Problem with a massive delete operation

Hello

This matter is v10g Oracle.

An array is used to store user login information and other connection related details such as IP address, the date of connection, connection time, time of disconnection etc from a web application.

This table gets big enough (3 million documents +) and is purged once per month of all records of 3 days.

The purge is made with a simple deletion based on the date of connection CDAT and column DISX (logout = True/False)

DELETE FROM LOGTAB where CDAT < sysdate-3 and DISX='T';

CDAT and DISX columns are indexed. This delete operation can tale up to 10 minutes.

Sporadic during the delete operation when problems users to connect or disconnect: for users trying to disconnect, operation UPDATE, resulting on the table currently being deleted seems to hang.

For users trying to connect, there may be a delay (as the INSERT is pending). In the worst cases, all sessions hang until the button DELETE finally committed thus making impossible any connection for the duration.

There is no conflict between the data being deleted and the data are updated or INSERTED.

DELETION should only lock the rows that match the WHERE clause, so where is the claim arising out of? This could be the index argument?
Is there a better way to manage these massive cuts on these high transaction tables? Partitions?

Thank you in advance.

Have you thought about this table partitioning? Of course, this would depend on whether most queries are watching the columns you mention, but that would mean that you can truncate partitions over 3 days...

create table LOGTAB
(   cdat        date not null,
    disx        varchar2(1) not null,
    col1        varchar2(100)
)
PARTITION BY RANGE (cdat)
SUBPARTITION BY LIST (disx)
SUBPARTITION TEMPLATE
    (   SUBPARTITION sptn_T VALUES('T'),
        SUBPARTITION sptn_Default VALUES(DEFAULT)
    )
(   PARTITION ptn_20110808 VALUES LESS THAN (TO_DATE('09/08/2011','dd/mm/yyyy')),
    PARTITION ptn_20110809 VALUES LESS THAN (TO_DATE('10/08/2011','dd/mm/yyyy')),
    PARTITION ptn_20110810 VALUES LESS THAN (TO_DATE('11/08/2011','dd/mm/yyyy')),
    PARTITION ptn_20110811 VALUES LESS THAN (TO_DATE('12/08/2011','dd/mm/yyyy')),
    PARTITION ptn_MaxValue VALUES LESS THAN (MAXVALUE)
)

insert
into
    LOGTAB
SELECT
    TO_DATE('08/08/2011','dd/mm/yyyy'),
    CASE
        WHEN mod(rownum,2)=0 THEN
            'T'
        ELSE
            'S'
    END,
    'Blah'
FROM
    dual
CONNECT BY
    LEVEL <= 10
/
insert
into
    LOGTAB
SELECT
    TO_DATE('09/08/2011','dd/mm/yyyy'),
    CASE
        WHEN mod(rownum,2)=0 THEN
            'T'
        ELSE
            'S'
    END,
    'Blah'
FROM
    dual
CONNECT BY
    LEVEL <= 10
/
insert
into
    LOGTAB
SELECT
    TO_DATE('10/08/2011','dd/mm/yyyy'),
    CASE
        WHEN mod(rownum,2)=0 THEN
            'T'
        ELSE
            'S'
    END,
    'Blah'
FROM
    dual
CONNECT BY
    LEVEL <= 10
/
insert
into
    LOGTAB
SELECT
    TO_DATE('11/08/2011','dd/mm/yyyy'),
    CASE
        WHEN mod(rownum,2)=0 THEN
            'T'
        ELSE
            'S'
    END,
    'Blah'
FROM
    dual
CONNECT BY
    LEVEL <= 10
/  

SQL> select * from logtab where cdat=to_date('08/08/2011','dd/mm/yyyy');

CDAT      D COL1
--------- - ----------
08-AUG-11 T Blah
08-AUG-11 T Blah
08-AUG-11 T Blah
08-AUG-11 T Blah
08-AUG-11 T Blah
08-AUG-11 S Blah
08-AUG-11 S Blah
08-AUG-11 S Blah
08-AUG-11 S Blah
08-AUG-11 S Blah

SQL> select table_name,partition_name,subpartition_name from user_tab_subpartitions;

TABLE_NAME                     PARTITION_NAME                 SUBPARTITION_NAME
------------------------------ ------------------------------ ------------------------------
LOGTAB                         PTN_20110808                   PTN_20110808_SPTN_DEFAULT
LOGTAB                         PTN_20110808                   PTN_20110808_SPTN_T
LOGTAB                         PTN_20110809                   PTN_20110809_SPTN_DEFAULT
LOGTAB                         PTN_20110809                   PTN_20110809_SPTN_T
LOGTAB                         PTN_20110810                   PTN_20110810_SPTN_DEFAULT
LOGTAB                         PTN_20110810                   PTN_20110810_SPTN_T
LOGTAB                         PTN_20110811                   PTN_20110811_SPTN_DEFAULT
LOGTAB                         PTN_20110811                   PTN_20110811_SPTN_T
LOGTAB                         PTN_MAXVALUE                   PTN_MAXVALUE_SPTN_DEFAULT
LOGTAB                         PTN_MAXVALUE                   PTN_MAXVALUE_SPTN_T

10 rows selected.

SQL> alter table logtab truncate subpartition PTN_20110808_SPTN_T;

Table truncated.

Elapsed: 00:00:00.03
SQL> select * from logtab where cdat=to_date('08/08/2011','dd/mm/yyyy');

CDAT      D COL1
--------- - ----------
08-AUG-11 S Blah
08-AUG-11 S Blah
08-AUG-11 S Blah
08-AUG-11 S Blah
08-AUG-11 S Blah

Elapsed: 00:00:00.00

Don't know if it is suitable for you or not, but it could be an option...

HTH

David

Tags: Database

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http://www.theeldergeekvista.com/vista_clean_installation.htm

A tutorial on the use of a clean install

http://www.winsupersite.com/showcase/winvista_install_03.asp

Super Guide Windows Vista Installation

After installation > go to the website of the manufacturer of your computer/notebook > drivers and downloads Section > key in your model number > get latest Vista drivers for it > download/install them.

Save all data, because it will be lost during a clean installation.

See you soon.

Mick Murphy - Microsoft partner

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