单项选择题 You are working on a 24X7 database. You want to design a backup strategy for your database that uses user managed backups. You want to be able to perform all backups while the database remains online. Which statement about performing user-managed backups in a 24x7 environment is true?（）

单项选择题 When manually configuring the SGA，which of the following parameter changes requires an instance restart to take effect？（）   "First Test， First Pass" - www.lead2pass.com 97 Oracle 1Z0-053 Exam

单项选择题 A database is running in ARCHIVELOG mode and regular backups are performed. A user receives the following error message: Which is the recommended sequence of operations you need to perform for the query successfully?（）