diff --git a/src/tsdb/inc/tsdbMain.h b/src/tsdb/inc/tsdbMain.h
index 6119f7086c6575a629dbb822425a775f394f9a3a..f42c00f1711a276c2a4d6682f93d0b92864aabb9 100644
--- a/src/tsdb/inc/tsdbMain.h
+++ b/src/tsdb/inc/tsdbMain.h
@@ -151,22 +151,22 @@ typedef struct {
 // ------------------ tsdbFile.c
 extern const char* tsdbFileSuffix[];
 typedef enum {
-#ifdef TSDB_IDX
-  TSDB_FILE_TYPE_IDX = 0,
-  TSDB_FILE_TYPE_HEAD,
-#else
   TSDB_FILE_TYPE_HEAD = 0,
-#endif
   TSDB_FILE_TYPE_DATA,
   TSDB_FILE_TYPE_LAST,
-  TSDB_FILE_TYPE_MAX,
-#ifdef TSDB_IDX
-  TSDB_FILE_TYPE_NIDX,
-#endif
+  TSDB_FILE_TYPE_STAT,
   TSDB_FILE_TYPE_NHEAD,
-  TSDB_FILE_TYPE_NLAST
+  TSDB_FILE_TYPE_NDATA,
+  TSDB_FILE_TYPE_NLAST,
+  TSDB_FILE_TYPE_NSTAT
 } TSDB_FILE_TYPE;
 
+#ifndef TDINTERNAL
+#define TSDB_FILE_TYPE_MAX (TSDB_FILE_TYPE_LAST+1)
+#else
+#define TSDB_FILE_TYPE_MAX (TSDB_FILE_TYPE_STAT+1)
+#endif
+
 typedef struct {
   uint32_t magic;
   uint32_t len;
@@ -281,9 +281,6 @@ typedef struct {
   TSKEY      minKey;
   TSKEY      maxKey;
   SFileGroup fGroup;
-#ifdef TSDB_IDX
-  SFile nIdxF;
-#endif
   SFile      nHeadF;
   SFile      nLastF;
 } SHelperFile;
@@ -497,10 +494,6 @@ void        tsdbGetFidKeyRange(int daysPerFile, int8_t precision, int fileId, TS
 #define helperState(h) (h)->state
 #define TSDB_NLAST_FILE_OPENED(h) ((h)->files.nLastF.fd > 0)
 #define helperFileId(h) ((h)->files.fGroup.fileId)
-#ifdef TSDB_IDX
-#define helperIdxF(h) (&((h)->files.fGroup.files[TSDB_FILE_TYPE_IDX]))
-#define helperNewIdxF(h) (&((h)->files.nIdxF))
-#endif
 #define helperHeadF(h) (&((h)->files.fGroup.files[TSDB_FILE_TYPE_HEAD]))
 #define helperDataF(h) (&((h)->files.fGroup.files[TSDB_FILE_TYPE_DATA]))
 #define helperLastF(h) (&((h)->files.fGroup.files[TSDB_FILE_TYPE_LAST]))
@@ -512,7 +505,7 @@ int  tsdbInitWriteHelper(SRWHelper* pHelper, STsdbRepo* pRepo);
 void tsdbDestroyHelper(SRWHelper* pHelper);
 void tsdbResetHelper(SRWHelper* pHelper);
 int  tsdbSetAndOpenHelperFile(SRWHelper* pHelper, SFileGroup* pGroup);
-int  tsdbCloseHelperFile(SRWHelper* pHelper, bool hasError);
+int  tsdbCloseHelperFile(SRWHelper* pHelper, bool hasError, SFileGroup* pGroup);
 int  tsdbSetHelperTable(SRWHelper* pHelper, STable* pTable, STsdbRepo* pRepo);
 int  tsdbCommitTableData(SRWHelper* pHelper, SCommitIter* pCommitIter, SDataCols* pDataCols, TSKEY maxKey);
 int  tsdbMoveLastBlockIfNeccessary(SRWHelper* pHelper);
diff --git a/src/tsdb/src/tsdbFile.c b/src/tsdb/src/tsdbFile.c
index ee3bad9835bd5cb0be83d3a56102ac67771c5d4b..b8173d41b398747c4742a7c6e3cdd06b71030f67 100644
--- a/src/tsdb/src/tsdbFile.c
+++ b/src/tsdb/src/tsdbFile.c
@@ -21,11 +21,7 @@
 
