logo
down
shadow

Django database planning - time series data


Django database planning - time series data

By : user2952906
Date : November 19 2020, 03:59 PM
it fixes the issue One thing that may help you with HUGE tables is partitioning. Judging by the postgresql tag that you set for your question, take a look here: http://www.postgresql.org/docs/9.1/static/ddl-partitioning.html
But for a start I would go with a one, simple table, supported by a reasonable set of indexes. From what I understand, each data entry in the table will be identified by race session id, player id and time indicator. Those columns should be covered with indexes according to your querying requirements.
code :
class RaceTelemetryData(models.Model):
  user = models.ForeignKey(..., index_db=True)
  race = models.ForeignKey(YourRaceModel, index_db=True)
  time = models.IntegerField()
  gas = models.IntegerField()
  speed = models.SmallIntegerField()
  # and so on...


Share : facebook icon twitter icon
Optaplanner : Planning entity and Planning variable at the same time?

Optaplanner : Planning entity and Planning variable at the same time?


By : Алексей Юманов
Date : March 29 2020, 07:55 AM
may help you . The TSP and Vehicle Routing example already have planning values that are planning entities too, although they both use a chained=true variable. Because chained=true, it implies that no 2 planning entities have the same planning variable (and all are directly or indirectly connected to an anchor). See docs section "chained planning variables".
I suspect in your case, that you don't want chains, but instead a tree, a directed graph or an undirected graph. An undirected graph (= a graph which allows cycles) is problematic for Construction Heuristics, because out-of-the-box they can't construct a graph with a cycle. As for a tree and a directed graph: it should work in theory, but you might need custom moves (see docs) to have the moves be efficient. In the future, we'd like to support a tree structure similarly to how we support chains (for job shop scheduling).
Time series database with time-weighted-average aggregation function for irregular time series?

Time series database with time-weighted-average aggregation function for irregular time series?


By : Yash Verma
Date : March 29 2020, 07:55 AM
it should still fix some issue OpenTSDB performs aggregation across all series in a query at the time(s) implied by the query. For any series not having a data value at a timestamp, it linearly interpolates a value from the values before and after. It does this "upsampling" at query time -- the original data is always stored as it was when it arrived. You can perform a trailing windowed time average, but not an exponentially weighted moving average (I believe that is what you meant by time-weighted?)
http://opentsdb.net/docs/build/html/user_guide/query/aggregators.html
How to add visualisation for time planning (What Django package to reuse)?

How to add visualisation for time planning (What Django package to reuse)?


By : Kaylee
Date : March 29 2020, 07:55 AM
will help you Since I got no answers I will answer my own question . The decision was to try to integrate with some of the existing tools without directly embedding then into our project. First, one we are looking at Trello/taiga-back
Is exist this type of database? (like time-series db, can get specific time point data...)

Is exist this type of database? (like time-series db, can get specific time point data...)


By : Omar Fernando Gonzal
Date : March 29 2020, 07:55 AM
will be helpful for those in need You are looking for the last status for each user before a given point in time. In SQL Server, you can use window functions:
code :
select count(*)
from (select t.*,
             row_number() over (partition by user_key order by updated_date desc) as seqnum
      from t
      where updated_date < @datetime
     ) t
where seqnum = 1 and status = 1;
Django Database Structure for Time Series Data?

Django Database Structure for Time Series Data?


