Slow Performance On New 11gr2 Linux DB?
Aug 27, 2013
we are busy updating one databasee from a windows platform 2003 oracle 10G to a linux and oracle 11r2
We exported/imported the data and it looks ok Explain plans look the same . but our heavy batches are twice slower than on the windows box ,the two top events are disk related, sequential and scattered reads there are 90% of the time of the batch job , i read some white paper and found that using ASM can be bad in some cases the same with the linux for this particular kind of scattered reads , i was just wondering if just changing the SGA to 10GB instead of 4GB to get more cache and speedup the things .
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May 25, 2013
I am using 11gR2 on windows server. This is the query that runs many times a day and effect badly the performance of database. I don't have much idea about this query.
SELECT TO_CHAR(current_timestamp AT TIME ZONE 'GMT', 'YYYY-MM-DD HH24:MI:SS TZD') AS curr_timestamp, COUNT(username) AS failed_count
FROM sys.dba_audit_session
WHERE returncode != 0 AND TO_CHAR(timestamp, 'YYYY-MM-DD HH24:MI:SS') >= TO_CHAR(current_timestamp - TO_DSINTERVAL('0 0:30:00'), 'YYYY-MM-DD HH24:MI:SS')
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Feb 23, 2011
We have 2 node cluster with 10.2.0.4 home and 11.2.0.2 home under 11gr2 grid infrastructure with ASM in LINUX environment. We are planning to add 3rd node to this cluster. Is there any issues to add 3rd node to existing environment or running fine.
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Jun 22, 2012
Question: to migrate from oracle 10gR2 in Windows to oracle 11gR2 in Linux . Steps are:
1. need to expdp all schemas/users from oracle 10gR2 in Windows,
2. then impdp each schema/user into oracle 10gR2 in Linux first,
3. then upgrade the oracle 10gR2 in Linux to oracle 11gR2 in Linux ?
4. Do I need to pre-create all the same tablespaces first in oracle 10gR2 in Linux ?
Is it correct ? or I can migrate straight all schemas/users from oracle 10gR2 in Windows to oracle 11gR2 in Linux using impdp ?
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Jan 11, 2011
I need to setup Oracle 11gR2 single node @ Linux RHat 5 64-bit for long performance tests, huge loads, high speeds, a lot of transactions, having a good scalability, etc.
It's not a production server, but for strong system/volume tests.
CPU
Motherboard
Memory
HDD
Network
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Feb 3, 2013
am trying to install rac 11gr2 config on linux 5.5 on vmware server.
following doc:
[URLs]...
but as in the first step VMware Server Installation:First, install the VMware Server software. On Linux you do this with the following command as the root user.
# rpm -Uvh VMware-server*.rpm
i couldn't find any where on linux disks.
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Dec 29, 2010
We are using Oracle 11gr2,centos linux.
In the OWB mapping,I needed to transfer data in lob table1 to lob table2 .Both tables are in 2 different schema.The table1 has blob and clob columns.The table 2 has same structure like table 1 and the table 2 is empty.
I have created the mapping and connected directly from the source table to the target table.Also , I have created a error table for the target table table. As for the data rule method,I customized the error table to log the non unique rows.
When I start validating the mapping . I got the following error
VLD-3200 Deduplicator cannot contain LOB type columns
How to log the error in error table for transferring lob type table1 to lob type table 2
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Apr 26, 2013
I am running one simple delete statement in one table with rownum<10000 but it is taking nearly 10 to 15 mins.Table doesn't have any child table rows and triggers.
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Jun 25, 2013
I am trying to insert huge data into another huge table which is almost taking around 2-3 hrs. See my below query
INSERT /*+ APPEND *//*+ NOLOGGING */ INTO DB1.Table1 SELECT * FROM DB2.Table2 ;
COMMIT;
Both Table1 and Table2 have same structure and table1 is master table having 100 Billion records and table2 having 30 Million records. This is a direct insert where each day this operation carried.
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Sep 23, 2010
We have a MV which fetches data from around 27 tables containing 26 joins out of which 25 are outer joins. Some tables in the query are being referred multiple times through different alias names and hence the actual no of physical tables used is 18. This MV takes about 50 mins to refresh through complete refresh mechanism. We decided to make it fast refresh and thus made these configurations:
- Created MV logs based on rowid for each of the base tables.
