Why my SQLite3 query takes time?
Let’s learn why my SQLite3 query takes time. The most accurate or helpful solution is served by Stack Overflow.
There are ten answers to this question.
Best solution
I have a sqlite3 DB table of around 250 000 rows, my code is written in python. I need to filter it in very specific wat, and it takes much too long time. Table is as follows: self.cur.execute("""create table DetectedVehicles(IdD INTEGER PRIMARY KEY, CLCode INT, DetectionTime INT, PlateNo VARCHAR)""") It's a table for automatic plate number recognition result filtering. And I need to filter it to get (native sql-like statements :) ): Get rows from table DetectedVehicles...
Answer:
Try: select distinct x.* from DetectedVehicles x join DetectedVehicles y on x.PlateNo = y.PlateNo and...
Intelligent-Infrastructure at Stack Overflow Mark as irrelevant Undo
Other solutions
So here's some more detail behind this question... I have two systems from two different vendors, both proprietary. We'll call them System A and System B. Both systems function as stand alone entities, but System B provides some additional and very specific...
Answer:
Yes, that will not work right. What you need to do is to use the PHP UrlEncode function to encode all...
Manuel Lemos at Quora Mark as irrelevant Undo
I am running a query on a linux server running on oracle 10g on a server which has 8 CPU Intel(R) Xeon(R) CPU E5420 @ 2.50GHz and current 'top' shows me: top - 10:03:40 up 2 days, 16:05, 6 users, load average: 12.69, 12.13, 11.46 Tasks: 291 total, 1...
Answer:
10 minutes is too long for users to wait. The best practice is less than 3 minutes. Here are some suggestion...
Chenfang at Yahoo! Answers Mark as irrelevant Undo
Here is the scenario: I've got a MySQL table "posts" with 1.5mm rows. To select a set of 50 and order by creation timestamp can take up to 3 seconds because MySQL has to analyze some 300k rows first. I've found a good solution for the main...
Answer:
First: try to normalize the database. Database normalization is very important when you reach certain...
Angel Rojas at Quora Mark as irrelevant Undo
I am using MySQL database. When I execute a query which the main table(20 thousands of rows) is joined with the other 5 tables, it takes 90 seconds to return me the result. I then added indices into each of the criteria(where clause). Then the execution...
Answer:
Optimizing MySQL queries is a fairly straightforward process. To solve your problem would require a...
Juan Cristián Vera Huneeus at Quora Mark as irrelevant Undo
We are currently building a personalized commerce site. Since our site aims to provide personalized recommendations, we have built a simple, yet effective, scoring engine which can score items based on user's input. Once a user feeds in 'some input'...
Answer:
Disclaimer - I started learning ML last semester & have worked of couple of projects here &...
Rushabh Mehta at Quora Mark as irrelevant Undo
Here's a query letter I've done. I'd love some feedback on it: Being haunted is annoying, especially for high school senior Emma Harris. As if showing up at Emma’s volleyball game and shopping trip wasn’t bad enough, the ghost takes things to the next...
Answer:
It sounds interesting, but not something I would read because I don't read historical. It also confusing...
tkdgirl_2010 at Yahoo! Answers Mark as irrelevant Undo
I use a macbook and every time I search something in google, the first time once I press enter it takes 2-3 seconds to process and then blanks out. It erases my query and leaves me with no results. I then have to re-type it and press enter again and...
Answer:
maybe ur browser using any proxy server...or its routing to any other spam websites.... do one thing...
Christian Knoble at Yahoo! Answers Mark as irrelevant Undo
I connected Excel to ODBC SQL Server Database and Excel pivot table is getting its data from an SQL server VIEW. There are a total of about 1 million rows from the QUERY. From the data, I created new columns in excel to perform calculations. Every time...
Answer:
Can you move the calculations to the server? Most PivotTable operations represent a "Group By"...
Randy Zwitch at Quora Mark as irrelevant Undo
QUESTION: Dear astronomer, NASA has measured the exact timing when the earth would be closest to the sun, or farthest away from the sun. NASA's calculations on this regard assigned Jan 4, and on July 4 to be the time when earth would be closest and farthest...
Answer:
Hello, I am very glad to have been able to help you, Mazin. However, I still beg to differ that using...
Miningco.com Mark as irrelevant Undo
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