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inSnailclimb/JavaGuide (press backspace or delete to remove)下图中第三步与第二步存在冲突,第三步应该是:根据 appendfsync 配置的策略(always、everysec 或 no),Redis 会适时地调用 fsync 系统调用,强制将 内核缓冲区中的数据同步到 物理硬盘中,确保数据持久化。
img width= 1571 height= 657 alt= Image src=
https://github.com/user-attachments/assets/45de9895-d951-47ac-9381-88311135e907 ...
doc-bug
bhhxx
- 1
- Opened 3 days ago
- #2706
字符串转日期格式 这里
LocalDateTime.parse( 2021-01-26 12:12:22 );
应该改为
LocalDateTime.parse( 2021-01-26T12:12:22 );
doc-bug
EmiyaLin
- 1
- Opened 19 days ago
- #2699
AOF 持久化方式有哪些? 这里提到的
appendfsync always:主线程调用 write 执行写操作后,后台线程( aof_fsync 线程)立即会调用 fsync 函数同步 AOF 文件(刷盘),fsync 完成后线程返回,这样会严重降低 Redis 的性能(write + fsync)
实际上可能是主线程直接调用 fsync,而没有用到后台线程。7.2版本源码中
try_fsync: ...
doc-bug
YangooSen
- 1
- Opened 24 days ago
- #2697
img width= 838 height= 191 alt= Image src=
https://github.com/user-attachments/assets/280d073f-c8dc-4e0a-812e-f33230d12eb1 /
关于文章中提到的,同步非阻塞 IO。容易有一点误解,轮询也是会占用线程的使用时间的。
实际上的轮询,不是一直在轮询,而是一个隔一段时间,进行一个询问。 ...
blueair5
- Opened on Jul 13
- #2695
我用 n8n 准备将每个章节的内容整理成播客。可以方便路上收听 https://www.xiaoyuzhoufm.com/episodes/6868747593fd2d72b89958f0
licc168
- 3
- Opened on Jul 5
- #2692
再来看一个常见的面试题:如果有索引 联合索引(a,b,c),查询 a=1 AND c=1 会走索引么?c=1 呢?b=1 AND c=1 呢?
我认为可以增加一个示例,如果是 a = 1 AND c = 1 AND b = 1 的情况下,这个会走索引吗?我在实际的工作中,以为这个只有 a = 1 走了部分索引,实际根据 explain 的执行结果,都走了索引。同理 b = 1
AND c = 1 ...
blueair5
- Opened on Jun 30
- #2686
1693750531
- Opened on Jun 28
- #2684

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