- Recreated MV using FAST refresh,with primary key option enabled
- Pulled rowid for all these tables in the select column statement.
Even after making all the recommendations suggested by Oracle for fast refresh MV's we are still getting refresh time of around 65 mins(refresh time increased!!!).We already have indexes built on all the join columns of the base tables. What else do we need to do to make this a "fast" refresh MV ?
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Jan 12, 2011
I'm extracting/retrieving the data from the oracle database using Java application it's bit slow. However, when I retrieve from the SQL server it's faster than oracle.
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May 22, 2012
My ERP Application is responding fast while running reports or saving entries, if Oracle 10g Express Edition (XE) is installed. But in Oracle 10g Enterprise Edition or Standard Editions the same application is running very slow.
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Sep 4, 2011
If a table(have a primary key) is empty(after truncate),the sql of dml(insert,update) is very quickly,but if the table have many rows about 10,000,000 rows, the dml is very slowly,why?
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Mar 23, 2012
we are using oracle 9i on AIX Server. When Customer were accessing the database, accidentally power was shut down. we restarted the Server,and Oracle database. all resumed successfully.
However while doing "Payments by the customer" it takes a lot of time to insert even a single payment record on database.The database is Live and our customer are very much frustrated,
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Oct 9, 2013
I have table with 129 million records.
If I just to select count(*) on the table its taking more than a minute in Sql Developer.
The table structure is as below, Primary key is a sequence and then 3 foriegn keys and one non-unique index on the date column.
<Table_Name>
column1 NOT NULL NUMBER ( Primary Key)
column2 NOT NULL NUMBER ( FK1)
[Code].....
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Nov 14, 2012
The product I work on requires a query to tell us what tables are dependent on certain types.
SELECT dba_tab_cols.owner,
dba_tab_cols.table_name,
dba_tab_cols.data_type_owner,
dba_tab_cols.data_type
FROM dba_tab_cols
JOIN dba_types
ON dba_types.owner = dba_tab_cols.data_type_owner
AND dba_types.type_name = dba_tab_cols.data_type
WHERE (dba_types.owner IN ('SCHEMA1', 'SCHEMA2'......))
I find this query to be pretty slow. I think it is because data_type_owner in dba_tab_cols is not indexed. Adding an index is not an option because users expect our product to read-only.
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Oct 10, 2011
I just trying to import some informations from excel to Oracle using OLE2 over Oracle Forms 6i, but It´s very slow when I have import under then 10k lines. anything to optimize that ? Follow the code used...
application OLE2.Obj_Type;
workbooks OLE2.Obj_Type;
workbook OLE2.Obj_Type;
[Code]....
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Jul 4, 2011
Few days ago, My database server no access to StorageBox then I reboot it then after works fine. But, know DB import process is too slow. Before 100GB DB import process completed within 10 hours when server normal running. Now 2 day working, but not complete
How to investigate this issue? Maybe I miss increase some parameters on the Server or Oracle?
Here is my server brief info:
RAM is 16GB,
SWAP size is 16GB,
CPU 12 cores
SQL> show sga;
Total System Global Area 4294967296 bytes
Fixed Size 1984144 bytes
Variable Size 369105264 bytes
Database Buffers 3909091328 bytes
Redo Buffers 14786560 bytes
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Jun 18, 2012
I have an Oracle database (9.2.0.7) installed on a HP-UX server.When trying to access this database from another HP-UX or Linux server, connection is fine. But when trying to connect from a Windows based client, connection is very slow (almost 1 minute to return the result of a 'select count(*)' like query, which is immediate from the Linux client).
Here are some facts I can add :
- Clients and servers are on the same network segment (it is not a network matter)
- No matter which client version I use, there no difference
- I tried to know what happens on the Oracle server when performing my sample query using tusc command : the result is that the server is performing exactly the same actions when sending my query from a Linux client or a Windows client
- The only relevant difference seems to be the client OS
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Sep 14, 2012
I have a query which takes 5 minutes when run through the java app which uses hibernate. I've cut and pasted the SQL directly from hiberate trace file and run it in sqlplus/sqldeveloper and it runs instantly (0.01 seconds)(uses the index all ok and explain plan looks good - see below.) I don't know how to get the explain plan when it's running through the app or why it should be any different anyway as the query is identical.
