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of the cluster in the case of a non-statutory number of votes CRM (live) #primitivemydrbdocf:linbit:drbdparamsdrbd_resource =mydataopmonitorrole=masterinterval=10stimeout=20sopmonitor role=slaveinterval=20stimeout=30sopstarttimeout=240sopstop timeout=100s #定义drbd设备的主资源crm (Live) #masterms_mydrbdmydrbdmeta master-max=1master-node-max=1clone-max=2clone-node-max=1notify=true# A clone resource that defines the DRBD master resource, which has a role, can

Tags: _for avoid function matching sim user tuple most ReplicatWrite in front: indexes have a critical impact on the speed of queries, and understanding indexes is also a starting point for database Performance tuning. Consider the following scenario, assuming that a table in the database has 10^6 records, the DBMS has a page size of 4K, and stores 100 records. If there is no index, the query will scan the entire table, in the worst case, if all the data pages are not in memory, need to read 10^

ObjectiveIndexes have a critical impact on the speed of queries, and understanding indexes is also a starting point for database Performance tuning. Consider the following scenario, assuming that a table in the database has 10^6 records, the DBMS has a page size of 4K, and stores 100 records. If there is no index, the query will scan the entire table, in the worst case, if all the data pages are not in memory, need to read 10^4 pages, if the 10^4 pages on the disk randomly distributed, need to 1

Label:Write in front: indexes have a critical impact on the speed of queries, and understanding indexes is also a starting point for database Performance tuning. Consider the following scenario, assuming that a table in the database has 10^6 records, the DBMS has a page size of 4K, and stores 100 records. If there is no index, the query will scan the entire table, in the worst case, if all the data pages are not in memory, need to read 10^4 pages, if the 10^4 pages on the disk randomly distribut

Write in front: indexes have a critical impact on the speed of queries, and understanding indexes is also a starting point for database Performance tuning. Consider the following scenario, assuming that a table in the database has 10^6 records, the DBMS has a page size of 4K, and stores 100 records. If there is no index, the query will scan the entire table, in the worst case, if all the data pages are not in memory, need to read 10^4 pages, if the 10^4 pages on the disk randomly distributed, ne

-row data is ACID, multi-line transactions, does not support normal rollback of transactions, supports I (isolation) Isolation (transactional serial commit), D (durability) persistence, does not guarantee A (atomicity) atomicity, C (consistency) consistency. Usage ScenariosTake HBase as an example to illustrate: Large data volumes (100s terabytes of data), with the need for fast, random access. write-intensive applications , with a l

'--password= ' 5bbcz4wlurwvbfbx '--nocontinue--dela y=2m--interval=20s--port 3306 192.168.1.217 --continue: Continue replication, normal exit (default is YES) if the restart thread does not have until condition after exiting, he will run after master--nocontinue: means not catching up####################################################################################### # # Recovery on a delayed backup server after mistakenly deleting data on the master server # ################################

Question: Give some numbers, ask how many different values are in an interval, and how many different values are in an interval.Idea: Because there is no modification, so I think of the MO team algorithm. Then I wrote the 5k+ Manhattan distance to the smallest spanning tree and then decisively T. (100s time limit ah, brush the status of the brush is crazy.), the result of the last added handwriting read-in also failed a). Later decisively give up, wro

command and the closing curly brace} are written on the same line, the end of the command must have; A shell function that does not have a parameter list does not mean that arguments cannot be passed, in fact , a function is like a mini script that can be passed when calling a functionAny parameter (requires a function keyword in front of it)6. How to debug shell scriptsThe shell provides some options for debugging scripts, as follows:-N: Read the command in the script but not execute it to che

when there was nothing more than add, but when there was nothing left to take away.2.IntroductionPowerful means following the paradigm of "Minimal effort. Maximal effect. "Press * RUN:SP run:50 Run:, 100s/old/new/g Press GFRun:colorscheme Desert Run:nmap Run:mksession ~/latest_session.vim, Vim-s ~/latest_session.vimRun:syntax on: Set Filetype=wikipediaRun:set foldmethod=indent Run:tabedit Press Ctrl-n RUN:0,10S/FORM/TO/GC Run:%s/from/to/gRun:help vim

