JOURNAL_PG_SZ
pgSz = JOURNAL_PG_SZ(journal_format);
pPager->nRec*JOURNAL_PG_SZ(journal_format);
pPager->nRec*JOURNAL_PG_SZ(journal_format)+JOURNAL_HDR_SZ(journal_format) );
pPager->ckptJSize = pPager->nRec*JOURNAL_PG_SZ(journal_format)
nRec = (szJ - JOURNAL_HDR_SZ(3))/JOURNAL_PG_SZ(3);
nRec = (szJ - JOURNAL_HDR_SZ(2))/JOURNAL_PG_SZ(2);
assert( nRec*JOURNAL_PG_SZ(2)+JOURNAL_HDR_SZ(2)==szJ );
nRec = (szJ - pPager->ckptJSize)/JOURNAL_PG_SZ(journal_format);