tex capacity exceeded

[Bernhard Kleine]

I have a book with 16 included chapters which gives about 800 pages. the
error is not due a special file but is random when I choose different
chapters to compile. Therefore I want to increase the texcapacity in
tex.conf as I used to do it some years ago. While the old tex.conf files
were deleted when new texlive distribution came forward, I no longer
know how to proceed. Looking for "texlive tex.conf" didnot reveal a
single straightforward entry while googling. Thats why I ask here. Where
is the manual to make a tex.conf file?