AWR Report (SQL Ordered By Physical Reads)
Aug 30, 2013
AWR Report regarding ' SQL ordered by Physical Reads (UnOptimized))'. SQL ordered by Physical Reads (UnOptimized)UnOptimized Read Reqs =
Physical Read Reqts - Optimized Read Reqs %Opt - Optimized Reads as percentage of SQL Read Requests %Total - UnOptimized Read Reqs as a percentage of Total UnOptimized Read Reqs Total Physical Read Requests: 3,311,261 Captured SQL account for 13.5% of Total Total UnOptimized Read Requests: 3,311,261 Captured SQL account for 13.5% of Total Total Optimized Read Requests: 1 Captured SQL account for 0.0% of Total UnOptimized Read ReqsPhysical Read ReqsExecutionsUnOptimized Reqs per Exec%Opt%TotalSQL IdSQL ModuleSQL
[code]....
I want to know what is the mean by 'UnOptimized Read Reqs' and 'Optimized Read Reqs 'Question 2) what is 'SQL ordered by Physical Reads tuning'.
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Nov 21, 2011
On 10gR2, I cannot find the exact definition of the 2 following metrics :
"Physical Read Total Bytes Per Sec"
and
"Physical Read Bytes Per Sec"
I would want to know what is the difference between them.
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Jun 27, 2012
Does the counter of event buffer gets include the logical reads ? Does the mertic buffer gets include the event of reading from undo buffer ?
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Aug 5, 2007
There's a fairly popular Ordered Hint example on the web as follows:
<CODE>
select /*+ ordered use_nl(bonus) parallel(e, 4) */
e.ename,
hiredate,
b.comm
from
emp e,
bonus b
where
e.ename = b.ename
;
</CODE>
I would like to know what the "parallel(e, 4)" clause does. Where does the "4" come from? What is "parallel" here? I also have another question: If I have 5 tables--T_OREGON, T_UTAH, T_VIRGINIA, T_TEXAS, and T_OKLAHOMA--lined up in a join right behind a FROM, coming in at row counts of
T_OREGON: [a lot of rows; a lot more than T_UTAH]
T_UTAH: [smaller than T_OREGON] 40550 rows
T_VIRGINIA: 14 rows
T_TEXAS: 66 rows
T_OKLAHOMA: 8 rows
from T_OREGON or, T_UTAH ut, T_VIRGINIA va, T_TEXAS tx, T_OKLAHOMA ok...
my question is, if an Ordered hint can be used here, is it that the smallest table (in this case T_OKLAHOMA) gets placed first in the join and the rest of the table ascension in the join doesn't matter? Or is it that T_OKLAHOMA gets placed first in the join, followed by T_VIRGINIA [at 14 rows], followed by T_TEXAS, T_UTAH, and finally T_OREGON?
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Apr 23, 2012
Attached query taking 80000 reads to execute...
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May 30, 2013
I have following data
WITH t AS
(
select 1 rn, 'A' val from dual UNION ALL
select 2 rn, 'A' val from dual UNION ALL
select 3 rn, 'B' val from dual UNION ALL
[Code]....
I need to calculate a new column "orderedRn" as
Rn Val OrderedRn
------------
1 A 1
2 A 1
3 B 2
4 C 3
5 C 3
6 C 3
7 A 4
8 A 4
9 B 5
10 B 5
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Dec 1, 2012
I have to update a column for all the records in the table with a unique contraint
ex-- select rec_no from tablename;
9
8
7
6
5
now i have to update this like
select rec_no from tablename;
8
7
6
5
4
but when i am doing update tablename set rec_no=rec_no-1 i am getting unique constraint error
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Feb 8, 2013
I am having performance issues on a query in a production environment that I cannot replicate in our test environment. Our test environment is an import of production. Version information is:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bi
PL/SQL Release 10.2.0.3.0 - Production
CORE 10.2.0.3.0 Production
TNS for Solaris: Version 10.2.0.3.0 - Production
NLSRTL Version 10.2.0.3.0 - ProductionWhen I run the query in test, I get the following results using TKPROF
[code]....
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWSThis performance problem started a few weeks ago and the problem seems to be in the high number of consistent reads during fetch. The DBA tried restarting the instance and gathering fresh stats on the tables but that has not made a difference. Now he wants to export the tables, drop the schema and re-import.
