I have such problem.
On my test 11.2 DB I switched on Standart Oracle Audit:
I have test user TESTAUD with "GRANT CREATE TABLE TO TESTAUD;"
Then I issued from user SYS:
SQL> audit create table;
And from user TESTAUD:
SQL> create table .....bla bla bla;
Then I looked into view DBA_COMMON_AUDIT_TRAIL. It was nothiing except actions 100 (LOGIN), 101 (LOGOFF) about user TESTAUD.
As it's test DB, I reboot it again. Looked into DBA_COMMON_AUDIT_TRAIL, and what a mirracle - there was 1row with statement_type=CREATE TABLE!!!
Then I repeat my experiment.
From user TESTAUD I created new table. Then wait 10minutes. No more rows in DBA_COMMON_AUDIT_TRAIL. I reboot DB. And looked in view. And there were 2 rows with "CREATE TABLE"!!!
it looks like the auditing took place but the xml file may not have been immediately flushed to disk,
something that would then happen after a reboot as you observed, when the audit file is not
yet flushed other sessions checking DBA_COMMON_AUDIT_TRAIL (which for the XML part
will dynamically list the files in the audit_file_dest) will not see it.
If you want audit info to be flushed to the XML files immediately, issue:
ALTER SYSTEM SET
EVENT='46349 trace name context forever, level 1'
COMMENT='re-enable flush of audit files' SCOPE=SPFILE;
Reference: note 1358183.1 Audit Files Are Not Immediately Flushed To Disk
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