diff --git a/packaging/tools/install_client.sh b/packaging/tools/install_client.sh
index 605944e9b3d3a296b9cd6ce252224d3702e57fc8..0ec8dbd0cce46cd6861ef4f93b4b180df949a65f 100755
--- a/packaging/tools/install_client.sh
+++ b/packaging/tools/install_client.sh
@@ -31,6 +31,7 @@ cfg_install_dir="/etc/taos"
 if [ "$osType" != "Darwin" ]; then
     bin_link_dir="/usr/bin"
     lib_link_dir="/usr/lib"
+    lib64_link_dir="/usr/lib64"
     inc_link_dir="/usr/include"
 else
     bin_link_dir="/usr/local/bin"
@@ -45,7 +46,7 @@ install_main_dir="/usr/local/taos"
 bin_dir="/usr/local/taos/bin"
 
 # v1.5 jar dir
-v15_java_app_dir="/usr/local/lib/taos"
+#v15_java_app_dir="/usr/local/lib/taos"
 
 # Color setting
 RED='\033[0;31m'
@@ -90,7 +91,7 @@ function install_bin() {
 
   ${csudo} cp -r ${script_dir}/bin/* ${install_main_dir}/bin && ${csudo} chmod 0555 ${install_main_dir}/bin/*
 
-    #Make link
+  #Make link
   [ -x ${install_main_dir}/bin/taos ] && ${csudo} ln -s ${install_main_dir}/bin/taos ${bin_link_dir}/taos                 || :
   if [ "$osType" == "Darwin" ]; then
       [ -x ${install_main_dir}/bin/taosdump ] && ${csudo} ln -s ${install_main_dir}/bin/taosdump ${bin_link_dir}/taosdump || :
@@ -106,13 +107,16 @@ function clean_lib() {
 function install_lib() {
     # Remove links
     ${csudo} rm -f ${lib_link_dir}/libtaos.*         || :
-    ${csudo} rm -rf ${v15_java_app_dir}                         || :
+    ${csudo} rm -f ${lib64_link_dir}/libtaos.*       || :
+    #${csudo} rm -rf ${v15_java_app_dir}              || :
 
     ${csudo} cp -rf ${script_dir}/driver/* ${install_main_dir}/driver && ${csudo} chmod 777 ${install_main_dir}/driver/*
 
     if [ "$osType" != "Darwin" ]; then
         ${csudo} ln -s ${install_main_dir}/driver/libtaos.* ${lib_link_dir}/libtaos.so.1
         ${csudo} ln -s ${lib_link_dir}/libtaos.so.1 ${lib_link_dir}/libtaos.so
+        ${csudo} ln -s ${install_main_dir}/driver/libtaos.* ${lib64_link_dir}/libtaos.so.1       || :
+        ${csudo} ln -s ${lib64_link_dir}/libtaos.so.1 ${lib64_link_dir}/libtaos.so               || :
     else
         ${csudo} ln -s ${install_main_dir}/driver/libtaos.* ${lib_link_dir}/libtaos.1.dylib
         ${csudo} ln -s ${lib_link_dir}/libtaos.1.dylib ${lib_link_dir}/libtaos.dylib
diff --git a/packaging/tools/remove.sh b/packaging/tools/remove.sh
index 9fb8731449ec4db6a56e617febd6e073119e3f21..63e09dc56894a4e035c691be29b2bbc34e48bd7c 100755
--- a/packaging/tools/remove.sh
+++ b/packaging/tools/remove.sh
@@ -18,11 +18,12 @@ log_link_dir="/usr/local/taos/log"
 cfg_link_dir="/usr/local/taos/cfg"
 bin_link_dir="/usr/bin"
 lib_link_dir="/usr/lib"
+lib64_link_dir="/usr/lib64"
 inc_link_dir="/usr/include"
 install_nginxd_dir="/usr/local/nginxd"
 
