Apex, version, on a is working fine for some time.

Then, while clicking the ‘application builder’ home-page, we got the ‘page not found’-error in the browser.

Logging of Apache shows:

mod_plsql: /pls/apex_schd/f HTTP-404 ORA-03113: end-of-file on communication channel\n
mod_plsql: Unable to reset state for mode 0: Err 3114 url=>/pls/apex_schd/f

Restarted the http-server and webcache: no result.
Configured the same apex on another application server, pointing to the same database: no result.

Allright, database alert-file shows:
ORA-07445: exception encountered: core dump [opidsa()+386] [SIGSEGV] [Address not mapped to object] [0x000000000] [] []

There were no changes (really, there weren’t…) in the past few days.

Points out to be a bug in (with any version of Apex): bugnr 5745817 :

“Implementing regular flushes of the shared pool can prevent the problem from occurring.
The problem is fixed in 11g via non-published bug:5648872 and the fix is included in” (note 418531.1)
The patch is also available: 5648872

For the time being, ‘alter system flush shared_pool’ is fine for me, until we upgrade to (or 11gr2 of course… :-)  ).