多选题
You started a long transaction. Before committing， you executed a query on one of the tables currently being modified. You received the following error： ORA-01555： snapshot too old How would you prevent such an error in the future？（）
发布日期：2020-04-10
guarantee undo retention
add one more redo log group
size the redo log files appropriately
size the UNDO tablespace appropriately
size the SYSTEM tablespace appropriately
configure an appropriate undo retention interval
change automatic undo management to manual
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