How to find redo generated per each SQL Statement?

Database version is 10.2.0.4. OS is AIX.
We have excessive redo generation during specific time of a day. We would like to identify which statement is contributing to this excessive redo.
ADDM shows this as first finding
Waits on event "log file sync" while performing COMMIT and ROLLBACK operations were consuming significant database time.
Is it possible to find out which sql statement is generating how much redo in bytes during a specific time?
Thank You
Sarayu

user11181920 wrote:
Is it possible to find out which sql statement is generating how much redo in bytes during a specific time?It will not help you.
For example, you will see bunch of UPDATE,DELETE,INSERT statements issued by apps. So? What you going to do with them? If you can modify the app to eliminate unnecessary DMLs - it would be great of course. But it is unlikely.From what I've seen, namely developers putting way more commits in than the business rules would justify, it is not so unlikely.
>
Also when DML statements generate Redo, the do not cause too many waits of "log file sync", because buffer Log writer flushes buffer as soon as it fills more than 30% or after some time, or on Commit/Rollback. This may or may not be true, as there can be several reasons for log file sync: insufficient I/O (which is the only one you are addressing); CPU starvation (because the cpu ultimately controls i/o requests, and even fixing some unrelated sql that hogs the cpu could change this); lgwr priority (on some systems it makes sense to simply raise the priority, it can vary widely as to whether this makes sense); and other things like private redo, file option flags and the IMU relationships with undo that can be too complicated to put in a partial sentence.
>
Waits on event "log file sync" while performing COMMIT and ROLLBACK operations were consuming significant database time.So the root cause can be too many commits, which you should evaluate and fix if possible. You can also use Tanel Poder's snapper script, including on lgwr to see more closely what it is waiting on. See page 28: http://files.e2sn.com/slides/Tanel_Poder_log_file_sync.pdf
>
Right. It is because Log Writer writes here synchronously, reliably, it waits until HDD writes data down and responds its written OK.
And HDDs are not the fastest things in computer. They are mechanical - that is why.
I would recommend you :
1. Place redo log files on fast HDDs that used preferably dedicated for this purpose only. If other I/O will frequently disturb these drives they will cause heads change tracks which causes longest HDD waits.
2. Consider to use faster technology like SAN or SSD.Read this instant classic: http://www.pythian.com/news/28797/de-confusing-ssd-for-oracle-databases/

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     O /* This is a child who makes N references to each of the follow N parent tables (here: three), and so on. */
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using (owner)
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My thanks in advance,
Philips
Edited by: BluShadow on 01-Apr-2011 15:08
formatted the code and the hierarchy for readbility