 # v1.5 jar dir
-v15_java_app_dir="/usr/local/lib/taos"
+#v15_java_app_dir="/usr/local/lib/taos"
 
 service_config_dir="/etc/systemd/system"
 taos_service_name="taosd"
@@ -78,7 +79,8 @@ function clean_bin() {
 function clean_lib() {
     # Remove link
     ${csudo} rm -f ${lib_link_dir}/libtaos.*      || :
-    ${csudo} rm -rf ${v15_java_app_dir}                      || :
+    ${csudo} rm -f ${lib64_link_dir}/libtaos.*    || :
+    #${csudo} rm -rf ${v15_java_app_dir}           || :
 }
 
 function clean_header() {
diff --git a/packaging/tools/remove_client.sh b/packaging/tools/remove_client.sh
index 9210546a9f407fd821a176cadfcf88ae8023dc2f..4bc278fcf06ec18534535547f2c60ae156bc5da1 100755
--- a/packaging/tools/remove_client.sh
+++ b/packaging/tools/remove_client.sh
@@ -15,11 +15,12 @@ log_link_dir="/usr/local/taos/log"
 cfg_link_dir="/usr/local/taos/cfg"
 bin_link_dir="/usr/bin"
 lib_link_dir="/usr/lib"
+lib64_link_dir="/usr/lib64"
 inc_link_dir="/usr/include"
 
 
 # v1.5 jar dir
-v15_java_app_dir="/usr/local/lib/taos"
+#v15_java_app_dir="/usr/local/lib/taos"
 
 csudo=""
 if command -v sudo > /dev/null; then
@@ -43,7 +44,8 @@ function clean_bin() {
 function clean_lib() {
     # Remove link
     ${csudo} rm -f ${lib_link_dir}/libtaos.*      || :
-    ${csudo} rm -rf ${v15_java_app_dir}                      || :
+    ${csudo} rm -f ${lib64_link_dir}/libtaos.*    || :
+    #${csudo} rm -rf ${v15_java_app_dir}           || :
 }
 
 function clean_header() {
diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 8e398fbf1fe63207254caed0f1918761373bce8f..bcf43a1a8b01a1d07845defce56f68647f81259b 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -5996,7 +5996,12 @@ int32_t doCheckForQuery(SSqlObj* pSql, SQuerySQL* pQuerySql, int32_t index) {
       return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg11);
     }
 
-    tstrncpy(pTableMetaInfo1->aliasName, pTableItem1->pz, sizeof(pTableMetaInfo1->aliasName));
+    // has no table alias name
+    if (memcmp(pTableItem->pz, pTableItem1->pz, pTableItem1->nLen) == 0) {
+      extractTableName(pTableMetaInfo1->name, pTableMetaInfo1->aliasName);
+    } else {
+      tstrncpy(pTableMetaInfo1->aliasName, pTableItem1->pz, sizeof(pTableMetaInfo1->aliasName));
+    }
 
