diff --git a/src/common/src/tglobal.c b/src/common/src/tglobal.c
index c067159b3bd49891463d33c934806a147d4414fd..e4d7d5af70f4a3b6ba51447448f18ed60f4c2250 100644
--- a/src/common/src/tglobal.c
+++ b/src/common/src/tglobal.c
@@ -850,7 +850,7 @@ static void doInitGlobalConfig(void) {
   cfg.valType = TAOS_CFG_VTYPE_INT32;
   cfg.cfgType = TSDB_CFG_CTYPE_B_CONFIG | TSDB_CFG_CTYPE_B_SHOW;
   cfg.minValue = -1;
-  cfg.maxValue = 10000000000000.0;  //10TB
+  cfg.maxValue = 500000000000.0;
   cfg.ptrLength = 0;
   cfg.unitType = TAOS_CFG_UTYPE_BYTE;
   taosInitConfigOption(cfg);