Test some common commands of Redis

In the previous article, we tested and tested the existing redis data structure (see ). We will test some common redis commands today:

You need to check the data volume of the current database. There are three methods: keys *, dbsize, and info (there are many data parameters, which are also frequently used recently)

1. [Root @ fsailing1 bin] #./redis-cli
2. Redis 127.0.0.1: 6379>Keys *
3. 1) "key2"
4. 2) "age"
5. 3) "ss"
6. 4) "test"
7. 5) "name"
8. 6) "key1"
9. Redis 127.0.0.1: 6379>Dbsize
10. (Integer) 6
11. Redis 127.0.0.1: 6379>Info
12. Redis_version: 2.4.15
13. Redis_git_sha1: 00000000
14. Vm_enabled: 0
15. Role: master
16. Db0: keys=6,Expires=0
17. Db1: keys=5,Expires=0

When you view a key value, exists deletes a key value and del

1. Redis 127.0.0.1: 6379>Exists age
2. (Integer) 1
3. Redis 127.0.0.1: 6379>Exists chen
4. (Integer) 0
5. Redis 127.0.0.1: 6379>Del age
6. (Integer) 1
7. Redis 127.0.0.1: 6379>Exists age
8. (Integer) 0

Rename/renamenx

1. Redis 127.0.0.1: 6379>Keys *
2. 1) "key2"
3. 2) "ss"
4. 3) "test"
5. 4) "name"
6. 5) "key1"
7. Redis 127.0.0.1: 6379>Rename ss chen
8. OK
9. Redis 127.0.0.1: 6379>Renamenx key1 chen
10. (Integer) 0
11. Redis 127.0.0.1: 6379>Keys *
12. 1) "key2"
13. 2) "chen"
14. 3) "test"
15. 4) "name"
16. 5) "key1"

Another command to set the expiration time and persistent expire/persist is to view the current situation. ttl means time to live.

1. Redis 127.0.0.1: 6379>Keys *
2. 1) "key2"
3. 2) "ss"
4. 3) "test"
5. 4) "name"
6. 5) "key1"
7. Redis 127.0.0.1: 6379>Rename ss chen
8. OK
9. Redis 127.0.0.1: 6379>Renamenx key1 chen
10. (Integer) 0
11. Redis 127.0.0.1: 6379>Keys *
12. 1) "key2"
13. 2) "chen"
14. 3) "test"
15. 4) "name"
16. 5) "key1"
17. Redis 127.0.0.1: 6379>Expire chen 10
18. (Integer) 1
19. Redis 127.0.0.1: 6379>Ttl chen
20. (Integer) 6
21. Redis 127.0.0.1: 6379>Ttl chen
22. (Integer) 4
23. Redis 127.0.0.1: 6379>Ttl chen
24. (Integer) 2
25. Redis 127.0.0.1: 6379>Keys *
26. 1) "key2"
27. 2) "test"
28. 3) "name"
29. 4) "key1"
30. Redis 127.0.0.1: 6379>Expire test 100
31. (Integer) 1
32. Redis 127.0.0.1: 6379>Ttl test
33. (Integer) 94
34. Redis 127.0.0.1: 6379>Persist test
35. (Integer) 1
36. Redis 127.0.0.1: 6379>Ttl test
37. (Integer)-1

In addition, redis has 16 inventories by default. How can we choose and use redis: select move

1. Redis 127.0.0.1: 6379 [19]>Select 15
2. OK
3. Redis 127.0.0.1: 6379 [15]>Select 16
4. (Error) ERR invalid DB index

1. Redis 127.0.0.1: 6379>Keys *
2. 1) "key2"
3. 2) "test"
4. 3) "name"
5. 4) "key1"
6. Redis 127.0.0.1: 6379>Move key1 1
7. (Integer) 1
8. Redis 127.0.0.1: 6379>Select 1
9. OK
10. Redis 127.0.0.1: 6379 [1]>Keys *
11. 1) "test3"
12. 2) "test"
13. 3) "key1"
14. 4) "test2"
15. 5) "myhash"
16. 6) "mylist"
17. Redis 127.0.0.1: 6379 [1]>Select 0
18. OK
19. Redis 127.0.0.1: 6379>Keys *
20. 1) "key2"
21. 2) "test"
22. 3) "name"

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