This ensures that the log difference between the primary and standby database instances is controlled within the period specified by hadr_recovery_point_target during the switchover and the standby database instance can be promoted to primary. If this parameter is set to a small value, the ...
There is no difference between a primary key and any other candidate key. It's not really useful to make assumptions about keys based only on a list of attribute names. You need to know what dependencies are supposed to hold between the attributes. Having said that, my guess is that you ...
The problem with this implementation, as I see it, is it does not let the user override this value by setting readonly_fields to () because we wouldn't be able to tell the difference between the default value and an override. Another option would be to include 'pk' in the default ...
By using CBO, the database calculates the number of tuples and the execution cost for each step under each execution plan based on the number of table tuples, column width, null record ratio, and characteristic values, such as distinct, MCV, and HB values, and certain cost calculation meth...
It keeps track of teams in the league, coaches and players on th What is the difference between a database Field and a database Record? If a M:N relationship is mandatory on one side and optional on the other side and if both relatio...
Generally, when we are in front-end and back-end joint debugging, we have to look at the field type on the interface document, and TypeScript will automatically help us identify the current type. It saves us time to look at the document or network . This is called type inference (we ...
P.S. the question isn't a duplicate ofthat onein any way, because here I'm asking aboutthe casesin which namedtuple is better, not aboutthe difference(I've checked docs and sources before asking) It depends on your needs. Each of them has own benefits. ...
(c) hyperlink. (d) foreign key. Database: This is a tabular representation of the data. This makes accessing data easy. A number of tools can be used to manage it. The tools are using their own programming language ...
By using CBO, the database calculates the number of tuples and the execution cost for each step under each execution plan based on the number of table tuples, column width, null record ratio, and characteristic values, such as distinct, MCV, and HB values, and certain cost calculation meth...