2_Redis.pptx very useful for begginers yes
- 2. What Redis ? • Redis is a database API Server Blog Post Images Bytes comments
- 3. Redis is Fast Why use Redis ?
- 4. Why is Redis fast ? 1 All data is stored in memory 2 Data is organized in simple data structure 3 Redis has simple feature set
- 5. Traditional Database Memory Hard Drive Dataset API Server Fast Slow
- 6. Traditional Database Memory Hard Drive Dataset API Server Fast
- 7. Why is Redis fast ? 1 All data is stored in memory 2 Data is organized in simple data structure 3 Redis has simple feature set
- 9. Why is Redis fast ? 1 All data is stored in memory 2 Data is organized in simple data structure 3 Redis has simple feature set
- 10. Traditional Data Feature set Enforced data schema Triggers Foreign Key constraints Uniqueness of arbitrary properties SQL support Transaction rollback Redis Features Set … Not Much
- 11. Why is Redis fast ? 1 All data is stored in memory 2 Data is organized in simple data structure 3 Redis has simple feature set Because of these reason Redis is different than other databases !
- 12. Do not skip this video! Required setup in here, even if you already have a running copy of Redis
- 13. Setup Redis Install Redis Cloud redis.com Install + run on your local computer
- 14. Commands
- 15. Data Structures
- 16. Structure Type What it contains Structure read/write ability STRING Strings, integers, or floating-point values Operate on the whole string, parts, increment/ decrement the integers and floats LIST Linked list of strings Push or pop items from both ends, trim based on offsets, read individual or multiple items, find or remove items by value SET Unordered collection of unique Strings Add, fetch, or remove individual items, check membership, intersect, union, difference, fetch random items HASH Unordered hash table of keys to values Add, fetch, or remove individual items, fetch the whole hash ZSET Ordered mapping of string members to floating-point scores, ordered by score Add, fetch, or remove individual values, fetch items based on score ranges or member value https://redis.io/commands/
- 17. Commands Commands are used to save or retrieve data in Redis
- 18. STRINGs commands
- 19. SET MESSAGE “Hello World” App Server Command Response ‘OK’ Redis MESSAGE ‘Hello World’
- 20. List
- 21. Create Retrieve Remove Operations List commands LPUSH RPUSH LSET LINDEX LRANGE LINSERT RPUSHX LPUSHX DEL LPOP RPOP LREM LMPOP LLEN LPOS LTRIM LMOVE
- 22. Set
- 23. Create Retrieve Remove Operations Set commands SADD SMEMBERS DEL SPOP SREM SCARD SDIFF SDIFFSTORE SINTER SINTERSTORE SISMEMBER SUNION SMOVE SUNIONSTORE SRANDMEMBER
- 24. Hash
- 25. Create Retrieve Remove Operations Hash commands HSET HMSET HSETNX HGET HGETALL DEL HDEL HLEN HINCRBY HSTRLEN HRANDFIELD HMGET HVALS HKEYS
- 26. ZSET
- 27. Create Retrieve Remove Operations Hash commands HSET HMSET HSETNX HGET HGETALL DEL HDEL HLEN HINCRBY HSTRLEN HRANDFIELD HMGET HVALS HKEYS
Editor's Notes
- #3: Redis is like any other database where you store information in strings image blog post, comments and bytes like image etc. After storing information, we can then retrieve it later on by writing queries. This behaviour is similar to any other databases. And how redis is different and why do we decide to use right us over any other database ?
- #4: Well, answer is very simple. Often engineers and myself use redis for one reason, it is very fast. Redis can store and retrieve data extremely quickly ?
- #6: Most databases store all their information between both the memory of a computer and a hard driver. Accessing data in memory is fast, but getting data that is stored on the hard disk is relatively slow.
- #7: Redis makes a simple decision here, rather than storing on hard disk, it keeps all the data in memory. And that means that accessing any data inside of a registered database is usually a very fast by default. However, because of this approach there are few limitation of this approach. It means that by default, it can be challenging to work with a dataset that is larger than the amount of memory that you computer has. For example, if your database has 100 giga bytes of data but you memory is somewhere around 16 giga bytes then this data will not for our database. This might sound like a tremendous problem, but do not worry about it. There are certain strategies that was available that are working of this limitations. .
- #8: Alright, lets move the second reason, the second reason is that Redis stores all of its data or organizes all of its data in simple data structures.
- #9: Like so on. These different data structures have very well known and very well understood performance characteristic. We can decide and organize our information in memory. Hence we have very good idea, how to efficiently query the data.
- #10: Finally. redis is very is fast because it is very simple in nature
- #11: Other databases like say MySQL and so on choose to layer on feature upon feature to make them easier to use. But all those additional features have big performance problems. Redis take a different approach Rather than stuffing in a ton of different features into the database, it is kept very simple on purpose.
- #12: So right away we are under sting here in this video that this is very fast. Because of 3 reasons, spell it We use redis because it is fast and it is fast because of these reason right here. So in order to use Redis, we have to understand how to fit our data or organize it using these simple data structures And we have to understand how to kind of work ourself around this limited features set. That really starts and gives you the picture what the redis is We need to understand how to work with data, how to organize it, and how to work with this simple set. So with that in mid, let’s go through a little bit of setup in the next video.
- #15: In this section, we are going to start to get some hands on experience with Redis.
- #16: In this section, we are going to start to get some hands on experience with Redis.