Question about how Oracle manages the Redo logs
HelloAssuming a configuration which consists of 2 redo log groups (groups A and B), each group of 2 disks (disks A1 and A2 for Group A) and B1 and B2 disks for Group B. Additionally, assume that each redo log file resides by itself in a disk storage device and that the device is dedicated to her. So in the situation described above, there are 4 discs, one for each redo log file, and each disc contains nothing other than a redo log file. Also, assume that the database is in ARCHIVELOG mode and the files from archive is stored on another different set of devices.
kind of graphically:
GROUP A GROUP B
A1 B1
A2 B2
The question is: when the disks that make up the Group A are filled and Oracle switches to the disks in the Group B, can the group drives to take offline, perhaps even physically removed from the system if necessary without affecting the functioning of the database? Can the archiver process temporarily delayed until the disks (which have been removed) are presented online or is the DBA have to wait until the end of the process to archive a copy of the redo log file creating in archive?Thank you for your help,
John.
Hello
A journal of the groups fall
To remove a group of online redo logs, you must have the ALTER DATABASE system privilege. Before you delete a line redo log group, consider the following precautions and restrictions:
* An instance requires at least two groups of files logging online, regardless of the number of members in the groups. (A group is one or more members.)
* You can delete a group of newspapers online redo only if it is inactive. If you need to drop the current group, first force a log switch occurs.
* Make sure a group of online redo logs is archived (if archiving is enabled) before dropping. To see if this happens, use the view LOG V$.
SELECT GROUP #, ARCHIVED, STATUS FROM V$ LOG;
GROUP # ARC STATUS
--------- --- ----------------
1 ACTIVE YES
2. NO CURRENT
3 INACTIVE YES
4 INACTIVE YES
Delete a group of newspapers online redo with the SQL ALTER DATABASE statement with the DROP LOGFILE clause.
The following statement drops redo log group number 3:
ALTER DATABASE, DROP LOGFILE GROUP 3;
When a group of online redo logs is deleted from the database, and you do not use Oracle managed files, operating system files are not removed from the disk. Instead, control of the associated database files are updated to remove members of the Group of the database structure. After deleting a group of online redo logs, make sure the drop completed successfully and then use the command of operating system appropriate to delete the dropped online redo log files.
When you work with files managed by Oracle, the cleaning of operating system files is done automatically for you.
Your database will not be affected as you can work with 2 files, redo log in each group, as the minimum number of redo log in a database file is two because the process LGWR (newspaper writer) writes in the redo log in a circular way. If the process crashes because you have 2 groups only if you want to remove 1 Add a third and make that the current group and remove the one you want to be offline.
Please refer to:
http://download.Oracle.com/docs/CD/B10500_01/server.920/a96521/onlineredo.htm#7438
Kind regards
Mohamed
Oracle DBA
Tags: Database
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question about how to combine the two scripts.
HelloI have a sql script that can display a table (or view) all the information, it works fine. I call it validate_table.sql, as below:
command prompt
accept invites owner "Enter table owner:
accept invites from TABLE_NAME "Enter object (table/View...) "name:"
column owner format a10 column 'owner '.
column format a30 topic 'Object name' object_name
column object_type format a15 direction "Type of object".
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in the heading of column created format a20 "created."
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object_name
object_type
status
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command prompt
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status
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order of cons_type;I have another script that allows to display the newly created tables (table, table names) in the last 24 hours.
SET SERVEROUTPUT ON;
DECLARE
CURSOR tmp_cur IS
SELECT master, object_name
FROM dba_objects
WHERE object_type in ('TABLE', 'SEE') and the owner not in ('SYS', 'SYSTEM', 'GENERAL', "XDB", "OUTLN", "SYSMAN") and last_ddl_time > sysdate - 1;
tmp_rec tmp_cur % ROWTYPE;
BEGIN
FOR tmp_rec IN tmp_cur LOOP
DBMS_OUTPUT. PUT_LINE)
tmp_rec. Owner | ' ' || tmp_rec.object_name);
END LOOP;
END;
/
The gap of the first script (validate_table.sql) is that it can only check table one by one by manual entry, then how can I combine these two scripts, to make a scipt that can check all newly created tables (not a table) in the last 24 hours?
