ORA-55568: The maximum query length (mql) value should be atmost string based on the current _highthreshold_undoretention setting.
文档解释ORA-55568:Themaximumquerylength(mql)valueshouldbeatmoststringbasedonthecurrent_highthreshold_undoretentionsetting.Cause:Themaximumquerylength(mqlinminutes)w...
ORA-32600: RETENTION and PCTVERSION cannot be used together
文档解释ORA-32600:RETENTIONandPCTVERSIONcannotbeusedtogetherCause:cannotusebothRETENTIONandPCTVERSIONtogether.Action:UseeitherRETENTIONorPCTVERSION.Oracle的ORA-32600...
ORA-55567: The _highthreshold_undoretention value should be at least string based on the current undo retention settings.
文档解释ORA-55567:The_highthreshold_undoretentionvalueshouldbeatleaststringbasedonthecurrentundoretentionsettings.Cause:The_highthreshold_undoretentionvaluewasnotgr...
Java注解之Retention、Documented、Target、Inherited介绍
先看代码，后面一个个来解析：@Retention(RetentionPolicy.RUNTIME)@Target(value={ElementType.METHOD,ElementType.TYPE})@Documentedpublic@interfaceAuthority{} Retention...
java的四个元注解 @Retention @Target @Document @Inherited
1. @Retention :注解的保留位置 @Retention(RetentionPolicy.SOURCE) //注解仅存在于源码中，在class字节码文件中不包含 &...