Oracle ORA-01555(快照过旧) 一、引言: [oracle@yft yft]$ oerr ora0155501555,00000, "snapshot too old:rollback segmentnumber%swith name \"%s\" too small"//*Cause:rollback records neededby a readerfor consistentreadare// overwrittenbyother writers//*Action:IfinAutomatic Undo Management mode, ...
transaction table slot至少被覆盖一次, session 1之后访问T1″脏”块做延迟块清除时, 需要回滚transaction table. 其次, 如果我们产生足够多的undo, session 1回滚transaction table所需的undo block被覆盖, 无法对transaction table一致读, 就会触发ORA-01555. ...
提示错误ORA-01555:snapshot too old: rollback segment number X with name "XXXX" too small 简单来说,就是数据库的undo_retention设置的太小了 调大以后对于后面的闪回数据量的限制就不会那么大了
ORA-01555: snapshot too old: rollback segment number string with name "string" too small Cause: rollback records needed by a reader for consistent read are overwritten by other writers Action: If in Automatic Undo Management mode, increase undo_retention setting. Otherwise, use larger rollback ...
ORA-01555: snapshot too old: rollback segment number 6 with name "_SYSSMU6_12 The error might occur only in the application log, but not necessarily in the alert file. There may or may not be a current SQL reported in the incident trace file: --- Error Stack Dump --- ORA-01555:...
ORA-01555: Snapshot too old: rollback segment number Last Update: May 11, 2023 10:22:45 AM Updated By: Sonja_Bauernfeind Created date: Jul 21, 2020 1:58:52 PM The ORA-01555 is caused by Oracle read consistency mechanism. If there are lots of updates, long ...
我的系统提示ora-01555,查询代码含义提示:ORA-01555:snapshot too old and how to avoid it Rollback segments hold pre-images of changed data.These pre-images are held for two purposes:to enable a transaction to be rolled back and,crucially,to enable Oracle to return read-consistent views of ...
ORA-01555: snapshot too old: rollback segment number with name "" too small ORA-22924: snapshot too old CAUSE LOB data doesn't use the Undo segment for retaining the read consistent images. The old versions are stored in the LOB Segments itself, before any DMLs. ...
ORA-01555: snapshot too old: rollback segment number 107 with name "_SYSSMU107_1253191395$" too small 注意,这个错误提示跟上面不一样。"_SYSSMU107_1253191395$"表示UNDO数据是在UNDO表空间的。 这个ORA-1555错误报告是在访问UNDO表空间的UNDO数据时发生错误的,用后续的方法来诊断问题。