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computers or different encodings, the data is at risk of conflict. --From Https://zh.wikipedia.org/wiki/Unicode#%E5%AE%9E%E7%8E%B0%E6%96%B9%E5%BC%8F UTFUTF (Unicode Transformation format) means the Unicode conversion formats. For example, if a Unicode file contains only basic 7-bit ASCII characters, if each character is transmitted using a 2-byte original Unicode encoding, the 8 bits of its first byte are always 0. This creates a relati

Server environment:650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/26/8E/wKioL1NrXYri1iztAAEdbd2C-Vc420.jpg "title=" 17.jpg "alt=" Wkiol1nrxyri1iztaaedbd2c-vc420.jpg "/>InstallationVim/etc/apt/sources.list.d/mariadb.list # Add the following two lines of Deb Http://mirror.yongbok.net/mariadb/repo/5.5/ubuntu precise Maindeb-src http://mirror.yongbok.net/mariadb/repo/5.5/ubuntu precise Mainapt-key adv--recv-keys--keyserver keyserver.ubuntu

---------------------------------------------------------------------------------------------- ------------------------------------------------selectcount (*) fromt1where object_idbetween999and10005gu397922cuqd11selEctcount (*) fromt1whereobject_idbetween999and60000 B8xxw70vja3tn11As you can see from the query results, Oracle uses hard parsing when executing the above SQL. Oracle generates a parent cursor and a child cursor for each of the two SQL respectively.Then view the execution plan:650) t

"). (a). to (a) should (Filterbuilders.termfilter ("City", "Beijing")); You can now use the following methods: Boolquerybuilder Boolquerybuilder = Querybuilders.boolquery (); Boolquerybuilder.must (Querybuilders.termquery ("name", "John")); Boolquerybuilder.must (Querybuilders.rangequery ("age"). from (a). to (); Boolquerybuilder.must (Querybuilders.termquery ("City", "Beijing"); Constantscorequerybuilder QueryBuilder = Querybuilders.constantscorequery (Boolquerybuilder); 2. Deep underst

version, PID, name and other information, elasticsearch default will give the Node a random name (here is Answer): 1 [2016-05-03 17:24:15,032] [INFO] [Node] [Answer] Version [1.7.1], PID [21122], build [b88f43f/2015-07-29t09:54:16z] To load plug-in information: 1 [2016-05-03 17:24:15,233] [INFO] [Plugins] [Answer] Loaded [Analysis-ik, Marvel], sites [Marvel] The port for internal node communication is 9300: 1 [2016-05-03 17:24:

Local_syslog.conf Input { Syslog { port = ' 514 ' } } output { Elasticsearch { hosts = = ["node1:9200"] Start Logstash Error: [elastic@node1 logstash-6.2.3]$ bin/logstash -f config/local_syslog.conf Sending Logstash's logs to /var/log/logstash which is now configured via log4j2.properties [2018-04-26T10:30:23,901][INFO ][logstash.modules.scaffold] Initializing module {:module_name=>"netflow", :directory=>"/opt/logsta

Elasticsearch provides developers with a set of restful interfaces based on the HTTP protocol, and only needs to construct a rest request and parse the JSON returned by the request for access to the Elasticsearch server. Elasticsearch API interface is rich in functionality, including clustering, monitoring, deployment management, etc., also contains commonly used documents, index operations, this article is mainly using the Postman tool for document operations related to the API to do the learni

1. Cluster name, default is Elasticsearch: Cluster.name:elasticsearch 2. Node name, the node name is created automatically when ES starts, but you can also configure: Node.name: "Franz Kafka" 3. Whether as the primary node, each node can be configured as the primary node, and the default value is true: Node.master:true 4. Whether the data is stored, that is, the index fragment is stored, the default value is true: Node.data:true The simultaneous configuration of master and data produces so

I. PHP installation REDIS extensions1. use Phpinfo () To view information about the current version650) this.width=650; "Src=" https://s3.51cto.com/wyfs02/M02/8E/A2/wKioL1jHj_WzMuGgAACO8A6CnZw665.png-wh_500x0-wm_ 3-wmp_4-s_1076137895.png "title=" qq picture 20170314143600.png "alt=" Wkiol1jhj_wzmuggaaco8a6cnzw665.png-wh_50 "/>2. According to the PHP version number, the compiler version number and CPU architectureChoose Php_redis-2.2.5-5.6-nts-vc11-x64

Experimental case: User and file Rights management Lab Environment: The company's Linux host will be provided to the technical Department as a development server to use, according to the composition of the project team within the Department, the need to set up the corresponding group accounts, user accounts, and set permissions for the relevant directory; You also need to set up a common data storage directory for data exchange between colleagues Requirements: Create a user directory Add a group

