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redis批量挖礦

發布時間: 2021-06-02 08:50:27

㈠ 有沒有好的方法遍歷redis裡面的所有key

在linux中批量操作redis中的keys的方法:1.統計個數:redis中名稱含有OMP_OFFLINE的key的個數;src/redis-clikeys"*OMP_OFFLINE*"|wc-l2.批量刪除批量刪除0號資料庫中名稱含有OMP_OFFLINE的key:src/redis-cli-n0keys"*OMP_OFFLINE*"|xargssrc/redis-cli-n0del在redis的客戶端環境中並不支持批量刪除。

㈡ 對於redis的批量刪除指定key,有沒有好的方法

1. 終端
獲取所有Key命令:redis-cli keys 『*』 ;
獲取指定前綴的key:redis-cli KEYS 「e:*」
如果需要導出,可以redis-cli keys 『*』 > /data/redis_key.txt
刪除指定前綴的Key redis-cli KEYS 「e:*」 | xargs redis-cli DEL

㈢ 如何批量刪除Redis下特定pattern的keys

在linux中 批量操作redis中的 keys的方法:
1.統計個數:

redis中名稱含有OMP_OFFLINE的key的個數;

src/redis-cli keys "*OMP_OFFLINE*"|wc -l

2.批量刪除
批量刪除 0號資料庫中名稱含有OMP_OFFLINE的key:
src/redis-cli -n 0 keys "*OMP_OFFLINE*"|xargs src/redis-cli -n 0 del

在redis的客戶端環境中並不支持批量刪除。

㈣ redis 怎麼批量獲取數據

Redis Mass Insertion
Sometimes Redis instances needs to be loaded with big amount of preexisting or user generated data in a short amount of time, so that millions of keys will be created as fast as possible.
This is called a mass insertion, and the goal of this document is to provide information about how to feed Redis with data as fast as possible.
Use the protocol, Luke
Using a normal Redis client to perform mass insertion is not a good idea for a few reasons: the naive approach of sending one command after the other is slow because you have to pay for the round trip time for every command. It is possible to use pipelining, but for mass insertion of many records you need to write new commands while you read replies at the same time to make sure you are inserting as fast as possible.
Only a small percentage of clients support non-blocking I/O, and not all the clients are able to parse the replies in an efficient way in order to maximize throughput. For all this reasons the preferred way to mass import data into Redis is to generate a text file containing the Redis protocol, in raw format, in order to call the commands needed to insert the required data.
For instance if I need to generate a large data set where there are billions of keys in the form: `keyN -> ValueN' I will create a file containing the following commands in the Redis protocol format:
SET Key0 Value0
SET Key1 Value1
...
SET KeyN ValueN

Once this file is created, the remaining action is to feed it to Redis as fast as possible. In the past the way to do this was to use the netcat with the following command:
(cat data.txt; sleep 10) | nc localhost 6379 > /dev/null

However this is not a very reliable way to perform mass import because netcat does not really know when all the data was transferred and can't check for errors. In the unstable branch of Redis at github the redis-cli utility supports a new mode called pipe mode that was designed in order to perform mass insertion. (This feature will be available in a few days in Redis 2.6-RC4 and in Redis 2.4.14).
Using the pipe mode the command to run looks like the following:
cat data.txt | redis-cli --pipe

That will proce an output similar to this:
All data transferred. Waiting for the last reply...
Last reply received from server.
errors: 0, replies: 1000000

The redis-cli utility will also make sure to only redirect errors received from the Redis instance to the standard output.

㈤ 使用python同步mysql到redis由於數據較多,一條一條讀出來寫到redis太慢,有沒有可以批量操作的。

importredis
importtime
redis=redis.Redis(host='localhost',port=6379,db=0)

s_time=time.time()
withredis.pipeline()aspipe:
pipe.multi()
forindex,iteminiteminenumerate(qset):#qset是你查詢出來的結果集,
key=item['id']
value=item['name']
ret=pipe.sadd(key,value)

ifindex%1000==0:
print"Nowcnt:%d"%(i+1)
pipe.execute()
pipe.multi()

print"Execute..."
pipe.execute()

e_time=time.time()

上面省略了mysql查詢代碼,而且是以鍵值對來描述的

㈥ Java如何獲取Redis中存儲的大量內容

第一,大量的數據是不會考慮放在JVM內存中;
第二,如果需要緩存大量的dto,動態數據(又稱過程數據)一般用的是redis;如果是靜態,系統啟動時就載入的大量配置,一般考慮放ehcache。
第三,由於redis用的是物理內存,不是JVM內存,一般情況下往redis里丟千萬級別的記錄數基本不影響性能,

