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The Teradata Python Module has been certified to work with Python 3. Though these modules can be accessed directly, its recommended to use the base UdaExec module instead as it provides all the extra DevOps enabled features.
Example 1 - HelloWorld. We tell UdaExec the name and version of our application during initialization so that we can get feedback about our application in DBQL and Teradata Viewpoint as this information is included in the QueryBand of all Database sessions created by our script.
We also tell UdaExec not to log to the console e. Below is the result: We also see quite a bit of information was added to the QueryBand of the session we created. We can see the application name and version we specified when initializing UdaExec as well as the name of a log file.
If we look at this location on the file system we can see the log file that was generated: Not Found'] Initializing run number to 1 In the logs, you can see connection information and all the SQL statements submitted along with their durations.
If any errors had occurred, those would have been logged too.
Explicitly closing resources when done is always a good idea. These features help simplify development and provide the feedback developers need once their applications are put into QA and production. What if we now wanted to run our HelloWorld.
We would need to modify the source of our script, which is somewhat inconvenient and error prone. Luckily the UdaExec framework makes it easy to maintain configuration information outside of our source code. Example 2 — PrintTableRows.
In this example, we make a connection to a data source whose name and configuration is defined outside of our script. Example 2 - udaexec. The TDPROD data source is defined in our configuration file and provides the name of the system we are connecting to as well as the username and password.
When not specified as method arguments, these values are looked up in the external configuration.
This is true for almost all configuration parameters that can be passed to the UdaExec constructor so that any setting can be set or changed without changing your code. Found'] As you can see, UdaExec is attempting to load external configuration from multiple files. By default, UdaExec looks for a system specific configuration file, a user specific configuration file, and an application specific configuration file.
The location of these files can be specified as arguments to the UdaExec constructor.
Below are the argument names along with their default values. Table 1 — Config File Locations Name.In this paper we present a simple and efficient method, called ARIES (Algorithm for Recouery and Isolation Exploiting Semantics), which supports partial rollbacks of transactions, finegranularity (e.g., record) locking and recovery using write-ahead logging (WAL).
Oct 23, · TPC-A stressed logging even more than TPC-C does. You had to do write ahead logging (WAL) to be competitive.
Anyone who didn’t already have WAL implemented it. With write ahead logging in effect, durability is achieved. You can see the drawback though, now we have returned to tediously writing to disk for each change as it occurs. And, especially for a database with high transaction rates, that can be a through-put bottleneck.
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Aug 08, · A Write-Ahead Log protocol is used so that a dirty page is not forced to non-volatile storage until a log record of the modification is created and written to non-volatile storage. Replica updating does not delay the committing of transactions because replica updating is done asynchronously with respect to transaction processing.