 #define TAOS_RANDOM_FILE_FAIL_TEST
 
-#ifdef TSDB_IDX
-const char *tsdbFileSuffix[] = {".idx", ".head", ".data", ".last", "", ".i", ".h", ".l"};
-#else
-const char *tsdbFileSuffix[] = {".head", ".data", ".last", "", ".h", ".l"};
-#endif
+const char *tsdbFileSuffix[] = {".head", ".data", ".last", ".stat", ".h", ".d", ".l", ".s"};
 
 static int   tsdbInitFile(SFile *pFile, STsdbRepo *pRepo, int fid, int type);
 static void  tsdbDestroyFile(SFile *pFile);
@@ -413,6 +409,10 @@ static int tsdbInitFile(SFile *pFile, STsdbRepo *pRepo, int fid, int type) {
   pBuf = taosDecodeFixedU32(pBuf, &version);
   pBuf = tsdbDecodeSFileInfo(pBuf, &(pFile->info));
 
+  if (pFile->info.size == TSDB_FILE_HEAD_SIZE) {
+    pFile->info.size = lseek(pFile->fd, 0, SEEK_END);
+  }
+
   if (version != TSDB_FILE_VERSION) {
     tsdbError("vgId:%d file %s version %u is not the same as program version %u which may cause problem",
               REPO_ID(pRepo), pFile->fname, version, TSDB_FILE_VERSION);
diff --git a/src/tsdb/src/tsdbMemTable.c b/src/tsdb/src/tsdbMemTable.c
index 02c3ee4d85663ebbe5cc2300d993b98938d676ef..cd5f223f3da5c7595e3c267590b0be3047181daf 100644
--- a/src/tsdb/src/tsdbMemTable.c
+++ b/src/tsdb/src/tsdbMemTable.c
@@ -679,15 +679,10 @@ static int tsdbCommitToFile(STsdbRepo *pRepo, int fid, SCommitIter *iters, SRWHe
   }
 
   taosTFree(dataDir);
-  tsdbCloseHelperFile(pHelper, 0);
+  tsdbCloseHelperFile(pHelper, 0, pGroup);
 
   pthread_rwlock_wrlock(&(pFileH->fhlock));
 
-#ifdef TSDB_IDX
-  rename(helperNewIdxF(pHelper)->fname, helperIdxF(pHelper)->fname);
-  pGroup->files[TSDB_FILE_TYPE_IDX].info = helperNewIdxF(pHelper)->info;
-#endif
-
   rename(helperNewHeadF(pHelper)->fname, helperHeadF(pHelper)->fname);
   pGroup->files[TSDB_FILE_TYPE_HEAD].info = helperNewHeadF(pHelper)->info;
 
@@ -706,7 +701,7 @@ static int tsdbCommitToFile(STsdbRepo *pRepo, int fid, SCommitIter *iters, SRWHe
 
 _err:
   taosTFree(dataDir);
-  tsdbCloseHelperFile(pHelper, 1);
+  tsdbCloseHelperFile(pHelper, 1, NULL);
   return -1;
 }
 
diff --git a/src/tsdb/src/tsdbRWHelper.c b/src/tsdb/src/tsdbRWHelper.c
index d63bf8ab787646953f247aa8e021cb61659f1ad5..1e082e39bed065d6ae81a8aef53342a2f0535938 100644
--- a/src/tsdb/src/tsdbRWHelper.c
+++ b/src/tsdb/src/tsdbRWHelper.c
@@ -91,7 +91,7 @@ void tsdbResetHelper(SRWHelper *pHelper) {
     tsdbResetHelperTableImpl(pHelper);
 
     // Reset the file part
-    tsdbCloseHelperFile(pHelper, false);
+    tsdbCloseHelperFile(pHelper, false, NULL);
     tsdbResetHelperFileImpl(pHelper);
 
     pHelper->state = TSDB_HELPER_CLEAR_STATE;
@@ -110,31 +110,16 @@ int tsdbSetAndOpenHelperFile(SRWHelper *pHelper, SFileGroup *pGroup) {
   // Set the files
   pHelper->files.fGroup = *pGroup;
   if (helperType(pHelper) == TSDB_WRITE_HELPER) {
-#ifdef TSDB_IDX
-    tsdbGetDataFileName(pHelper->pRepo, pGroup->fileId, TSDB_FILE_TYPE_NIDX, helperNewIdxF(pHelper)->fname);
-#endif
     tsdbGetDataFileName(pHelper->pRepo, pGroup->fileId, TSDB_FILE_TYPE_NHEAD, helperNewHeadF(pHelper)->fname);
     tsdbGetDataFileName(pHelper->pRepo, pGroup->fileId, TSDB_FILE_TYPE_NLAST, helperNewLastF(pHelper)->fname);
   }
 
