Checkpoint Not Complete

/u01/app/oracle/oradata/redo04.log
Thu Jan 14 22:12:55 2011
Thread 1 cannot allocate new log, sequence 46352
Checkpoint not complete

To Solve this Issue you Can Do More Than One Thing But All of the Solution is Simple :

Solution One :

Modify Database Parameter archive_lag_target Like This :

alter system set archive_lag_target=0 scope=both;

Solution two :

1-backup Full Database
2-Check Free Disk Space
3-Start Do the Following :

SELECT a.group#, a.member, b.bytes FROM v$logfile a, v$log b WHERE a.group# = b.group#;

select group#, status from v$log;

Now You need to Work Step by Step On Inactive Logs , and Stat Drop Them like the following :

alter database drop logfile group 1;

Re add the Log File

alter database add logfile group 1 ( ‘/Log-Name01.log‘,‘/Log-Name02.log’ ) size 75M

alter system switch logfile; / Alter System Checkpoint

 Do this For The Group that you have , and rearrange them again By Adding new Group contain more than one redo log inside them

Simple !!!

Enjoy
Osama Mustafa