diff --git a/src/inc/taoserror.h b/src/inc/taoserror.h
index c9071f4cb0c14e689583b25c1c7e2939ec4a6fb6..98355a8672b94e4fc6b6051e31cba6bb985a0565 100644
--- a/src/inc/taoserror.h
+++ b/src/inc/taoserror.h
@@ -115,6 +115,7 @@ TAOS_DEFINE_ERROR(TSDB_CODE_INVALID_QUERY_ID,           0, 255, "invalid query i
 TAOS_DEFINE_ERROR(TSDB_CODE_INVALID_STREAM_ID,          0, 256, "invalid stream id")
 TAOS_DEFINE_ERROR(TSDB_CODE_INVALID_CONNECTION,         0, 257, "invalid connection")
 TAOS_DEFINE_ERROR(TSDB_CODE_SDB_ERROR,                  0, 258, "sdb error")
+TAOS_DEFINE_ERROR(TSDB_CODE_TIMESTAMP_OUT_OF_RANGE,     0, 259, "timestamp is out of range")
 
 // acct
 TAOS_DEFINE_ERROR(TSDB_CODE_ACCT_ALREADY_EXIST,         0, 300, "accounts already exist")
diff --git a/src/tsdb/inc/tsdbMain.h b/src/tsdb/inc/tsdbMain.h
index 22d069141654b129f366c6b5dfc5c1a32373dc46..89708a5553c6fc6e4472a9bc00f0f7b804ff862f 100644
--- a/src/tsdb/inc/tsdbMain.h
+++ b/src/tsdb/inc/tsdbMain.h
@@ -227,13 +227,13 @@ typedef struct {
   int maxFGroups;
   int numOfFGroups;
 
-  SFileGroup fGroup[];
+  SFileGroup *fGroup;
 } STsdbFileH;
 
 #define TSDB_MIN_FILE_ID(fh) (fh)->fGroup[0].fileId
 #define TSDB_MAX_FILE_ID(fh) (fh)->fGroup[(fh)->numOfFGroups - 1].fileId
 
-STsdbFileH *tsdbInitFileH(char *dataDir, int maxFiles);
+STsdbFileH *tsdbInitFileH(char *dataDir, STsdbCfg *pCfg);
 void        tsdbCloseFileH(STsdbFileH *pFileH);
 int         tsdbCreateFile(char *dataDir, int fileId, const char *suffix, int maxTables, SFile *pFile, int writeHeader,
                            int toClose);
@@ -486,6 +486,9 @@ int tsdbMoveLastBlockIfNeccessary(SRWHelper *pHelper);
 int tsdbWriteCompInfo(SRWHelper *pHelper);
 int tsdbWriteCompIdx(SRWHelper *pHelper);
 
+// --------- Other functions need to further organize
+void tsdbFitRetention(STsdbRepo *pRepo);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/tsdb/src/tsdbFile.c b/src/tsdb/src/tsdbFile.c
index ab76f69bedf1d289be57f7b2539ff1b9fbcac466..51bdda79e65d5fd43dc95eef69648d58d935c1cc 100644
--- a/src/tsdb/src/tsdbFile.c
+++ b/src/tsdb/src/tsdbFile.c
@@ -27,6 +27,7 @@
 #include "tchecksum.h"
 #include "tsdbMain.h"
 #include "tutil.h"
+#include "ttime.h"
 
 const char *tsdbFileSuffix[] = {
     ".head",  // TSDB_FILE_TYPE_HEAD
@@ -40,13 +41,19 @@ static int tsdbWriteFileHead(SFile *pFile);
 static int tsdbWriteHeadFileIdx(SFile *pFile, int maxTables);
 static int tsdbOpenFGroup(STsdbFileH *pFileH, char *dataDir, int fid);
 
-STsdbFileH *tsdbInitFileH(char *dataDir, int maxFiles) {
-  STsdbFileH *pFileH = (STsdbFileH *)calloc(1, sizeof(STsdbFileH) + sizeof(SFileGroup) * maxFiles);
+STsdbFileH *tsdbInitFileH(char *dataDir, STsdbCfg *pCfg) {
+  STsdbFileH *pFileH = (STsdbFileH *)calloc(1, sizeof(STsdbFileH));
   if (pFileH == NULL) {  // TODO: deal with ERROR here
     return NULL;
   }
 
-  pFileH->maxFGroups = maxFiles;
+  pFileH->maxFGroups = pCfg->keep / pCfg->daysPerFile + 2;
+
+  pFileH->fGroup = (SFileGroup *)calloc(pFileH->maxFGroups, sizeof(SFileGroup));
+  if (pFileH->fGroup == NULL) {
+    free(pFileH);
+    return NULL;
+  }
 
