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Redis configuration file redis.conf detailed description

received, Redis will first attempt to remove the key that set the expire information, regardless of the key's expiration time has not arrived.#在删除时, it will be deleted by the expiration time and the first key to be expired will be deleted first. If the key with expire information is erased, an error is returned.#这样, Redis will no longer receive write requests and receive only get requests. MaxMemory settings are more appropriate for using Redis as a memcached-like cache.# maxmemory # By default

"Hadoop" Data serialization system Avro

, including cutting Avro files for test data.Available Tools:compile generates Java code for the givenSchema. Concat concatenates Avro FileswithoutRe-compressing. Fragtojson renders a binary-encoded Avro datum asJson. Fromjson Reads JSON Records andWrites an AVRO datafile. Fromtext Imports Atext file intoAn Avro datafile. Getmeta Prints out theMetadata ofAn Avro datafile. GetSchema Prints out Schema ofAn Avro datafile. IDL generates a JSON schema fromAn Avro IDLfileInduce induce schema/protoco

Linux tcpdump command details how to use the Linux tcpdump command

The Execute tcpdump directive lists the header of the packet file that has been assigned to the network interface, and you must be a system administrator in the Linux operating system. Grammar tcpdump [-adeflnnopqstvx][-c [-r Parameter description: -a attempts to convert network and broadcast addresses to names. -C -D converts the compiled packet encoding into a readable format and dumps it to standard output. -DD convert

Dump file generation and analysis

/2010/03/08/5355841.aspxOf course my way is not the same as in the above two URL (learn above on the basis of doing), my detailed approach is:(1) Installation WinDbg(a) Download and install the WinDbg (installation method not to repeat)(b) Open WinDbg, File/attach to a process/and then display the processes (. exe) that need to be monitored in the list(c) When the program crashes, run the DUMP command to produce the DMP file, with the command:. dump/m c:/dum

Description of the parameters for the Redis configuration file redis.conf

, and so forth UntiL The database is completely emptied.## in short ... if you had slaves attached it is suggested so you set a lower# Limi T for MaxMemory So, there is some free RAM on the system for slave# output buffers (it is not needed if the Poli Cy is ' Noeviction '). #设置redis能够使用的最大内存. #达到最大内存设置后, Redis will first attempt to clear the expired or expiring key (key that sets the expire information) #在删除时, delete by expiration time, the first key to be expired will be deleted first # if exp

Java Interview Toolkit multi-Threading and concurrency

use and comes with a JDK. Since it is a terminal-based tool, we can write some scripts to generate thread dumps periodically for analysis. Read this document to learn more about generating thread dumps.1.23. What is a deadlock (Deadlock)? How do I analyze and avoid deadlocks?Deadlocks are situations in which more than two threads are permanently blocked, which results in a minimum of two threads and more t

Basic windbg-2. Analysis and diagnosis of high CPU

Guidance: Check the code first:             Code 1    Using system; 2    Using system. Threading; 3    4    Namespace highcpu 5                {6    Class program 7                {8    Static void main (string [] ARGs) 9                {10    Console. Clear (); 11    Console. writeline ("go to the command line, switch to the windbg directory, and run adplus-Hang-PN highcpu.exe-o C: // dumps"); 12    Console. writeline ("if you want to stop, press Ct

Basic knowledge about dump

What is a memory dump file? ====================================== There are many types of snapshot. Dump files of a process or system at a given time when a memory dump file is being dumped. Different types of dump files contain non-accurate data. User-mode memory dump file vs kernel-mode Memory Dump File ====================================== If you capture the dump file of a process, you capture the user-mode dump file. If you capture the dump file of the entire system memory, you will captu

Windbg usage Summary

1. How to capture dump files. There are two cases: First case: If yesVistaOrWindows2008The operating system is a simple task. In the task manager, switch to the "processes" tab, right-click the process you want to create the dump file, and select "create Dump File. If you want to create a dumpfile with w3wp.exe, you may see many w3wp files, but you do not know which one is the website you want to capture. You can run the following command to view them. For Vista or win2008 systems:% WINDIR %/

Detailed sudo usage

the execution of commands with the same name in other directories, resulting in security risks. Therefore, the absolute path is also used!Cmnd_alias dumps =/usr/bin/mt,/usr/sbin/dump,/usr/sbin/rdump ,\/Usr/sbin/restore,/usr/sbin/rrestoreCmnd_alias kill =/usr/bin/killCmnd_alias printing =/usr/sbin/LPC,/usr/bin/lprmCmnd_alias shutdown =/usr/sbin/ShutdownCmnd_alias halt =/usr/sbin/halt,/usr/sbin/fasthaltCmnd_alias reboot =/usr/sbin/reboot,/usr/sbin/fast

Mscorwks. dll cannot be loaded in windbg, Win32 error 0n2

Capture a mini dump and run it! Clrstack will prompt the following error: * ** Warning: unable to verify timestamp for mscorwks. dllFailed to load data access DLL, 0x80004005Verify that 1) You have a recent build of the debugger (6.2.14 or newer)2) The file mscordacwks. dll that matches your version of mscorwks. dll isIn the version directory3) or, if you are debugging a dump file, verify that fileMscordacwks _ 4) You are debugging on the same architecture as the dump file.For example, an IA64 d

