甲骨文
天极网2月16日消息(戴寻严 编译)据外电报道,在日前举行的“开放源码商务大会”上,开源数据库“大佬”MySQL的首席执行官透露,数据库巨头甲骨文曾表示想收购他们,但遭到拒绝。MySQL公司的首席执行官Marten Mickos在确认甲骨文收购意图之后,并未透露有关收购价格等敏感信息。不过,他给出了回绝甲骨文的原因:即让MySQL独立地成长。Mickos说 :“我们有朝一日会成为一个大公司的一部分,但这个公司应该叫做MySQL。”
对于这番言论,甲骨文方面没有否认也没有确认。
目前尚不清楚甲骨文表示收购MySQL的时间。去年10月份,甲骨文已经买下了芬兰的开源数据库Innobase,而MySQL正是试用了Innobase的数据库引擎。本周二,甲骨文又宣布并购另外一个开源数据库公司Sleepycat(其产品名叫伯克利DB)。从甲骨文接二连三吃下开源数据库来看,埃利森觊觎作为开源数据库老大的MySQL并不出乎外界的意料。
MySQL经过近三年的开发,产品功能已经日臻成熟。在去年发布的5.0版本中已经增加了视图、触发器、存储过程等功能,显示出向企业级数据库过渡的迹象。目前,MySQL已经是最成功的开源数据库,驱动了全世界数以万计的网站后台。
一月份,MySQL表示他们已经连续两个季度盈利,但仍在接受外界的资金。本周一,MySQL宣布从英特尔、红帽和SAP等的风险投资公司获得了近1850万美元的资金。
对于甲骨文持续收购开源数据库的原因,业界认为这条数据库“大额”的真正目的是把开源用户转化成其大数据库的“付费”用户。(完)

MySQLstringtypesimpactstorageandperformanceasfollows:1)CHARisfixed-length,alwaysusingthesamestoragespace,whichcanbefasterbutlessspace-efficient.2)VARCHARisvariable-length,morespace-efficientbutpotentiallyslower.3)TEXTisforlargetext,storedoutsiderows,

MySQLstringtypesincludeVARCHAR,TEXT,CHAR,ENUM,andSET.1)VARCHARisversatileforvariable-lengthstringsuptoaspecifiedlimit.2)TEXTisidealforlargetextstoragewithoutadefinedlength.3)CHARisfixed-length,suitableforconsistentdatalikecodes.4)ENUMenforcesdatainte

MySQLoffersvariousstringdatatypes:1)CHARforfixed-lengthstrings,2)VARCHARforvariable-lengthtext,3)BINARYandVARBINARYforbinarydata,4)BLOBandTEXTforlargedata,and5)ENUMandSETforcontrolledinput.Eachtypehasspecificusesandperformancecharacteristics,sochoose

TograntpermissionstonewMySQLusers,followthesesteps:1)AccessMySQLasauserwithsufficientprivileges,2)CreateanewuserwiththeCREATEUSERcommand,3)UsetheGRANTcommandtospecifypermissionslikeSELECT,INSERT,UPDATE,orALLPRIVILEGESonspecificdatabasesortables,and4)

ToaddusersinMySQLeffectivelyandsecurely,followthesesteps:1)UsetheCREATEUSERstatementtoaddanewuser,specifyingthehostandastrongpassword.2)GrantnecessaryprivilegesusingtheGRANTstatement,adheringtotheprincipleofleastprivilege.3)Implementsecuritymeasuresl

ToaddanewuserwithcomplexpermissionsinMySQL,followthesesteps:1)CreatetheuserwithCREATEUSER'newuser'@'localhost'IDENTIFIEDBY'password';.2)Grantreadaccesstoalltablesin'mydatabase'withGRANTSELECTONmydatabase.TO'newuser'@'localhost';.3)Grantwriteaccessto'

The string data types in MySQL include CHAR, VARCHAR, BINARY, VARBINARY, BLOB, and TEXT. The collations determine the comparison and sorting of strings. 1.CHAR is suitable for fixed-length strings, VARCHAR is suitable for variable-length strings. 2.BINARY and VARBINARY are used for binary data, and BLOB and TEXT are used for large object data. 3. Sorting rules such as utf8mb4_unicode_ci ignores upper and lower case and is suitable for user names; utf8mb4_bin is case sensitive and is suitable for fields that require precise comparison.

The best MySQLVARCHAR column length selection should be based on data analysis, consider future growth, evaluate performance impacts, and character set requirements. 1) Analyze the data to determine typical lengths; 2) Reserve future expansion space; 3) Pay attention to the impact of large lengths on performance; 4) Consider the impact of character sets on storage. Through these steps, the efficiency and scalability of the database can be optimized.


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