Linux installation Redis and Redis Basic operations commands

01Redis Introduction

REmote DIctionary Server (Redis) is a Key-value storage system written by Salvatore Sanfilippo.

Redis is an open source API that is written in ANSI C, adheres to the BSD protocol, supports networks, can be persisted in memory, key-value databases, and provides multiple languages.

It is commonly referred to as a data structure server, because the value can be a string (string), a hash (MAP), a list, a collection (sets), and an ordered collection (sorted sets).

Installation of 02Redis

2. Put the Redis tar (source bundle) package in a folder

4. Unzip the tar package, using the following command

   TAR-ZXVF redis-4.0.6.tar.gz

   3. Install and build Redis using the following command

   CD redis-2.6.14

   Make Prefix=/usr/local/redis Install

   You may encounter the following error during execution:

   >> Tip 1:

   MAKE[3]: gcc: Command not found

   >> Solutions

   Yum-y Install gcc-c++

   >> Tip 2:

   In a file that contains self-adlist.c:34:

   ZMALLOC.H:50:31: Error: jemalloc/jemalloc.h: no file or directory

   Zmalloc.h:55:2: Error: #error "Newer version of Jemalloc required"

   >> Solutions

   Add the MALLOC=LIBC parameter when make

   Make Prefix=/usr/local/redis malloc=libc Install

6. Copy the configuration file to the Redis directory

   Redis directory:

   redis.conf configuration file Common configuration

   (1) Bind if only native connection is enabled, if comment off any can be connected.

   (2) Turn redis process into a background process without consuming my client

8. Set Up password Authentication

   03 Starting the Redis service

   Background Process Start Successful interface

10. Start Redis Service

11. Sign in to Redis
    04Redis Basic command Redis's keys command

    Keys * Query All

    Keys Home Exact Search

    Keys h* Fuzzy Lookup

    DEL Key

    This command is used to remove key when a key is present.

    DUMP Key

    Serializes the given key and returns the serialized value.

    EXISTS Key

    Checks if a given key exists.

    EXPIRE Key seconds

    Sets the expiration time for a given key.

    Expireat key Timestamp

    The Expireat function is similar to EXPIRE and is used to set the expiration time for the key. The difference is that the time parameter accepted by the Expireat command is a UNIX timestamp (Unix timestamp).

    Pexpire key milliseconds

    Sets the expiration time of the key in milliseconds.

    Pexpireat Key Milliseconds-timestamp

    Set the timestamp for key expiration Time (Unix timestamp) in milliseconds

    KEYS pattern

    Finds all keys that match the given pattern (pattern).

    MOVE Key db

    Moves the key of the current database into the given DB.

    PERSIST Key

    When the key expires, key will persist.

    Pttl Key

    Returns the remaining expiration time of key in milliseconds.

    TTL Key

    Returns the remaining lifetime (TTL, Time to live) for a given key, in seconds.

    Randomkey

    Returns a key randomly from the current database.

    RENAME Key Newkey

    Change the name of the key

    Renamenx Key Newkey

    Rename the key to Newkey only if the Newkey does not exist.

    TYPE Key

    Returns the type of value stored by key.

    Redis string command

    1	set key value Sets the value of the specified key
    2	get key Gets the value of the specified key.
    3	getrange key start end Returns the substring of the string value in key
    4	getset key value Sets the value of the given key to value and returns the old value of the key
    5	getbit key offset Gets the bitwise (BIT) on the specified offset for the string value stored by key.
    6	Gets the value of all (one or more) given key.
    7	setbit key offset value Sets or clears a bit (bit) on the specified offset for the string value stored by key.
    8	setex key seconds value Associates the value of values to key and sets the expiration time of key to seconds (in seconds).
    9	setnx key value Sets the value of key only if the key does not exist.
    10	setrange key offset value is used to overwrite the string value stored by the key with the value parameter, starting with offsets offset.
    11	strlen key returns the length of the string value stored by key.
    12	mset key value [key value ...] Set one or more key-value pairs at the same time.
    13	msetnx key value [key value ...] Sets one or more key-value pairs at the same time, if and only if all of the given keys do not exist.
    14	psetex key milliseconds value This command is similar to the Setex command, but it sets the lifetime of the key in milliseconds, rather than in seconds, as in the Setex command.
    15	incr key increases the number of values stored in key by one.
    16	incrby key increment Adds the value stored by key to the given increment value (increment).
    17	incrbyfloat key increment adds the value stored by key to the given floating-point increment value (increment).
    18	decr key Minus one of the numeric values stored in key.
    19	decrby key decrement Key stores the value minus the given decrement value (decrement).
    20	APPEND Key value If the key already exists and is a string, the APPEND command appends value to the end of the original value of the key.

Linux installation Redis and Redis Basic operations commands