㈦ 如何高效地向Redis寫入大量的數據

具體實現步驟如下:
1. 新建一個文本文件,包含redis命令
SET Key0 Value0
SET Key1 Value1
...
SET KeyN ValueN
如果有了原始數據,其實構造這個文件並不難,譬如shell,python都可以
2. 將這些命令轉化成Redis Protocol。
因為Redis管道功能支持的是Redis Protocol,而不是直接的Redis命令。
如何轉化,可參考後面的腳本。
3. 利用管道插入
cat data.txt | redis-cli --pipe
Shell VS Redis pipe
下面通過測試來具體看看Shell批量導入和Redis pipe之間的效率。
測試思路:分別通過shell腳本和Redis pipe向資料庫中插入10萬相同數據,查看各自所花費的時間。
Shell
腳本如下:
#!/bin/bash
for ((i=0;i<100000;i++))
do
echo -en "helloworld" | redis-cli -x set name$i >>redis.log
done
每次插入的值都是helloworld,但鍵不同,name0,name1...name99999。
Redis pipe
Redis pipe會稍微麻煩一點
1> 首先構造redis命令的文本文件
在這里,我選用了python
#!/usr/bin/python
for i in range(100000):
print 'set name'+str(i),'helloworld'
# python 1.py > redis_commands.txt
# head -2 redis_commands.txt
set name0 helloworld
set name1 helloworld
2> 將這些命令轉化成Redis Protocol
在這里,我利用了github上一個shell腳本,
#!/bin/bash
while read CMD; do
# each command begins with *{number arguments in command}\r\n
XS=($CMD); printf "*${#XS[@]}\r\n"
# for each argument, we append ${length}\r\n{argument}\r\n
for X in $CMD; do printf "\$${#X}\r\n$X\r\n"; done
done < redis_commands.txt
# sh 20.sh > redis_data.txt
# head -7 redis_data.txt
*3
$3
set
$5
name0
$10
helloworld
至此,數據構造完畢。
測試結果

㈧ 怎麼向redis導入大量數據

具體實現步驟如下:1.新建一個文本文件,包含redis命令如果有了原始數據,其實構造這個文件並不難,譬如shell,python都可以2.將這些命令轉化成RedisProtocol。因為Redis管道功能支持的是RedisProtocol,而不是直接的Redis命令。如何轉化,可參考後面的腳本。3.利用管道插入catdata.txt|redis-cli--pipeShellVSRedispipe下面通過測試來具體看看Shell批量導入和Redispipe之間的效率。測試思路:分別通過shell腳本和Redispipe向資料庫中插入10萬相同數據,查看各自所花費的時間。Shell腳本如下:#!/bin/bashfor((i=0;i>redis.logdone每次插入的值都是helloworld,但鍵不同,name0,name1name99999。RedispipeRedispipe會稍微麻煩一點1>首先構造redis命令的文本文件在這里,我選用了python#!/usr/bin/pythonforiinrange(100000):print'setname'+str(i),'helloworld'#python1.py>redis_commands.txt#head-2redis_commands.>將這些命令轉化成RedisProtocol在這里,我利用了github上一個shell腳本,#!/bin/bashwhilereadCMD;do#eachcommandbeginswith*{numberargumentsincommand}\r\nXS=($CMD);printf"*${#XS[@]}\r\n"#foreachargument,weappend${length}\r\n{argument}\r\nforXin$CMD;doprintf"\$${#X}\r\n$X\r\n";donedoneredis_data.txt#head-7redis_data.txt*3$3set$5name0$10helloworld至此,數據構造完畢。測試結果

㈨ 如何獲取redis內的所有內容

1、到遠程的倉庫進行搜索。

㈩ windows下怎麼批量刪除redis key

在linux中 批量操作redis中的 keys的方法:1.統計個數:

redis中名稱含有OMP_OFFLINE的key的個數;

src/redis-cli keys "*OMP_OFFLINE*"|wc -l

2.批量刪除
批量刪除 0號資料庫中名稱含有OMP_OFFLINE的key:
src/redis-cli -n 0 keys "*OMP_OFFLINE*"|xargs src/redis-cli -n 0 del

在redis的客戶端環境中並不支持批量刪除。

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