diff --git a/source/dnode/vnode/src/inc/tsdb.h b/source/dnode/vnode/src/inc/tsdb.h
index ef37b41f30..d3d3eeb107 100644
--- a/source/dnode/vnode/src/inc/tsdb.h
+++ b/source/dnode/vnode/src/inc/tsdb.h
@@ -250,6 +250,7 @@ void   *tsdbTbDataIterDestroy(STbDataIter *pIter);
 void    tsdbTbDataIterOpen(STbData *pTbData, STsdbRowKey *pFrom, int8_t backward, STbDataIter *pIter);
 bool    tsdbTbDataIterNext(STbDataIter *pIter);
 void    tsdbMemTableCountRows(SMemTable *pMemTable, SSHashObj *pTableMap, int64_t *rowsNum);
+int32_t tsdbMemTableUids(SMemTable *pMemTable, SArray *aUid);
 
 // STbData
 int32_t tsdbGetNRowsInTbData(STbData *pTbData);
diff --git a/source/dnode/vnode/src/tsdb/tsdbCache.c b/source/dnode/vnode/src/tsdb/tsdbCache.c
index eb0e7b684e..2564e89d1a 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCache.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCache.c
@@ -493,10 +493,126 @@ int tsdbCacheFlushDirty(const void *key, size_t klen, void *value, void *ud) {
   return 0;
 }
 
+static int32_t tsdbCacheQueryReseek(void *pQHandle) {
+  int32_t           code = 0;
+  SCacheRowsReader *pReader = pQHandle;
+
+  code = taosThreadMutexTryLock(&pReader->readerMutex);
+  if (code == 0) {
+    // pause current reader's state if not paused, save ts & version for resuming
+    // just wait for the big all tables' snapshot untaking for now
+
+    code = TSDB_CODE_VND_QUERY_BUSY;
+    (void)taosThreadMutexUnlock(&pReader->readerMutex);
+
+    return code;
+  } else if (code == EBUSY) {
+    return TSDB_CODE_VND_QUERY_BUSY;
+  } else {
+    return -1;
+  }
+}
+
+static int32_t tsdbLoadFromImem(SMemTable *imem, TABLEID tid, SArray *ctxArray) {
+  int32_t code = 0;
+  int32_t lino = 0;
+  STsdb  *pTsdb = imem->pTsdb;
+
+  STbData *pIMem = tsdbGetTbDataFromMemTable(imem, tid.suid, tid.uid);
+
+  STbDataIter iter = {0};
+  tsdbTbDataIterOpen(pIMem, NULL, 1, &iter);
+  TSDBROW *pMemRow = tsdbTbDataIterGet(&iter);
+  if (pMemRow) {
+    //*ppRow = pMemRow;
+    // if non deleted, foundLastrow = true;
+
+  } else {
+    TAOS_RETURN(code);
+  }
+
+_exit:
+  if (code) {
+    tsdbError("vgId:%d %s failed at %s:%d since %s", TD_VID(pTsdb->pVnode), __func__, __FILE__, lino, tstrerror(code));
+  } else {
+    tsdbInfo("vgId:%d %s done", TD_VID(pTsdb->pVnode), __func__);
+  }
+
+  TAOS_RETURN(code);
+}
+
+static int32_t tsdbCacheUpdate(STsdb *pTsdb, tb_uid_t suid, tb_uid_t uid, SArray *updCtxArray);
+
+static int32_t tsdbCacheUpdateFromIMem(STsdb *pTsdb) {
+  if (!pTsdb) return 0;
+  if (!pTsdb->imem) return 0;
+
+  int32_t    code = 0;
+  int32_t    lino = 0;
+  SMemTable *imem = pTsdb->imem;
+  int32_t    nTbData = imem->nTbData;
+  int64_t    nRow = imem->nRow;
+  int64_t    nDel = imem->nDel;
+  SArray    *aUid = NULL;
+  SArray    *ctxArray = NULL;
+
+  if (nRow == 0 || nTbData == 0) return 0;
+
+  // get all last/last_row cols of all uids from imem
+  // 1, get all uids from imem
+  aUid = taosArrayInit(nTbData, sizeof(TABLEID));
+  TAOS_CHECK_GOTO(tsdbMemTableUids(imem, aUid), &lino, _exit);
+
+  // 2, read all uid's last/last with tomb filtered
+  if (!pTsdb->rCache.ctxArray) {
+    pTsdb->rCache.ctxArray = taosArrayInit(16, sizeof(SLastUpdateCtx));
+    if (!pTsdb->rCache.ctxArray) {
+      TAOS_CHECK_GOTO(TSDB_CODE_OUT_OF_MEMORY, &lino, _exit);
+    }
+  }
+  ctxArray = pTsdb->rCache.ctxArray;
+
+  for (int32_t i = 0; i < TARRAY_SIZE(aUid); ++i) {
+    TABLEID tid = ((TABLEID *)TARRAY_DATA(aUid))[i];
+
+    TAOS_CHECK_GOTO(tsdbLoadFromImem(imem, tid, ctxArray), &lino, _exit);
+  }
+
+  // 3, update cols into lru
+  for (int32_t i = 0; i < TARRAY_SIZE(aUid); ++i) {
+    TABLEID tid = ((TABLEID *)TARRAY_DATA(aUid))[i];
+
+    TAOS_CHECK_GOTO(tsdbCacheUpdate(pTsdb, tid.suid, tid.uid, ctxArray), &lino, _exit);
+  }
+
+_exit:
+  if (code) {
+    tsdbError("vgId:%d %s failed at %s:%d since %s", TD_VID(pTsdb->pVnode), __func__, __FILE__, lino, tstrerror(code));
+  } else {
+    tsdbInfo("vgId:%d %s done, nRow:%" PRId64 " nDel:%" PRId64, TD_VID(pTsdb->pVnode), __func__, nRow, nDel);
+  }
+
+  taosArrayDestroy(aUid);
+  taosArrayClear(ctxArray);
+
+  TAOS_RETURN(code);
+}
+
 int32_t tsdbCacheCommit(STsdb *pTsdb) {
   int32_t code = 0;
-  char   *err = NULL;
 