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Oct 7, 2013
Firstly the table structures :
Create table cd_patient (pat_mrn varchar2(100)) ;
Create table cd_encount (pat_mrn varchar2(100), encounter_id varchar2(1000));
I need to write a code which dynamically reads the table name from user_tables (starting with cd) & load the data from remote database which has the same table name & structure based on the load number..
Static PLSQL statement would be :
declare
BEGIN
INSERT INTO "cd_patient" C-- DYNAMICALLY GET THE TABLE NAME
SELECT C1.PAT_MRN -- DYNAMICALLY GET THE COLUMN NAME
FROM REMOTE_DB.CD_PATIENT@XXX C1
WHERE C1.LOAD_NUMBER > 2;
[code]....
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Feb 2, 2013
Elapsed Time (s)CPU Time (s)Executions Elap per Exec (s) % Total DB TimeSQL IdSQL ModuleSQL Text
3,263 32 1 3263.49 2.79 3ta0ms19fvgds httpd.exe SELECT CASE WHEN COUNT >= 1...Elapsed
6,360 164 2 3180.17 5.44 51jx99dm0swv7 cpm_srvscript@ahcaxasmil1b (TNS V1-V3) SELECT /*+ CCL<PFT_GET_RP...
On AWR, I see two script that are out of ordinary, and I want to make sure that I interpret them correctly.
1) "Elap per Exec (s)" shows 3263.49 with 1 "Executions".
2) "Elap per Exec (s)" shows 3180.17 each execution with 2 "Executions".
Does this mean that this script ran for ~ 54 minutes (3263.49 / 60 seconds) for 1 "Execution" and ~ 53 minutes (3180.17 / 60 seconds) per each execution? I need to understand "Elapsed Time (s),CPU Time (s),Executions ,Elap per Exec (s), % Total DB Time" represent.
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Nov 7, 2011
I am trying to understand "ordered" hint. I want to use it in my sql where I am using some left outer joins. I believe if I use this ordered hint it will be much faster.
But the problem is I am not able to understand the concept of this hint. As i did alot of search on this eveyone says it will be , even I got some similar references where it worked But I am getting contradicting explanation for on this.
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Nov 29, 2011
is any way to export an Oracle database organized in manner that, both tables and constraints would be exported in the correct order.An easy sample:
- An database with 2 tables, with constraints between them. Table 1 has a FK on Table 2.
Is it possible to export both structure and data regarding the constraints, resulting in an script that makes it possibly to import it in a way that would not give me problems about constraints?
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Feb 24, 2013
Elapsed Time (s) CPU Time (s) Executions Elap per Exec (s) % Total DB Time SQL Id SQL Module SQL Text
2,423 1 3,919 0.62 1.83 gt49gg0fnc5x8 srv_dr@ahs (TNS V1-V3) UPDATE /*+ CCL<OENDB_FILE...
2,227 14 1 2227.16 1.68 bggfx8a04prj9 SQL*Plus select * from (select n.source...
.........
On [SQL ordered by Elapsed Time], [SQL Module] shows an indication that a SQL was executed by which process (i.e. srv_dr@ahs)outside of SQL*PLUS.If [SQL Modeule] shows as [SQL*Plus], does it mean the query was run in SQL*PLUS manually or directly?I have the SQL ID. How do I find out who, how, and exactly what time it was run?
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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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Sep 3, 2010
ORACLE VERSION: 11.2
ENVIRONMENT: physical standby database
MODE: maximum performance mode.
SQL> select * from v$archive_gap;
no rows selected
SQL> select sequence#, applied from v$archived_log where applied='NO';
SEQUENCE# APPLIED
---------- ---------
10929 NO
10930 NO
10931 NO
10932 NO
10933 NO
10934 NO
10935 NO
10936 NO
10937 NO
11073 NO
11074 NO
SEQUENCE# APPLIED
---------- ---------
11075 NO
11076 NO
11077 NO
11078 NO
11079 NO
11080 NO
11081 NO
11082 NO
11083 NO
11084 NO
11085 NO
SEQUENCE# APPLIED
---------- ---------
11086 NO
11087 NO
11088 NO
11089 NO
11091 NO
11092 NO
What would be the cause
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Mar 21, 2012
I would like to implement Oracle RAC with 2 nodes for SE Licence. I did a lot when both this nodes with 3 NICs each were plugged at the same switch. Now I have a need to construct a RAC when two nodes will be in separate locations, abot 4 miles from each one. What should I explain to our network administrator he needs to do to implement this solution? I've been told that they can do a FO channel to each location. But don't have exact clear explicaton.
