Help me. Will be the Trigger below cause performance problem?

Experts,

I'm Mohanasundar, senior Software engineer, Antares limited systems. We use oracle for our product. 16 years one of our capture of audit trail table (* LOGTABLE *) do not have a primary key column. If we write at the same time more than one journal to LOGTABLE, the column was even, due to which order of this column wasn't properly.

To avoid this, we have added the trigger of bellows for LOGTABLE.

CREATE OR REPLACE TRIGGER TR_PK_ATTACH_TBL+.
BEFORE INSERT ON ATTACH_TABLE FOR EACH LINE.
DECLARE A1 NUMBER +
START to+.
* SELECT LOGTABLE_SEQ. NEXTVAL IN A1 FROM DUAL; *
*: NEW.LT_INDEX: = A1; *
END; +

LT_INDEX Here are the newly added primary key column.
LOGTABLE_SEQ is an oracle sequence.

This table contains about 10 million documents.
Initially we updated the sequence for the LT_INDEX column to existing records.

Details of our server:

OS: windows Server2008 R2
Web server: Apache Tomcat 6.35
Oracle: 11G

The problem is,

"* We made this change to the production for the last version (this month)." "Our teams COMPUTER, reports that after this change, the site is too slow (Server Web is in place, but the answer is too slow)."

Will this trigger slow the performance of oracle db? *

Please help us, our eight month project is literally dependent on this key.

Thank you
Mohanasundar.n

Relaxation itself I do not introduce overhead costs have a significant impact on performance, and I can see why you would use an approach to relaxation based during the redevelopment of this on an existing system.
Could really do with some stats here, an AWR report on a busy to begin with.

But I'll take a guess - could be contention on the right-hand side of the index, a hot block as all these inserts are consecutive values are inserted.
A reverse key index could (maybe with the emphasis on the word!) help here.

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