Extremely slow synchronization of index of the substring

Oracle on RedHat Linux x 64 11.2.0.2 (5,7)

I created a partitioned CONTEXT index in a NOPOPULATE State.  The index is defined on a column of a table partitioned using an attribute NULL_FILTER and SUBSTRING CLOB.  I then used the following procedure to fill the files queued for indexing.

BEGIN

CTX_DDL. () POPULATE_PENDING

idx_name = > "CONTENT_VALUE_IDX"

part_name = > 'P_2012_12 '.

);

END;

/

This procedure seems to work for an appropriate period of time, but ended up with the following error:

ORA-20000: Oracle text error:

DRG-50857: error Oracle in drvddl. ProcessOnlinePending

ORA-20000: Oracle text error:

DRG-50857: error Oracle in textindexmethods. ODCIIndexDelete

ORA-20000: Oracle text error:

DRG-10607: index meta data are not ready yet for the DML queues

DRG-50857: error Oracle in drdmlpo

ORA-20000: Oracle text error:

DRG-10502: 1766 index does not exist

ORA-06512: at "CTXSYS. DRUE", line 160

ORA-06512: at "CTXSYS. DRVXMD', line 42

ORA-06512: at line 1

ORA-30576: dictionary of the context error loading Option

ORA-06512: at "CTXSYS. DRUE", line 160

ORA-06512: at "CTXSYS. CTX_DDL', line 1366

ORA-06512: at line 2

However, the number of records that have been entered in the DR$ PENDING corresponded with the same number of records in the table that is to be built on this index.  So, I hope that this error can be ignored?

I then try to sync the lines on hold with the following text:

BEGIN

CTX_OUTPUT. START_LOG ('content_value.log');

END;

/

BEGIN

CTX_DDL. () SYNC_INDEX

idx_name = > "CONTENT_VALUE_IDX"

memory = > "2000 M",

part_name = > "P_2012_12"

parallel_degree = > 16

);

END;

/

The process begins in parallel 16 and logs show the documents being indexed.  After about an hour or two, the paper then shows "Writing data index ($I) to the database." and then appears to process the data of the substring that the log shows "Substring writing data ($P) to the database."  This is the point that the parallel process begins to go to series.  Restraint begins to show in the data base.  Blocking the session indicates an expectation of 'db file sequential read' event and the sessions that begin to queue have a wait state of ' enq: TX - line lock conflict.

$P TEXT table support is being filled and lines are deleted from the DR$ waiting for the table, then the process does work.  The partition which was being indexed has only 27 lines, however the process lasted a few WEEKS before I finally killed the process.

There is a note on Metalink (parallel and series SYNC_INDEX text is slow when SUBSTRING_INDEX is enabled (Doc ID 840097.1)) which seems to solve this same scenario, but says that the problem should be solved in 11.2.0.2.

Another sync non-text substring index with no problems.  The 'Oracle Text' option is valid in the data base and none of the CTXSYS objects are DISABLED.

Someone at - it ideas?

So, as you guessed correctly, the fundamental problem is that 16 parallel workers try to write to the table in the face of the claim and the substring by.

Our solution has been to change the parameter MAXTIME sync_index something very short - a half hour - so that the amount of data to write was a little smaller and the claim was broken up more quickly.

We did originally because we wanted more insight in the newspapers and the pace of progress in the indexing, but after testing with multiple values MAXTIME, we found that 30 minutes gave us the best overall in terms of indexed documents throughput / hour.

Your values will likely change, but with a bit of journaling, you should be able to find a practice, if a solution is not optimal.

Tags: Database

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