不同光谱型星的起源必然是不一样的。
The origins of stars of differing spectral types must be dissimilar.
NASA说乘员已经下传了有关一个断了两个齿的小型星型齿轮的视频和图像。
NASA said the crew had sent down video and photographs of a small star-shaped gear with two broken teeth. Experts were trying to determine whether it was related to the problem.
NASA说乘员已经下传了有关一个断了两个齿的小型星型齿轮的视频和图像。
NASA said the crew had sent down video and photographs of a small star-shaped gear with two broken teeth.Experts were trying to determine whether it was related to the problem.
本实用新型的切割型星型卸灰阀可以对落下的滤袋进行切割，保证卸灰阀正常运转。
The cutting-type star dust discharge valve can perform cutting to a falling filter bag, and ensures the normal operation of the dust discharge valve.
早型O，B型星有扩散运动和自转运动，而晚型发射线星则没有明显的扩散或收缩的整体运动。
The expansion and rotation of the early O, B type stars have been found, but the similar motions are not discernible for the late-type stars.
O型星的寿命更短（几百万年或者更少），在从星团分崩出来之前，它们就像超新星 一样爆炸了。
The O stars are so short lived (a few million years or even less), they explode as supernovae before they can be scattered outside the cluster.
红外成像揭示了这片叫做M17SWex的深色的云正在疯狂地制造新星，但是质量最密的O型星还没有孵出来。
The infrared image reveals that this dark cloud, called M17 SWex, is forming stars at a furious rate but has not yet spawned the most massive type of stars, known as O stars.
研究小组发现了B型星在星系中的分布甚至比更巨大的O型星还要广泛的事实，这为疏散星团的瓦解迅速提供了佐证。
The rapid disintegration of open clusters is reinforced by the fact that the team found that the B stars are significantly more spread in the galaxy than even the more massive O-type.
天文学家还探测到有一些较老较小的M型星，它们发射的X射线实际上比太阳更加光辉灿烂，而先前人们却认为它们是十分幽暗的。
Astronomers have also detected older and smaller m stars, previously thought to be quite dim, that actually outshine the sun in their X-ray emission.
在您看到星型连接优化的优点后，本文通过带有注释的解释输出准确地告诉您星型连接计划的信息是如何出现在解释文件中的。
After you see the advantages of star join optimization, this article provides annotated explain output to show you precisely how star join plan information appears in explain file.
在这种情况下，任何索引的第一行，不管简单或复杂，都是满足星型联接的一个候选者。
In this case, the first column of any index, simple or compound, is a candidate to satisfy the star join.
我们使用前面的同一个示例查询来说明如何解释星型连接计划的SETEXPLAIN输出。
To show how to interpret SET EXPLAIN output for star join plans, we use the same example query as before.
一个星型连接查询通常包含一个事实表和几个维度表，事实表和每个维度表之间都有连接谓词。
A star join query typically involves a fact table and several dimension tables, with join predicates between the fact table and each dimension table.
星型连接也支持雪花模式。
所有新的星型连接指令都是查询层次的指令，会影响查询的执行。
All the new star join directives are query level directives that affect the execution of a query.
利用下推连接技术的星型连接计划使得散列连接更加有效的主要原因是，在初期减少了事实表(探测表)的行数。
A star join plan utilizing push-down hash join technology makes hash joins more effective primarily due to reduction of fact table (probe table) rows early on.
按照典型的星型数据库设计，一个事实表包含按产品、地区和时间段排序的销售数据。
Using a typical star schema database design, a fact table might contain sales data by product, region, and time period.
本文还介绍了星型连接在解释输出中是如何表示的。
It also shows how star join is represented in explain output.
星型连接计划利用下推散列连接技术。
为了实现星型连接查询的最佳执行计划，优化器在适当的时候会考虑星型连接优化，并根据成本因素来决定星型连接计划。
The optimizer considers star join optimization when appropriate and decides on star join plan based on cost considerations in order to come up with best execution plan for a star join query.
如果查询中使用星型连接指令，指令会将会话环境设置覆盖。
If star join directives are used in a query, directives override session environment setting.
IWA技术以压缩格式将数据仓库星型架构中的记录载入内存，并使用新的列存储技术来组织数据。
IWA technology loads the records from a data warehouse star schema into memory in a compressed format, and organizes the data using new columnar storage technology.
当使用“强制”选项时，当前会话的所有查询只要可能就使用星型连接计划。
When the "forced" option is used, star join plans will be favored whenever possible for all queries in current session.
设计数据库时必须将维度模式星型架构与IWA相结合，必须定义表格并将它们载入IWA中，以充分利用IWA的性能。
A database must be designed using a dimensional model star schema to work with IWA, and the tables must be defined and loaded into IWA to take advantage of its performance.
SETOPTIMIZATIONENVIRONMENTFACT语句针对当前会话的所有查询，用于指定一个在星型连接优化中可被视为事实表的表清单。
The SET OPTIMIZATION ENVIRONMENT FACT statement can be used to specify a list of tables that can be considered as fact tables during star join optimization for all queries in the current session.
星型连接计划中，数据库服务器在维度表中构建散列表的同时从维度表中下推键来过滤事实表。
In a star join plan, the database server pushes down keys from a dimension table to filter the fact table at the same time as it builds the hash table on the dimension table.
模式不需要明确指定一列是主键或唯一键来产生星型连接计划。
The schema does not need to specify explicitly that a column is a primary or unique key to produce a star join plan.
这个星型体系结构由中心的源存储库和工作于这个存储库的多个开发人员组成(参见图1)。
This star architecture is illustrated as a central source repository with multiple developers working around it (see Figure 1).
STAR_JOIN—STAR_JOIN指令指示优化器尽可能地选择星型连接计划。
STAR_JOIN - the STAR_JOIN directive instructs the optimizer to favor a star join plan whenever possible.
新的优化器指令和会话环境控制因为影响优化器对星型连接优化的考虑，所以文中也包含了它们的介绍。
New optimizer directives and session environment controls are also introduced for influencing optimizer consideration of star join optimization.
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