     code = tscGetTableMeta(pSql, pTableMetaInfo1);
     if (code != TSDB_CODE_SUCCESS) {
diff --git a/src/dnode/inc/dnodeCheck.h b/src/dnode/inc/dnodeCheck.h
new file mode 100644
index 0000000000000000000000000000000000000000..a4880b3c114342c8900337372bd1dfd07e7815b7
--- /dev/null
+++ b/src/dnode/inc/dnodeCheck.h
@@ -0,0 +1,30 @@
+/*
+ * 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 TDENGINE_DNODE_CHECK_H
+#define TDENGINE_DNODE_CHECK_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int32_t dnodeInitCheck();
+void    dnodeCleanupCheck();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/src/dnode/src/dnodeCheck.c b/src/dnode/src/dnodeCheck.c
new file mode 100644
index 0000000000000000000000000000000000000000..dfdc3fa53fe7ef01c3cb95c6bd8295251909bc03
--- /dev/null
+++ b/src/dnode/src/dnodeCheck.c
@@ -0,0 +1,269 @@
+/*
+ * 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/>.
+ */
+
+#define _DEFAULT_SOURCE
+#include "os.h"
+#include "taosdef.h"
+#include "tglobal.h"
+#include "mnode.h"
+#include "dnodeInt.h"
+#include "dnodeCheck.h"
+
+typedef struct {
+  bool      enable;
+  char *    name;
+  int32_t (*initFp)();
+  int32_t (*startFp)();
+  void    (*cleanUpFp)();
+  void    (*stopFp)();
+} SCheckItem;
+
+static    SCheckItem  tsCheckItem[TSDB_CHECK_ITEM_MAX] = {{0}};
+int64_t   tsMinFreeMemSizeForStart = 0;
+
+static int bindTcpPort(int port) {
+  int    serverSocket;
+  struct sockaddr_in server_addr;
+
+  if ((serverSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
+    dError("socket() fail: %s", strerror(errno));
+    return -1;
+  }
+
+  bzero(&server_addr, sizeof(server_addr));
+  server_addr.sin_family = AF_INET;
+  server_addr.sin_port = htons(port);
+  server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
+
+  if (bind(serverSocket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
+    dError("port:%d tcp bind() fail: %s", port, strerror(errno));
+    close(serverSocket);
+    return -1;
+  }
+
+  if (listen(serverSocket, 5) < 0) {
+    dError("port:%d listen() fail: %s", port, strerror(errno));
+    close(serverSocket);
+    return -1;
+  }
+
+  close(serverSocket);
+  return 0;
+}
+
+static int bindUdpPort(int port) {
+  int    serverSocket;
+  struct sockaddr_in server_addr;
+    
+  if ((serverSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
+    dError("socket() fail: %s", strerror(errno));
+    return -1;
+  }
+
+  bzero(&server_addr, sizeof(server_addr));
+  server_addr.sin_family = AF_INET;
+  server_addr.sin_port = htons(port);
+  server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
+
+  if (bind(serverSocket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
+    dError("port:%d udp bind() fail: %s", port, strerror(errno));
+    close(serverSocket);
+    return -1;
+  }
+
+  close(serverSocket);
+  return 0;
+}
+
+static int dnodeCheckNetwork() {
+  int ret;
+  int startPort = tsServerPort;
+
+  for (int port = startPort; port < startPort + 12; port++) {
+    ret = bindTcpPort(port);
+    if (0 != ret) {
+      dError("failed to tcp bind port %d, quit", port);
+      return -1;
+    }
+    ret = bindUdpPort(port);
+    if (0 != ret) {
+      dError("failed to udp bind port %d, quit", port);
+      return -1;
+    }    
+  } 
+
+  return 0;
+}
+
+static int dnodeCheckMem() {
+  float  memoryUsedMB;
+  float  memoryAvailMB;
+  if (true != taosGetSysMemory(&memoryUsedMB)) {
+    dError("failed to get system mem infomation, errno:%u, reason:%s", errno, strerror(errno));
+    return -1;
+  }
+
+  memoryAvailMB = (float)tsTotalMemoryMB - memoryUsedMB;
+
+  if (memoryAvailMB < tsMinFreeMemSizeForStart) {
+    dError("free mem %f too little, quit", memoryAvailMB);
+    return -1;
+  }
+
+  return 0;  
+}
+
+static int dnodeCheckCpu() {
+  // TODO:  
+  return 0;
+}
+
+static int dnodeCheckDisk() {
+  if (tsAvailDataDirGB < tsMinimalDataDirGB) {
+    dError("free disk size: %f GB, too little, quit", tsAvailDataDirGB);
+    return -1;
+  }
+
+  if (tsAvailLogDirGB < tsMinimalLogDirGB) {
+    dError("free disk size: %f GB, too little, quit", tsAvailLogDirGB);
+    return -1;
+  }
+
+  if (tsAvailTmpDirectorySpace < tsReservedTmpDirectorySpace) {
+    dError("free disk size: %f GB, too little, quit", tsAvailTmpDirectorySpace);
+    return -1;
+  }
+
+  return 0;
+}
+
+static int dnodeCheckOs() {
+  // TODO:
+
+  return 0;
+}
+static int dnodeCheckAccess() {
+  // TODO:
+
+  return 0;
+}
+
+static int dnodeCheckVersion() {
+  // TODO:
+
+  return 0;
+}
+
+static int dnodeCheckDatafile() {
+  // TODO:
+
+  return 0;
+}
+
+static void dnodeAllocCheckItem() {
