I accidentally overwrote a saved project query in BQ with a completely unrelated query. I can't find any documentation about retrieving overwritten queries or about any sort of version control. Has anyone done this as well and recovered their query?
Unfortunately, "Saved Query" is UI internal feature (see How to access “Saved Queries” programmatically? and there is respective feature request REST API for Saved Queries), so we really have no way to manage / control this cases
Meantime you can use query history (either in UI or via respective API or in Stackdriver) to locate use of that query and recreate/re-save it again
Related
I have a few questions about Tableau and how dynamic it is:
Changes to the data in a relational db requires refresh, no events of refresh or something else?
Can we have visualizations at a runtime, e.g if we have some filters and we select some of them are the visualizations going to be updated?
If I have some API and want it to accept some params from the users and pass them to Tableau for querying, this would be a use case.
Tabeau queries your data source directly. Changes in your source are visible whenever Tableau launches a query.
There is no "in memory" database to be refreshed, but there are high performance extracts that can function as a buffer between your data source & Tableau, sometimes approaching in memory performance.
A "new" query to get fresh data is sent when:
Something changes, for example the user filters a view (see question 2 :-) )
The workbook or dashboard is opened
The refresh button is hit
Another periodic refresh is launched
A programmatic event triggers a refresh
It is possible to launch a reload of the extract or a new query based on a trigger. You could create a command line script on the server that is triggered by your source system to reload (using TABCMD - Tableau command line interface or TabPy - Tableau Python integration amongst other thing). Or you could use the API.
Yes, the visualizations will be updated each time you select a filter.
This behavior is very customizable, you have a lot of control on what filter refreshes what viz, even in the front end only.
EDITED for clarity
I have a split database and I have duplicated front-end file to make multiple copies for different users. Every-time a change is made on one front-end form, I want the other forms in other front-ends to always drop changes. How can I trap this write conflict to always drop changes maybe through VBA if possible?
Not quite sure what you mean by "drop changes" - the frontend should never be redesigned during normal use.
You must distribute a new copy of the frontend to the users.
A smooth and proven method using a shortcut and a script is described in my article:
Deploy and update a Microsoft Access application with one click
(If you don't have an account, browse for the link: Read the full article)
Edit:
If it is the data that is updated by several users, and you update via VBA, you may study another of my articles:
Handle concurrent update conflicts in Access silently
Though simple to use, the code is a bit too much to post here. It is also on GitHub:
VBA.ConcurrencyUpdates
I have appended the versioning bundle in midway of my project after having written most of my raven queries in my data access layer. Now because of versioning i have lots of replicated data. Whenever i query a type of document i can see the values replicated as many times as the document is versioned. Is there way to stop querying the re-visioned documents when i query for the current data in common without re-writing all of my queries with Exclude("Revisions").Is there any setting where i can say query on re-visioned document =False which i can set globally? please suggest something to overcome this..
That is the way it works, actually. It appears that you have disabled the versionning bundle, which would cause this to happen.
I am trying to view my sagas in the RavenDB management studio, and loading even the initial page, all that I see is this "Querying documents..." box with a continuous moving progress bar. I can not seem to get past it, going from page to page it does not go away. Is there a way to pull all of the saga data into a list so I can look at it? It appears the issue is that the saga documents are continuously being added.
I've looked into the HTTP API and the Linq adapters, but I guess I am looking for something that already exists that can easily peer into the server much like the silverlight studio, except not such a pain. I more or less just want to pull a snapshot of all the documents into some kind of readable list.
I find LINQPad 4 convenient, the RavenDB driver for LINQPad can be found here:
https://github.com/ronnieoverby/RavenDB-Linqpad-Driver
For the command line - cURL using dynamic indexes as explained here:
http://ravendb.net/docs/http-api/indexes/dynamic-indexes
In the browser, go to http://localhost:8080/docs
You might need to install JsonView, but that should give you what you want.
If anyone wants to know how to browse the data through REST call,
"localhost:8080/databases/{database-name}/docs/{dataset-name}/id"
example:
"localhost:8080/databases/testDB/docs/Sites/1"
will give the json data for the "Sites" document
"localhost:8080/databases/testDB/docs/"
will give the json data for all the documents in
testDB.
I need a simple tool to visualize the status of a series of processes (ETL processes, but that shouldn't matter). This process monitor need to be customizable with color coding for different status codes. The plan is to place the monitor on a big screen in the office making any faults instantly visible to everyone.
Today I can check the status of these processes by running an sql statement against the underlying tables in our oracle database. The output of these queries are the abovementioned status codes for each process. I'm imagining using these sql statements, run periodically (say, every minute or so), as an input to this monitor.
I've considered writing a simple web interface for doing this, but I'm thinking something like this should exist out there already. Anyone have any suggestions?
If just displaying on one workstation another option is SQL Developer Custom Reports. You would still have to fire up SQL Developer and start the report, but the custom reports have a setting so they can be refreshed at a specified interval (5-120 seconds). Depending on the 'richness' of the output you want you can either:
Create a simple Table report (style = Table)
Paste in one of the queries you already use as a starting point.
Create a PL/SQL Block that outputs HTML via DBMS_OUTPUT.PUT_LINE statements (Style = plsql-dbms_output)
Get creative as you like with formatting, colors, etc using HTML tags in the output. I have used this to create bar graphs to show progress of v$Long_Operations. A full description and screen shots are available here Creating a User Defined HTML Report
in SQL Developer.
If you just want to get some output moving you can forego SQL Developer, schedule a process to use your PL/SQL block to write HTML output to a file, and use a browser to display your generated output on your big screen. Alternately make the file available via a web server so others in your office can bring it up. Periodically regnerate the file and make sure to add a refresh meta tag to the page so browsers will periodically reload.
Oracle Application Express is probably the best tool for this.
I would say roll your own dashboard. Depends on your skillset, but I'd do a basic web app in Java (spring or some mvc framework, I'm not a web developer but I know enough to create a basic functional dashboard). Since you already know the SQL needed, it shouldn't be difficult to put together and you can modify as needed in future. Just keep it simple I would say (don't need a middleware or single sign-on or fancy views/charts).