Justin,
Understood.
Nocycle not work in 9.2 and, even that would work, would not be appropriate.
With your help, I decided a much simpler way (but there is still a small problem, <font color=red>IN RED</font>):
-- 1
declare
type udt_roles is table of varchar2(30) index by pls_integer;
cRoles udt_roles;
begin
execute immediate 'create user philips
    identified by philips';
select granted_role bulk collect
    into cRoles
    from user_role_privs
   where username = user;
for i in cRoles.first .. cRoles.count loop
    execute immediate 'grant ' || cRoles(i) || ' to philips';
end loop;
end;
-- 2
create table philips.root1(root1_id number,
                           constraint root1_id_pk primary key(root1_id)
                           enable);
grant all on philips.root1 to philips;
create or replace trigger philips.tgr_root1
   before delete or insert or update on philips.root1
   begin
     null;
   end;
create table philips.root2(root2_id number,
                           constraint root2_id_pk primary key(root2_id)
                           enable);
grant all on philips.root2 to philips;
create or replace trigger philips.tgr_root2
   before delete or insert or update on philips.root2
   begin
     null;
   end;
create table philips.node1(node1_id number,
                           root1_id number,
                           node2_id number,
                           node4_id number,
                           constraint node1_id_pk primary key(node1_id)
                           enable,
                           constraint n1_r1_id_fk foreign key(root1_id)
                           references philips.root1(root1_id) enable,
                           constraint n1_n2_id_fk foreign key(node2_id)
                           references philips.node2(node2_id) enable,
                           constraint n1_n4_id_fk foreign key(node4_id)
                           references philips.node4(node4_id) enable);
grant all on philips.node1 to philips;
create or replace trigger philips.tgr_node1
   before delete or insert or update on philips.node1
   begin
     null;
   end;
create table philips.node2(node2_id number,
                           root1_id number,
                           node3_id number,
                           constraint node2_id_pk primary key(node2_id)
                           enable,
                           constraint n2_r1_id_fk foreign key(root1_id)
                           references philips.root1(root1_id) enable,
                           constraint n2_n3_id_fk foreign key(node3_id)
                           references philips.node3(node3_id) enable);
grant all on philips.node2 to philips;
create or replace trigger philips.tgr_node2
   before delete or insert or update on philips.node2
   begin
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create table philips.node3(node3_id number,
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                           constraint node3_id_pk primary key(node3_id)
                           enable,
                           constraint n3_r2_id_fk foreign key(root2_id)
                           references philips.root2(root2_id) enable);
grant all on philips.node3 to philips;
create or replace trigger philips.tgr_node3
   before delete or insert or update on philips.node3
   begin
     null;
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create table philips.node4(node4_id number,
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                           constraint n4_n2_id_fk foreign key(node2_id)
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grant all on philips.node4 to philips;
create or replace trigger philips.tgr_node4
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   begin
     null;
   end;
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create table philips.node5(node5_id number,
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                           enable);
grant all on philips.node5 to philips;
create or replace trigger philips.tgr_node5
   before delete or insert or update on philips.node5
   begin
     null;
   end;
-- 3
create table philips.dictionary(table_name varchar2(30));
insert into philips.dictionary values ('ROOT1');
insert into philips.dictionary values ('ROOT2');
insert into philips.dictionary values ('NODE1');
insert into philips.dictionary values ('NODE2');
insert into philips.dictionary values ('NODE3');
insert into philips.dictionary values ('NODE4');
insert into philips.dictionary values ('NODE5');
--4
create or replace package body philips.pck_restore_philips as
procedure sp_select_tables is
    aExportTablesPhilips     utl_file.file_type := null; -- file to write DDL of tables
    aExportReferencesPhilips utl_file.file_type := null; -- file to write DDL of references
    aExportIndexesPhilips    utl_file.file_type := null; -- file to write DDL of indexes
    aExportGrantsPhilips     utl_file.file_type := null; -- file to write DDL of grants
    aExportTriggersPhilips   utl_file.file_type := null; -- file to write DDL of triggers
    sDirectory               varchar2(100) := '/app/oracle/admin/tace/utlfile'; -- directory \\bmduhom01or02
    cTables                  udt_tables; -- collection to store table names for the relational depth
begin
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    sp_seeks_ddl(aExportTablesPhilips,
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end sp_select_tables;
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                         aExportIndexesPhilips    in utl_file.file_type,
                         aExportGrantsPhilips     in utl_file.file_type,
                         aExportTriggersPhilips   in utl_file.file_type,
                         cTables                  in out nocopy udt_tables) is
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    sTableName varchar(30) := null;
begin
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          null;
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        cDDL := dbms_metadata.get_dependent_ddl('REF_CONSTRAINT', sTableName, 'PHILIPS');
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          null;
      end;
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        cDDL := dbms_metadata.get_dependent_ddl('INDEX', sTableName, 'PHILIPS');
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      end loop;
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begin
-- executes main procedure:
sp_select_tables;
end pck_restore_philips;<font color="red">The problem is that I still have ...
When creating the primary key index is created and this is repeated in the file indexes.
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{color:#808080}{color:#333300}Hi,
Please find answer to your question below:{color}
Venkat: Procedure executing successfully. Procedure loaded 1 to 4 records after that not loaded 5,6 and 7 records. How do we specify for record inserts 7. actually 7 th record is valid statement we should be insert this record. Please tell me how do we handle sql statements each and every one successfully or not.
{color}
{color:#0000ff}Guna: The procedure hits an exception after 4th record, and does not process anymore as it exits out of the procedure, I believe the data is not committed as well. You need handle exceptions if the processing has to continue. Same is the belwo case as well
{color}{color:#333300}Regards,
Guna{color}

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How to find Disk I/O and VM stat numbers

Hello Experts,
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hi sonu,
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ardhian
http://sapbasis.wordpress.com

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