I thank very you much in advance!
Hello
If you already know how to find the owner and all the tables created table_name recently. One thing you can do is to change all the WHERE clauses in validate_table.sql, so instead of things like
where object_name = upper ('& table_name') and owner = upper('&owner');
you say
WHERE (owner, object_name) IN
(
SELECT master, object_name
FROM dba_objects
WHERE object_type in ('TABLE', 'SEE')
AND owner NOT IN ('SYS', 'SYSTEM', 'GENERAL', "XDB", "OUTLN", "SYSMAN")
AND last_ddl_time > SYSDATE - 1
)
;
Here is another approach:
Validate_table. SQL is quite handy as it is. You may want to run this script for tables, even when you know that they are not new. Divide into 2 scripts: one called ask_and_describe_table.sql, which looks like this:
-Ask_and_Describe_Table.sql
accept invites owner "Enter table owner:
accept invites from TABLE_NAME "Enter object (table/View...) "name:"
-You can use any name path instead of d:\some_dir below:
@d:\some_dir\describe_table & owner, table_name
and the other one called Describe_Table.sql, which starts like this:
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DEFINE owner = & 1
DEFINE table_name = & 2
column owner format a10 column 'owner '.
...
and continues with the same exact content as validate_table.sql.
Now, to write another script (I'll call it Describe_Recent_Tables.sql):
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SET ECHO OFF
SET FEEDBACK OFF
SET PAGESIZE 0
VERRIFY OFF SET
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COIL d:\some_dir\describe_many_tables.sql
SELECT ' @d:\some_dir\describe_table '
|| owner
|| ' '
|| object_name
FROM dba_objects
WHERE object_type in ('TABLE', 'SEE')
AND owner NOT IN ('SYS', 'SYSTEM', 'GENERAL', "XDB", "OUTLN", "SYSMAN")
AND last_ddl_time > SYSDATE - 1;
SPOOL OFF
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SET VERRIFY ON
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@d:\some_dir\describe_many_tables
I guess that all of your tables have standard names (for example, start with a letter, no spaces in the name,...), which don't require quotation marks. If they could, then the same basic approach will work, but the details are a little messier.
When you want to see the information on a single table or view, no matter how old it is, driven
Ask_and_Describe_Table
or, if you do not need to question the owner of the table and the name, something like
Describe_Table SCOTT EMP
(You can find that you really need not Ask_and_Describe_Table.sql).
When you want to do this for all the tables created in the last 24 hours:
Describe_Recent_Tables
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Published by: 440bx - 11 GR 2 on Aug 14, 2010 08:01 - plural for questions1)
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John
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importance of the size of the Redo Log
Hi guys,.
What is the importance of the size of the size of Redlog?
whether large or small size?
Thanks in advance
REDA
What is the importance of the size of the size of Redlog?
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Question about the size of the redo log buffer
Hello
I am a student in Oracle and the book I use says that having a bigger than the buffer log by default, the size is a bad idea.
It sets out the reasons for this are:
>
The problem is that when a statement COMMIT is issued, part of the batch validation means to write the contents of the buffer log for redo log to disk files. This entry occurs in real time, and if it is in progress, the session that issued the VALIDATION will be suspended.
>
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Published by: 440bx - 11 GR 2 on August 1st, 2010 09:05 - edited for formatting of the citationA commit evacuates everything that in the buffer redolog for redo log files.
A redo log buffer contains the modified data.
But this is not just commit who empty the redolog buffer to restore the log files.
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Hi all
How do I know the delay in the redo log apply on Active Dataguard 11 g...
Do we need to wait until the log switch occurs?
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Please suggest...
