robj *dsGet(redisDb *db, robj *key, time_t *expire);
int dsDel(redisDb *db, robj *key);
int dsExists(redisDb *db, robj *key);
-int dsFlushDb(int dbid);
+void dsFlushDb(int dbid);
/* Disk Store Cache */
void dsInit(void);
void cacheScheduleIO(redisDb *db, robj *key, int type);
void cacheCron(void);
int cacheKeyMayExist(redisDb *db, robj *key);
-void cacheSetKeyExists(redisDb *db, robj *key);
+void cacheSetKeyMayExist(redisDb *db, robj *key);
void cacheSetKeyDoesNotExist(redisDb *db, robj *key);
/* Set data type */