本篇文章给大家谈谈updates是什么意思啊,以及GDR是什么意思对应的知识点,文章可能有点长,但是希望大家可以阅读完,增长自己的知识,最重要的是希望对各位有所帮助,可以解决了您的问题,不要忘了收藏本站喔。
本文目录
GDR是什么意思
GDR是全球存托凭证。GDR在超过一个国家发行,代表一家国外公司的银行证书。这些股票由国际银行的国外分行持有,与国内股票一同交易,通过不同银行分行作全球销售。GDR是非公开市场用以筹集美元或欧元资金的金融工具。
last October前面用什么介词
任何介词都不加。
lastOctober含义为去年十月。其中,last做形容词,含义为上一个、去年的,修饰并限定October十月。二者组合在一起构成副词短语,通常在句子中充当状语,即时间状语。
若去掉last只剩October,则October前只能使用介词in。
此外,last词性多样,可以作形容词,副词,名词或动词,是常见并常用的多义词。
电脑硬件自动安装时显示的“Display”是什么意思
显卡绝对未安装好驱动,建议重新完全的安装一次,如果还没成功,那么就马上拔出来显卡,再插进去让系统发现新硬件,再插光盘完全安装驱动即可。如果以上都不可用,那么要好好的检查您的显卡了,是不是坏掉了,试试吧或者这样看桌面属性,设置->高级->疑难问答->硬件加速->完全。运行dxdiag.exe,打开Display选项卡,可看到3项全部启用了。最后,利用Windowsupdates在WindowsServer2003中安装DirectX9.0a。
mgr是什么意思
MySQLGroupReplication(下简称MGR)准确来说是官方推出的高知可用解决方案,基于原生复制技术,并以插件的方式提供。
1、使用前,关掉防火墙,包括selinux,firewalld,或者MySQL企业版的firewall(如果用了企业版的话)2、两台机器:(4台MySQL实例)192.168.2.219centos-ytt57-13311/3312192.168.2.229centos-ytt57-23311/33123、安装MySQL(两台都装),MySQLShell(任意一台),mysqlrouter(任意一台,官方建议和应用程序装在一个服务器上)yuminstallmysql-community-servermysql-shellmysql-router-community
4、搭建InnoDB-Cluster(两台都装)
1.配置文件如下:shell>vi/etc/my.cnfmaster-info-repository=tablerelay-log-info-repository=tablegtid_mode=ONenforce_gtid_consistency=ONbinlog_checksum=NONElog_slave_updates=ONbinlog_format=ROWtransaction_write_set_extraction=XXHASH642.系统HOSTS配置(两台都配)
shell>vi/etc/hosts
127.0.0.1localhostlocalhost.localdomainlocalhost4localhost4.localdomain4
::1localhostlocalhost.localdomainlocalhost6localhost6.localdomain6
192.168.2.219centos-ytt57-2
192.168.2.229centos-ytt57-3
用MySQLcoalesce函数确认下report-host是否设置正确(root@localhost):[(none)]>SELECTcoalesce(@@report_host,@@hostname)asr;+----------------+|r|+----------------+|centos-ytt57-1|+----------------+1rowinset(0.00sec)
3.创建管理员用户搭建GROUPREPLICATION(四个节点都要)
createuserrootidentifiedby'Root@123';grantallon*.*torootwithgrantoption;flushprivileges;
4.MySQLsh连接其中一台节点:
[root@centos-ytt57-1mysql]#mysqlshroot@localhost:3321
5.检查配置正确性:(如果这里不显示OK,把对应的参数加到配置文件重启MySQL再次检查)dba.checkInstanceConfiguration("root@centos-ytt57-2:3311");dba.checkInstanceConfiguration("root@centos-ytt57-2:3312");dba.checkInstanceConfiguration("root@centos-ytt57-3:3311");dba.checkInstanceConfiguration("root@centos-ytt57-3:3312");mysqlsh执行检测
[root@centos-ytt57-1mysql]#mysqlsh--log-level=8root@localhost:3311
MySQLlocalhost:3311sslJS>dba.checkInstanceConfiguration("root@centos-ytt57-2:3311")
{
"status":"ok"
}
6.创建集群,节点1上创建。(结果显示Clustersuccessfullycreated表示成功)
MySQLlocalhost:3311sslJS>varcluster=dba.createCluster('ytt_mgr');
Clustersuccessfullycreated.UseCluster.addInstance()toaddMySQLinstances.
Atleast3instancesareneededfortheclustertobeabletowithstandupto
oneserverfailure.
