Dropping the Hight Water Mark on a Queue table.

What is the best technique for dropping the High Water Mark on a queue table?
Will the dbms_aqadm.purge_queue_table procedure drop the high water mark (truncate the queue table) when purging all records from the queue?
If not, is it supported to manually truncate the queue table? My guess is that this is ok if the queue is empty.
Please advise on best strategies for maintaing performance of the queue following a period where the queue fills with a large number of transactions pushing the high water mark up.

http://docs.oracle.com/cd/E12844_01/doc/bip.1013/e12187/T421739T481157.htm#4535349

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Hi I am trying to drop the user which has got some queue tables. When I drop the user it is giving me
SQL> drop user O2AQ_ADMIN cascade;
drop user O2AQ_ADMIN cascade
ERROR at line 1:
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ORA-24005: must use DBMS_AQADM.DROP_QUEUE_TABLE to drop queue tables
I read about in and learned that we need to use DBMS_AQADM.DROP_QUEUE_TABLE to drop the queue tables. So i queried the dba_queue_tables view to findout the name of the queue table, but it gave me this result.
SQL> SELECT queue_table FROM DBA_QUEUE_TABLES WHERE owner ='O2AQ_ADMIN';
no rows selected
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Thanks

If you have already partially dropped a user owning Q's some manual cleanup may be required, have a look at the below note on My Oracle Support:
How to Manually Cleanup Advanced Queuing Tables (Doc ID 203225.1)
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Why high water mark?

Hi,
These days I am always thinkin' about a question that why Oracle introduces high water mark.
I've found some documents describing this concept, but I still can't make out what's the advantage of the high water mark.
If someone could tell me, I will be very appreciated!

Jaffy wrote:
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:669044239081
regards
Jaffythanks Jaffy, I think I can accept this answer, maybe Oracle takes FTS from HWM as a safe way.
The same thanx to Pavan Kumar and Aman....
----quote from http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:669044239081:
The blocks are in use. The table is a complex data structure, it is not a fifo/lifo queue or
anything like that -- it is a big old heap. Once used -- implies "could still be used".
Edited by: user12977032 on May 14, 2010 12:54 AM

High water mark

what is high water mark iin oracle all about. secondly what type of PL/SQL is describe dbms_start

High Water Mark is all about knowing what table storage is used and what table storage is free. Blocks stored below the high water mark may be full, but if not they should be considered for use when inserting or updating records. On the other hand, blocks below the high water mark also need to be inspected during a full-table-scan query whether they are empty or not.
DESCRIBE is not PL/SQL. It is a SQLPlus command used to show the API of a table or a procedure. Described [sic] in the SQLPlus reference manual at http://tahiti.oracle.com

High water mark creates performance degradation

Hi all,
I need help...
How to find High water mark for tables. How to decide what are all tables needs to be reorginised. I want clear cut idea on this issue.
Please help me.
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You use online segment shrink to reclaim fragmented free space below the high water mark in an Oracle Database segment. The benefits of segment shrink are these:
Compaction of data leads to better cache utilization, which in turn leads to better online transaction processing (OLTP) performance.
The compacted data requires fewer blocks to be scanned in full table scans, which in turns leads to better decision support system (DSS) performance.
Please visit here:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/schema.htm#ADMIN10161
what were the objects and recommendations generated after Segment Advisor job execution?
SQL> select af.task_name, ao.attr2 segname, ao.attr3 partition, ao.type, af.message
from dba_advisor_findings af, dba_advisor_objects ao
where ao.task_id = af.task_id
and ao.object_id = af.object_id
what are the objects my database that can be reduced?
select tablespace_name, segment_name, segment_type, partition_name,
recommendations, c1 from table(dbms_space.asa_recommendations('FALSE', 'FALSE', 'FALSE'));
where c1 is the command to be used.Before such operations this has to be issued,
ALTER TABLE ... ENABLE ROW MOVEMENT.
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How to drop the multi columns?????

how to drop the multi columns in oracle
Like
alter table drop column a,b;
is it possible.

how to drop the multi columns in oracle
Like
alter table drop column a,b;
is it possible.Yes, it is possible.
RTFM:
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Best practices in Queue table maintenance

Hi Fellow AQ Users,
I am looking to hear from the community about best practices in queue table maintenance.
I have been mining through metalink about various Oracle recommendations and putting
together a set of recommendations as a starting point for my DBAs.
I am looking to answer questions like these --
How often (in relation to messaging load) would you coalesce and rebuild the indexes?
How often would you rebuild the table itself to get rid of the high water mark issues ?
and what procedure would you use to do that?
Would really love to learn from your experiences in this area. We are using 9.2.0.7
64 bit DB and have plans to go to 10g over the next year. So, I am looking at 9i related
stuff and then 10g.
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Hello,
In general you coalesce once per day ideally during a quiet time to avoid ORA-54 errors as per <Note:271855.1>. Some customers do it more often than that but once per day is a good starting point.
In terms of shrinking the queue tables you can use the procedure in <Note:304522.1> with a null 3rd parameter. This is an offline procedure so you could only run it during a maintenance window. In 10.2 onwards you can dynamically shrink the queue table and IOTS. Again it depends on exactly what you are doing with your queue tables how often you might need to do this.
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Finding the number of blocks occupied by a table