+  // 0, tsdbCacheUpdateFromIMem if updateCacheBatch
+  // flush dirty data of lru into rocks with
+  // 4, and update when writing if !updateCacheBatch
+
+  code = tsdbCacheUpdateFromIMem(pTsdb);
+  if (code) {
+    tsdbError("vgId:%d, %s failed at line %d since %s", TD_VID(pTsdb->pVnode), __func__, __LINE__, tstrerror(code));
+
+    TAOS_RETURN(code);
+  }
+
+  char                 *err = NULL;
   SLRUCache            *pCache = pTsdb->lruCache;
   rocksdb_writebatch_t *wb = pTsdb->rCache.writebatch;
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbMemTable.c b/source/dnode/vnode/src/tsdb/tsdbMemTable.c
index eb22335311..617bfc1e17 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMemTable.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMemTable.c
@@ -321,6 +321,25 @@ void tsdbMemTableCountRows(SMemTable *pMemTable, SSHashObj *pTableMap, int64_t *
   taosRUnLockLatch(&pMemTable->latch);
 }
 
+int32_t tsdbMemTableUids(SMemTable *pMemTable, SArray *aUid) {
+  int32_t code = 0;
+
+  taosRLockLatch(&pMemTable->latch);
+  for (int32_t i = 0; i < pMemTable->nBucket; ++i) {
+    STbData *pTbData = pMemTable->aBucket[i];
+    while (pTbData) {
+      if (!taosArrayPush(aUid, &(TABLEID){.suid = pTbData->suid, .uid = pTbData->uid})) {
+        TAOS_RETURN(terrno);
+      }
+
+      pTbData = pTbData->next;
+    }
+  }
+  taosRUnLockLatch(&pMemTable->latch);
+
+  return code;
+}
+
 static int32_t tsdbMemTableRehash(SMemTable *pMemTable) {
   int32_t code = 0;