p*1
2 楼
HP申请一个create partially sorted index的专利 (US 2008/0104102)。
"To provide an index for a table in a database system, the index is
partially sorted in an initial phase of building the index. Subsequently, in
response to accessing portions of the index to process a database query,
further sorting of the accessed portions of the index is performed."
it is using B-Tree, divid index into different internal nodes, will sort the nodes (but not the entire tree). where each node may overlap with each other.
"To provide an index for a table in a database system, the index is
partially sorted in an initial phase of building the index. Subsequently, in
response to accessing portions of the index to process a database query,
further sorting of the accessed portions of the index is performed."
it is using B-Tree, divid index into different internal nodes, will sort the nodes (but not the entire tree). where each node may overlap with each other.
n*y
3 楼
I k this song...
【在 g******n 的大作中提到】
【在 g******n 的大作中提到】
v*r
4 楼
Oracle 的 B-Tree 是 fully sorted,好像没有这种 partilly sorted 的
implementation. 和 "fully sorted" 比较， "partilly sorted" 应该speed up
insert new record, but will slow down query using index.
implementation. 和 "fully sorted" 比较， "partilly sorted" 应该speed up
insert new record, but will slow down query using index.
s*s
5 楼
顶 五轮真弓
m*n
6 楼
I love this song
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