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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

springBoot required a bean of type org.springframework.data.redis.core.RedisTemplate

springBoot启动报错： requiredabeanoftype'org.springframework.data.redis.core.RedisTemplate' 产生这个问题的原因是：系统启动的时候没有扫描到这个RedisT...

开发笔记 ·2024-07-11

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

ORA-00001: unique constraint violated异常处理

程序中保存数据时报错，ORA-00001:uniqueconstraint(xxxx)violated先是查看数据库结构，最近也没什么改动，开发环境也正常，测试环境就报这个错后来发现主键id是自增的，查询序列的下个值 selecttable_seq.nextval fromdual发现这...

开发笔记 ·2023-10-10

PHP has encountered an Access Violation

解决方法：回收进程池...

开发笔记 ·2023-08-11

ORA-30091: secondary translation table not loaded

文档解释ORA-30091:secondarytranslationtablenotloadedCause:ThesecondarytranslationtableforDSTpatchingonTSTZdatawasnotloaded.Action:Loadthesecondarytranslationtable.错...

IT技术学习 ·2023-07-28

ORA-30027: Undo quota violation – failed to get string (bytes)

文档解释ORA-30027:Undoquotaviolation–failedtogetstring(bytes)Cause:theamountofundoassignedtotheconsumergroupofthissessionhasbeenexceeded.Action:askDBAtoincrea...

IT技术学习 ·2023-07-28

ORA-28117: integrity constraint violated – parent record not found

文档解释ORA-28117:integrityconstraintviolated–parentrecordnotfoundCause:trytoupdate/insertachildrecordwithnewforeignkeyvalues,butthecorrespondingparentrowisno...

IT技术学习 ·2023-07-28

ORA-48407: DESCRIBE and QUERY commands need at least relation name argument

文档解释ORA-48407:DESCRIBEandQUERYcommandsneedatleastrelationnameargumentCause:ThisisnorelationnameisinputasargumentAction:Needuserstoinputatleasttherelationname这是一...

IT技术学习 ·2023-07-28

ORA-48251: Failed to open relation due to following error

文档解释ORA-48251:FailedtoopenrelationduetofollowingerrorCause:SeeerrorbelowintheerrorstackAction:Seeerrorbelowintheerrorstack：ORA-48251错误是指Oracle数据库无法正常的打开某个关系表或关系...

IT技术学习 ·2023-07-28

ORA-38950: Source platform string not cross platform compliant

文档解释ORA-38950:SourceplatformstringnotcrossplatformcompliantCause:Crossplatformtransportwasnotallowedforthisplatform.Action:Foralistofsupportedplatforms,queryfix...

IT技术学习 ·2023-07-28

ORA-42311: This operation is not permitted on Editioning views with compilation errors

文档解释ORA-42311:ThisoperationisnotpermittedonEditioningviewswithcompilationerrorsCause:ALTERVIEWREADONLYandALTERVIEWREADWRITEarenotpermittedonEditioningviewswhich...

IT技术学习 ·2023-07-28

ORA-28512: cannot get data dictionary translations from string

文档解释ORA-28512:cannotgetdatadictionarytranslationsfromstringCause:ORACLEwasunabletoretrievedatadictionarytranslationinformationforthenon-Oraclesystemconnectedthr...

IT技术学习 ·2023-07-28

ORA-30363: columns in a dimension column list must be in the same relation

文档解释ORA-30363:columnsinadimensioncolumnlistmustbeinthesamerelationCause:Thedimensionstatementcontainedacolumnlistwherethecolumnsarenotallfromthesamerelation.Act...

IT技术学习 ·2023-07-28

ORA-19155: FOCH0004: collation does not support collation units

文档解释ORA-19155:FOCH0004:collationdoesnotsupportcollationunitsCause:AnerroroccurredduringtheprocessingoftheXQueryexpression.Action:Checkthedetailederrormessagefor...

IT技术学习 ·2023-07-28