Oracle stream not working as Logminer is down

Question

Hi,
Oracle streams capture process is not capturing any updates made on table for which capture & apply process are configured.
Capture process & apply process are running fine showing enabled as status & no error. But, No new records are captured in ‘streams_queue_table’ when I update record in table, which is configured for capturing changes.
This setup was working till I got ‘ORA-01341: LogMiner out-of-memory’ error in alert.log file. I guess logminer is not capturing the updates from redo log.
Current Alert log is showing following lines for logminer init process
LOGMINER: Parameters summary for session# = 1
LOGMINER: Number of processes = 3, Transaction Chunk Size = 1
LOGMINER: Memory Size = 10M, Checkpoint interval = 10M
But same log was like this before
LOGMINER: Parameters summary for session# = 1
LOGMINER: Number of processes = 3, Transaction Chunk Size = 1
LOGMINER: Memory Size = 10M, Checkpoint interval = 10M
LOGMINER: session# = 1, reader process P002 started with pid=18 OS id=5812
LOGMINER: session# = 1, builder process P003 started with pid=36 OS id=3304
LOGMINER: session# = 1, preparer process P004 started with pid=37 OS id=1496We can clearly see reader, builder & preparer process are not starting after I got Out of memory exception in log miner.
To allocate more space to logminer, I tried to setup tablespace to logminer I got 2 exception which was contradicting each other error.
SQL> exec DBMS_LOGMNR.END_LOGMNR();
BEGIN DBMS_LOGMNR.END_LOGMNR(); END;
*ERROR at line 1:
ORA-01307: no LogMiner session is currently activeORA-06512: at "SYS.DBMS_LOGMNR", line 76
ORA-06512: at line 1
SQL> EXECUTE DBMS_LOGMNR_D.SET_TABLESPACE('logmnrts');
BEGIN DBMS_LOGMNR_D.SET_TABLESPACE('logmnrts'); END;
*ERROR at line 1:
ORA-01356: active logminer sessions foundORA-06512: at "SYS.DBMS_LOGMNR_D", line 232
ORA-06512: at line 1
When I tried stopping logminer exception was ‘no logminer session is active’, But when I tried to setup tablespace exception was ‘active logminer sessions found’. I am not sure how to resolve this issue.
Please let me know how to resolve this issue.
Thanks
siva

Answer 1

The Logminer session associated with a capture process is a special kind of session which is called a "persistent session". You will not be able to stop it using DBMS_LOGMNR. This package controls only non-persistent sessions.
To stop the persistent LogMiner session you must stop the capture process.
However, I think your problem is more related to a lack of RAM space instead of tablespace (i. e, disk) space. Try to increase the size of the SGA allocated to LogMiner, by setting capture parameter SGASIZE. I can see you are using the default of 10M, which may be not enough for your case. Of course, you will have to increase the values of init parameters streams_pool_size, sga_target/sga_max_size accordingly, to avoid other memory problems.
To set the SGASIZE parameter, use the PL/SQL procedure DBMS_CAPTURE_ADM.SET_PARAMETER. The example below would set it to 100Megs:
begin
DBMS_CAPTURE_ADM.set_parameter('<name of capture process','_SGA_SIZE','100');
end;
I hope this helps.
Ilidio.