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e40540
p10-5
Oracle Database uses SCNs to mark the SCN
before which all changes are known to be on disk so that recovery avoids applying unnecessary redo.
The database also uses SCNs to mark the point
at which no redo exists for a set of data so that recovery can stop.
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例句
There are several additional implementation classes
, that can be used together with the ones provided by Java.
非限定性定语从句
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例句
e40540 17-19
For example, a SQL statement
that directly accesses a remote target through a gateway
can concatenate two columns as part of the SELECT statement.
最后判断是同位语从句，而不是定语从句。
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例句
This feature efficiently identifies and captures data
that has been added to, updated in, or removed from, relational tables
and makes this change data available for use by applications or individuals.
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this is the number of packets that tcpdump has received and processed
宾语从句
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例句
the meaning of this depends
on the OS on which you're running tcpdump,
and
possibly on the way the OS was configured
两个并列定语从句
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例句
The chapter also describes the dynamic performance views, which are special views that are continuously updated while a database is open and in use.
语法分析
定语从句嵌套了一个让步状语从句
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例句
An important part of an Oracle database is its data dictionary, which is a read-only set of tables that provides administrative metadata about the database.
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例句
this is very likely to cause an error
词法分析
句法分析
首先，分块
this
is very likely
very(很，adv) likely(adv,(很)可能 [前面常有 more, quite 或 very 等修饰])，
副词修饰副词，结果是副词作表语
to cause an error.
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例句
the standard way to prevent this is to enclose the entire real contents of the file in a conditional.
词法分析
句法分析
首先，分块
the standard way to prevent this 主语
is to enclose 系动词加表语
the entire real contents of the file in a conditional.
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例句
In the past,it has been abused as a text processor.
语法分析
完成时态，as作介词使用
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例句
It will choke on input which does not obey C's lexical rules.
语法分析
将来时态包含了一个某个从句（暂时无法判断）
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simply learning,simply best
本义
simply adv.
learning 动名词还是现在分词不太确定
best 形容词，副，名，动
此句解析：
副词simply修饰（好像是现在分词）learing，副词simply修饰形容词best
简单学习，简单最好
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