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Technical Articles

Database

Redis

What are the advantages of scan commands compared to keys *

The advantages of scan command over keys * are: incremental result acquisition to avoid memory problems; use cursor marks to pause and restore processing; support filtering results and narrowing the return range; performance optimization, avoiding full scan at one time; continuous scanning, and real-time update of database changes.

Apr 10, 2025 pm 03:30 PM

区别

How to view keys for a specific pattern

There are two ways to view keys for a specific pattern in Redis: iterate over the database using the SCAN command, returning the keys for matching patterns until the cursor is 0. Use the KEYS command to directly return the keys of all matching patterns.

Apr 10, 2025 pm 03:27 PM

redis

How to use the keys command to match the pattern

How to match patterns using the keys command? The keys command can search for keys for a specified pattern. The pattern supports wildcards: *: Match any character?: Match a single character [ and ]: Match characters in brackets\: Escape special characters The keys command also supports regular expression matching

Apr 10, 2025 pm 03:24 PM

How to use scan command to match mode

The scan command can search for patterns in files. Syntax: scan [Options] Mode [File...]. Options include: -l (print line numbers only), -n (print line numbers and matching lines), -q (not print output), and -e (interpretation mode is an extended regular expression). The pattern can be a basic string, a regular expression, or an awk program. Steps: Open the terminal window, enter the scan command and press Enter.

Apr 10, 2025 pm 03:21 PM

How to view the type of key in Redis

The key in Redis has a specific data type. You can use the TYPE command or the SELECT and DUMP commands to view the type of key. The TYPE command returns the type directly, while the SELECT and DUMP commands need to determine the type by comparing the first 8 bytes of the hexadecimal representation of the dumped value with the data type encoding table.

Apr 10, 2025 pm 03:18 PM

redis

How to view the expiration date of Redis key

You can use the Redis command TTL keyName to view the expiration time of the key in seconds. The command returns -1 to indicate that the key never expires; use PTTL keyName to view the expiration time in milliseconds.

Apr 10, 2025 pm 03:15 PM

redis

How to view the value of a key in Redis

How to view key values in Redis: Use the Redis command line tool: GET <key>Using Redis Desktop Manager: Find the key in the "Keys" tab and view the "Value" column Use Python client: r.get('key') Use Node.js client: client.get('key', (err, value) => {...})

Apr 10, 2025 pm 03:12 PM

python redis

How to view all keys on the Redis client

All keys can be viewed by filtering through Redis's KEYS command followed by an optional pattern. The steps are as follows: 1. Connect to the Redis server; 2. Execute the KEYS command: KEYS * or KEYS <pattern>; 3. View the returned list of keys matching the pattern.

Apr 10, 2025 pm 03:09 PM

redis

Redis command to view the number of keys

The DBSIZE command can be used to view the number of keys in a Redis database. The command syntax is: DBSIZE. The command returns the number of current keys, with a time complexity of O(1), which can be used to monitor the database size and growth rate.

Apr 10, 2025 pm 03:06 PM

redis

How to view memory usage of all keys in a database in Redis

Redis provides two commands to view the memory usage of all keys in the database: MEMORY USAGE allkeys: Returns the memory usage of all keys, in the format: "key" (type) # Memory used (bytes) INFO MEMORY keyspace: Provides a detailed memory usage list of all keys in each database.

Apr 10, 2025 pm 03:03 PM

redis 内存占用

How to use the COUNT parameter of the scan command

Use the COUNT parameter in the scan command to limit the number of results returned. The syntax is: scan <options> [COUNT <num>] <range>, where <num> is the number of rows or cells you want to return. This option is used to quickly retrieve a specific number of rows or cells, preventing unnecessary scan operations. The COUNT parameter can only be used with the WITHROWINDEXES option.

Apr 10, 2025 pm 03:00 PM

How to view all keys without blocking Redis

Question: How to view all keys without blocking Redis? Answer: Using the SCAN command, accept two parameters: cursor (cursor value) and COUNT (maximum number of keys).

Apr 10, 2025 pm 02:57 PM

redis

Linux redis restart command

The command to restart Redis in Linux is sudo service redis restart: sudo: run command with root privilege service: used to manage service redis: specify service name restart: restart service

Apr 10, 2025 pm 02:54 PM

linux redis

Will data be lost after redis restart

Normally, data is not lost after Redis restart because it provides two persistence mechanisms: RDB snapshot and AOF logs, ensuring that all data is restored at restart. However, data loss may occur when the persistence mechanism is disabled, snapshot or log file corrupted, or when Redis is not closed correctly. To prevent data loss, it is recommended to enable persistence, periodic backups, and turn Redis off correctly.

Apr 10, 2025 pm 02:51 PM

redis 数据丢失