HM主题的文章列表，还有HM的技术要点_第1页

HashMap的实现原理

(1)HashMap的概述HashMap是基于哈希表的Map接口的非同步（非线程安全）实现，允许使用null值和null键，此类不保证映射的顺序。(2)HashMap的数据结构HashMap实际上是一个“链表散列”的数据结构，即数组和链表的结合体。HashMap的底层就是一个数组结构，数组中的每...

开发笔记 ·2024-08-28

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: Too many connections

最简单的办法是因为你的my.ini中设定的并发连接数太少或者系统繁忙导致连接数被占满解决方式：打开MySQL安装目录打开MY.INI找到max_connections默认是100.--实例WINDOWS解决mysql Errno.:1040错误XXXXinfo:CannotconnecttoMySQLserv...

开发笔记 ·2024-04-29

LINUX常用命令：CHMOD修改文件权限 777和754

chmod777 文件或目录示例：chmod 777/etc/squid运行命令后，squid文件夹（目录）的权限就被修改为777（可读可写可执行）。如果是Ubuntu系统，可能需要加上sudo来执行：sudochmod 777/etc/squid下面具体介绍chmod命令。Linux系统...

开发笔记 ·2024-03-21

ORA-40273: invalid model type string for Adaptive Bayes Network algorithm

文档解释ORA-40273:invalidmodeltypestringforAdaptiveBayesNetworkalgorithmCause:Thevalidvaluesfortheabns_model_typesettingsare:abns_multi_feature,abns_single_feature,...

IT技术学习 ·2023-07-27

ORA-09843: soacon: Archmon unable to create named pipe.

文档解释ORA-09843:soacon:Archmonunabletocreatenamedpipe.Cause:mknod()failedtocreatenamedpipe?/dbs/arch2mon_@.Action:YourcurrentOSloginmaylackwritepermissionfortheOR...

IT技术学习 ·2023-07-26

ORA-09937: Chmod of ORACLE password file failed.

文档解释ORA-09937:ChmodofORACLEpasswordfilefailed.Cause:ORACLEwasunabletochangeapasswordfiletobereadonly.Action:ChecktheUNIXerrornumberforthespecificreason.ORA-0993...

IT技术学习 ·2023-07-26

ORA-07480: snchmod: cannot change permissions on ?/dbs/sgalm.dbf.

文档解释ORA-07480:snchmod:cannotchangepermissionson?/dbs/sgalm.dbf.Cause:Whencreatinganinstance,snlminicouldnotchangethepermissionson?/dbs/sgalm.dbfAction:Contactyo...

IT技术学习 ·2023-07-26

ORA-09881: sstasfre/sstasdel: shmdt error, unable to detach tas read page

文档解释ORA-09881:sstasfre/sstasdel:shmdterror,unabletodetachtasreadpageCause:Errorinshmdt.Action:Checkerrnoreturned.ORA-09881:sstasfre/sstasdel:shmdterror,unableto...

IT技术学习 ·2023-07-26

ORA-51001: check [string] not found in HM catalog

文档解释ORA-51001:check[string]notfoundinHMcatalogCause:checkernamemighthavebeenmisspelledAction:retryrunningcheckwithpropercheckernameORA-51001用于指示操作失败，因为Oracle无法在...

IT技术学习 ·2023-07-25

ORA-19961: compression algorithm string requires advanced compression option to be enabled

文档解释ORA-19961:compressionalgorithmstringrequiresadvancedcompressionoptiontobeenabledCause:RequestedcompressionalgorithmininitializationparameterorbyRMANconfigur...

IT技术学习 ·2023-07-25

ORA-09882: sstasfre/sstasdel: shmctl error, unable to remove tas shm page

文档解释ORA-09882:sstasfre/sstasdel:shmctlerror,unabletoremovetasshmpageCause:Errorinshmctl.Action:Checkerrnoreturned.。ORA-09882指的是，sstasfre/sstasdel过程中检测到发生shmctl错...

IT技术学习 ·2023-07-23

ORA-19962: compression algorithm string is not valid with release string

文档解释ORA-19962:compressionalgorithmstringisnotvalidwithreleasestringCause:Algorithmininitializationparameterrequiresalowercompatibilitythatiscurrentlyset.Action:...

IT技术学习 ·2023-07-23

ORA-40211: algorithm name string is invalid

文档解释ORA-40211:algorithmnamestringisinvalidCause:Algorithmnameforthemodelwasinvalidortheoperationwasnotvalidforthealgorithm.Action:Checkthealgorithmnameforthemod...

IT技术学习 ·2023-07-23

ORA-30081: invalid data type for datetime/interval arithmetic

文档解释ORA-30081:invaliddatatypefordatetime/intervalarithmeticCause:Thedatatypesoftheoperandsarenotvalidfordatetime/intervalarithmetic.Action:None？ORA-30081是Oracle...

IT技术学习 ·2023-07-19

ORA-28379: a different integrity algorithm has been chosen for the table

文档解释ORA-28379:adifferentintegrityalgorithmhasbeenchosenforthetableCause:Encryptedcolumnswereassociatedwithadifferentalgorithm.Action:Youdonotneedtospecifyanalgo...

IT技术学习 ·2023-07-18