How Much Block Will Be Read From Disk When A Single Oracle Io Call Occurs
Jul 10, 2012
The block size of my db(10gr2) is 8k, and the db is on the raw device file system on a aix machine.
OS block size is 512k.
How much block will be read from disk when a single oracle io call occurs? Which one is currect, 8K or 512K?
If the block size for a single io call depends on the os block size (512k), I think os block size need to be tuned for oracle block size (8k). If we use raw device file system, os level block size has no meaning?
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Jul 24, 2010
I have a multi record control block (basically a text item displaying 6 records) where user enters values and I want to process the values using pre-insert trigger.
I want to read value in each record and then do some tasks using a pre-insert trigger before I commit the values. To navigate between the records I was using first_record, next_record, clear_record built-ins but it gives errors like "40737-illegalrestricted procedure next_record in pre-insert trigger".
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Aug 31, 2010
My understanding of DB_FILE_MULTIBLOCK_READ_COUNT parameter is that it affects only Full Table Scans and Fast Full Index Scans - all other disk retrieval is single block.If so, then maybe I'm reading this trace incorrectly:
select /*+ first_rows */ pk
from test_join_tgt
where pk >= 0
and rownum > 1
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.01 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 1 21.48 27.77 22368 22134 0 0
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 3 21.49 27.78 22368 22134 0 0
[code]...
What the heck is going on with the Multi-block reads in the Range Scan?
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Jan 16, 2013
I have a main interface that contains 3 buttons (emp, dept, mgr) I want when I click on the button 'emp' interface opens in the main interface(the buttons must remain in the main interface)
see the picture : [URL]
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Aug 30, 2012
we are generating Entity beans at java appication. where application is connecting to DB and copy Table structure in Java class file. when this process start, oracle process takes 100% CPU. while there is no wait event at DB level. only queries are fired on oracle sys tables.(user_tables,user_constraints,etc..)
On trial and error based, we have changed this parameter and that java process works fine. how this parameter effect the on oracle system table.
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Apr 17, 2013
I'm having an issue with an Oracle ref_cursor, how to call the cursor within an anomimous Pl/Sql Block. I did it once but I can't get it working now.
DECLARE
v_cursor sys_refcursor;
t_cursor v_cursor%rowtype;
BEGIN
OPEN v_cursor FOR
[code].....
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Apr 26, 2011
I am trying to create standby with oracle 10g R2 from Solaris 5.10 (sun ultrasparc X86-64 bit) to Solaris 5.10(Intel Xeon 64 bit). All the mount points are the same as primary server. All the data files are at location as specified in control file. I created standby control file from primary. All the control files are at location specified in pfile.
When I am trying to mount database I am getting following error.
ORA-00202: control file: '/oracle/BP1/ctl1.dbf'
ORA-27047: unable to read the header block of file
ORA-205 signalled during: alter database mount...
I try to open database with trace file also but got following error..
ORA-01503: CREATE CONTROLFILE failed
ORA-01565: error in identifying file
'/oracle/BP1/sapdata1/system_1/system.data1'
ORA-27047: unable to read the header block of file
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Nov 17, 2011
I am in charge of several instances located on a Linux server CentOS, virtualized on a ESX 3.5 environment.
From time to time (every 4 to 5 days), I have some errors in the alert.log. Last occurence was last night :
Corrupt block relative dba: 0x01004e12 (file 4, block 19986)
Fractured block found during buffer read
Data in bad block:
type: 6 format: 2 rdba: 0x01004e12
last change scn: 0x0000.131aaa5b seq: 0x2 flg: 0x04
[Code] ........
We are doing user manual backup (with BEGIN/END BACKUP) every night at 8PM, ending at 9PM approx. Then, fractured blocks never occur during backups. At 1AM, the maintenance window is opening, thus explaining the GATHER_STATS_JOB job.
