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How to view the type of key in Redis

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

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 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

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

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

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

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

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

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

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
Will redis restart clear data

Will redis restart clear data

Redis restart does not clear the data because Redis stores the data in memory and loads the data from persistent storage such as RDB or AOF. There are two types of persistent storage: RDB and AOF, which ensure that data is not lost after restarting. In addition, Redis has other protections such as snapshot options, replication and sentinels to prevent data loss. However, in rare cases, such as persistent storage corruption or accidental termination, it can lead to data loss.

Apr 10, 2025 pm 02:48 PM
redis 数据丢失 持久化存储
Is the redis restart data still there

Is the redis restart data still there

The data still exists after Redis restart. Redis stores data in memory, and restarting does not delete memory data. Redis also provides persistence, saving data to the hard disk via RDB or AOF files, ensuring that data can be recovered from persistent files after restart.

Apr 10, 2025 pm 02:45 PM
redis
Redis restarts using the specified configuration file

Redis restarts using the specified configuration file

Restart Redis by specifying the configuration file: 1. Find the configuration file (redis.conf usually located in the conf subdirectory); 2. Modify the required configuration (such as changing the port); 3. Use the redis-server /path/to/redis.conf command to restart Redis through the configuration file (where /path/to/redis.conf is the path of the modified configuration file); 4. Use redis-cli to verify that the restart has been successfully.

Apr 10, 2025 pm 02:42 PM
redis
What is Redis restart command

What is Redis restart command

The Redis restart command is redis-server. This command is used to load configuration files, create data structures, start Redis servers, and listen for client connections. Users can execute the "redis-server [Options]" command in the terminal to restart the Redis server. Common options include background operation, specifying configuration file path, specifying listening port, and reloading snapshots only when data is lost. Note that restarting the server will disconnect all client connections, be sure to save the necessary data before restarting.

Apr 10, 2025 pm 02:39 PM
redis 数据丢失

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