IndexWriter允许用户指定可选索引删除策略。
IndexWriter lets users specify an optional index deletion policy.
这使得从一个轻轻零碎的索引，删除碎片更好的选择，但从碎片索引删除碎片糟糕的选择。
This makes it a better choice for removing fragmentation from a lightly fragmented index, but a poor choice for removing fragmentation from a heavily fragmented index.
这个脚本将会提示您要么删除现存的索引，要么创建一个新的索引。
This script will prompt you to either delete the existing index or create a new index.
如果某人删除了索引，程序就不能工作，除非程序员进行更改。
If someone removes the index, the program will not work unless the programmer makes changes.
它提供在索引中添加、删除和更新文档的方法。
It provides methods to add, delete, or update documents in the index.
因为增量索引可以添加和删除条目，所以多个执行任务可导致重复或丢失项。
As incremental indexing can add and delete entries, multiple executing tasks can lead to duplicate or missing entries.
如果从一个带有10个索引的表删除一行，DB 2必须删除与被删除的行关联的所有索引条目。
Delete a row from a table with 10 indexes, and DB2 must remove all index entries associated with the deleted rows.
您可以根据通过这些方法获得的信息删除不需要的索引。
Based on that information, you can delete indexes that are not required.
该接口用来实现从索引目录中定制删除过时提交的策略。
An interface used to implement a policy to customize deletion of stale commits from the index directory.
DB 2V8.2.2中这种新的DELETE算法可以显著减少与mdc表中行及其相应的块索引的删除相关的日志记录和处理。
This new DELETE algorithm in DB2 V8.2.2 can drastically reduce the logging and processing associated with the deletion of rows in an MDC table and its corresponding block indexes.
注意：使功能失效要在删除所有索引之前进行，如果需要可以取消用户帐户权限，这样就不会导致用户的错误。
Note: Disabling the feature should be done before dropping all indexes and if desired, revoking permissions of the user account, so that no user errors will result.
以其他方式修改数据库，包括添加、删除或修改索引或其他约束。
Changing the database in other ways, including adding, dropping, or modifying indexes or other constraints.
不要添加了新索引，又保留已有的索引，或者仅仅是删除了已有的索引。
Don't add the new index and keep the existing one or simply drop the existing index.
那意味着，无论何时添加或删除分区，都必须在分区表的所有现有索引中添加或删除对应记录。
This meant that whenever partitions were added or removed, corresponding records had to be added to or removed from any indexes that existed for the table.
更糟的是，GAE没有提供简单的方式来删除不再使用的索引。
Making matters worse, GAE provides no easy way to delete indexes that are no longer in use.
这说明，在创建或删除函数索引时，执行索引的表中始终持有一个排他锁。
This means that an exclusive lock is always placed on the indexed table while a functional index is being created or dropped.
如果您决定删除索引，那么首先要保存它的CREATEindex语句，以便在需要时轻松地重新创建它。
If you do decide to drop an index, you should first save its create index statement so that you can easily recreate it if necessary.
在图6显示的下一个面板中，建议表明有些索引可以删除。
On the next panel, shown in Figure 6, the recommendations show there are indexes that can be dropped.
可以添加或删除索引。
这些冲突操作包括：压缩、重新打包、收缩、更改、在线索引构建、截断、以及删除。
These conflicting operations include: compress, repack, shrink, alter, online index build, truncate, and drop.
结果我们比以前多了很多的表，但添加和删除索引却很容易。
As a result, we end up having more tables than we had before, but adding and removing indexes is easy.
在config - wcm - repository任务期间，WPSconfig . sh删除现有索引。
WPSconfig.sh will remove the existing indexes during the config-wcm-repository task.
B -TreeScanner自动判断哪些索引项应该删除。
The B-Tree Scanner automatically determines which index items are to be deleted.
B - TreeScanner线程会去掉删除的索引项并重新平衡索引节点。
The B-Tree Scanner threads remove deleted index entries and rebalance the index nodes.
在不锁定表的情况下创建和删除索引。
removeDownstream获得被单击页面的索引并删除位于该给定索引之后的所有页面，如清单15所示。
RemoveDownstream gets the index of the page that was clicked on and removes all pages that are located after that given index as illustrated in Listing 15.
如果有IRD索引在mdc表上也有定义，DB2将使用传统方法(DB 2V8.2.2之前的行为)记录每个RID，并将它们从每个RID索引中删除。
If there are RID indexes that are also defined on the MDC table, DB2 will log and remove each RID from each of the RID indexes using the traditional approach (the behavior before DB2 V8.2.2).
当您建立索引激活不能区分大小写查询程序以后，您稍后可能希望能够删除单个的索引。
After you have built indexes to enable case-insensitive queries, you may later want to be able to remove individual indexes. You can drop an index by following these steps.
Google很快会删除YouTube上的版权内容，但不会在搜索索引中快速删除整个侵权网站。
Google has been quick to remove copyrighted material from services like YouTube where it hosts the content, but it has not been so quick to remove infringing sites entirely from its search index.
例如，一个关于事件的网页应该以“事件”作文主题，而不是为某个特定事件编写索引，这样就可以经常往索引中添加或删除内容。
For example, a page on events should be indexed for the topic of “Events,” but not for the specific events themselves, which would be constantly added and deleted.
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