假设在redis中,有以下类型为string的键值对: key1 val1 key2 val2 我知道它们存储在表内部。
这些键值对是否存储在一个表中? 或每个键值对有不同的表格吗?
即,只有一个表包含键值对,还是只有一个表存储key1-val1而另一个表存储key2-val2?
答案 0 :(得分:5)
同一个Redis DB中的所有键值对只有一个表。
实际上,键值对存储在一个大的哈希表中。
https://github.com/antirez/redis/blob/unstable/src/redis.h#L469
/* Redis database representation. There are multiple databases identified
* by integers from 0 (the default database) up to the max configured
* database. The database number is the 'id' field in the structure. */
typedef struct redisDb {
dict *dict; /* The keyspace for this DB */
dict *expires; /* Timeout of keys with a timeout set */
dict *blocking_keys; /* Keys with clients waiting for data (BLPOP) */
dict *ready_keys; /* Blocked keys that received a PUSH */
dict *watched_keys; /* WATCHED keys for MULTI/EXEC CAS */
struct evictionPoolEntry *eviction_pool; /* Eviction pool of keys */
int id; /* Database ID */
long long avg_ttl; /* Average TTL, just for stats */
} redisDb;
所有键值对都存储在dict中。