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Nov 5, 2010
I am trying to duplicate an Database and create an Physical Standby through following command
I took the backup through rman using the following command on Monday
RMAN> run
2> {
3> ALLOCATE CHANNEL C1 TYPE DISK FORMAT 'E:DB_FULL\DB1_FULL_%U';
4> ALLOCATE CHANNEL C2 TYPE DISK FORMAT 'E:DB_FULL\DB1_FULL_%U';
5> ALLOCATE CHANNEL C3 TYPE DISK FORMAT 'E:DB_FULL\DB1_FULL_%U';
6> ALLOCATE CHANNEL C4 TYPE DISK FORMAT 'E:DB_FULL\DB1_FULL_%U';
7> backup database format 'E:DB_FULL\DB1_FULL_%U';
8> backup archivelog all format 'E:DB_FULL\DB1_FULL_%U';
9> backup current controlfile for standby format 'E:DB_FULL\DB1_FULL_%U';
10> }
Today i am trying to clone the DB1 Database as physical standby ...
using the following command
> RMAN TARGET sys/sys@db1 AUXILIARY /
Then I exceuted the following command
> duplicate target database for standby dorecover;
but i am getting error RMAN-06024: no backup or copy of the control file found to restore
contents of Memory Script:
{
set until scn 11182084819076;
restore standby controlfile;
sql clone 'alter database mount standby database';
}
executing Memory Script
executing command: SET until clause
Starting restore at 05-NOV-10
using channel ORA_AUX_DISK_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 11/05/2010 15:45:30
RMAN-03015: error occurred in stored script Memory Script
RMAN-06026: some targets not found - aborting restore
RMAN-06024: no backup or copy of the control file found to restore
i even tried to switch the log file of the primary database DB1 but no avail,
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Jul 23, 2010
I need to rename an Oracle9i database on windows which has a physical standby database running on a different machine.
I have the steps to rename the primary database but am unsure of it's impact on the physical standby database. It seems like I will have to re-create the physical standby database, since renaming the primary database involves opening the db with "resetlogs". It's a production environment hence can't play with it without knowing the results.
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Aug 7, 2013
I have a Physical Standby database on server#2 which has its UNDO and TEMP tablespaces in a mount point that is a bit small. I discovered yesterday that this mount point was completely filled. This is not an immediate problem, because even though the TEMP and UNDO tablespaces are large, there is almost no usage of them.
I logged into my Primary, and created a new temp tablespace (TEMP2), made it the database default, dropped the TEMP tablespace, and then re-created the TEMP tablespace in a different mount point (with a much higher capacity!). I then made the new TEMP as the database default temp tablespace again. I expected that these changes would be propagated over to the Physical Standby via log application, but they didn't come over.
I have standby_file_management set to AUTO, and there are no unapplied logs. Everything OTHER than the temp tablespaces seems to be in synch.
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Sep 22, 2010
I have to implement Physical standby using same SID. parameters required to set on Primary and standby. Also what entries are required to do in TNS file. Recently we have faced hardware failure.
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Sep 2, 2011
I look after a team of DBAs and I have a request to free up space on our very expensive storage system. However the answers on how to do this differ and i'd like to ask for external input...So not being a techincal person I see the world as quite black and white. Meaning that you delete data and you free space but after doing much reading I understand this is not the case, as you essentially create data fragmentation within the datafile resulting in the db having lots more space to write into but not actually freeing space, even if you shrink the file it doesnt free space or do a reorg?
We have as an example a DB with 2 billion rows of data in 1 table, no partioning just one large table. We have worked out that we can probably delete 1 billion rows or even better only keep a rolling 3 month window of data. What would be the suggestion on deleting this data and reclaiming the disk space to actually see additional disk space made available at the os level.
