[多选]
A user receives the following error while executing a query：
ORA01555：snapshot too old
Which two options can be the solutions to avoid such errors in future？（）

A . increase the size of redo log files
B . increase the size of the undo tablespace
C . increase the size of the Database Buffer Cache
D . increase the size of the default temporary tablespace
E . enable the retention guarantee for the undo tablespace

简述保险公司获得准被保险人的信息来源。对于软件开发企业（或政府机关），平面设计宜采用的方法是（）。物料流向图法。作业相关图法。模型法。从至表法。 Which of the following is not an advantage of block media recovery （BMR）？（） Reduced MTTR.。 Datafiles remain offline while corrupt blocks are repaired.。 Datafiles remain online while corrupt blocks are repaired.。 A and C。受极端变量值影响的集中趋势度量指标是（）。众数。中位数。算术平均数。调和平均数。几何平均数。创业风险来源于（）管理风险。市场风险。技术风险。资金风险。人力资源风险。

A user receives the following error while executing a query：
ORA01555：snapshot too old
Which two options can be the solutions to avoid such errors in future？（）

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[多选] A user receives the following error while executing a query： ORA­01555：snapshot too old Which two options can be the solutions to avoid such errors in future？（）

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[多选]
A user receives the following error while executing a query：
ORA01555：snapshot too old
Which two options can be the solutions to avoid such errors in future？（）