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资源是有限的，多个进程对相同的资源发出申请时，导致了竞争的产生，为了解决这个问题，可以采用的方法包括 ①减少回滚段竞争 ②减少重做日志缓冲区竞争 ③修改参数以控制连接到数据库的最大进程数④减少多线程服务进程竞争 ⑤减少调度进程的竞争。
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During recent years we have heard much about "race": how this race does certain things and that race believes certain things and so on. Yet, the (21) phenomenon of race consists of a few surface indications.We judge race usually (22) the coloring of the skin: a white race, a brown race, a yellow race and a black race. But (23) you were to remove the skin you could not (24) anything about the race to which the individual belonged. There is (25) in physical structure, the brain or the internal organs to (26) a difference.There are four types of blood. (27) types are found in every race, and no type is distinct to any race. Human brains are the (28) . No scientists could examine a brain and tell you the race to which the individual belonged. Brains will (29) in size, but this occurs within every race. (30) does size have anything to do with intelligence. The largest brain (31) examined belonged to a person of weak (32) .On the other hand, some of our most distinguished people have had (33) brains.Mental tests which are reasonably (34) show no differences in intelligence between races. High and low test results both can be recorded by different members of any race. (35) equal educational advantages, there will be no difference in average standings, either on account of race or geographical location. Individuals of every race (36) civilization to go backward or forward. Training and education can change the response of a group of people, (37) enable them to behave in a (38) way.The behavior and ideals of people change according to circumstances, but they can always go back or go on to something new (39) is better and higher than anything (40) the past. 23().
The building crane, which has become the most striking feature of the urban landscape in Switzerland, is beginning to alter the mountain landscape as well. Districts of the Swiss Alps, which up to now have consisted of only a few disconnected small communities content with selling cheese and milk, perhaps a little lumber and seed potatoes, are today becoming parts of planned, developing regions. The new highway, the new skylift, the new multi-nationally-owned hotel will diversify the economy and raise the standard of living in the mountain areas, or so many Swiss regional planners and government officials hope.The mountainous area of Switzerland, which accounts for nearly two-thirds of the total area of the country and only 12% of the total population, has always been the problem area. According to the last census in 1970, 750,000 people lived in the Swiss mountains. Compared with the rest of the country, incomes are lower, services are fewer, employment opportunities are more limited and populations are decreasing. In fact, in only one respect do mountain districts come out ahead. They have more farmers, which many people do not consider to be an advantage. 17% of the Swiss mountain population works in primary occupations, in contrast to only 8% of the total population of the country.The mountain farmers are a special breed of men. They work at least twelve hours a day in topographical and weather conditions which kill most crops and which only a few animals will tolerate. About half of them work at some other jobs as well, leaving ’their wives and children to do the bulk of the farm work. In the Rhone Valley in the canton of Valais in south-western Swizerland nearly four-fifths of the farmers commute daily from their mountain farms to the large factories in the valley. In other parts of Switzerland this pattern of life is not as common, but almost everywhere n. on-farm wintertime employment is the rule.With all the difficulties inherent in working in the Swiss mountains, why should anyone resist any extension of the mountain economy The answer, as Andress Werthemann, editor of the Swiss mountain agriculture magazine Alpwirtschafiliche Monatsblatter states, is that "when tourism becomes too massive, farming disappears". And basically there are three reasons why Switzerland needs its mountain farmers: they contribute to the food supply, they preserve the landscape, and they represent the Switzerland of nostalgia and holiday dreams.But in the real world, and especially in highly industrialized Switzerland where mountain farmers are aware of the "benefits" of city living, is it possible to maintain mountain agriculture and still solve the problems of mountain communities The Swiss government has come to the conclusion that other kinds of employment in addition to farming must be emphasized. Yet whether it is possible to create other jobs that will not completely destroy agriculture is unknown. The majority of farmers in the Rhone Valley ().
常规预防白喉的方法是对易感人群接种
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