   // Open the files
-#ifdef TSDB_IDX
-  if (tsdbOpenFile(helperIdxF(pHelper), O_RDONLY) < 0) return -1;
-#endif
   if (tsdbOpenFile(helperHeadF(pHelper), O_RDONLY) < 0) return -1;
   if (helperType(pHelper) == TSDB_WRITE_HELPER) {
     if (tsdbOpenFile(helperDataF(pHelper), O_RDWR) < 0) return -1;
     if (tsdbOpenFile(helperLastF(pHelper), O_RDWR) < 0) return -1;
 
-#ifdef TSDB_IDX
-    // Create and open .i file
-    pFile = helperNewIdxF(pHelper);
-    if (tsdbOpenFile(pFile, O_WRONLY | O_CREAT) < 0) return -1;
-    pFile->info.size = TSDB_FILE_HEAD_SIZE;
-    pFile->info.magic = TSDB_FILE_INIT_MAGIC;
-    if (tsdbUpdateFileHeader(pFile) < 0) return -1;
-#endif
-
     // Create and open .h
     pFile = helperNewHeadF(pHelper);
     if (tsdbOpenFile(pFile, O_WRONLY | O_CREAT) < 0) return -1;
@@ -161,14 +146,9 @@ int tsdbSetAndOpenHelperFile(SRWHelper *pHelper, SFileGroup *pGroup) {
   return 0;
 }
 
-int tsdbCloseHelperFile(SRWHelper *pHelper, bool hasError) {
+int tsdbCloseHelperFile(SRWHelper *pHelper, bool hasError, SFileGroup *pGroup) {
   SFile *pFile = NULL;
 
-#ifdef TSDB_IDX
-  pFile = helperIdxF(pHelper);
-  tsdbCloseFile(pFile);
-#endif
-
   pFile = helperHeadF(pHelper);
   tsdbCloseFile(pFile);
 
@@ -177,10 +157,11 @@ int tsdbCloseHelperFile(SRWHelper *pHelper, bool hasError) {
     if (helperType(pHelper) == TSDB_WRITE_HELPER) {
       if (!hasError) {
         tsdbUpdateFileHeader(pFile);
-        fsync(pFile->fd);
       } else {
-        // TODO: shrink back to origin
+        ASSERT(pGroup != NULL);
+        taosFtruncate(pFile->fd, pGroup->files[TSDB_FILE_TYPE_DATA].info.size);
       }
+      fsync(pFile->fd);
     }
     tsdbCloseFile(pFile);
   }
@@ -190,27 +171,16 @@ int tsdbCloseHelperFile(SRWHelper *pHelper, bool hasError) {
     if (helperType(pHelper) == TSDB_WRITE_HELPER && !TSDB_NLAST_FILE_OPENED(pHelper)) {
       if (!hasError) {
         tsdbUpdateFileHeader(pFile);
-        fsync(pFile->fd);
       } else {
-        // TODO: shrink back to origin
+        ASSERT(pGroup != NULL);
+        taosFtruncate(pFile->fd, pGroup->files[TSDB_FILE_TYPE_LAST].info.size);
       }
+      fsync(pFile->fd);
     }
     tsdbCloseFile(pFile);
   }
 
   if (helperType(pHelper) == TSDB_WRITE_HELPER) {
-#ifdef TSDB_IDX
-    pFile = helperNewIdxF(pHelper);
-    if (pFile->fd > 0) {
-      if (!hasError) {
-        tsdbUpdateFileHeader(pFile);
-        fsync(pFile->fd);
-      }
-      tsdbCloseFile(pFile);
-      if (hasError) (void)remove(pFile->fname);
-    }
-#endif
-
     pFile = helperNewHeadF(pHelper);
     if (pFile->fd > 0) {
       if (!hasError) {
@@ -412,10 +382,6 @@ int tsdbWriteCompInfo(SRWHelper *pHelper) {
       return -1;
     }
 
