单项选择题
A.CATALOG TCPIP NODE myhost REMOTE db2srv SERVER 446
B.CATALOG TCPIP NODE mydb2srv REMOTE myhost SERVER 446
C.CATALOG TCPIP NODE myhost REMOTE db2srv SERVER 192.168.10.1
D.CATALOG TCPIP NODE mydb2srv REMOTE myhost SERVER 192.168.10.1
单项选择题 Which object may be used during query optimization to improve the performance for a subset of SELECT queries?（）
单项选择题 To which of the following resources can a lock be applied?（）
单项选择题 Application A holds an Update lock on a single row and application B is trying to read that row. If both applications are using isolation level UR, which of the following will occur?（）