When I check corruption on early morning, I am always unable to reproduce the problem. DBV is OK without issues. We never had a problem with the data itself, whatever it is a table or an index in the reported failed block.
I would like to know what could cause these logical corruption, and how to stop them ?
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Oct 22, 2013
I made this script but I still don't quite understand if the syntax is correct. I just wanted to create a function and call it in an anonymous block. I then wanted it to use a variable as a parameter in an iteration and output the variable every iteration. It's done basically but I know it's not 100% right. The fibonacci function looks like its going to loop an infinite number of times if the parameter is greater than 2.
CREATE OR REPLACE PACKAGE myPACKAGE AS
CREATE OR REPLACE FUNCTION fibonacci
(n BINARY_DOUBLE) RETURN BINARY_DOUBLE IS
BEGIN
IF n <= 2 THEN
RETURN 1;
[code]........
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Jan 9, 2012
The stand alone stored procedure has 2 parameter, an IN and OUT...
CREATE OR REPLACE PROCEDURE someprocedure( businessdate IN NUMBER,
tablename OUT VARCHAR2)
This procedure has multiple inner blocks. Intention is to control execution of each of the inner blocks basing on the value of flag field obtained from a "processlogtable". This processlog table has structure as below.
jobname varchar2(100)
controldate (date)
controlflag varchar2(1)
I have the below code snippet at the beginning of each inner block that checks value of the flag and then proceeds with execution of that block. The intent is to avoid redundant call of a block that has successfully executed first time. That is, once a specific inner block fails for some reason, the re-execution of the stored procedure should AVOID re-executing the PRIOR successed steps.
I've the code set up as below, but the prior successed block(s) code gets re-executed again once the procedure is re-executed after a failure.
CREATE OR REPLACE PROCEDURE someprocedure( businessdate IN NUMBER,tablename OUT VARCHAR2)
CURSOR c_missingtablename
IS
SELECT datatablename
FROM (
SELECT UPPER(datatablename ) TABLE
FROM
WHERE datatableName IN ('Aaa','BbB','CcC');
[code]....
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Apr 17, 2010
When i was starting my database .there was an error
ora-00333:redo log read error block 203 count 8192.
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Jun 26, 2013
I am writing below MERGE statement. In this cardinality between table_a and table_b is 1:2. I.e. each record in table_b corresponds to 2 records in table_a based on columns in ON clause.
Well this query throws below error.
----Error---
ORA-12801: error signaled in parallel query server P011
ORA-30926: unable to get a stable set of rows in the source tables
However, the same statement executes successfully when PARALLEL hint is removed altogether. (There are no duplicates in table_b based on unit,group,loc columns.)
-----Query--------
MERGE /*+ PARALLEL(8) */
INTO table_a a
USING table_b b
ON (a.unit = b.unit AND a.group = b.group AND a.loc = b.loc)
[Code]....
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Apr 22, 2010
My form consist two datablock cust_mstr,cust_dtls, each customer code consists two or three contact details records, when i delete the single detail record instead of deleting single record it deletes all the details records from cust_detail table.
Here by i attaching my form for your reference pls find the code in delete button
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Mar 8, 2010
how can i track the exception for three select statement in one pl-sql block. here is synario.......
begin
select * from emp where empno=1234; --statement 1
select * from cusotmers where cust_id=125; --statement 2
select * from products where product_id='a-3'; --statement 3
end;
i want to track exception any one for ex no_data_found for all these three different statement.
I know if i put this three statement in three different pl-sql sublock then i can trap it....
how can i trap it in one single block?
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May 30, 2010
I have a Master block and a Detail Block. They are related using two columns, Document_ID and Page_no. I want to display all the records in master table with corresponding detail records beside them in single line. i.e., as shown below:
MasterItem1 DetailItem1 DetailItem2 DetailItem3
I created the relation between them and executed query. When I execute query in the form, I can find that all the Master Items are displayed in vertical records, but i can only see one record of detail fields. They are displayed as shown below:
mitem1-value1 ditem1value1 ditem1value2 ditem1value3
mitem1-value2
mitem1-value3
mitem1-value4
When the navigate down in master items, then the corresponding detail values are being shown on the same first record.