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OS: RHEL 5.4
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Published by: user1687821 on February 23, 2012 12:02apply for time of arrival + 00 00:00:00.0 day (2) to second (1) interval February 23, 2012 03:02:16
Here apply finish time is 'Zéro' if there are gaps in log files, this parameter shows the time it will take to resolve the discrepancy.
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SQL >! date
Thu Feb 23 03:03:34 CST 2012If you see your date system current and last does the end is not even a second. So probably there is no delay I would say.
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bottleneck during the passage of the redo log files.
Hi all
I'm using Oracle 11.2.0.3.
The enforcement team has indicated that they are facing slow at some point.
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I have 2 son since my database is CARS, each thread has 3 groups of multiplexed redo logs the FIU, with size of 300 MB each.
Is it possible to optimize the switch of the redo log files? knowing that my database is running in ARCHIVELOG mode.
Kind regardsHello
Yes, Oracle recommends 1 validation by 30 calls from users or less. Of course, every database is different, so this rule cannot be taken too literally, but in your case, this rule seems to apply. In any case State, 900 undertakes seconds it looks like a very large number and the need for a high number of transactions should be questioned. You should talk to your analysts/application management/enterprise architect if warranted - that is to say if the application does in fact almost 2 000 business transactions per second.
What about DB CPU: here is a link to a blog that I wrote on this subject, it should help to better understand this number:
http://Savvinov.com/2012/04/06/AWR-reports-interpreting-CPU-usage/
But briefly: DB processor isn't a real event, it is simply an indication that the sessions are on CPU (or waiting for CPU) rather than wait on i/o requests or events in the database. It is not necessarily a bad thing, because the database must perform tasks and he cannot do without loading the CPU. It may indicate a problem in two cases: when the CPU usage is close to the limit of the host (OS stats section indicates that you are very far from there) or when the CPU is a % of DB time - in the latter case, this could mean that you are making too many logical reads due to inefficient plans or analysis too. In any case, this does not apply to you, because 20 percent is not very high a number.
Other items in the list of the top 5 deserve attention, too - gc buffer busy acquire, gc current block busy, enq: TX - line lock conflict.
To summarize, your database under a lot of stress - whether it is the legitimate workload, and if this is the case, you may need to upgrade your hardware later. There is chance that it isn't - for example a high number of runs may indicate that rather than to bulk operations database code using PL/SQL loops, which is a big performance killer. Check "Top SQL by executions" about whether or not this is the case.
Good luck!
Best regards
Nikolai -
HelloI got an error message when I add me new group. log files I searched and found the answer on the form. Ago 4 M minimum size of 11 g R2 log file size.
My question is why a log file size depends on DB_BLOCK_SIZE? This parameter is set to the component structures of memory that create an instance when a log file is an operating system file that depend on the version of the OS not DB_BLOCK_SIZE.
Thank you.
SQL > alter database add logfile group 4 'c:\app\asif\oradata\employee\redo04.log' size 1 m;
alter database add logfile group 4 'c:\app\asif\oradata\employee\redo04.log' size 1 m
*
ERROR on line 1:
ORA-00336: 2048 blocks the size of the log file is minimum lower than 8192 blocks
SQL > show parameter db_block_sizeVALUE OF TYPE NAME
------------------------------------ ----------- ------------------------------
Whole DB_BLOCK_SIZE 8192
SQL >You are assuming that the redo log block size is the same as the database block size. This is not correct.
The error indicates that 8192 is the minimum number of blocks of a redo log file. The documentation states that the minimum size is 4 M. For example, you can deduct your redo log block size is 512 bytes.
Here's some more information about the size of redo log, the documentation block.
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It will be better to try and parse text or try and use another method with vCO
If you haven't done so already, take a look at the action of com.vmware.libarary.soap.processOutParameters. It is the action that generated the log you have placed in us. It generates an object Properties (key, value pairs) with the value for each setting that results.
In your case, assuming that 'outProps' is the result of the above, you can use:
var getRequestStatusResult = outProps.get ("GetRequestStatusResult");
And to analyze the code XML with E4X as Ilian said.
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