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#shm
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
HashMap
实现
原理
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
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException
Data
source
rejected
establishment
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-09881
sstasfre
sstasdel
shmdt
error
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-09882
sstasfre
sstasdel
shmctl
error
ORA-09879: sstascre/sstasat: shmat error, unable to attach tas read page
文档解释ORA-09879:sstascre/sstasat:shmaterror,unabletoattachtasreadpageCause:Errorinshmat.Action:Checkerrnoreturned.Verifythatenoughsharedmemoryisavailableonthesyst...
IT技术学习
·
2023-07-10
ORA-09879
sstascre
sstasat
shmat
error
ORA-09877: sstascre: shmget error, unable to get a shared memory segment.
文档解释ORA-09877:sstascre:shmgeterror,unabletogetasharedmemorysegment.Cause:Errorinshmget.Action:Checkerrnoreturned.Verifythatenoughsharedmemoryisavailableonthesys...
IT技术学习
·
2023-07-10
ORA-09877
sstascre
shmget
error
unable
ORA-09880: sstasfre/sstasdel: shmdt error, unable to detach tas write page
文档解释ORA-09880:sstasfre/sstasdel:shmdterror,unabletodetachtaswritepageCause:Errorinshmdt.Action:Checkerrnoreturned.ORA-09880是一个内存管理错误,由ORACLE在运行时记录的发生的,表明系统无法正确分...
IT技术学习
·
2023-07-08
ORA-09880
sstasfre
sstasdel
shmdt
error
ORA-09878: sstascre/sstasat: shmat error, unable to attach tas write page
文档解释ORA-09878:sstascre/sstasat:shmaterror,unabletoattachtaswritepageCause:Errorinshmat.Action:Checkerrnoreturned.Verifythatenoughsharedmemoryisavailableonthesys...
IT技术学习
·
2023-07-08
ORA-09878
sstascre
sstasat
shmat
error
ORA-02720: osnfop: shmat failed
文档解释ORA-02720:osnfop:shmatfailedCause:Whenthefastdriverwasinvoked,processesfailedtoattachtothesharedmemorybuffer.Youprobablysuppliedanillegalsharedmemoryattacha...
IT技术学习
·
2023-07-05
ORA-02720
osnfop
shmat
failed
MySQL Error number: MY-010246; Symbol: ER_CONN_SHM_CANT_CREATE_CONNECTION; SQLSTATE: HY000
文档解释Errornumber:MY-010246;Symbol:ER_CONN_SHM_CANT_CREATE_CONNECTION;SQLSTATE:HY000Message:Can’tcreatesharedmemoryconnection:%s.:%s错误说明:MySQL的ER_CONN_SHM_C...
IT技术学习
·
2023-07-01
MySQL
Error
number
MY-010246
Symbol
MySQL Error number: MY-010244; Symbol: ER_CONN_SHM_LISTENER; SQLSTATE: HY000
文档解释Errornumber:MY-010244;Symbol:ER_CONN_SHM_LISTENER;SQLSTATE:HY000Message:Sharedmemorysettinguplistener错误说明:MY-010244是MySQL中出现的一个错误代码,也称为ER_CONN_SHM_LISTENER,...
IT技术学习
·
2023-06-30
MySQL
Error
number
MY-010244
Symbol
MySQL Error number: MY-010245; Symbol: ER_CONN_SHM_CANT_CREATE_SERVICE; SQLSTATE: HY000
文档解释Errornumber:MY-010245;Symbol:ER_CONN_SHM_CANT_CREATE_SERVICE;SQLSTATE:HY000Message:Can’tcreatesharedmemoryservice:%s.:%s错误说明:MySQL错误MY-010245(ER_CONN_...
IT技术学习
·
2023-06-30
MySQL
Error
number
MY-010245
Symbol
MySQL Error number: MY-010105; Symbol: ER_CANT_CREATE_SHM_THREAD; SQLSTATE: HY000
文档解释Errornumber:MY-010105;Symbol:ER_CANT_CREATE_SHM_THREAD;SQLSTATE:HY000Message:Can’tcreatethreadtohandlesharedmemory(errno=%d)错误说明MY-010105错误是MySQL发出的报错...
IT技术学习
·
2023-06-19
MySQL
Error
number
MY-010105
Symbol
Java HashMap computeIfAbsent()使用方法及示例代码
publicVcomputeIfAbsent(Kkey,Function<?superK,?extendsV>remappingFunction)参数:key:与值关联的键。remappingFunction:对值进行操作的函数。返回:此方法返回与指定键关联的当前(现有或计算)值,如果映射返回null,则返...
开发笔记
·
2023-01-04
Java
HashMap
computeIfAbsent
使用方法
示例
HashMap面试题及答案(2020版)
博主整理了一些常见HashMap面试题,附参考答案,小白都能看懂的HashMap面试题总结,希望对大家有帮助哈~1.HashMap的内部数据结构数组+链表/红黑树2.HashMap允许空键空值么HashMap最多只允许一个键为Null(多条会覆盖),但允许多个值为Null3.影响HashMap性能的重要参数初始容量:创...
代码星球
·
2021-02-23
HashMap
试题
答案
2020版
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