   DIR *dir = opendir(dataDir);
   if (dir == NULL) {
@@ -69,7 +76,12 @@ STsdbFileH *tsdbInitFileH(char *dataDir, int maxFiles) {
   return pFileH;
 }
 
-void tsdbCloseFileH(STsdbFileH *pFileH) { free(pFileH); }
+void tsdbCloseFileH(STsdbFileH *pFileH) {
+  if (pFileH) {
+    tfree(pFileH->fGroup);
+    free(pFileH);
+  }
+}
 
 static int tsdbInitFile(char *dataDir, int fid, const char *suffix, SFile *pFile) {
   tsdbGetFileName(dataDir, fid, suffix, pFile->fname);
@@ -161,6 +173,18 @@ void tsdbInitFileGroupIter(STsdbFileH *pFileH, SFileGroupIter *pIter, int direct
   }
 }
 
+void tsdbFitRetention(STsdbRepo *pRepo) {
+  STsdbFileH *pFileH = pRepo->tsdbFileH;
+  SFileGroup *pGroup = pFileH->fGroup;
+
+  int mfid =
+      tsdbGetKeyFileId(taosGetTimestamp(pRepo->config.precision), pRepo->config.daysPerFile, pRepo->config.precision);
+
+  while (pGroup[0].fileId < mfid) {
+    tsdbRemoveFileGroup(pFileH, pGroup[0].fileId);
+  }
+}
+
 void tsdbSeekFileGroupIter(SFileGroupIter *pIter, int fid) {
   if (pIter->numOfFGroups == 0) {
     assert(pIter->pFileGroup == NULL);
@@ -252,43 +276,6 @@ int tsdbCopyBlockDataInFile(SFile *pOutFile, SFile *pInFile, SCompInfo *pCompInf
   return 0;
 }
 
-// int tsdbLoadCompIdx(SFileGroup *pGroup, void *buf, int maxTables) {
-//   SFile *pFile = &(pGroup->files[TSDB_FILE_TYPE_HEAD]);
-//   if (lseek(pFile->fd, TSDB_FILE_HEAD_SIZE, SEEK_SET) < 0) return -1;
-
-//   if (read(pFile->fd, buf, sizeof(SCompIdx) * maxTables) < 0) return -1;
-//   // TODO: need to check the correctness
-//   return 0;
-// }
-
-// int tsdbLoadCompBlocks(SFileGroup *pGroup, SCompIdx *pIdx, void *buf) {
-//   SFile *pFile = &(pGroup->files[TSDB_FILE_TYPE_HEAD]);
-
-//   if (lseek(pFile->fd, pIdx->offset, SEEK_SET) < 0) return -1;
-
-//   if (read(pFile->fd, buf, pIdx->len) < 0) return -1;
-
-//   // TODO: need to check the correctness
-
-//   return 0;
-// }
-
-// int tsdbLoadCompCols(SFile *pFile, SCompBlock *pBlock, void *buf) {
-//   // assert(pBlock->numOfSubBlocks == 0 || pBlock->numOfSubBlocks == 1);
-
-//   if (lseek(pFile->fd, pBlock->offset, SEEK_SET) < 0) return -1;
-//   size_t size = sizeof(SCompData) + sizeof(SCompCol) * pBlock->numOfCols;
-//   if (read(pFile->fd, buf, size) < 0) return -1;
-
-//   return 0;
-// }
-
-// int tsdbLoadColData(SFile *pFile, SCompCol *pCol, int64_t blockBaseOffset, void *buf) {
-//   if (lseek(pFile->fd, blockBaseOffset + pCol->offset, SEEK_SET) < 0) return -1;
-//   if (read(pFile->fd, buf, pCol->len) < 0) return -1;
-//   return 0;
-// }
-
 static int compFGroupKey(const void *key, const void *fgroup) {
   int         fid = *(int *)key;
   SFileGroup *pFGroup = (SFileGroup *)fgroup;
diff --git a/src/tsdb/src/tsdbMain.c b/src/tsdb/src/tsdbMain.c
index b1ef3d2d9ce38e0c0e0347ac9d1c6b9a61905cb3..dd5dbd3f8d4f0040ba51f1f6b31f37bcb62c95b8 100644
--- a/src/tsdb/src/tsdbMain.c
+++ b/src/tsdb/src/tsdbMain.c
@@ -6,6 +6,7 @@
 #include "tsdbMain.h"
 #include "tscompression.h"
 #include "tchecksum.h"
+#include "ttime.h"
 
 int tsdbDebugFlag = 135;
 
