User A executes the following command to drop a large table in your database:SQL> DROP TABLE trans; While the drop table operation is in progress, user B executes the following command on the same table:SQL> DELETE FROM trans WHERE tr_type=’SL’; Which statement is true regarding the DELETE command()
A. It fails to delete the records because the records are locked in SHARE mode.
B. It deletes the rows successfully because the table is locked in SHARE mode
C. It fails to delete the records because the table is locked in EXCLUSIVE mode.
D. It deletes the rows successfully because the table is locked in SHARE ROW EXCLUSIVE mode.
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广东"石硖"龙眼的花芽形态分化期约始于(),标志是肉眼可见龙眼()出现"红点"。
生产煤样应在确定采样点的输送机煤流中采取。对采样点没有输送机的生产矿井,可采用其他方法采样,但需在报告中注明。
A. 正确
B. 错误
内部评级法是指商业银行在满足监管当局规定的一系列监管标准的前提下,利用银行内部信用评级体系确定信用风险()要求的方法。
A. 最低经济资本
B. 最低资本充足率
C. 最低资本
D. 最高资本
砂轮机是机械厂最常用的机器设备之一,砂轮质脆易碎、转速高,容易发生机械伤害.下列有关砂轮机现场检查的记录中,符合安全要求的是()。
A. 砂轮机无专用砂轮机房,其正面装设有高度1.6m的固定防护挡板
B. 砂轮直径为砂轮卡盘直径的4倍
C. 砂轮防护罩与主轴水平线的开口角为90
D. 砂轮直径140mm,无砂轮托架