PS:Oracle Database在几个月前发布12c 最新版本,基于云计算的旗舰产品,称之为“第一个为云而设计的数据库”。有部分项目数据库使用的是Oracle,有时也被同事询问oracle的收费模式,下面把oracle的授权收费模式简要说明一下。 Oracle软件本身是免费的,所
PS:Oracle Database在几个月前发布12c 最新版本,基于云计算的旗舰产品,称之为“第一个为云而设计的数据库”。有部分项目数据库使用的是Oracle,有时也被同事询问oracle的收费模式,下面把oracle的授权收费模式简要说明一下。 Oracle软件本身是免费的,所以任何人都可以从Oracle官方网站下载并安装Oracle的数据库软件,收费的是License,即软件授权,如果数据库用于商业用途,就需要购买相应Oracle产品的License。 现在Oracle有两种授权方式,按CPU(Process)数和按用户数(Named User Plus)。前一种方式一般用于用户数不确定或者用户数量很大的情况,典型的如互联网环境,而后一种则通常被用于用户数确定或者较少的情况。 按CPU: License数=CPU 数*系数。系数来自Oracle的一个参数表,如IBM Power6的处理器为1,AMD和Intel的处理器为0.5,详细情况见下: 参数 处理器型号 0.25 Sun UltraSPARC T1 处理器 0.50 Sun UltraSPARC T1处理器 0.50 Intel、AMD处理器 0.50 Sun UltraSPARC T2+ 处理器 1.00 IBM POWER6、POWER7 处理器 0.75 其他多核处理器 1.00 单核处理器 则根据公式可以算出,一个SUN UltraSparc T1的4*8核处理器需要4*8*0.25=8个CPU licenses 按用户数:Oracle用户数的官方定义是每一个访问Oracle数据库的用户,无论是自然人还是设备(如工业环境中的传感器之类),都算作一个用户(Named User)。 英文官方定义:Named User Plus: is defined as an individual authorized by you to [...]原文地址:Oracle数据库如何授权收费(Database Licensing), 感谢原作者分享。

MySQLviewshavelimitations:1)Theydon'tsupportallSQLoperations,restrictingdatamanipulationthroughviewswithjoinsorsubqueries.2)Theycanimpactperformance,especiallywithcomplexqueriesorlargedatasets.3)Viewsdon'tstoredata,potentiallyleadingtooutdatedinforma

ProperusermanagementinMySQLiscrucialforenhancingsecurityandensuringefficientdatabaseoperation.1)UseCREATEUSERtoaddusers,specifyingconnectionsourcewith@'localhost'or@'%'.2)GrantspecificprivilegeswithGRANT,usingleastprivilegeprincipletominimizerisks.3)

MySQLdoesn'timposeahardlimitontriggers,butpracticalfactorsdeterminetheireffectiveuse:1)Serverconfigurationimpactstriggermanagement;2)Complextriggersincreasesystemload;3)Largertablesslowtriggerperformance;4)Highconcurrencycancausetriggercontention;5)M

Yes,it'ssafetostoreBLOBdatainMySQL,butconsiderthesefactors:1)StorageSpace:BLOBscanconsumesignificantspace,potentiallyincreasingcostsandslowingperformance.2)Performance:LargerrowsizesduetoBLOBsmayslowdownqueries.3)BackupandRecovery:Theseprocessescanbe

Adding MySQL users through the PHP web interface can use MySQLi extensions. The steps are as follows: 1. Connect to the MySQL database and use the MySQLi extension. 2. Create a user, use the CREATEUSER statement, and use the PASSWORD() function to encrypt the password. 3. Prevent SQL injection and use the mysqli_real_escape_string() function to process user input. 4. Assign permissions to new users and use the GRANT statement.

MySQL'sBLOBissuitableforstoringbinarydatawithinarelationaldatabase,whileNoSQLoptionslikeMongoDB,Redis,andCassandraofferflexible,scalablesolutionsforunstructureddata.BLOBissimplerbutcanslowdownperformancewithlargedata;NoSQLprovidesbetterscalabilityand

ToaddauserinMySQL,use:CREATEUSER'username'@'host'IDENTIFIEDBY'password';Here'showtodoitsecurely:1)Choosethehostcarefullytocontrolaccess.2)SetresourcelimitswithoptionslikeMAX_QUERIES_PER_HOUR.3)Usestrong,uniquepasswords.4)EnforceSSL/TLSconnectionswith

ToavoidcommonmistakeswithstringdatatypesinMySQL,understandstringtypenuances,choosetherighttype,andmanageencodingandcollationsettingseffectively.1)UseCHARforfixed-lengthstrings,VARCHARforvariable-length,andTEXT/BLOBforlargerdata.2)Setcorrectcharacters


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