@@ -27,7 +28,7 @@ static int32_t tsdbCheckAndSetDefaultCfg(STsdbCfg *pCfg);
 static int32_t tsdbSetRepoEnv(STsdbRepo *pRepo);
 static int32_t tsdbDestroyRepoEnv(STsdbRepo *pRepo);
 // static int     tsdbOpenMetaFile(char *tsdbDir);
-static int32_t tsdbInsertDataToTable(TsdbRepoT *repo, SSubmitBlk *pBlock);
+static int32_t tsdbInsertDataToTable(TsdbRepoT *repo, SSubmitBlk *pBlock, TSKEY now);
 static int32_t tsdbRestoreCfg(STsdbRepo *pRepo, STsdbCfg *pCfg);
 static int32_t tsdbGetDataDirName(STsdbRepo *pRepo, char *fname);
 static void *  tsdbCommitData(void *arg);
@@ -214,7 +215,7 @@ TsdbRepoT *tsdbOpenRepo(char *tsdbDir, STsdbAppH *pAppH) {
   }
 
   tsdbGetDataDirName(pRepo, dataDir);
-  pRepo->tsdbFileH = tsdbInitFileH(dataDir, pRepo->config.maxTables);
+  pRepo->tsdbFileH = tsdbInitFileH(dataDir, &(pRepo->config));
   if (pRepo->tsdbFileH == NULL) {
     tsdbFreeCache(pRepo->tsdbCache);
     tsdbFreeMeta(pRepo->tsdbMeta);
@@ -394,13 +395,16 @@ STableInfo *tsdbGetTableInfo(TsdbRepoT *pRepo, STableId tableId) {
 // TODO: need to return the number of data inserted
 int32_t tsdbInsertData(TsdbRepoT *repo, SSubmitMsg *pMsg) {
   SSubmitMsgIter msgIter;
+  STsdbRepo *pRepo = (STsdbRepo *)repo;
 
   tsdbInitSubmitMsgIter(pMsg, &msgIter);
   SSubmitBlk *pBlock = NULL;
   int32_t code = TSDB_CODE_SUCCESS;
-  
+
+  TSKEY now = taosGetTimestamp(pRepo->config.precision);
+
   while ((pBlock = tsdbGetSubmitMsgNext(&msgIter)) != NULL) {
-    if ((code = tsdbInsertDataToTable(repo, pBlock)) != TSDB_CODE_SUCCESS) {
+    if ((code = tsdbInsertDataToTable(repo, pBlock, now)) != TSDB_CODE_SUCCESS) {
       return code;
     }
   }
@@ -787,21 +791,31 @@ static int32_t tdInsertRowToTable(STsdbRepo *pRepo, SDataRow row, STable *pTable
   return 0;
 }
 
-static int32_t tsdbInsertDataToTable(TsdbRepoT *repo, SSubmitBlk *pBlock) {
+static int32_t tsdbInsertDataToTable(TsdbRepoT *repo, SSubmitBlk *pBlock, TSKEY now) {
   STsdbRepo *pRepo = (STsdbRepo *)repo;
 
   STableId tableId = {.uid = pBlock->uid, .tid = pBlock->tid};
   STable *pTable = tsdbIsValidTableToInsert(pRepo->tsdbMeta, tableId);
   if (pTable == NULL) {
-    uError("failed to get table for insert, uid:%" PRIu64 ", tid:%d", tableId.uid, tableId.tid);
+    tsdbError("failed to get table for insert, uid:%" PRIu64 ", tid:%d", tableId.uid, tableId.tid);
     return TSDB_CODE_INVALID_TABLE_ID;
   }
 
-  SSubmitBlkIter blkIter;
-  SDataRow row;
+  SSubmitBlkIter blkIter = {0};
+  SDataRow row = NULL;
+
+  TSKEY minKey = now - tsMsPerDay[pRepo->config.precision] * pRepo->config.keep;
+  TSKEY maxKey = now + tsMsPerDay[pRepo->config.precision] * pRepo->config.daysPerFile;
 
   tsdbInitSubmitBlkIter(pBlock, &blkIter);
   while ((row = tsdbGetSubmitBlkNext(&blkIter)) != NULL) {
+    if (dataRowKey(row) < minKey || dataRowKey(row) > maxKey) {
+      tsdbError(
+          "tsdbId: %d, table tid: %d, talbe uid: %ld timestamp is out of range. now: %ld maxKey: %ld, minKey: %ld",
+          pRepo->config.tsdbId, pTable->tableId.tid, pTable->tableId.uid, now, minKey, maxKey);
+      return TSDB_CODE_TIMESTAMP_OUT_OF_RANGE;
+    }
+
     if (tdInsertRowToTable(pRepo, row, pTable) < 0) {
       return -1;
     }
@@ -903,6 +917,9 @@ static void *tsdbCommitData(void *arg) {
     }
   }
 
