indexing

问题 I'm trying to redirect all requests to ./index.php?site=$1 while I only want to use the part behind the last slash. So I want www.mydomain.com/firstpage to become www.mydomain.com/index.php?site=firstpage and www.mydomain.com/subfolder/anotherpage to become www.mydomain.com/subfolder/index.php?site=anotherpage But right now www.mydomain.com/subfolder/anotherpage becomes www.mydomain.com/index.php?site=subfolder/anotherpage This is what I've got: RewriteEngine on Options +SymlinksIfOwnerMatch

问题 I have Primefaces TabView with two Tab like: <p:tabView dynamic="true" cache="false" onTabShow="scrollBottom(#{stanzaBean.activeIndex})" tabChangeListener="#{messaggioBean.onTabChange}" activeIndex="#{stanzaBean.activeIndex}" > it works fine, except that when I change the Tab the activeIndex isn't updated on the Server and it returns always the default value. I'm using primefaces 2.2.1. Thank you. 回答1: Going by the PrimeFaces ShowCase example, if you give each tab an id: <p:tabView

问题 I have Primefaces TabView with two Tab like: <p:tabView dynamic="true" cache="false" onTabShow="scrollBottom(#{stanzaBean.activeIndex})" tabChangeListener="#{messaggioBean.onTabChange}" activeIndex="#{stanzaBean.activeIndex}" > it works fine, except that when I change the Tab the activeIndex isn't updated on the Server and it returns always the default value. I'm using primefaces 2.2.1. Thank you. 回答1: Going by the PrimeFaces ShowCase example, if you give each tab an id: <p:tabView

问题 I have Primefaces TabView with two Tab like: <p:tabView dynamic="true" cache="false" onTabShow="scrollBottom(#{stanzaBean.activeIndex})" tabChangeListener="#{messaggioBean.onTabChange}" activeIndex="#{stanzaBean.activeIndex}" > it works fine, except that when I change the Tab the activeIndex isn't updated on the Server and it returns always the default value. I'm using primefaces 2.2.1. Thank you. 回答1: Going by the PrimeFaces ShowCase example, if you give each tab an id: <p:tabView

问题 I have situation, where running a query that filters by an indexed column in a partitioned table, performs a full table scan. Apparently , this is a known issue in postgresql, and it's explained in detail here. Is there a more elegant way around this other than performing a query on each partition, and then performing a UNION on all of the results? 回答1: Indexes work just fine to do a scan only of the relevant partitions in PostgreSQL. But, you have to set everything up properly for it to work

问题 I have situation, where running a query that filters by an indexed column in a partitioned table, performs a full table scan. Apparently , this is a known issue in postgresql, and it's explained in detail here. Is there a more elegant way around this other than performing a query on each partition, and then performing a UNION on all of the results? 回答1: Indexes work just fine to do a scan only of the relevant partitions in PostgreSQL. But, you have to set everything up properly for it to work

问题 Previously, I asked this question about compound indexes on polymorphic foreign keys in ActiveRecord. The basis of my question was my understanding that indexes should be based on the cardinality of your column, and there's generally pretty low cardinality on Rails's STI type and polymorphic _type columns. Accepting that the answer to my question is right -- that's there's value to indexing both the high cardinality _id columns and the low cardinality _type columns, because they together they

问题 I'm beginner with MongoDB and i'm trying some stuff. I want to store URL and to avoid duplicate URL I create an unique index on the url. Like that collection.createIndex(new BasicDBObject("url", type).append("unique", true)); But each time I launch my program the index is create again isn't it ? Because, now my program is only inserting one url "http://site.com" and if I restart my program this url is insert again like if there isn't index. Creating the index each time is the wrong way to

问题 I have a reasonable number of nodes (roughly 60,000) (:Document {title:"A title"}) Given a title, I want to find the matching node, if it exists. The problem is that the title I'm given is not consistent. That is, sometimes the beginning of a new word is Capital, sometimes it is all lower case. Sometimes Key-Words are combined with Kebab case, sometimes they are written normally as key words. To compensate for that I use apoc and the Levenshtein distance between the given title and every node

问题 I have the following problem with MongoDB. I got some geo data from my home country and i have to store them into mongodb to set up a simple Web Feature Service. This service will mostly do bounding box queries using the $within operator. The data is in GeoJSON format. Therefore i imported at first the Villages and Cities which are represented as points ( [1,2] ) in this format. No problem. Next step rivers and streets which are LineStrings and according to GeoJSON represented this way [[1,2]