SHM主题的文章列表，还有SHM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

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-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-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-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-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-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-02720: osnfop: shmat failed

文档解释ORA-02720:osnfop:shmatfailedCause:Whenthefastdriverwasinvoked,processesfailedtoattachtothesharedmemorybuffer.Youprobablysuppliedanillegalsharedmemoryattacha...

IT技术学习 ·2023-07-05

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-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-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-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

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

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