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You upgraded from a previous Oracle database version to Oracle Database version to Oracle Database12c. Your database supports a mixed workload. During the day, lots of insert, update, and deleteoperations are performed. At night, Extract, Transform, Load (ETL) and batch reporting jobs are run. The ETL jobs perform certain database operations using two or more concurrent sessions.After the upgrade, you notice that the performance of ETL jobs has degraded. To ascertain the cause ofperformance degradation, you want to collect basic statistics such as the level of parallelism, totaldatabase time, and the number of I/O requests for the ETL jobs. How do you accomplish this?()
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患者,男,56岁。患帕金森病用L-dopa治疗,最终每日用到4g,两个月后症状明显好转,为加强营养自行服用多种维生素,其中有VitB6,每天50mg,两天后病情明显加重,其原因最可能的是( )。
( )是汇率期货的价格。
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