Hi araza,
At 3.5, it’s still limited to a 32-bit space (so 2^32 worth).
From 3.6, it’s 64-bit, see https://code.kx.com/q/releases/ChangesIn3.6/#nucs-not-upwardly-compatible
Curious what you’re doing with the sym file though?
Large sym files in HDBs generally reload and write-down times, so it’s generally not a good idea, eventually leading to a need for sym file compaction: https://code.kx.com/q/kb/compacting-hdb-sym/
Cheers,
Sean