+  tsCheckItem[TSDB_CHECK_ITEM_NETWORK].enable       = false;
+  tsCheckItem[TSDB_CHECK_ITEM_NETWORK].name         = "network";
+  tsCheckItem[TSDB_CHECK_ITEM_NETWORK].initFp       = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_NETWORK].cleanUpFp    = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_NETWORK].startFp      = dnodeCheckNetwork;
+  tsCheckItem[TSDB_CHECK_ITEM_NETWORK].stopFp       = NULL;
+
+  tsCheckItem[TSDB_CHECK_ITEM_MEM].enable       = true;
+  tsCheckItem[TSDB_CHECK_ITEM_MEM].name         = "mem";
+  tsCheckItem[TSDB_CHECK_ITEM_MEM].initFp       = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_MEM].cleanUpFp    = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_MEM].startFp      = dnodeCheckMem;
+  tsCheckItem[TSDB_CHECK_ITEM_MEM].stopFp       = NULL;
+
+  tsCheckItem[TSDB_CHECK_ITEM_CPU].enable       = true;
+  tsCheckItem[TSDB_CHECK_ITEM_CPU].name         = "cpu";
+  tsCheckItem[TSDB_CHECK_ITEM_CPU].initFp       = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_CPU].cleanUpFp    = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_CPU].startFp      = dnodeCheckCpu;
+  tsCheckItem[TSDB_CHECK_ITEM_CPU].stopFp       = NULL;
+
+  tsCheckItem[TSDB_CHECK_ITEM_DISK].enable       = true;
+  tsCheckItem[TSDB_CHECK_ITEM_DISK].name         = "disk";
+  tsCheckItem[TSDB_CHECK_ITEM_DISK].initFp       = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_DISK].cleanUpFp    = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_DISK].startFp      = dnodeCheckDisk;
+  tsCheckItem[TSDB_CHECK_ITEM_DISK].stopFp       = NULL;
+
+  tsCheckItem[TSDB_CHECK_ITEM_OS].enable       = true;
+  tsCheckItem[TSDB_CHECK_ITEM_OS].name         = "os";
+  tsCheckItem[TSDB_CHECK_ITEM_OS].initFp       = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_OS].cleanUpFp    = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_OS].startFp      = dnodeCheckOs;
+  tsCheckItem[TSDB_CHECK_ITEM_OS].stopFp       = NULL;
+
+  tsCheckItem[TSDB_CHECK_ITEM_ACCESS].enable       = true;
+  tsCheckItem[TSDB_CHECK_ITEM_ACCESS].name         = "access";
+  tsCheckItem[TSDB_CHECK_ITEM_ACCESS].initFp       = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_ACCESS].cleanUpFp    = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_ACCESS].startFp      = dnodeCheckAccess;
+  tsCheckItem[TSDB_CHECK_ITEM_ACCESS].stopFp       = NULL;
+
+  tsCheckItem[TSDB_CHECK_ITEM_VERSION].enable       = true;
+  tsCheckItem[TSDB_CHECK_ITEM_VERSION].name         = "version";
+  tsCheckItem[TSDB_CHECK_ITEM_VERSION].initFp       = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_VERSION].cleanUpFp    = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_VERSION].startFp      = dnodeCheckVersion;
+  tsCheckItem[TSDB_CHECK_ITEM_VERSION].stopFp       = NULL;
+
+  tsCheckItem[TSDB_CHECK_ITEM_DATAFILE].enable       = true;
+  tsCheckItem[TSDB_CHECK_ITEM_DATAFILE].name         = "datafile";
+  tsCheckItem[TSDB_CHECK_ITEM_DATAFILE].initFp       = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_DATAFILE].cleanUpFp    = NULL;
+  tsCheckItem[TSDB_CHECK_ITEM_DATAFILE].startFp      = dnodeCheckDatafile;
+  tsCheckItem[TSDB_CHECK_ITEM_DATAFILE].stopFp       = NULL;
+}
+
+void dnodeCleanupCheck() {
+  for (ECheckItemType index = 0; index < TSDB_CHECK_ITEM_MAX; ++index) {
+    if (tsCheckItem[index].enable && tsCheckItem[index].stopFp) {
+      (*tsCheckItem[index].stopFp)();
+    }
+    if (tsCheckItem[index].cleanUpFp) {
+      (*tsCheckItem[index].cleanUpFp)();
+    }
+  }
+}
+
+int32_t dnodeInitCheck() {
+  dnodeAllocCheckItem();
+
+  for (ECheckItemType index = 0; index < TSDB_CHECK_ITEM_MAX; ++index) {
+    if (tsCheckItem[index].initFp) {
+      if ((*tsCheckItem[index].initFp)() != 0) {
+        dError("failed to init check item:%s", tsCheckItem[index].name);
+        return -1;
+      }
+    }
+  }
+
+  for (ECheckItemType index = 0; index < TSDB_CHECK_ITEM_MAX; ++index) {
+    if (tsCheckItem[index].enable && tsCheckItem[index].startFp) {
+      if ((*tsCheckItem[index].startFp)() != 0) {
+        dError("failed to check item:%s", tsCheckItem[index].name);
+        exit(-1);
+      }
+    }
+  }
+
+  return 0;
+}
+
+
+
diff --git a/src/dnode/src/dnodeMain.c b/src/dnode/src/dnodeMain.c
index 96f8f43265e30a75db2477e050eed54d66dc3399..dded10bd1c7c8e1ea0448e942175e92b7e09a169 100644
--- a/src/dnode/src/dnodeMain.c
+++ b/src/dnode/src/dnodeMain.c
@@ -24,6 +24,7 @@
 #include "dnodeMgmt.h"
 #include "dnodePeer.h"
 #include "dnodeModule.h"
+#include "dnodeCheck.h"
 #include "dnodeVRead.h"
 #include "dnodeVWrite.h"
 #include "dnodeMRead.h"
@@ -48,6 +49,7 @@ typedef struct {
 } SDnodeComponent;
 
