indexing

问题 I am currently working with mongoDB trying to index quite a large database. It has a field in every document called "content" that is of varying length. I have tried indexing it once, it ran for 2 hours, completed the indexing, but didn't build it because it came across something larger than 1024 bytes. I tried reading the limits manual, but I am not sure I 100% understand what these limits mean. Is it the "content" field that can be max 1024 bytes? Like so: { "Content" : "Can this be max

问题 I recently moved my website from Wix.com to one that I created on GoDaddy (Windows server). Wix.com version used https, and the latter doesn't. Searching for the website on Google still lists the "https://*" version (which doesn't exist anymore) instead of listing the "http://" version. Question 1: How should I redirect visitors from https to http version without having to set up SSL on the new website? Adding this to web.config didn't help: <rewrite> <rules> <rule name="Redirect to HTTP"

问题 I'm trying to hash a students database based on their ID (all their information is read through a text file). The hash-function I must use is the modulo of the sum of the ASCII code of each character in the ID, divided by an odd number representing the number of the hash 'buckets'. For example, if the students ID is AE797989 and m=11: Hash(AE797989)= [ASCII(‘A’)+ ASCII(‘E’)+ ASCII(‘7’)+ ASCII(‘9’)+ ASCII(‘7’)+ ASCII(‘9’)+ ASCII(‘8’)+ ASCII(‘9’)] mod m. My text file consists of 19 students and

问题 I have two sets of classifications ( Lc1 and Lc2 ) and two sets of probabilities ( Lp1 and Lp2 ). Lp1 is the set of probabilities that describes the classification likelihood in Lc1 . I want to combine the information in Lc1 and Lc2 using the classifications that are the most probable into class_result . import numpy as np #example data Lp1 = np.ones((2,2))*0.5 Lc2 = np.ones((2,2)) Lc1 = np.ones((2,2)) Lp2 = np.ones((2,2))*0.5 #Change some values for the example Lp1[1,1] =0.95 Lc1[1,1] = 0

问题 I have a large set of data in the MySQL version 5.6 And Suppose name columnA, columnB, & columnC. columnA(bigint) columnB(bigint) Time(timestamp) Where I have applied BTREE UNIQUE INDEXING. But When I explaining my query, I am getting all rows traversed. I have tried to Analyze, Repair table but no luck. Note: In different tables, I am getting expected result after applying to index. The size of columnA(bigint 20) where I am having an issue, is more than 50,000. I want one row traversed after

问题 I have the following problem in python: I have several numpy 2d-arrays where all have same number of columns ,but different number of rows.I want to index all these 2d-array in a unique numpy 3d-array where the first index keeps into account each 2d-array. For example : let's suppose I got two 2d-arrays like this : [[1,2,3][4,5,6][7,8,9]] (3X3 array) [[11,12,13][14,15,16]] (2X3 array) I want to get a numpy 3d-array name,for example, c where : c[0] has shape (3,3), c[1] (2,3) and so on...So I

问题 I have a model which is: @Document(indexName = "index", type = "logs") public class Log { @Id private String id; private String test_no; private String entire_log; private String method; private String timestamp; private String thread_name; private String level; private String logger_name; private String formatted_message; // CONSTRUCTORS, GETTERS AND SETTERS... } I have an applicationContext.xml file which contains a bean, used to save the value of the dynamic index. The location of this

问题 Lets say I initialized two global arrays of semaphores, semaphore empty[someNum]; and semaphore full[someNum]; and someNum is initialized as const int someNum = 3; (globally) I'll have a method called init() and inside is a for-loop to help index those arrays. for (index=0; index<someNum; index++) num[index]=0; my goal is to use commands like wait and signal certain semaphores in the array, for example if num is full, then I do not want my producer to place a value into it. inside of init() I

问题 Is it OK if I create a composite primary key from 4 columns? Like: PRIMARY KEY(name, slug, type, parent) So there should not be more than one row with the same name, slug, type and parent. Are there too many columns? Will it affect performance? I'm using sqlite btw. 回答1: It's usually recommended to have an ID field that is unique on its own. Comparing INTEGER values is faster than comparing strings, so your composite key will affect performance negatively. Adding a column with the following

问题 Hey Im new to functional programming and learning haskell. I'm wondering whether will i be able to split elements in a list and grouping them in two's. I already saw the splitAt operations and it only splits at specified index value/ position splitAt 3 [1,2,3,4,5] -> [1,2,3][4,5] Now I'm wondering say I have a list where random characters [A,S,D,F,G,H,J,K,U,Y,R,E,W,V,B,N] , I want to split this as [A,S][D,F][G,H][J,K].... and so on .. I' m totally stuck up in this ! Please help me out ! 回答1: