return tsdbRowCmprFn(&pInfo1->row, &pInfo2->row);
-}
 
 static FORCE_INLINE SRowInfo *tsdbGetCommitRow(SCommitter *pCommitter) {
   return (pCommitter->pIter) ? &pCommitter->pIter->r : NULL;
@@ -1370,8 +1419,8 @@ static int32_t tsdbNextCommitRow(SCommitter *pCommitter) {
         }
 
         pIter->iTbDataP++;
-        if (pIter->iTbDataP < taosArrayGetSize(pIter->aTbDataP)) {
-          STbData *pTbData = (STbData *)taosArrayGetP(pIter->aTbDataP, pIter->iTbDataP);
+        if (pIter->iTbDataP < taosArrayGetSize(pCommitter->aTbDataP)) {
+          STbData *pTbData = (STbData *)taosArrayGetP(pCommitter->aTbDataP, pIter->iTbDataP);
           TSDBKEY  keyFrom = {.ts = pCommitter->minKey, .version = VERSION_MIN};
           tsdbTbDataIterOpen(pTbData, &keyFrom, 0, &pIter->iter);
           pRow = tsdbTbDataIterGet(&pIter->iter);