Examine the command: SQL> DBMS_STATS.SET_TABLE_PREFS(’SH’, ’CUSTOMERS’, ’PUBLISH’, ’false’); Which statement describes the effect of the above command()
Automatic statistics collection is stopped for the CUSTOMERS table.
B. Statistics for the CUSTOMERS table are locked and cannot be overwritten.
C. Existing statistics for the CUSTOMERS table become unusable for the query optimizer.
D. Subsequently, statistics gathered on the CUSTOMERS table are stored as pending statistics.
()年,在马克思列宁主义同中国工人运动相结合的进程中,中国共产党应运而生.
A. 1921
B. 1927
C. 1929
D. 1931
硅酸盐水泥和普通硅酸盐水泥的细度以比表面积表示,其比表面积不小于()m2/kg。
A. 300
B. 350
C. 370
D. 400