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事务隔离级别(IsolationLevel)

事务的特性（ACID）1、原子性（Atomicity）　　事物是数据库的逻辑工作单位，事务中的诸多操作要么全做要么全不做2、一致性（Consistency）　　事务执行结果必须是使数据库从一个一致性状态变到另一个一致性状态3、隔离性（Isolation）　　一个数据的执行不能被其他事务干扰4、持续性/永久性（Durab...

开发笔记 ·2024-09-02

CountDownLatch是什么？

CountDownLatch是Java中一个同步工具类，用于控制多个线程的执行顺序。它可以让某个线程一直等待，直到其他线程完成各自的操作后再继续执行。CountDownLatch通过一个计数器来实现，计数器的初始值为线程数量，每当一个线程完成任务后，计数器的值就会减1，当计数器的值变为0时，等待的线程就会被唤醒继续执行...

开发笔记 ·2024-03-19

Vue3中的readonly怎么使用

在Vue3中，可以通过readonly函数将一个对象转化为只读的，使其属性成为只读的，无法被修改。使用方法如下：import{readonly}from'vue';constmyObject={name:'Alice',age:25};constreadonlyObject=readonly(myObject);//尝...

开发笔记 ·2024-03-10

ORA-64143: Can only share an existing XMLIndex table with an XMLTYPE column.

文档解释ORA-64143:CanonlyshareanexistingXMLIndextablewithanXMLTYPEcolumn.Cause:AnattemptwasmadetoshareatablewithoutanXMLTYPEcolumn.Action:DropthegroupcontainingtheX...

IT技术学习 ·2023-07-28

ORA-25100: TABLESPACE option can only be used with ALTER INDEX REBUILD

文档解释ORA-25100:TABLESPACEoptioncanonlybeusedwithALTERINDEXREBUILDCause:TheTABLESPACEoptiontoALTERINDEXwasusedwithouttheREBUILDoption.Action:UseALTERINDEXREBUILDT...

IT技术学习 ·2023-07-28

ORA-19955: only one open thread is allowed to change the DBID

文档解释ORA-19955:onlyoneopenthreadisallowedtochangetheDBIDCause:Theoperationfailedbecausetherewereactivethreadsinthedatabase.Themostlikelycauseisthatthedatabasecra...

IT技术学习 ·2023-07-28

ORA-42036: cannot online redefine temporary table “string”.”string”

文档解释ORA-42036:cannotonlineredefinetemporarytable“string”.”string”Cause:Anattemptwasmadetoredefineatemporarytable.Action:Donotattempttoon...

IT技术学习 ·2023-07-28

ORA-25009: Nested table clause allowed only for INSTEAD OF triggers

文档解释ORA-25009:NestedtableclauseallowedonlyforINSTEADOFtriggersCause:TriggersonnestedtablescanonlybecreatedonviewcolumnsusingINSTEADOFtriggers.Action:Useviewnest...

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-19768: USING clause only valid with ENABLE CHANGE TRACKING

文档解释ORA-19768:USINGclauseonlyvalidwithENABLECHANGETRACKINGCause:TheUSINGclausewasspecifiedwithDISABLECHANGETRACKINGAction:Correctthestatement.ORA-19768：USING子句仅...

IT技术学习 ·2023-07-28

ORA-25310: Subscriber is Notification only; dequeue not supported

文档解释ORA-25310:SubscriberisNotificationonly;dequeuenotsupportedCause:Notificationonlysubscribersarenotallowedtodequeue.Action:Recreatesubscriberifnecessary.ORA-2...

IT技术学习 ·2023-07-28

ORA-26724: only SYS is allowed to set the Capture or Apply user to SYS.

文档解释ORA-26724:onlySYSisallowedtosettheCaptureorApplyusertoSYS.Cause:TheCaptureorApplyuserwasspecifiedasSYSbyauserotherthanSYS.Action:SetSYSastheCaptureorApplyus...

IT技术学习 ·2023-07-27

ORA-14703: The AFTER clause can be used to ADD PARTITION only to a System Partitioned table.

文档解释ORA-14703:TheAFTERclausecanbeusedtoADDPARTITIONonlytoaSystemPartitionedtable.Cause:ThetableisnotpartitionedbytheSystemmethodAction:SkiptheAFTERclause.ORA-14...

IT技术学习 ·2023-07-27

ORA-29318: datafile string is online

文档解释ORA-29318:datafilestringisonlineCause:Thedatafileisonline.Action:Takethedatafileoffline.ORA-29318是Oracle数据库的一个警告错误，表明指定的数据文件已经被Oracle数据库标记为“线上”，这个错误状态会导致拒绝访...

IT技术学习 ·2023-07-27

ORA-27127: unable to unlock shared memory segment

文档解释ORA-27127:unabletounlocksharedmemorysegmentCause:insufficientprivilegestounlocksharedmemorysegmentAction:makesureprocessisrunningwithnecessaryprivileges.ORA...

IT技术学习 ·2023-07-27