+  // Do retention actions
+  tsdbFitRetention(pRepo);
+
 _exit:
   tdFreeDataCols(pDataCols);
   tsdbDestroyTableIters(iters, pCfg->maxTables);
diff --git a/src/util/inc/tcoding.h b/src/util/inc/tcoding.h
new file mode 100644
index 0000000000000000000000000000000000000000..f3e7a5294233b73068197d31608fa9327a1e535e
--- /dev/null
+++ b/src/util/inc/tcoding.h
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef _TD_CODING_H_
+#define _TD_CODING_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <string.h>
+
+#include "tutil.h"
+
+const int TNUMBER = 1;
+#define IS_LITTLE_ENDIAN() (*(char *)(&TNUMBER) != 0)
+
+static FORCE_INLINE void *taosEncodeFixed16(void *buf, uint16_t value) {
+  if (IS_LITTLE_ENDIAN()) {
+    memcpy(buf, &value, sizeof(value));
+  } else {
+    ((char *)buf)[0] = value & 0xff;
+    ((char *)buf)[1] = (value >> 8) & 0xff;
+  }
+
+  return POINTER_DRIFT(buf, sizeof(value));
+}
+
+static FORCE_INLINE void *taosEncodeFixed32(void *buf, uint32_t value) {
+  if (IS_LITTLE_ENDIAN()) {
+    memcpy(buf, &value, sizeof(value));
+  } else {
+    ((char *)buf)[0] = value & 0xff;
+    ((char *)buf)[1] = (value >> 8) & 0xff;
+    ((char *)buf)[2] = (value >> 16) & 0xff;
+    ((char *)buf)[3] = (value >> 24) & 0xff;
+  }
+
+  return POINTER_DRIFT(buf, sizeof(value));
+}
+
+static FORCE_INLINE void *taosEncodeFixed64(void *buf, uint64_t value) {
+  if (IS_LITTLE_ENDIAN()) {
+    memcpy(buf, &value, sizeof(value));
+  } else {
+    ((char *)buf)[0] = value & 0xff;
+    ((char *)buf)[1] = (value >> 8) & 0xff;
+    ((char *)buf)[2] = (value >> 16) & 0xff;
+    ((char *)buf)[3] = (value >> 24) & 0xff;
+    ((char *)buf)[4] = (value >> 32) & 0xff;
+    ((char *)buf)[5] = (value >> 40) & 0xff;
+    ((char *)buf)[6] = (value >> 48) & 0xff;
+    ((char *)buf)[7] = (value >> 56) & 0xff;
+  }
+
+  return POINTER_DRIFT(buf, sizeof(value));
+}
+
+static FORCE_INLINE void *taosDecodeFixed16(void *buf, uint16_t *value) {
+  if (IS_LITTLE_ENDIAN()) {
+    memcpy(value, buf, sizeof(*value));
+  } else {
+    ((char *)value)[1] = ((char *)buf)[0];
+    ((char *)value)[0] = ((char *)buf)[1];
+  }
+
+  return POINTER_DRIFT(buf, sizeof(*value));
+}
+
+static FORCE_INLINE void *taosDecodeFixed32(void *buf, uint32_t *value) {
+  if (IS_LITTLE_ENDIAN()) {
+    memcpy(value, buf, sizeof(*value));
+  } else {
+    ((char *)value)[3] = ((char *)buf)[0];
+    ((char *)value)[2] = ((char *)buf)[1];
+    ((char *)value)[1] = ((char *)buf)[2];
+    ((char *)value)[0] = ((char *)buf)[3];
+  }
+
+  return POINTER_DRIFT(buf, sizeof(*value));
+}
+
+static FORCE_INLINE void *taosDecodeFixed64(void *buf, uint64_t *value) {
+  if (IS_LITTLE_ENDIAN()) {
+    memcpy(value, buf, sizeof(*value));
+  } else {
+    ((char *)value)[7] = ((char *)buf)[0];
+    ((char *)value)[6] = ((char *)buf)[1];
+    ((char *)value)[5] = ((char *)buf)[2];
+    ((char *)value)[4] = ((char *)buf)[3];
+    ((char *)value)[3] = ((char *)buf)[4];
+    ((char *)value)[2] = ((char *)buf)[5];
+    ((char *)value)[1] = ((char *)buf)[6];
+    ((char *)value)[0] = ((char *)buf)[7];
+  }
+
+  return POINTER_DRIFT(buf, sizeof(*value));
+}
+
+// TODO
+static FORCE_INLINE void *taosEncodeVariant16(void *buf, uint16_t value) {}
+static FORCE_INLINE void *taosEncodeVariant32(void *buf, uint32_t value) {}
+static FORCE_INLINE void *taosEncodeVariant64(void *buf, uint64_t value) {}
+static FORCE_INLINE void *taosDecodeVariant16(void *buf, uint16_t *value) {}
+static FORCE_INLINE void *taosDecodeVariant32(void *buf, uint32_t *value) {}
+static FORCE_INLINE void *taosDecodeVariant64(void *buf, uint64_t *value) {}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
\ No newline at end of file
diff --git a/src/util/inc/ttime.h b/src/util/inc/ttime.h
index 34c241cbc0f22afc511660cee475c82d08466599..61df65f345afc3085890cdcb8396ddba6a2fe857 100644
--- a/src/util/inc/ttime.h
+++ b/src/util/inc/ttime.h
@@ -22,22 +22,37 @@ extern "C" {
 
