The granularity of locking used on an index can be set using the CREATE INDEX and ALTER INDEX statements.

指定的索引名称必须与当前的现有索引相同；但可以修改索引定义。

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SQL described tables and indexes can also be placed and moved by the corresponding ALTER TABLE or ALTER INDEX commands.

SQL 描述的表和索引也可以通过对应的 ALTER TABLE 或 ALTER INDEX 命令放置和移动。

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An automatic index update can be specified as an index attribute during the index creation or specified later using an alter index command.

自动索引更新可以在创建索引时用索引属性指定，也可以以后使用alter index命令指定。

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Shining an appropriate light on such a wire from the outside would alter its refractive index (a measure of how fast light travelling inside the wire can move).

ECONOMIST: New-age crystals