[TD-4119]<fix>

src/mnode/inc/mnodeDef.h

@@ -249,7 +249,7 @@ typedef struct SAcctObj {
 } SAcctObj;
 
 typedef struct {
-  char     db[TSDB_DB_NAME_LEN];
+  char     db[TSDB_ACCT_ID_LEN + TSDB_DB_NAME_LEN];
   int8_t   type;
   int16_t  numOfColumns;
   int32_t  index;

src/mnode/src/mnodeShow.c

@@ -129,7 +129,7 @@ static int32_t mnodeProcessShowMsg(SMnodeMsg *pMsg) {
   SShowObj *pShow = calloc(1, showObjSize);
   pShow->type       = pShowMsg->type;
   pShow->payloadLen = htons(pShowMsg->payloadLen);
-  tstrncpy(pShow->db, pShowMsg->db, TSDB_DB_NAME_LEN);
+  tstrncpy(pShow->db, pShowMsg->db, TSDB_ACCT_ID_LEN + TSDB_DB_NAME_LEN);
   memcpy(pShow->payload, pShowMsg->payload, pShow->payloadLen);
 
   pShow = mnodePutShowObj(pShow);