diff --git a/include/common/tglobal.h b/include/common/tglobal.h
index 49d8f84d3806c6e97c901de062a2af55e49a9cc9..b7f8721459ff329a4536ed36687a48f5b7bc84e1 100644
--- a/include/common/tglobal.h
+++ b/include/common/tglobal.h
@@ -23,8 +23,6 @@ extern "C" {
 #include "tdef.h"
 
 // common
-extern int32_t  tsMaxConnections;
-extern int32_t  tsMaxShellConns;
 extern int32_t  tsShellActivityTimer;
 extern uint32_t tsMaxTmrCtrl;
 extern float    tsNumOfThreadsPerCore;
diff --git a/source/client/src/clientCfg.c b/source/client/src/clientCfg.c
index ca671ab150620b4be66c15699a6ad906cfd3cbd1..22b1407a15691a9424ca1e769c563586762513ac 100644
--- a/source/client/src/clientCfg.c
+++ b/source/client/src/clientCfg.c
@@ -159,8 +159,9 @@ static int32_t tscAddCfg(SConfig *pCfg) {
   if (cfgAddInt32(pCfg, "statusInterval", 1, 1, 30) != 0) return -1;
   if (cfgAddFloat(pCfg, "numOfThreadsPerCore", 1, 0, 10) != 0) return -1;
   if (cfgAddFloat(pCfg, "ratioOfQueryCores", 1, 0, 5) != 0) return -1;
-  if (cfgAddInt32(pCfg, "maxShellConns", 50000, 10, 50000000) != 0) return -1;
   if (cfgAddInt32(pCfg, "shellActivityTimer", 3, 1, 120) != 0) return -1;
+
+  if (cfgAddInt32(pCfg, "maxConnections", 50000, 1, 100000) != 0) return -1;
   return 0;
 }
 
diff --git a/source/client/src/clientEnv.c b/source/client/src/clientEnv.c
index c7640e90d8a0e81b6fe4c46ccabf0ce9a590034d..37227cea6f595497e043441bd123f86b34576d98 100644
--- a/source/client/src/clientEnv.c
+++ b/source/client/src/clientEnv.c
@@ -90,7 +90,7 @@ void* openTransporter(const char *user, const char *auth, int32_t numOfThread) {
   rpcInit.label = "TSC";
   rpcInit.numOfThreads = numOfThread;
   rpcInit.cfp = processMsgFromServer;
-  rpcInit.sessions = tsMaxConnections;
+  rpcInit.sessions = cfgGetItem(tscCfg, "maxConnections")->i32;
   rpcInit.connType = TAOS_CONN_CLIENT;
   rpcInit.user = (char *)user;
   rpcInit.idleTime = tsShellActivityTimer * 1000;
diff --git a/source/common/src/tglobal.c b/source/common/src/tglobal.c
index 0042239e1aa07c32090bcf6687e70b0a3108902a..f9f00fa9a30b4cdb3519a7f4638914180c36e525 100644
--- a/source/common/src/tglobal.c
+++ b/source/common/src/tglobal.c
@@ -29,8 +29,6 @@
 
 
 // common
-int32_t tsMaxShellConns = 50000;
-int32_t tsMaxConnections = 50000;
 int32_t tsShellActivityTimer = 3;  // second
 float   tsNumOfThreadsPerCore = 1.0f;
 int32_t tsNumOfCommitThreads = 4;
@@ -440,16 +438,6 @@ static void doInitGlobalConfig(void) {
   taosAddConfigOption(cfg);
 
 
-  cfg.option = "maxConnections";
-  cfg.ptr = &tsMaxConnections;
-  cfg.valType = TAOS_CFG_VTYPE_INT32;
-  cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_SHOW;
-  cfg.minValue = 1;
-  cfg.maxValue = 100000;
-  cfg.ptrLength = 0;
-  cfg.unitType = TAOS_CFG_UTYPE_NONE;
-  taosAddConfigOption(cfg);
-
   cfg.option = "minimalLogDirGB";
   cfg.ptr = &tsMinimalLogDirGB;
   cfg.valType = TAOS_CFG_VTYPE_FLOAT;
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 5508b5ecd713016a4d228a7087d34faaadddc38f..b35ce9e7c37f67186cbcf8819cbef793221d8456 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -5301,7 +5301,7 @@ SOperatorInfo* createExchangeOperatorInfo(const SArray* pSources, const SArray*
     rpcInit.label = "EX";
     rpcInit.numOfThreads = 1;
     rpcInit.cfp = qProcessFetchRsp;
-    rpcInit.sessions = tsMaxConnections;
+    rpcInit.sessions = 50000; //tsMaxConnections;
     rpcInit.connType = TAOS_CONN_CLIENT;
     rpcInit.user = (char *)"root";
     rpcInit.idleTime = tsShellActivityTimer * 1000;
diff --git a/source/libs/qcom/src/queryUtil.c b/source/libs/qcom/src/queryUtil.c
index 4cd040c238931cb228ffcc4ebb6fb1fd3e781f17..9b381ad82375fb5b1a3b90e87a1f42f343a5bc19 100644
--- a/source/libs/qcom/src/queryUtil.c
+++ b/source/libs/qcom/src/queryUtil.c
@@ -87,7 +87,7 @@ int32_t initTaskQueue() {
   double factor = 4.0;
   int32_t numOfThreads = TMAX((int)(tsNumOfCores * tsNumOfThreadsPerCore / factor), 2);
 
-  int32_t queueSize = tsMaxConnections * 2;
+  int32_t queueSize = 25000; //tsMaxConnections * 2;
   pTaskQueue = taosInitScheduler(queueSize, numOfThreads, "tsc");
   if (NULL == pTaskQueue) {
     qError("failed to init task queue");