How about deleting the data and reclaiming the space. Through reading it looks like it might be something like, delete, creating new table space partitions from this data. This in theory would create new a tablespace in newly created data files which would result in the data being reorganised and taking up less physical space and when completed you point to the newly created partitions and drop the old tables.
how they have done this as it must be a common problem that people have created some different solutions. What commands, procedures have been used?
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Jun 18, 2012
I have a question about Oracle schemas. Oracle schema is the user with its datase objects (table, index, eg) .In two different Oracle schemas, there can be two tables with same names. When the users connect to same Oracle instance they can access these tables with schema.tablename convention.
However, how is that structure handled in physical database storage. Are there two tables created with same name physically? I mean are these two tables with same name stored in different database files?
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Oct 19, 2011
We're currently in a situation where the primary database server fs size does not match the standby database server fs size.
Standby database filesystem is almost 100% utilized, and we suggested to move some of the datafiles first to avoid threshold alerts and archive gaps.
Now, if we're gonna move datafiles on the physical standby, I believe the process would be stop managed redo apply -> shutdown standby -> OS move -> startup mount -> alter rename -> start managed redo apply. Is this correct? If not, how?
Also, would it have an effect if the controlfiles of primary and standby do not match because of the movement?
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Oct 29, 2010
I want to configure CASCADED Physcial Standby Server...Can i give the DB_FILE_NAME_CONVERT parameter in the primary DB Server as
*.DB_FILE_NAME_CONVERT=(
'C:\ORACLE\ORADATA\PRIMARY\','E:\ORACLE\ORADATA\STANDBY1\','E:\ORACLE\ORADATA\STANDBY2\',
'E:\ORACLE\ORADATA\PRIMARY\','B:\ORACLE\ORADATA\STANDBY1\','G:\ORACLE\ORADATA\STANDBY2\')
Or in the Standby1
*.DB_FILE_NAME_CONVERT=(
'E:\ORACLE\ORADATA\STANDBY1\','E:\ORACLE\ORADATA\STANDBY2\',
'B:\ORACLE\ORADATA\STANDBY1\','G:\ORACLE\ORADATA\STANDBY2\')
I searched in google but could not able to find anything in this regard.
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Jul 24, 2013
I have a setup where i have one physical and logical standby from a primary database. In case of switch over between primary and physical database my logical apply gets stopped. Can a logical database be applied from a physical standby ?
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Jun 13, 2011
I have problems in opening the database of the physical standby in read- write mode/ read only mode. I have a primary server which is running on 2 node RAC and the standby on a seperate single server being used as DR. I recently got this server and my aim was to isolate the standby server from primary server and perform few test. As it has never been tested even once.
Primary Database spec: (2 Node Rac on ASM)
Oracle Version : 10.2.0.3.0
O/s : HP-UX B.11.23
Standby Database spec: (Single Node)
Oracle Version : 10.2.0.3.0
O/s: HP-UX db01 B.11.23
Error:
--------------------------------------------------------------------------------
alter database recover managed standby database cancel;
Database altered.
SQL> alter database open
2 ;
alter database open
*
ERROR at line 1:
ORA-16004: backup database requires recovery
ORA-01152: file 1 was not restored from a sufficiently old backup
ORA-01110: data file 1: '+DATA/dprod/datafile/system01.dbf'
--------------------------------------------------------------------------------
Parameters :
log_archive_dest_2 string SERVICE=PROD1 LGWR ASYNC VALID
_FOR=(ONLINE_LOGFILES,PRIMARY_
ROLE) DB_UNIQUE_NAME=PROD
remote_archive_enable string true
fal_client string DPROD
fal_server string PROD1, PROD2
Steps tried so far:
Changed log_archive_dest_2 = DEFER on both the primary nodes
Standby :
startup nomount
alter database mount standby database;
alter database recover managed standby database disconnect;
alter database recover managed standby database cancel;
alter database open/readonly (tried both)
Same error.
On Primary:
SQL> select max(sequence#) from v$log_history;
MAX(SEQUENCE#)
--------------------------------------------------------------------------------
55702
on Standby:
MAX(SEQUENCE#)
--------------------------------------------------------------------------------
33289
Primary Database:
SELECT SEQUENCE#, FIRST_TIME, NEXT_TIME FROM V$ARCHIVED_LOG ORDER BY SEQUENCE#;
SEQUENCE# FIRST_TIME NEXT_TIME
--------------------------------------------------------------------------------
55700 13-JUN-11 13-JUN-11
55700 13-JUN-11 13-JUN-11
55701 13-JUN-11 13-JUN-11
55701 13-JUN-11 13-JUN-11
55702 13-JUN-11 13-JUN-11
60824 rows selected.
