Users in your PROD database complain about the slow response of the transactions. While investigating the reason， you find that the transactions are waiting for the undo segments to be available， and undo retention has been set to zero. What would you do to overcome this problem？（） increase the undo retention。 create more undo segments。 create another undo tablespace。 increase the size of the undo tablespace。
计日工材料从工地现场仓库运至使用地点的人工费和施工机械使用费不包括在计日工材料基本单价内。
You are managing an Oracle Database 11g database with the following backup strategy： 1.On Sunday， an incremental level 0 tape backup is performed. 2.Monday through Saturday， acumulativeincremental level 1 tape backup is performed. Which two statements are true regarding the backups performed（） The backup performed in step 1 backs up all blocks that have ever been in use in the database. 。 The backup performed in step 2 copies all the blocks changed since the most recent level 0 backup.。 The backup performed in step 1 backs up all the blocks changed since the most recent level 1 backup.。 The backup performed in step 2 backs up all blocks that have changed since the most recent incremental backup at level 1.。
水泥砂浆防水层的施工质量检验数量，应按施工面积每（）抽查一处，每处10m2，且不得小于3处。 200m2。 100m2。 50m2。 20m2。
In the instance of the PROD database， the checkpoint （CKPT） process runs after every minute. A database user updates the rows of the ORDERS table. Because of the configuration， the CKPT process gets initiated before the user commits the transaction. What would happen to the modified blocks when the CKPT process is started？（） The modified blocks would be written to the data files.。 The modified blocks would be written to the temp files.。 The modified blocks would be written to the control file.。 The modified blocks would be written to the redo log files.。 The modified blocks would be written to the archived redo log files.。 The modified blocks would be retained in the database buffer cache.。
现代学前教育原理告诉我们，学前儿童的基本活动形式是（）