Hi,
I need to know how much space is being occupied by a table.
NOTE: I dont need the allocated space of a table. I need the actual space occupied by a table currently.
I have used the following two methods to determine the size, but i have two contradictory answers..
The procedure i have used is:
1. calculate the number of blocks being used.
2. mulitply the number of blocks by db_block_size to get
the space occupied by a table.
I have used two ways to find out the number of blocks, but they both differ.
Let me know which one is correct or is there any way to find out the number of blocks.
1st Method
SQL> analyze table employee estimate statistics;
Table analyzed.
SQL> select table_name, blocks, empty_blocks from dba_tables where table_name='EMPLOYEE';
TABLE_NAME BLOCKS EMPTY_BLOCKS
EMPLOYEE 184999 5000
2nd method to find the number of blocks.
SQL> select count(distinct(substr(dbms_rowid.rowid_to_Restricted(rowid,0),1,8))) from employee;
COUNT(DISTINCT(SUBSTR(DBMS_ROWID.ROWID_TO_RESTRICTED(ROWID,0),1,8)))
165058
From the 1st method i got 184999 as the number of blocks and from 2nd method i got 165058.
Please help me out as soon as possible.
Thanks........

If by "the number of blocks occupied by a table" you mean the number of blocks actually containing data, then the best you can do is an approximation. The supplied package DBMS_SPACE contains a procedure called Unused_Space that will give you the number of blocks above the high water mark. It takes 3 input paramters and returns 7 out parameters. You can call it as:
DBMS_SPACE.Unused_Space (owner, obj_name, object_type,
                         total_blocks, total_bytes, unused_blocks,
                         unused_bytes, last_used_extent_file_id,
                         last_used_extent_block_id, last_used_block)The output parameters are:
total_blocks - Number of blocks allocated to the table
total_bytes - Number of bytes allocated to the table
unused_blocks - Number of blocks above the high water mark
unused_bytes - Number of bytes above the high water mark
last_used_extent_file_id - file id containing the last used block
last_used_extent_block_id - block id of the last used block
last_used_block - row slot of the last used block
Note that this does not take into account any free space within block below the high water mark.
HTH
John

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Hi I'm trying to create a Queue table. For that I'm creating a new Object, and then a table type of the same Object and then a Queue table of the payload type of the created table type, for which I'm getting an error. I'm using the following list of Queries:
create or replace type CRM_TO_UMS_USR_DATA_TAB as object
PROVISION_ID varchar2(25)
PROVISION_DATE date
ERROR_CODE varchar2(20)
ERROR_MSG varchar2(50)
STATUS char
COMMENTS varchar2(50)
Result => no Error
create or replace type CRM_TO_UMS_USR_DATA_TYP as TABLE of CRM_TO_UMS_USR_DATA_TAB
Result => no Error
begin
dbms_aqadm.create_queue_table(queue_table => 'CRM_TO_UMS_DATA_QUE_TAB',queue_payload_type => 'CRM_TO_UMS_USR_DATA_TAB');
end;
Result =>
Error report:
ORA-00902: invalid datatype
ORA-06512: at "SYS.DBMS_AQADM_SYS", line 2830
ORA-06512: at "SYS.DBMS_AQADM", line 58
ORA-06512: at line 2
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Grant aq_administrator_role to siebel;
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GRANT RESOURCE TO siebel;
GRANT CONNECT TO siebel;
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GRANT aq_administrator_role TO siebel;
GRANT aq_user_role TO siebel;
GRANT EXECUTE ON dbms_aqadm TO siebel;
GRANT EXECUTE ON dbms_aqin TO siebel;
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The type CRM_TO_UMS_USR_DATA_TAB is invalid because the syntax you're using is incorrect:
SQL> create or replace type CRM_TO_UMS_USR_DATA_TAB as object
2 (
3 PROVISION_ID varchar2(25)
4 PROVISION_DATE date
5 ERROR_CODE varchar2(20)
6 ERROR_MSG varchar2(50)
7 STATUS char
8 COMMENTS varchar2(50)
9 );
10 /
Warning: Type created with compilation errors.
SQL> begin
2 dbms_aqadm.create_queue_table(queue_table => 'CRM_TO_UMS_DATA_QUE_TAB',queue_payload_type => 'CRM_TO_UMS_USR_DATA_TAB');
3 end;
4 /
begin
ERROR at line 1:
ORA-00902: invalid datatype
ORA-06512: at "SYS.DBMS_AQADM_SYS", line 2822
ORA-06512: at "SYS.DBMS_AQADM", line 58
ORA-06512: at line 2
SQL> create or replace type CRM_TO_UMS_USR_DATA_TAB as object
2 (
3 PROVISION_ID varchar2(25),
4 PROVISION_DATE date ,
5 ERROR_CODE varchar2(20),
6 ERROR_MSG varchar2(50),
7 STATUS char(1),
8 COMMENTS varchar2(50)
9 );
10 /
Type created.
SQL> begin
2 dbms_aqadm.create_queue_table(queue_table => 'CRM_TO_UMS_DATA_QUE_TAB',queue_payload_type => 'CRM_TO_UMS_USR_DATA_TAB');
3 end;
4 /
PL/SQL procedure successfully completed.Max
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Internal Error ORA-0600 when creating multiple consumer queue table

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Dropping the Hight Water Mark on a Queue table.

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