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Choerodon平台版本：0.15.0
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运行环境(如localhost或k8s)：localhost
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遇到问题时的前置条件：
oracle数据库 -
问题描述：
我们使用Oracle数据库，使用Saga的时候一直会报错，报错日志如下
2019-12-30 09:31:53.263 ERROR 29289 --- [ XNIO-3 task-98] o.h.core.exception.BaseExceptionHandler : Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: READ_COMMITTED and SERIALIZABLE are the only valid transaction levels
org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: READ_COMMITTED and SERIALIZABLE are the only valid transaction levels
at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:305) ~[spring-jdbc-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:378) ~[spring-tx-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at io.choerodon.asgard.api.service.impl.SagaTaskInstanceServiceImpl.updateStatus(SagaTaskInstanceServiceImpl.java:182) ~[asgard-service-0.15.0.RELEASE.jar!/:1.1.2.RELEASE]
at io.choerodon.asgard.api.service.impl.SagaTaskInstanceServiceImpl$$FastClassBySpringCGLIB$$60aa9757.invoke(<generated>) ~[asgard-service-0.15.0.RELEASE.jar!/:1.1.2.RELEASE]
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:684) ~[spring-aop-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at io.choerodon.asgard.api.service.impl.SagaTaskInstanceServiceImpl$$EnhancerBySpringCGLIB$$e3f7178d.updateStatus(<generated>) ~[asgard-service-0.15.0.RELEASE.jar!/:1.1.2.RELEASE]
at io.choerodon.asgard.api.controller.v1.SagaTaskInstanceSiteController.updateStatus(SagaTaskInstanceSiteController.java:60) ~[hzero-asgard-1.0.0.RELEASE.jar!/:1.0.0.RELEASE]
at sun.reflect.GeneratedMethodAccessor387.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_201]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_201]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209) ~[spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) ~[spring-webmvc-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:891) ~[spring-webmvc-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) ~[spring-webmvc-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) ~[spring-webmvc-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974) ~[spring-webmvc-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doPut(FrameworkServlet.java:888) ~[spring-webmvc-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710) [javax.servlet-api-3.1.0.jar!/:3.1.0]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851) ~[spring-webmvc-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [javax.servlet-api-3.1.0.jar!/:3.1.0]
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.choerodon.resource.filter.JwtTokenFilter.doFilter(JwtTokenFilter.java:90) [hzero-starter-core-1.1.2.RELEASE.jar!/:1.1.2.RELEASE]
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:90) [spring-boot-actuator-2.0.6.RELEASE.jar!/:2.0.6.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:66) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) [spring-security-web-5.0.9.RELEASE.jar!/:5.0.9.RELEASE]
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357) [spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270) [spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) [spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) [spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:155) [spring-boot-actuator-2.0.6.RELEASE.jar!/:2.0.6.RELEASE]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:123) [spring-boot-actuator-2.0.6.RELEASE.jar!/:2.0.6.RELEASE]
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:108) [spring-boot-actuator-2.0.6.RELEASE.jar!/:2.0.6.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) [spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:65) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:132) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46) [undertow-core-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60) [undertow-core-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43) [undertow-core-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104) [undertow-servlet-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:336) [undertow-core-1.4.26.Final.jar!/:1.4.26.Final]
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830) [undertow-core-1.4.26.Final.jar!/:1.4.26.Final]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_201]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_201]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_201]
Caused by: java.sql.SQLException: READ_COMMITTED and SERIALIZABLE are the only valid transaction levels
at oracle.jdbc.driver.PhysicalConnection.setTransactionIsolation(PhysicalConnection.java:5380) ~[ojdbc7-12.1.0.1.0.jar!/:12.1.0.1.0]
at com.zaxxer.hikari.pool.ProxyConnection.setTransactionIsolation(ProxyConnection.java:414) ~[HikariCP-2.7.9.jar!/:na]
at com.zaxxer.hikari.pool.HikariProxyConnection.setTransactionIsolation(HikariProxyConnection.java) ~[HikariCP-2.7.9.jar!/:na]
at org.springframework.jdbc.datasource.DataSourceUtils.prepareConnectionForTransaction(DataSourceUtils.java:204) ~[spring-jdbc-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:272) ~[spring-jdbc-5.0.10.RELEASE.jar!/:5.0.10.RELEASE]
... 112 common frames omitted
2019-12-30 09:31:53.265 DEBUG 29289 --- [ XNIO-3 task-98] o.hzero.core.message.RedisMessageSource : resolve message: code=error.error, message=org.hzero.core.message.Message@7fe9d61e, language=zh_CN
2019-12-30 09:31:53.266 WARN 29289 --- [ XNIO-3 task-98] .m.m.a.ExceptionHandlerExceptionResolver : Resolved [org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: READ_COMMITTED and SERIALIZABLE are the only valid transaction levels]
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原因分析：
我看Oracle数据不支持READ_UNCOMMITTED
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疑问：
提出您对于遇到和解决该问题时的疑问