I research the Irish Family History Foundation's database. It contains 12,000,000 surviving rcds for abt 65% of Irish counties. Rcds are increasingly sparse B4 1840, rare B4 1800.
Note 1 - Without a KNOWN parish, the chance of an ancestor's rcds NOT being in this database is AT LEAST 35%.
Note 2 - Only 1/2 of Co. Cork's rcds are in this database.
Note 3 - The RC church kept control over most parish rcds from Tipperary (north). These are ONLY available thru the Tipperary Family History Research center at a substantial fee (regardless of outcome).
For John Fogarty B 1824 (exact) somewhere in Ireland with the father's forename unknown, I found 3 rcds: 1-Kilkenny and 2-Limerick. Nothing in Tipperary. Note 2 may apply here. Also, at this early date, the rcd may not have survived.
For John Fogarty M 1846 +/- 4 yrs somewhere in Ireland, I found 7 rcds: 1842 Tipperary, 1842 Kilkenny, 2-1843 Kilkenny, 1844 Tipperary, 1845 Tipperary, and 1848 Tipperary.
For Mary Doyle M ditto, I found 111 rcds - too many to summarize here. Those in common with John's are 1842 KIL, 1843 KIL, and 1848 TIP. However, when I screened at the parish level, I didn't get a match.
For John Fogarty B 1847 +/- 4 yrs somewhere in Ireland with the father forenamed John, I found 7 rcds: 2-1843 LIM, 1844 LIM, 1845 TIP, 1846 DUB, 1847 WIK, and 1850 KIL.
Google the Foundation's name to lead you to this database. Register, opt to be notified as rcds are added and browse. Pls post your search results to my genforum msg.