 static const SDnodeComponent tsDnodeComponents[] = {
+  {"check",     dnodeInitCheck,      dnodeCleanupCheck},     // NOTES: dnodeInitCheck must be first component !!!
   {"storage",   dnodeInitStorage,    dnodeCleanupStorage},
   {"vread",     dnodeInitVnodeRead,  dnodeCleanupVnodeRead},
   {"vwrite",    dnodeInitVnodeWrite, dnodeCleanupVnodeWrite},
diff --git a/src/inc/taosdef.h b/src/inc/taosdef.h
index aa594183478c3c7dc924531525ec5a6ca98ab750..f8b9d0ee7954b1a6d0b83a903970de44c06ce0ba 100644
--- a/src/inc/taosdef.h
+++ b/src/inc/taosdef.h
@@ -416,6 +416,19 @@ typedef enum {
   TSDB_MOD_MAX
 } EModuleType;
 
+  typedef enum {
+    TSDB_CHECK_ITEM_NETWORK,
+    TSDB_CHECK_ITEM_MEM,
+    TSDB_CHECK_ITEM_CPU,
+    TSDB_CHECK_ITEM_DISK,
+    TSDB_CHECK_ITEM_OS,    
+    TSDB_CHECK_ITEM_ACCESS,    
+    TSDB_CHECK_ITEM_VERSION,
+    TSDB_CHECK_ITEM_DATAFILE,
+    TSDB_CHECK_ITEM_MAX
+  } ECheckItemType;
+
+
 #ifdef __cplusplus
 }
 #endif