#mAP

route-map如何实现网络配置

route-map(路由映射)是Cisco路由器中的一种功能,用于根据一系列定义的路由规则对数据包进行过滤、修改或转发。它通常用于实现特定的网络配置,如访问控制列表(ACLs)、负载均衡、故障恢复等。以下是使用route-map实现网络配置的一般步骤:定义路由规则:首先,你需要在路由器上定义一组路由规则。这些规则可以基...

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

Collectors.toMap() 抛出 “Duplicate key ***” 异常

Collectors.toMap()抛出“java.lang.IllegalStateException:Duplicatekey***”异常。Collectors.toMap()抛出“Duplicatekey***”异常,异常堆栈如下:1234567891011java...

阿里云E-MapReduce

阿里云E-MapReduce(EMR)是构建在阿里云云服务器ECS上的开源Hadoop、Spark、HBase、Hive、Flink生态大数据PaaS产品。提供用户在云上使用开源技术建设数据仓库、离线批处理、在线流式处理、即时查询、机器学习等场景下的大数据解决方案。...
开发笔记 ·2024-06-23

spring中mapper层是什么意思?

mapper层的作用是对数据库进行数据持久化操作,他的方法语句是直接针对数据库操作的现在用mybatis逆向工程生成的。mapper层,其实就是dao层,主要是做数据持久层的工作,负责与数据库进行联络的一些任务都封装在此。...

ORA-39172: Cannot remap transportable tablespace names with compatibility of string.

文档解释ORA-39172:Cannotremaptransportabletablespacenameswithcompatibilityofstring.Cause:Theuserattemptedtoremapatablespacenameinatransportabletablespacejobwhenthec...

ORA-25110: NOSORT may not be used with a bitmap index

文档解释ORA-25110:NOSORTmaynotbeusedwithabitmapindexCause:AnattemptwasmadetocreateabitmapindexusingtheNOSORToption.Action:RemoveNOSORTfromtheCREATEBITMAPINDEXstatem...
IT技术学习 ·2023-07-28

ORA-39045: invalid metadata remap name string

文档解释ORA-39045:invalidmetadataremapnamestringCause:AninvalidmetadataremapnamewasspecifiedonaDBMS_DATAPUMP.METADATA_REMAPAPIcall.Action:Correctthemetadataremapnam...

ORA-39234: Data cannot be remapped under the direct path access method.

文档解释ORA-39234:Datacannotberemappedunderthedirectpathaccessmethod.Cause:Dataremappingwasrequestedonajobthatrequiresthedirectpathaccessmethod.Dataremappingcanonly...

ORA-39232: invalid remap function: string

文档解释ORA-39232:invalidremapfunction:stringCause:Thespecifiedpackagefunctionforperformingdataremappingwasnotfound.Action:Eithercreatethespecifiedpackagefunctionor...

ORA-14300: partitioning key maps to a partition outside maximum permitted number of partitions

文档解释ORA-14300:partitioningkeymapstoapartitionoutsidemaximumpermittednumberofpartitionsCause:Therowinsertedhadapartitioningkeythatmapstoapartitionnumbergreaterth...

ORA-47033: Factor link for string and string is referred by one or more identity maps.

文档解释ORA-47033:Factorlinkforstringandstringisreferredbyoneormoreidentitymaps.Cause:Thespecifiedfactorlinkwasreferredbyexistingidentitymaps.Action:Removethedepend...

ORA-32052: failed to start mapping service

文档解释ORA-32052:failedtostartmappingserviceCause:Themappingservicefailedtostartproperly.Action:CheckFMONtracefilesforerrors.ORA-32052表明应用程序无法启动映射服务。它是一个致命错误,必须修复才...

ORA-07339: spcre: maximum number of semaphore sets exceeded.

文档解释ORA-07339:spcre:maximumnumberofsemaphoresetsexceeded.Cause:Theinternalbufferisnotbigenoughtoholdthenumberofsemaphoresetidentifiersrequested.Action:Reconfigu...

ORA-07253: spdes: semctl error, unable to destroy semaphore set.

文档解释ORA-07253:spdes:semctlerror,unabletodestroysemaphoreset.Cause:Semctlsystemcallreturnedanerror.Action:Checksemaphoresets.Mayrequiremanualcleanup.Checkadditio...
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