7.添加节点2,3,4(全部显示OK,表示添加成功)MySQLlocalhost:3311sslJS>cluster.addInstance('root@centos-ytt57-2:3312');MySQLlocalhost:3311sslJS>cluster.addInstance('root@centos-ytt57-3:3311');MySQLlocalhost:3311sslJS>cluster.addInstance('root@centos-ytt57-3:3312');
8.查看拓扑图:(describe简单信息,status详细描述)
MySQLlocalhost:3311sslJS>cluster.describe()
{
"clusterName":"ytt_mgr",
"defaultReplicaSet":{
"name":"default",
"topology":[
{
"address":"centos-ytt57-2:3311",
"label":"centos-ytt57-2:3311",
"role":"HA",
"version":"8.0.17"
},
{
"address":"centos-ytt57-2:3312",
"label":"centos-ytt57-2:3312",
"role":"HA",
"version":"8.0.17"
},
{
"address":"centos-ytt57-3:3311",
"label":"centos-ytt57-3:3311",
"role":"HA",
"version":"8.0.17"
},
{
"address":"centos-ytt57-3:3312",
"label":"centos-ytt57-3:3312",
"role":"HA",
"version":"8.0.17"
}
],
"topologyMode":"Single-Primary"
}
}
MySQLlocalhost:3311sslJS>cluster.status()
"clusterName":"ytt_mgr",
"defaultReplicaSet":{
"name":"default",
"primary":"centos-ytt57-2:3311",
"ssl":"REQUIRED",
"status":"OK",
"statusText":"ClusterisONLINEandcantolerateuptoONEfailure.",
"topology":{
"centos-ytt57-2:3311":{
"address":"centos-ytt57-2:3311",
"mode":"R/W",
"readReplicas":{},
"role":"HA",
"status":"ONLINE",
"version":"8.0.17"
},
"centos-ytt57-2:3312":{
"address":"centos-ytt57-2:3312",
"mode":"R/O",
"readReplicas":{},
"role":"HA",
"status":"ONLINE",
"version":"8.0.17"
},
"centos-ytt57-3:3311":{
"address":"centos-ytt57-3:3311",
"mode":"R/O",
"readReplicas":{},
"role":"HA",
"status":"ONLINE",
"version":"8.0.17"
},
"centos-ytt57-3:3312":{
"address":"centos-ytt57-3:3312",
"mode":"R/O",
"readReplicas":{},
"role":"HA",
"status":"ONLINE",
"version":"8.0.17"
}
},
"topologyMode":"Single-Primary"
},
"groupInformationSourceMember":"centos-ytt57-2:3311"
9.简单测试下数据是否同步
(root@localhost):[(none)]>createdatabaseytt;
QueryOK,1rowaffected(0.03sec)
(root@localhost):[(none)]>useytt;
Databasechanged
(root@localhost):[ytt]>createtablep1(idintprimarykey,log_timedatetime);
QueryOK,0rowsaffected(0.08sec)
(root@localhost):[ytt]>insertintop1values(1,now());
QueryOK,1rowaffected(0.04sec)
(root@localhost):[ytt]>showmasterstatus;
+---------------+----------+--------------+------------------+-------------------------------------------+
|File|Position|Binlog_Do_DB|Binlog_Ignore_DB|Executed_Gtid_Set|
+---------------+----------+--------------+------------------+-------------------------------------------+
|mysql0.000001|25496|||6c7bb9db-b759-11e9-a9c0-0800276cf0fc:1-41|
+---------------+----------+--------------+------------------+-------------------------------------------+
1rowinset(0.00sec)
查看其他三个节点
(root@localhost):[ytt]>showtables;
+---------------+
|Tables_in_ytt|
+---------------+
|p1|
+---------------+
1rowinset(0.00sec)
(root@localhost):[ytt]>select*fromp1;
+----+---------------------+
|id|log_time|
+----+---------------------+
|1|2019-08-0516:44:20|
+----+---------------------+
1rowinset(0.00sec)
停掉主节点:[root@centos-ytt57-2mysql0]#systemctlstopmysqld@0
现在查看,主节点已经变为本机3312节点"centos-ytt57-2:3312":{"address":"centos-ytt57-2:3312","mode":"R/W","readReplicas":{},"role":"HA","status":"ONLINE"}
10.报错处理
错误日志里显示2019-08-05T09:01:35.125591Z0[ERROR]Plugingroup_replicationreported:'Thegroupnameoptionismandatory'2019-08-05T09:01:35.125622Z0[ERROR]Plugingroup_replicationreported:'UnabletostartGroupReplicationonboot'
同时用cluster.rescan()扫描,发现Theinstance'centos-ytt57-2:3311'isnolongerpartoftheReplicaSet.
重新加入此节点到集群:cluster.rejoinInstance('centos-ytt57-2:3311')
再次执行cluster.status()查看集群状态:"status":"OK",11.移除和加入cluster.removeInstance("centos-ytt57-3:3312");Theinstance'centos-ytt57-3:3312'wassuccessfullyremovedfromthecluster.cluster.addInstance("centos-ytt57-3:3312");Theinstance'centos-ytt57-3:3312'wassuccessfullyaddedtothecluster.
12.用mysqlrouter生成连接MGR相关信息。涉及到两个用户:--user=mysqlrouter是使用mysqlrouter的系统用户自动创建的MySQL用户是用来与MGR通信的用户。如果想查看这个用户的用户名以及密码,就加上--force-password-validation,不过一般也没有必要查看。
updates是什么意思啊和GDR是什么意思的问题分享结束啦,以上的文章解决了您的问题吗?欢迎您下次再来哦!