Hash主题的文章列表，还有Hash的技术要点_第1页

什么是Hash算法

什么是Hash算法Hash，一般翻译做“散列”，也有直接音译为“哈希”的，就是把任意长度的输入（又叫做预映射，pre-image），通过散列算法。哈希算法将任意长度的二进制值映射为较短的固定长度的二进制值，这个小的二进制值称为哈希值。哈希值是一段数据唯一且极其紧凑的数值表...

开发笔记 ·2024-09-30

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

ORA-39132: object type “string”.”string” already exists with different hashcode

文档解释ORA-39132:objecttype“string”.”string”alreadyexistswithdifferenthashcodeCause:Anobjecttypecouldnotbecreatedbecausetherewasalreadyatyp...

IT技术学习 ·2023-07-28

ORA-14640: add/coalesce index partition operation is valid only for hash partitioned global indexes

文档解释ORA-14640:add/coalesceindexpartitionoperationisvalidonlyforhashpartitionedglobalindexesCause:Userattemptedtoaddorcoalesceanindexpartitionofaglobalindexnotpa...

IT技术学习 ·2023-07-28

ORA-06580: Hash Join ran out of memory while keeping large rows in memory

文档解释ORA-06580:HashJoinranoutofmemorywhilekeepinglargerowsinmemoryCause:HashJoinreserves3slots(eachslotsize=DB_BLOCK_SIZE*HASH_JOIN_MULTIBLOCK_IO_COUNT)forarow.I...

IT技术学习 ·2023-07-26

ORA-24295: max key length (string) for sorted hash cluster exceeded

文档解释ORA-24295:maxkeylength(string)forsortedhashclusterexceededCause:SortedhashclustershaveamaximumkeysizeAction:NoneORA-24295:maxkeylength(string)forsortedhashc...

IT技术学习 ·2023-07-26

ORA-39216: object type “string”.”string” hashcode mismatch

文档解释ORA-39216:objecttype“string”.”string”hashcodemismatchCause:Anobjecttypeinatransportabletablespacesetcouldnotbeusedbecausetherewasaty...

IT技术学习 ·2023-07-26

ORA-24292: no more tables permitted in this sorted hash cluster

文档解释ORA-24292:nomoretablespermittedinthissortedhashclusterCause:Asortedhashclusteronlysupportsamaximumof2tablesAction:NoneORA-24292错误是由于表已经存在于已排序的哈希簇，并且簇中不允许再添加...

IT技术学习 ·2023-07-26

ORA-39262: Cannot alter size for hash cluster.

文档解释ORA-39262:Cannotaltersizeforhashcluster.Cause:DBMS_METADATA_DIFFwascomparingtwohashclusterswithdifferentsizes.ThereisnoSQLALTERstatementtomodifythesizeofaha...

IT技术学习 ·2023-07-26

ORA-14603: [SUBPARTITIONS | SUBPARTITION TEMPLATE] subpartition_count syntax is valid only for range-hash tables

文档解释ORA-14603:[SUBPARTITIONS|SUBPARTITIONTEMPLATE]subpartition_countsyntaxisvalidonlyforrange-hashtablesCause:Thissyntaxisvalidonlyifsubpartitioningdimensionish...

IT技术学习 ·2023-07-26

ORA-14644: table is not subpartitioned by Hash method

文档解释ORA-14644:tableisnotsubpartitionedbyHashmethodCause:AsubpartitionmaintenanceoperationsuchasALTERTABLEMODIFYPARTITIONCOALESCESUBPARTITIONcanonlybeperformedon...

IT技术学习 ·2023-07-26

ORA-14269: cannot exchange partition other than a Range,List,System, or Hash partition

文档解释ORA-14269:cannotexchangepartitionotherthanaRange,List,System,orHashpartitionCause:Userattempttoexchangeapartitionwithanon-partitionedtablebutthespecifiedpar...

IT技术学习 ·2023-07-26

ORA-14285: cannot COALESCE the only partition of this hash partitioned table or index

文档解释ORA-14285:cannotCOALESCEtheonlypartitionofthishashpartitionedtableorindexCause:ACOALESCEPARTITIONcommandwasissuedwhenthereisonlyonepartitioninthetableorinde...

IT技术学习 ·2023-07-25

ORA-14192: cannot modify physical index attributes of a Hash index partition

文档解释ORA-14192:cannotmodifyphysicalindexattributesofaHashindexpartitionCause:UserattemptedtomodifyoneofINITRANS/MAXTRANS/LOGGING/STORAGEclauseforanindexpartition...

IT技术学习 ·2023-07-23

ORA-22373: Older version hashcode encountered

文档解释ORA-22373:OlderversionhashcodeencounteredCause:AnolderversionHCisencounteredwhencreatinganewversionhahscode.Currentlythisishandledinternally.Action:NoneORA-...

IT技术学习 ·2023-07-23