tableau-server | 易学教程

Finding the distinct count from a cassandra column using Tableau

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问题 I am a beginner in Tableau. I have successfully connected Tableau with Cassandra. I am facing an issue now. I am trying to get the distinct count (unique) value from a given column.. The database which I have is like 17 million. (Cassandra DB) I even tried count (Distinct) as shown above. But it is not working as expected. Can anyone help me out with this? Thanks in advance. 来源： https://stackoverflow.com/questions/32889949/finding-the-distinct-count-from-a-cassandra-column-using-tableau

How to display image from http request to external API with Node.js

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问题 I have a situation where in order to get images for a site that I am building, I need to make a http request to an external server for information. Currently, the responses from the requests come in two forms, XML and images. I am doing this using Node.js. For the XML, I'm able to parse it without issues and it can be passed into a variable and handled like everything else. With the images, I'm stuck, I have no idea how to get them "displayed" on the page after making the request for them.

How to load large table into tableau for data visualization?

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问题 I am able to connect tableau with my database but the table size is really large here. Everytime I try to load the table into tableau, it is crashing and I am not able to find any work around. The table size varies from 10 million - 400 million rows. How should I approach this issue any suggestion ? 回答1: I found a simple solution for optimising Tableau to work with very large datasets (1 billion+ rows): Google BigQuery, which is essentially a managed data warehouse. Upload data to BigQuery

Tableau Linux server, does it not recognize the user ODBC settings

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问题 Connecting data source via ODBC driver to the tableau server seem to not work at a user level. I have odbc.ini and obdcinst.ini files on the user home directory. $ODBCINI and $ODBCINSTINI Environment variables are set pointing to respective files.Tableau still fail to pick the data source. Workbook published from the desktop is rendered only on placing the odbc.ini and odbcinst.ini into /etc/ or tableau user directory ( /var/opt/tableau/tableau_server/ ). Although it fixes the issue, there

Disable tableau custom view / remember my changes

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问题 I want to disable the "Remember my changes " or the custom views options on a tableau view. I know it can be disabled by using ":CustomViews=n" parameter on the URL. But i want to disable it from server level. If possible, i would also want to disable it for certain users only. 回答1: It is not currently possible to disable custom views in Tableau Server. As a workaround, site administrators and other authorized users can allow or deny the permission 'Share Customized' which allows saved

After upgrading Tableau to 9.2, I am unable to publish workbooks in the Tableau Server (9.1)?

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问题 Has anyone experienced this? It is very frustrating as I have spent several hours preparing workbooks in the upgraded 9.2 version. I try to publish to the 9.1 Tableau Server, but it will not allow it. Looks like I may have to spend several more hours recreating the dashboard on 9.0 again (9.0 is compatible with the Tableau Server we have, but 9.2 is not). Can someone please help :( Thank you, P 回答1: Here's a little hack that works. Unpack/unzip the .twbx file if you have a .twbx file, to get

How to load large table into tableau for data visualization?

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I am able to connect tableau with my database but the table size is really large here. Everytime I try to load the table into tableau, it is crashing and I am not able to find any work around. The table size varies from 10 million - 400 million rows. How should I approach this issue any suggestion ? I found a simple solution for optimising Tableau to work with very large datasets (1 billion+ rows): Google BigQuery, which is essentially a managed data warehouse. Upload data to BigQuery (you can append multiple files into a single table). Link that table to Tableau as an external data source