18) oracle 中的块清除: (DELAYED BLOCK CLEANOUT)可以提高数据库的性能,加快提交操作。 19) oracle 11g中,提供了对UNDO数据的归档,闪回数据归档,新增的后台进程FBDA用于对闪回数据进行归档 .
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这种增加的灵活性使您可以考虑更多潜在的设计方案,因而也增加了提高DB 2数据库及其应用程序性能的机会。
This added flexibility allows you to consider more potential design alternatives, and therefore increases the likelihood of improving the performance of a DB2 database and its applications.
数据库管理器通过这些统计信息可以做出决策以提高 SQL 语句的性能。
With these statistics information database manager could make a decision that would increase the performance of an SQL statement.
提高数据库的最大数量可以提高性能,但是需要更多内存。
Increasing the maximum number of databases improves performance but requires more memory.
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