Standby Database:
SEQUENCE# FIRST_TIME NEXT_TIME
--------------------------------------------------------------------------------
55698 13-JUN-11 13-JUN-11
55699 13-JUN-11 13-JUN-11
55700 13-JUN-11 13-JUN-11
55701 13-JUN-11 13-JUN-11
15206 rows selected.
Additional Information : There is a delay of 20 minutes before the logs get applied. which has been intentional set by team. Dataguard broker is not configured as well.
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Jun 4, 2010
I have an issue whereby our standby instance was down for a couple of days and when it came back online we found an archivelog file was missing, so recovery only happened up to a point. It appears that the archivelog was deleted therefore we are unable to continue with this standby. We are now planning to rebuild the standby database. As far as i know all of the steps originally performed need not be performed to complete this task.
1. Shutdown standby
2. Delete all datafiles & redo logs
3. Copy over datafiles to respective directories
4. Copy online logs and archivelogs to standby.
5. Create a control file for standby database
6. Startup mount standby database
7. start redo apply
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Dec 7, 2010
Suddenly I can't open any of my physical standby databases read only. Alert log snippet and trace files follow post. I'm running 9.2.0.1.0 on all hosts, which are running AIX 5.2. I've successfully opened all physical standby databases read only numerous times in the past. Is it possible that these standby databases cannot be switched over to primary should the need arise?
Here's how I typically open a physical standby database read only:
alter database recover managed standby database cancel;
alter database open read only;
Errors in file /ora/product/9.2.0.1.0/rdbms/log/icps1_ora_27382.trc:
ORA-00604: error occurred at recursive SQL level 1
ORA-16000: database open for read-only access
Error 604 happened during db open, shutting down database
USER: terminating instance due to error 604
[code]...
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Mar 10, 2011
I did the all necessary steps required for the physical standby configuration. My standby db is mounted but not able to open.
Below are the steps.
SQL> startup mount
ORACLE instance started.
Total System Global Area 1845493760 bytes
Fixed Size 2021568 bytes
Variable Size 452986688 bytes
Database Buffers 1375731712 bytes
Redo Buffers 14753792 bytes
Database mounted.
SQL> ALTER SYSTEM SET LOG_ARCHIVE_DEST_2='SERVICE=demodb' scope=both;
System altered.
SQL> ALTER SYSTEM SET LOG_ARCHIVE_DEST_STATE_2=ENABLE SCOPE=BOTH;
System altered.
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;
Database altered.
SQL> recover managed standby database cancel;
Media recovery complete.
SQL> alter database open read only;
alter database open read only
*
ERROR at line 1:
ORA-16004: backup database requires recovery
ORA-01152: file 1 was not restored from a sufficiently old backup
ORA-01110: data file 1: '/u002/app/OraDB10g/stdemo/oradata/system01.dbf'
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE FINISH; ALTER DATABASE RECOVER MANAGED STANDBY DATABASE FINISH
*
ERROR at line 1:
ORA-00600: internal error code, arguments: [kcrfrsetnab_found], [1], [136], [],
[], [], [], []
ORA-00600: internal error code, arguments: [kcrfrgv_scn7], [], [], [], [], [],
[], []
SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY;
ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY
*
ERROR at line 1:
ORA-00600: internal error code, arguments: [kccocx_01], [], [], [], [], [], [],
[]
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Sep 17, 2013
Today, I am learning dataguard 11.2.0.1. The docs said:A. Monitoring Standby DB Application of redo logs may be monitored by issuing the SQL command:
SQL> select client_dbid, process, sequence#, status from v$managed_standby;
In the primary database, the sequence# with the status “WRITING” would refer to the current redo log sequence#In the standby database, if the status of the process MRPO is “APPLYING LOG” and the status of the process LGWR is “IDLE”, then application of redo logs is up to dateI see that that MRPO at standby is "WAIT_FOR_GAP". How do I resolve this gap.
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