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Mar 28, 2011
The main qn is in the subject line.
I have used the following code
GO_BLOCK('CHILD_BLK');
FIRST_RECORD;
LOOP
IF NVL(:CHILD_BLK.SELECT_FLAG,'N')='Y' THEN
V_REC_NO := GET_BLOCK_PROPERTY('CHILD_BLK',CURRENT_RECORD);
SET_ITEM_INSTANCE_PROPERTY('CHILD_BLK.ASSET_DESC',
V_REC_NO,
[code]....
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Aug 26, 2010
We have a Production Oracle 10g R2 RAC on HP-UX v2 IA64 servers.We have Two Disk Groups one for Archive (ARC_DISK - 100 GB) and other for Database(DATA_DISK - 1 TB]. We wanted to add more space to the DATA_DISK disk group.Unix admin configured 200 GB from SAN and changed the ownership of the Disk to oracle and permissions to 775 on 1st Node.I opended DBCA from 1st Node and was able to see the disk in 'Show Candidate'.
I added this disk to the DATA_DISK disk group and clicked OK but got ORA- error with some message like some operations could not be performed. I exited DBCA.We realized that we had forgotten to change the ownerhip and permission from the 2nd Node.Unix admin changed the ownership of the Disk to oracle and permissions to 775 on the 2nd Node.
I opened DBCA again from 1st Node and selected the DATA_DISK disk group but could not find the Disk in 'Show Candiate' open. I clicked on 'Show All' and this disk was shown with Header_Status - MEMBER but not allocated to DATA_DISKGROUP. When I clicked the 'Show Member' option, this disk is not shown for DATA_DISK disk group. I exited DBCA at this point.As this is a critcal Production database I didnt proceed any further and exited DBCA.
Now I need to add this Disk to the DATA_DISK disk group but not sure which option to select. I got one reply from another forum to run DBCA select the DATA_DISK Disk Group and then click 'Show All' and select this Disk (which already has MEMBER as Header Status) and select Force Option and click OK to continue.
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Jan 16, 2013
I Configured an ASM instance and a disk group with two disk for normal redundancy.
> Here .. each disk is 2gb
The disk group has two disks...
SQL> select group_number, name, type, total_mb, free_mb
2 from v$asm_diskgroup;
GROUP_NUMBER NAME TYPE TOTAL_MB FREE_MB
------------ ------------------------------ ------ ---------- ----------
1 DATA NORMAL 4000 3898
as the group has two way mirroring (Normal redundancy) How much data (2 GB or 4 GB) can i keep in the disk group? My conception is I can keep 2 GB data in the disk group... (as the disk group keeps every extent in another disk as mirror)
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Feb 17, 2011
I have 2 servers both having windows server 2008 64 bit as operating system installed on both I need to install oracle clusterware 11g r1 on both servers with clustering on external storage. I have configured the network(private,public and virtual) for both servers and have started the installation.
In the installation of oracle I add both servers but then I reach to a point where they ask me for voting disk or ocr disk in the cluster configuration storage but no disk is present how can i create ocr disk or voting disk on windows server 2008? And the external storage should I buy a special type of storage that supports clustering to continue my work?
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Aug 27, 2012
We have occurrences of enq : TX - index contentions in the database. Using the SQL ID, we have identified the INSERT statement and the table which they are trying to insert.
This table has almost 25 different indexes, some of which are unique as well.I am wondering how to identify the actual index causing issue, out of these 25 indexes.
Is there any way to pin point to the name of index which is causing the lock?My plan is, once the index is identified, I would like to check the extents and inittrans and other attributes of this index to fix.
