我正在编写一个简单的程序来测试 Redis:
#include <hiredis.h>
#include <cstdio>
int main()
{
redisContext * c = redisConnect("127.0.0.1", 6379);
redisReply * reply;
reply = redisCommand(c, "FLUSHALL");
freeReplyObject(reply);
for(long int i = 0; i <= 1000000; i++)
{
char query[64];
sprintf(query, "SET %ld \"string%ld\"", i, i);
reply = redisCommand(c, query);
freeReplyObject(reply);
if( !(i % 100000) )
{
reply = redisCommand(c, "DBSIZE");
int res = reply->integer;
freeReplyObject(reply);
printf("%s\n", query);
printf("dbsize: %d\n", res);
}
}
redisFree(c);
}
它应该将 1000000 个键放入 db,但输出如下:
SET 0 "string0"
dbsize: 1
SET 100000 "string100000"
dbsize: 100001
SET 200000 "string200000"
dbsize: 200001
SET 300000 "string300000"
dbsize: 300001
SET 400000 "string400000"
dbsize: 400001
SET 500000 "string500000"
dbsize: 500001
SET 600000 "string600000"
dbsize: 600001
SET 700000 "string700000"
dbsize: 700001
SET 800000 "string800000"
dbsize: 779479
SET 900000 "string900000"
dbsize: 779479
SET 1000000 "string1000000"
dbsize: 779479
所以在一瞬间(通常大约在 600000 个键之后)Redis 停止添加记录。这种行为的原因是什么?