In reference to a datum:
- the fact that its value that cannot be broken down into smaller
+ the fact that its value cannot be broken down into smaller
components.
integrity constraints.
Transactions may be allowed to violate some of the constraints
transiently before it commits, but if such violations are not resolved
- by the time it commits, such transaction is automatically
+ by the time it commits, such a transaction is automatically
rolled back.
This is one of the
ACID properties.
Grant
- An
SQL command that is used to allow
- users or
+ An
SQL command that is used to allow
a
+ user or
role to access
specific objects within the database.
A relation that is
- defined in the same way that a a view
+ defined in the same way that a view
is, but stores data in the same way that a
table does. It cannot be
modified via INSERT, UPDATE, or
In reference to a window function:
- a partition is a user-defined criteria that identifies which neighboring
+ a partition is a user-defined criterion that identifies which neighboring
rows can be considered by the
function.
The system catalog resides in the schema pg_catalog.
These tables contain data in internal representation and are
not typically considered useful for user examination;
- a number of user-friendlier views
- also in schema pg_catalog offer more convenient access to
+ a number of user-friendlier views,
+ also in schema pg_catalog, offer more convenient access to
some of that information, while additional tables and views
exist in schema information_schema
(see ) that expose some
each page stores two bits: the first one
(all-visible) indicates that all tuples
in the page are visible to all transactions. The second one
- (all-frozen) indicate that all tuples
+ (all-frozen) indicates that all tuples
in the page are marked frozen.
A process that saves copies of WAL files
- for the purposes of creating backups or keeping
+ for the purpose of creating backups or keeping
replicas current.
and are written in sequential order, interspersing changes
as they occur in multiple simultaneous sessions.
If the system crashes, the files are read in order, and each of the
- changes is replayed to restore the system to the state as it was
+ changes is replayed to restore the system to the state it was in
before the crash.