Refer to figure.
EASA learning objective 022.11.02.02.01 states: 'Explain the purpose of, and describe the typical content of, the aircraft performance database.'

The flight management computer (FMC) of a flight management system (FMS) contains 2 different types of database:

Navigation Database - contains all the information that would previously been published on paper charts and approach plates, such as :

• Airports
• SIDs
• STARs
• Waypoints
• Approaches
• Runways
• Company Routes

The information contained in the navigation database is valid for 28 days, the nexts months database is stored in the flight management computer and is selectable by the pilots, it's validity must be checked before getting airborne.

Performance Database - contains performance information for the specific airframe and engine type that the FMC is fitted to, such as:

• Engine performance
• Aerodynamic performance
• Optimum speeds and limits
• Aircraft drag characteristcs

The Flight Management Computer (FMC) uses the information stored in the performance database to continuously calculate required engine thrust settings and fuel usage for each stage of flight:

• Take off - FMC calculates thrust targets and safety speeds for runway length, mass and power available.
• Climb - calculates climb thrust based on ambient conditions and most efficient climb speed.
• Cruise - calculates fuel flow at cruise thrust and determines optimum altitude and cruise speed
• Descent - plans an idle thrust descent path to minimise fuel burn
• Landing and Go around - calculates apropriate aproach thrust and go around thrust settings taking into account spool up time and engine limits.

to validate GNSS position and satellite data --> INCORRECT. The performance database contains no data that can be used for checking the validuity of GNSS data.

for LNAV calculations --> INCORRECT. LNAV calculaions are based on data supplied by the navigation database.

to calculate engine thrust settings --> CORRECT. The performance database contains all the engine performance data from which thrust settings are derived.

to calculate IRS positions --> INCORRECT. The performance database contains no navigational data.