 #include <stdint.h>
 #include <time.h>
+#include "tutil.h"
 
 //@return timestamp in second
 int32_t taosGetTimestampSec();
 
 //@return timestamp in millisecond
-int64_t taosGetTimestampMs();
+static FORCE_INLINE int64_t taosGetTimestampMs() {
+  struct timeval systemTime;
+  gettimeofday(&systemTime, NULL);
+  return (int64_t)systemTime.tv_sec * 1000L + (uint64_t)systemTime.tv_usec / 1000;
+}
 
 //@return timestamp in microsecond
-int64_t taosGetTimestampUs();
+static FORCE_INLINE int64_t taosGetTimestampUs() {
+  struct timeval systemTime;
+  gettimeofday(&systemTime, NULL);
+  return (int64_t)systemTime.tv_sec * 1000000L + (uint64_t)systemTime.tv_usec;
+}
 
 /*
  * @return timestamp decided by global conf variable, tsTimePrecision
  * if precision == TSDB_TIME_PRECISION_MICRO, it returns timestamp in microsecond.
  *    precision == TSDB_TIME_PRECISION_MILLI, it returns timestamp in millisecond.
  */
-int64_t taosGetTimestamp(int32_t precision);
+static FORCE_INLINE int64_t taosGetTimestamp(int32_t precision) {
+  if (precision == TSDB_TIME_PRECISION_MICRO) {
+    return taosGetTimestampUs();
+  } else {
+    return taosGetTimestampMs();
+  }
+}
 
 int32_t getTimestampInUsFromStr(char* token, int32_t tokenlen, int64_t* ts);
 
diff --git a/src/util/src/ttime.c b/src/util/src/ttime.c
index 015cb19606ff11b5ddb857a1fc11299f224afd16..d34bf0e6ce922a09eb9941bb8cac9c98141a68cc 100644
--- a/src/util/src/ttime.c
+++ b/src/util/src/ttime.c
@@ -121,30 +121,6 @@ static int32_t parseLocaltime(char* timestr, int64_t* time, int32_t timePrec);
 
 int32_t taosGetTimestampSec() { return (int32_t)time(NULL); }
 
-int64_t taosGetTimestampMs() {
-  struct timeval systemTime;
-  gettimeofday(&systemTime, NULL);
-  return (int64_t)systemTime.tv_sec * 1000L + (uint64_t)systemTime.tv_usec / 1000;
-}
-
-int64_t taosGetTimestampUs() {
-  struct timeval systemTime;
-  gettimeofday(&systemTime, NULL);
-  return (int64_t)systemTime.tv_sec * 1000000L + (uint64_t)systemTime.tv_usec;
-}
-
-/*
- * If tsTimePrecision == 1, taosGetTimestamp will return timestamp in microsecond.
- * Otherwise, it will return timestamp in millisecond.
- */
-int64_t taosGetTimestamp(int32_t precision) {
-  if (precision == TSDB_TIME_PRECISION_MICRO) {
-    return taosGetTimestampUs();
-  } else {
-    return taosGetTimestampMs();
-  }
-}
-
 int32_t taosParseTime(char* timestr, int64_t* time, int32_t len, int32_t timePrec) {
   /* parse datatime string in with tz */
   if (strnchr(timestr, 'T', len, false) != NULL) {