Filtering text using Grep's PowerShellThere is a log file, about 4M in size, asking to find a record that takes more than 100s. First think of the powerful grep, then get up.First find information on the Internet, this article, there are several ways: The first type:Get-content somefile.txt|findstr "Someregexp"Get-content can be replaced by Cat,powershell already gave them an alias, but really considerate sheller.This approach is a mix of com

PHP//use Pcntl_fork () to generate child processes when the program needs to fork, and then perform the tasks simultaneously in multiple threads $pid=pcntl_fork (); if($pdi) Exit(' Fork error! '); if($pid) { //if the PID is greater than 0, then it is the parent process,//This side let the parent process directly return data to the client, to achieve the effect of the fact #dothing}Else { //child processes, allowing the child process to perform complex business log

Why do I use Netem to do a flow controlBut when sending, feel really send the data when still did not reach every packet is a 1s delay ah, here the 1s delay is what mean ah?The delay here is not to say that each packet is delay 5s, but that after delay5s, all of a sudden sent out?sudo tc qdisc add dev eth0 root netem delay 100sAll eth0 packets have to be delayed by 100s, starting with the queue, and we start timing, because all of the packets are in t

not tidy, will cache a lot of items, and collation of time too often, and will cause pressure on the system, this value is to determine the minimum collation cycle interval) Inet_peer_gc_maxtime:integerThe default value is 120The maximum interval through which the waste collection (GC) passes, which affects the low pressure of memory in the buffer pool. This value is measured in jiffies units. Jiffie: The internal time unit used by the kernel, the size of 1/

previous working directory: Copy Code code as follows: CD- Split a large volume of tar.gz files (each 100MB), and then merge back: Copy Code code as follows: Split–b 100m/path/to/large/archive/path/to/output/files Cat files* > Archive Use Curl to get HTTP status code: Copy Code code as follows: Curl-sl-w "%{http_code}\\n" Www.example.com-o/dev/null Set root password to enhance MySQL security installation: Copy Cod

Datagrid DataGridView is easy to use, but if the amount of data is larger then there will be a performance problem. The general approach provided online is to accelerate through virtual mode. But sometimes, you can speed up DataGridView with simple settings. (1) Use bound data. is to interact with Datagridview.datasource by loading the DataTable and then through BindingSource. (2) Do not use Autosizecolumnsmode.allcells. If so, DataGridView will not be displayed until all the cells have been d

Code Download Address Https://fuchsia.googlesource.com/magenta Using GitHub's image Https://github.com/fuchsia-mirror/magenta Brief introduction Https://github.com/fuchsia-mirror/magenta/blob/master/docs/index.md Magenta is the core platform that powers the Fuchsia OS. Magenta iscomposed of a microkernel as well as a small set of userspace services,drivers, and libraries necessary for the System to boot, talk to hardware,load userspace processes and run them, etc. Fuchsia builds a much lar

Tried a bit of quartz, the function is very powerful, unfortunately has already had this aspect the design, wants to replace, the workload is too big. For a problem that has often been encountered before: the processing mechanism of timeouts (timeout), as if there are no related countermeasures in quartz, so try to write a: Import Org.apache.log4j.Logger;Import Org.quartz.InterruptableJob;Import Org.quartz.JobExecutionContext;Import org.quartz.UnableToInterruptJobException; /**** @author Zhouc

Tried a bit of quartz, the function is very powerful, unfortunately before already has this aspect design, want to replace words, the workload is too big. For a problem often encountered before: timeout (TimeOut) processing mechanism, as if there is no relevant treatment quartz inside countermeasures, so try to write a: Import Org.apache.log4j.Logger;Import Org.quartz.InterruptableJob;Import Org.quartz.JobExecutionContext;Import org.quartz.UnableToInterruptJobException; /**** @author Zhoucan*/

directly when the primary node is started)--mysqlip--and MySQLServerCRM (Live) configure# order Mysqlip_after_mount Mandatory:mysqlip MountCRM (Live) configure# order Mysqlserver_after_mysqlip Mandatory:mysqlip MySQLServer################## #查看所有定义资源的信息 ####################CRM (live) # ConfigureCRM (live) configure# ShowNode 1:node1Node 2:node2Primitive Mount Filesystem \params device= "/dev/drbd0" directory= "/mydata" FSTYPE=EXT4 \Op start timeout=60s interval=0 \Op Stop timeout=60s interval=0