这个cassandra paging的解决方案怎么样？ (转载)# Database - 数据库
h*6
1 楼
765 表，也像131表一样，需要一个Letter of Explanation的单独一页的信吗？谢谢。
f*e
2 楼
【 以下文字转载自 DataSciences 讨论区 】
发信人: fatalme (don't ever give it up), 信区: DataSciences
标 题: 这个cassandra paging的解决方案怎么样？
发信站: BBS 未名空间站 (Fri Sep 26 15:52:43 2014, 美东)
As paging is a big issue of Cassandra. I have a strategy to page using
secondary index: Add a column "page_number" corresponding to each column you
want to sort and page, create an index on the "page_number" column or just
use it as the clustering column. The "page_number" is a good candidate for
indexing, since it has low cardinality: every entry in the same page has the
same page number. If there are 100 entries in one page, then there are 100
entries with the same page number. Thus is low cardinality. We can order the
entries according to each column and set the corresponding "page_number".
You can retrieve one page and do the corresponding sorting and send to
display. Is this a good way or not?
发信人: fatalme (don't ever give it up), 信区: DataSciences
标 题: 这个cassandra paging的解决方案怎么样？
发信站: BBS 未名空间站 (Fri Sep 26 15:52:43 2014, 美东)
As paging is a big issue of Cassandra. I have a strategy to page using
secondary index: Add a column "page_number" corresponding to each column you
want to sort and page, create an index on the "page_number" column or just
use it as the clustering column. The "page_number" is a good candidate for
indexing, since it has low cardinality: every entry in the same page has the
same page number. If there are 100 entries in one page, then there are 100
entries with the same page number. Thus is low cardinality. We can order the
entries according to each column and set the corresponding "page_number".
You can retrieve one page and do the corresponding sorting and send to
display. Is this a good way or not?
f*n
3 楼
这些表都不需要什么letter
h*6
4 楼
131 表的Part 7. Complete Only If Applying for Advance Parole
On a separate sheet of paper, explain how you qualify for an Advance Parole
Document, and what circumstances warrant issuance of advance parole. Include
copies of any documents you wish considered.
这个难道不是说需要一份信来解释吗？
On a separate sheet of paper, explain how you qualify for an Advance Parole
Document, and what circumstances warrant issuance of advance parole. Include
copies of any documents you wish considered.
这个难道不是说需要一份信来解释吗？
f*n
5 楼
跟着后面说什么？“ (See instructions.)” 你有没有see instructions？
Parole
Include
【在 h*****6 的大作中提到】
: 131 表的Part 7. Complete Only If Applying for Advance Parole
: On a separate sheet of paper, explain how you qualify for an Advance Parole
: Document, and what circumstances warrant issuance of advance parole. Include
: copies of any documents you wish considered.
: 这个难道不是说需要一份信来解释吗？
Parole
Include
【在 h*****6 的大作中提到】
: 131 表的Part 7. Complete Only If Applying for Advance Parole
: On a separate sheet of paper, explain how you qualify for an Advance Parole
: Document, and what circumstances warrant issuance of advance parole. Include
: copies of any documents you wish considered.
: 这个难道不是说需要一份信来解释吗？
h*6
6 楼
这个是131 instructions看看那一条说不许要信啊？俺是打算485 131 765 一起提交。
h*6
7 楼
fakeshawn，
俺看了instructions好久遍，还是看不出那条说不需要这个信，请指点一下，谢谢。
俺是140pending，现在打算485和131一起提交。
俺看了instructions好久遍，还是看不出那条说不需要这个信，请指点一下，谢谢。
俺是140pending，现在打算485和131一起提交。
f*n
8 楼
"; or
(3) If you are an applicant for adjustment of status, a copy of a USCIS
receipt as evidence that you filed the adjustment applicaiton; or ..."
如果你是一起提交，就不用receipt了
(3) If you are an applicant for adjustment of status, a copy of a USCIS
receipt as evidence that you filed the adjustment applicaiton; or ..."
如果你是一起提交，就不用receipt了
h*6
9 楼
fakeshawn,谢谢，这样的话，就不写这个信了。
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