By : user3414639
Date : March 29 2020, 07:55 AM
With these it helps The standard approach here would be to use Django models (translated to tables in the db):
Buoy BuoyData
code :
from django.contrib.gis.db import models


class Buoy(models.Model):
    """
    Represents a Buoy
    """
    location = models.PointField()
    name = models.CharField(max_length=200, null=True, blank=True)


class BuoyData(models.Model):
    """
    Represents a single Buoy datapoint
    """
    buoy = models.ForeignKey(Buoy, related_name='data')
    date = models.DateTimeField()
    # swell size in feet
    swell_size_ft = models.DecimalField(decimal_places=2, max_digits=5)
from django_pandas.io import read_frame

buoy = Buoy.objects.get(id=10)
data_queryset = buoy.data.all()
df = read_frame(data_queryset)

# or another example
import datetime
from django.utils import timezone
from django.contrib.gis.geos import Point

lat = 36.123
lng = -121.123
# notice how lng is x, lat is y
location = Point(lng, lat)

time_four_days_ago = timezone.now() - datetime.timedelta(days=4)

closest_buoy = Buoy.objects.distance(location).order_by('distance')[0]
data_queryset = buoy.data.filter(date__gte=time_four_days_ago)

# if there are a lot of fields on your BuoyData model,
# and you only need a few, .values will be more performant
data_values = data_queryset.values('date', 'swell_size_ft')
df = read_frame(data_values)
Related Posts Related Posts :
  • Remove commas in a string, surrounded by a comma and double quotes / Python
  • How to chain Django querysets preserving individual order
  • Comparison with Python
  • How to find backlinks in a website with python
  • Return new instance of subclass when using methods inherited from parent class in Python
  • Which function in django.contrib.auth creates the default model permissions?
  • Formatting text in tabular form with Python
  • How to determine the first day of a month in Python
  • Error while converting date to timestamp in python
  • Python string iterations
  • Is there any file number limitation when you select multiple files with wxFileDialog?
  • Errors with Matplotlib when making an executable with Py2exe (Python)
  • Django Haystack - Indexing single field
  • Go Pro Hero 3 - Streaming video over wifi
  • Appending a column in .csv with Python/Pandas
  • How to change my result directory in Robot framework using RIDE?
  • problem with using pandas to manipulate a big text file in python
  • python-magic module' object has no attribute 'open'
  • Where goes wrong for this High Pass Filter in Python?
  • Why inserting keys in order into a python dict is faster than doint it unordered
  • flann index saving in python
  • Create new instance of list or dictionary without class
  • How can I easily convert FORTRAN code to Python code (real code, not wrappers)
  • Address of lambda function in python
  • Python adding space between characters in string. Most efficient way
  • python http server, multiple simultaneous requests
  • Disguising username & password on distributed python scripts
  • Post GraphQL mutation with Python Requests
  • Why doesnt pandas create an excel file?
  • Rolling comparison between a value and a past window, with percentile/quantile
  • How to avoid repetitive code when defining a new type in python with signature verification
  • How to configure uWSGI in order to debug with pdb (--honour-stdin configuration issue)
  • In Python, how do you execute objects that are functions from a list?
  • Python- Variable Won't Subtract?
  • Processing Power In Python
  • Python 2.7.2 - Cannot import name _random or random from sys
  • Why doesn't the Python sorted function take keyword order instead of reverse?
  • Make a function redirect to other functions depending on a variable
  • get_absolute_url in django-categories
  • Monitoring non-Celery background task with New Relic in Python
  • Feature selection with LinearSVC
  • LSTM - Predicting the same constant values after a while
  • Test the length of elements in a list
  • Django: render radiobutton with 3 columns, cost column must change according to size & quantity selected
  • Python class attributes vs global variable
  • sys.stdout.writelines("hello") and sys.stdout.write("hello")
  • is ndarray faster than recarray access?
  • Python - search through directory trees, rename certain files
  • GAE: How to build a query where a string begins with a value
  • TypeError: __init__() takes at least 2 arguments (1 given)
  • Overriding and customizing "django.contrib.auth.views.login"
  • Django : Redirect to a particular page after login
  • Python search and copy files in directory
  • pretty printing numpy ndarrays using unicode characters
  • Frequent pattern mining in Python
  • How can I make a set of functions that can be used synchronously as well as asynchronously?
  • Convert one dice roll to two dice roll
  • count occourrence in a list
  • Writing an If condition to filter out the first word
  • to read file and compare column in python
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org