Huawei ENSP is not very stable at the moment, Xiaoge will now be in the use of ENSP process encountered problems summarized as follows:Precautions for using ENSP:① recommend installing ENSP, the installation directory does not appear in Chinese.② shuts down antivirus software (especially PC Butler) and firewalls.③ the user name of the administrator does not appear in Chinese.④ opens the CPU virtualization function (VT, virtual) in the BIOS, otherwise it will run very well.650) this.width=650; "s

The previous article describes two commands for two comparison bases:PwdCdIn fact, CD This command, there is a more common usage, that is: CD-This is the most recent use of the directory, like a TV remote control on a function, switch to the previous program, that is, two programs to switch back and forth. Here is the current directory and the last directory to switch back and forth, it is more commonly used! Look directly at the effect!650) this.width=650; "Src=" https://s5.51cto.com/wyfs02/M01

5221): +10000m # #指定第一个分区大小为10G Command (M for help): N #继续新建分区 Command Action E Extended P primary partition (1-4) P # #依旧是主分区 Partition number (1-4): 2 # #编号为2 The cylinder (1218-5221, default 1218): Using default value 1218 # #起始点直接回车表示默认 Last cylinder or +size or +sizem or +sizek (1218-5221, default 5221): +20000m # # #指定大小为20G Command (M for help): N # #新建分区 Command Action E Extended P primary partition (1-4) P # #选择主分区 Partition number (1-4): 3 # #主分区编号为3 The cylinder (365

. now, with a set on the line Oracle Database production environment to demonstrate operations. first, look at the most recent RMAN fully prepared, as shown,650) this.width=650; "Src=" https://s5.51cto.com/wyfs02/M02/8E/47/wKiom1i7uI-Rkd13AABdXEDiUOI748.png-wh_500x0-wm_ 3-wmp_4-s_649140724.png "title=" 1.png "alt=" Wkiom1i7ui-rkd13aabdxediuoi748.png-wh_50 "/>Next, take a look at the generated checksum The LOG file for the validity of the RMAN backup

Brief introduction:Elk consists of three open source tools, Elasticsearch, Logstash and Kiabana:Elasticsearch is an open source distributed search engine, it features: distributed, 0 configuration, automatic discovery, Index auto-shard, index copy mechanism, RESTful style interface, multi-data source, automatic search load, etc.Logstash is a fully open source tool that collects, filters, and stores your logs for later use (for example, search).Kibana is also an open source and free tool that Kib

"coordinator" of your cluster.##node. master:true#node. Data:false## 3. You want this node to being neither master nor data node, but# to act as a ' search load balancer ' (fetching data from nodes,# aggregating results, etc.)##node. Master:false#node. Data:false# Use the Cluster health API [Http://localhost:9200/_cluster/health], the# Node Info API [http://localhost:9200/_nodes] or GUI tools# such as # #

Cluster.name:data-cluster node.name: "data-es-05" #node. Data:false # indexing Cache config index.number_of_ Shards:5 index.number_of_replicas:1 Index.cache.field.type:soft index.cache.field.expire:10m Index.cache.query.ena Ble:true indices.cache.query.size:2% indices.fielddata.cache.size:35% indices.fielddata.cache.expire:10m Index.sea Rch.slowlog.level:INFO #indices. RECOVERY.MAX_SIZE_PER_SEC:1GB Index.merge.scheduler.max_thread_count:2 # only for Spinning media. # Refresh config index.r

After elk ran up, my heart almost collapsed, 16G memory 16 core CPU also often error.First, Logstash and Elasticsearch simultaneously errorLogstash a large number of error, it may be es occupy too much heap, not optimized ES caused byRetrying failed action with response code:503 {: Level=>:warn}Too many attempts at sending event. dropping:2016-06-16t05:44:54.464z%{host}%{message} {: Level=>:error}Elasticsearch a large number of errors occurredToo many open filesThe value is too small. "Max_file_

= ["192.168.10.196:9200"]index = "logstash-nginx-access-%{+yyyy. MM.DD} "#codec = "JSON"Template_overwrite = True}}if [type] = = "Nginx-error" {Elasticsearch {hosts = ["192.168.10.196:9200"]index = "logstash-nginx-error-%{+yyyy. MM.DD} "codec = "JSON"Template_overwrite = True}}}Logstash-java-02.confInput {Redis {Host = "192.168.10.196"Port = 6379Password = "123.com"db = "1"data_type = "List"Key = "Java-acc

/etc/fstabYou can also add configurations to the configuration file so that the bootstrap.mlockall: true JVM can lock the memory and avoid being swapped to physical storage media.File descriptorI don't know that, either, or a file handle? Anyway is file descriptor, this is mainly because lucene to open a lot of files, Elasticsearch to start a lot of sockets, in Linux system these are processed by files, Linux will limit the number of files opened per process, you can sysctl -w vm.max_map_count=2