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Feb 1, 2013
I understand the architecture of solid state drives favor different types of I/O. Oracle 11g introduced the database flash cache which allows flash storage to be used as a secondary cache. With database flash cache serving as a secondary cache to my Oracle buffer cache.
My understanding is I need to config two database parameters DB_FLASH_CACHE_FILE and DB_FLASH_CACHE_SIZE. If i want to have certain tables/indexes to take advantage of this extra cache I would set the value KEEP within the parameter.
Is there anything that needs to be done to the tablespaces / datafiles.
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Nov 4, 2011
Tell me that in Oracle 11g, information regarding voting disk location is stored in which file ?
I know that we can use "crsctl query css votedisk" to see the location of voting disk, but from which file or place this command pick the information ?
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Apr 21, 2010
What is the query to check disk space usage for oracle 10g ? What is the query to check percent of disk space usage for oracle 10g ?
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Oct 18, 2013
If we want to know the number of instances, number of RAC databases and whole total disk space used by oracle (not file system size),1. Any script can be ran from OEM grid control against all instances/databases? or2. we have a repository unix server which has all tnsnames of whole databases, any script we can run from there?
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Oct 25, 2012
I am using 11.2.0.1.0 on RHEL 5.4ASM is properly working on my machine. database is running from ASM. I want to configure additional oracleasm devices.command fails saying:
$ oracleasm createdisk ASMDISK08 /dev/xvd8
Writing disk header: done
Instantiating disk: failed
Clearing disk header: done
I am creating asm diskgroup on loopback devicesHere are the configured loopback devices.
[root@host1 ~]# ls -l /dev/loop[1-9]
brw-rw-rw- 1 oracle oinstall 7, 1 Oct 25 14:42 /dev/loop1
brw-rw-rw- 1 oracle oinstall 7, 2 Oct 25 14:42 /dev/loop2
brw-rw-rw- 1 oracle oinstall 7, 3 Oct 25 14:42 /dev/loop3
brw-rw-rw- 1 oracle oinstall 7, 4 Oct 25 14:42 /dev/loop4
[code]...
I am unable to understand where is the problem.
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Oct 17, 2013
We have 2 servers running Oracle 11gR2 Window server 2008 64 bit RAC. Today I add new shared disk visible from both servers. All our data placed on ASM partitions, but we need Windows volume for exchanging some data between servers & users;Actions:then i have prepare disk on shared storage from 1st node, run diskmfmt.msc & rescan disks when windows recognizes new hdd, initialize it.create an Extended partition & Logical drive & Assign drive letter. from another nodes, make sure no drive letter is assigned.
Sometimes Windows automatically assign drive letter. If drive letter is assigned, right click & Change drive letter & Remove. from 1st node, format this logical drive using ocfsFormat.exe after execute below scripts i have face some issues
E:app11.2.0gridcfs>ocfsformat /m P: /c 1024 /v DATA /f /d /aReg Get Cluster Name(): Reg Query ValueEx for CFS_CLUSTER_NAME failed with error 203
This indicates that the Cluster Name has not been configured on this node for OCFSThe volume formatted in this condition will be seen by all nodes running OCFS.
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Dec 27, 2010
my question is how to read ocr in oracle rac?
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Dec 11, 2012
I am having 2 data centers within 1/2 km distance. And we kept each vote disk in once site. In case of site failure, the cluster needs a 3rd set. We don't have 3rd site.
Last open world, Oracle announced that oracle storage on cloud as announced. If I get the small space on the cloud, can i put my 3rd vote disk on the cloud?
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Apr 25, 2012
row can be marked as read only in Oracle database
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Jul 1, 2012
i try to install oracle grid infrastructure 11r2 on cent OS 4.8 on vmware workstation 8.0.2..ASM disk is not showing ,i had also change disk discovery path to 'ORCL:*'i had already configure ASM disk using /etc/init.d/oracleasm createdisk...successfully..
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