FireDAC.Phys.MongoDBWrapper.TMongoReadPreference.TReadMode
Delphi
TReadMode = (Primary, Secondary, PrimaryPreferred, SecondaryPreferred, Nearest);
C++
enum class DECLSPEC_DENUM TReadMode : unsigned int { Primary, Secondary, PrimaryPreferred, SecondaryPreferred, Nearest };
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
| enum | public | FireDAC.Phys.MongoDBWrapper.pas FireDAC.Phys.MongoDBWrapper.hpp |
FireDAC.Phys.MongoDBWrapper | TMongoReadPreference |
Description
Defines an enumeration used to specify the read preference modes.
The values of TReadMode specify the read preference modes.
This enumeration defines the following values:
Primary: Default mode. All operations read from the current replica set primary.PrimaryPreferred: In this mode, operations read from the primary. If it is unavailable, operations read from the secondary members of the replica set.Secondary: In this mode, all operations read from the secondary members of the replica set.SecondaryPreferred: In this mode, operations read from the secondary members but if no secondary members are available, operations read from the primary.Nearest: In this mode, operations read from a member of the replica set with the least network latency, irrespective of the members type.