-#ifdef TSDB_IDX
-    pFile = helperNewIdxF(pHelper);
-#endif
-
     if (taosTSizeof(pHelper->pWIdx) < pFile->info.len + sizeof(SCompIdx) + 12) {
       pHelper->pWIdx = taosTRealloc(pHelper->pWIdx, taosTSizeof(pHelper->pWIdx) == 0 ? 1024 : taosTSizeof(pHelper->pWIdx) * 2);
       if (pHelper->pWIdx == NULL) {
@@ -426,6 +392,9 @@ int tsdbWriteCompInfo(SRWHelper *pHelper) {
 
     void *pBuf = POINTER_SHIFT(pHelper->pWIdx, pFile->info.len);
     pFile->info.len += tsdbEncodeSCompIdx(&pBuf, &(pHelper->curCompIdx));
+
+    pFile->info.size += pIdx->len;
+    // ASSERT(pFile->info.size == lseek(pFile->fd, 0, SEEK_CUR));
   }
 
   return 0;
@@ -435,11 +404,7 @@ int tsdbWriteCompIdx(SRWHelper *pHelper) {
   ASSERT(helperType(pHelper) == TSDB_WRITE_HELPER);
   off_t offset = 0;
 
-#ifdef TSDB_IDX
-  SFile *pFile = helperNewIdxF(pHelper);
-#else
   SFile *pFile = helperNewHeadF(pHelper);
-#endif
 
   pFile->info.len += sizeof(TSCKSUM);
   if (taosTSizeof(pHelper->pWIdx) < pFile->info.len) {
@@ -460,7 +425,7 @@ int tsdbWriteCompIdx(SRWHelper *pHelper) {
     return -1;
   }
 
-  pFile->info.offset = offset;
+  ASSERT(offset == pFile->info.size);
 
   if (taosTWrite(pFile->fd, (void *)pHelper->pWIdx, pFile->info.len) < (int)pFile->info.len) {
     tsdbError("vgId:%d failed to write %d bytes to file %s since %s", REPO_ID(pHelper->pRepo), pFile->info.len,
@@ -469,16 +434,16 @@ int tsdbWriteCompIdx(SRWHelper *pHelper) {
     return -1;
   }
 
+  pFile->info.offset = offset;
+  pFile->info.size += pFile->info.len;
+  // ASSERT(pFile->info.size == lseek(pFile->fd, 0, SEEK_CUR));
+
   return 0;
 }
 
 int tsdbLoadCompIdx(SRWHelper *pHelper, void *target) {
   ASSERT(pHelper->state == TSDB_HELPER_FILE_SET_AND_OPEN);
-#ifdef TSDB_IDX
-  SFile *pFile = helperIdxF(pHelper);
-#else
   SFile *pFile = helperHeadF(pHelper);
-#endif
   int fd = pFile->fd;
 
   if (!helperHasState(pHelper, TSDB_HELPER_IDX_LOAD)) {
@@ -847,6 +812,9 @@ static int tsdbWriteBlockToFile(SRWHelper *pHelper, SFile *pFile, SDataCols *pDa
             (int)(pCompBlock->numOfRows), pCompBlock->len, pCompBlock->numOfCols, pCompBlock->keyFirst,
             pCompBlock->keyLast);
 
+  pFile->info.size += pCompBlock->len;
+  // ASSERT(pFile->info.size == lseek(pFile->fd, 0, SEEK_CUR));
+
   return 0;
 
 _err:
@@ -1052,10 +1020,6 @@ static void tsdbResetHelperFileImpl(SRWHelper *pHelper) {
   helperLastF(pHelper)->fd = -1;
   helperNewHeadF(pHelper)->fd = -1;
   helperNewLastF(pHelper)->fd = -1;
-#ifdef TSDB_IDX
-  helperIdxF(pHelper)->fd = -1;
-  helperNewIdxF(pHelper)->fd = -1;
-#endif
 }
 
 static int tsdbInitHelperFile(SRWHelper *pHelper) {
@@ -1064,7 +1028,7 @@ static int tsdbInitHelperFile(SRWHelper *pHelper) {
 }
 
 static void tsdbDestroyHelperFile(SRWHelper *pHelper) {
-  tsdbCloseHelperFile(pHelper, false);
+  tsdbCloseHelperFile(pHelper, false, NULL);
   tsdbResetHelperFileImpl(pHelper);
   taosTZfree(pHelper->idxH.pIdxArray);
   taosTZfree(pHelper->pWIdx);