** Warning ** mnesia is overloaded: {dump_log, write_threshold}

transaction 4 log dump hasn’t finished yet. Tweaking these parameters will make the 5 transaction log dump less often, and the disc_copies tables dump to disk 6 more often. NOTE: these parameters must be set before mnesia is started; 7 changing them at runtime has no effect. You can set them thru the 8 command line or in a config file. Dc_dump_limit 1 This variable controls how often disc

Introduction to Java Heap dump file analysis tool jhat, heapjhat

Introduction to Java Heap dump file analysis tool jhat, heapjhat Jhat is a Java heap Analyzes Tool ). after JDK6u7, it becomes standard. this command requires some Java development experience. The official website does not provide technical support and customer service for this tool.Usage: jhat [ options ] heap-dump-file Parameters: Options: optional command line parameters. See the following Options Heap-dump-file: the binary Java heap dump file to be viewed ). If a dump file contains multi

Write an address book code in python

;>>kalePleaseEnterYourAge>>>33PleaseEnterYourGender>>>fPleaseEnterYourTel>>>100111.adduserinfo2.dispalluserinfo3.updateuserinfobyusername4:deluserbyusername5:sortuserinfoby0.exitprogramPleaseselectone>>>2nameagegendertel----------------------------zhuima28f10086nick25m10010kale33f100111.adduserinfo2.dispalluserinfo3.updateuserinfobyusername4:deluserbyusername5:sortuserinfoby0.exitprogramPleaseselectone>>>0 3. complete code 4. File writing and reading Ideas: The cPickle concept is introduce

Sudoers file parsing and sudoers Parsing

categories: FULLTIMERS, PARTTIMERS, and WEBMASTERS.User_Alias FULLTIMERS = millert, mikef, dowdyUser_Alias PARTTIMERS = bostley, Hangzhou Fox, crawlUser_Alias WEBMASTERS = will, wendy, wim# Part 2: classify operation types.Runas_Alias OP = root, operatorRunas_Alias DB = oracle, sybase# Part 3: classify hosts. These are all randomly divided for better management.Host_Alias iSCSI = bigtime, eclipse, moet, anchor :\SGI = grolsch, dandelion, black :\ALPHA = widget, thalamus, foobar :\HPPA = boa, na

Explanation of the Redis configuration file

try to remove objects from free lists if possible. # # If all this fails, Redis will start to reply with errors to commands # That will use more memory, like SET, LPUSH, and so on, and will continue # To reply to most read-only commands like GET. # # WARNING: maxmemory can be a good idea mainly if you want to use Redis as # 'State' server or cache, not as a real DB. When Redis is used as a real # Database the memory usage will grow over the weeks, it will be obvious if # It is going to use too

Detailed steps and code for implementing restful interfaces for mysql using python

operation:Python manage. py syncdbVisit http: // 127.0.0.1: 8000/demo to see the following interface:The test code is as follows:Import jsonImport requestsFrom urlparse import urljoinBASE_URL = 'http: // 127.0.0.1: 16500 /'AUTH = ('admin', 'admin ')Def test_get_user_list ():Rsp = requests. get (urljoin (BASE_URL, '/demo/users/'), auth = AUTH, headers = {'Accept': 'application/json'})Assert rsp. OKDef test_post_user_list ():Json_data = dict (Passwo

Windbg DEBUG command 4 (user layer. Dump)

How to generate a dump file using windbg: when the program crashes (crash), you can use windbg to save all the data in the program's memory space for future debugging and analysis, the generated file is called a dump file. Step: 1) Open windbg and attach it to the crash program process. 2) input the command that generates the dump file. dump. You can select different parameters to generate different types of dump files. Option (1):/M command line example :. dump/m c: \

Java comes with command-line tools (Jmap,jhat,jinfo)

:\Java\jdk1.7.0_75\jre\bin\sunmscapi.dll0x0000000065960000 60kd:\java\jdk1.7.0_75\jre\bin\ Verify.dll0x000000006597000044kd:\java\ Jdk1.7.0_75\jre\bin\management.dll ...3.2-dump:[live,] format=b, File=filenameDumps the Java heap in hprof binary format. Specifies live, which identifies the object that dumps the active state. The resulting file can be viewed by the jhat command.C:\users\administrator>jmap-dump:format=b,file=9208_0413.hprof 9208Dumping H

Python learns the serialization and deserialization of the Day4 path file

format information to a file, and cannot write other types of informationwith open ("Test.text","R") as f_obj:data = F_obj.read ()data = eval (data)     Print (type (data))     print (data)    The program runs as follows:[11, 22, 33, 65, 33]In the above process, we have also implemented the process of serialization and deserialization using the Python's own eval () function, but since serialization and deserialization are implemented in the same program, there is no eval () in othe

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