My query is as follows:
SELECT /*+ INDEX (SPD SPD_SEQ_CODE) */ SPD.*
FROM SEQ_ADDR_DATA SPD, SEQ_ADDR_LEVELS SPL
WHERE SPD.SPVR_ID = '10'
AND SPL.SPLE_ID = SPD.SPLE_ID
AND SPL.SPLE_LEVEL <= '2' AND SPDA_ID NOT IN
[code]....
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Oct 16, 2012
I am building a database to store call quality statistics for VOIP networks. It is a very insert heavy application, and data reliability is of relatively minimal importance (in the sense that a few corrupt call records here and there doesn't matter the way corruption does in for example a banks database). Long term storage is also unimportant, most customers only wish to keep 3 months of data readily available in the database. Most do not even archive the older data.
To that end I am searching for every possible way to improve my insert performance and the internet has turned me onto the idea of NOLOGGING. These are the steps I have taken to reduce my IO consumed by the Redo and Undo logs.
1. I am inserting with the APPEND_VALUES hint.
2. I have disabled force logging at the database level
3. I have disabled force logging at the tablespace level
4. I have disabled logging on the relevant table and each of its indices
As best I can tell this is all I can do to minimize Redo/Undo, but based on my observations of the Disk portion of the WinServer2008 Performance Monitor, this has made little to no change in the amount of IO to my REDO and UNDO files. IO to the .dbf containing my table makes up less than 20% of the total disk IO for oracle.exe, the rest is the REDO and UNDO logs.
asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:897564200346274711
The above article is a little over my head but I am able to extract from it that I will never entirely eliminate REDO/UNDO, which is fine, but I would think I could get it lower than it currently is.ted.
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Dec 29, 2012
I am aware that from 11g, memory_target is sufficient for memeory management between SGA and PGA.
what happens if MEMORY_TARGET set to non-zero and SGA_TARGET set to zero values in a 11g database? Does it enable automatic memory management within the SGA?
We regularly hit by ORA-4031 errors. Also, memory_target advisory (v$memory_target_advice) does not show any advisory information.
for eg:
memory_max_target = 500m
memory_target = 500m
and
sga_max_size=500m
sga_target=0
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Jan 16, 2012
In my production ENV there is two node RAC database is running , and on both machine RAM size is (35GB on node1,41GB on Node2) and other configuration is like below.
SGA SGA_TARGET DB_BLOCK_SIZE DB_MULTIBLOCK_READ_COUNT
NODE1 16G 14G 8K 16K
NODE2 16G 14G 8K 16K
Our Database size is 700GB approx.
The above SGA configuration is ok or need to be increase the size of SGA , our HIT RATIO is almost 99%.
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Dec 24, 2012
The below query is taking high CPU almost 98% and longer time to execute.
SELECT ancestor,
Max(D.alarmstate) ALARMSTATE,
Max(D.sialarmstate) SIALARMSTATE,
Max(D.uncralarmstate) UNCRALARMSTATE,
Max(M.commstate) COMMSTATE,
Max(M.nncommstate) NNCOMMSTATE,
Max(M.servicestate) SERVICESTATE,
Max(M.abnormal) ABNORMAL,
CASE
[code]....
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Feb 9, 2012
We are having major differences in performance when accessing an Oracle 11gR2 database from two different environments.
I won't sadden you with the gory details of the full application but I will use an indicative example of our problem.
We have SQL Developer in both environments. In each of these SQL Developer instances is a defined a connection to the same database on another machine. So there is the PC looking at a database and a virtual instance looking at the same database.
Selecting the '+' sign next to 'tables' for that connection, on the PC the list of four tables comes back in 4 seconds but on the virtual instance the list of the same four tables comes back in 1 minute and 50 seconds.
This sort of timing issue is repeatable for all accesses to the Oracle database on the third machine.
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Apr 17, 2012
The issue is slow insertion in particular table(i.e A Table) it means insertion in all other tables(i.e B, C, D tables) in same schema is going properly but only when i am trying to insert in one particular table(i.e A table) in same schema it takes long time to complete insertion. Daily insertion is 6000 rows.
I have check all the details like Tablespace size, Analyzing of table, Analyzing of indexes and all. There is no any error alertlog file.
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May 16, 2007
We have two database instances on the same server. One was left at 9.2.0.7 and one was upgraded to 10.2.0.3. Connecting externally (sqlplus '/as sysdba') to the 9.2.0.7 database is lightning fast. Connecting externally to the 10.2.0.3 database is very slow, comparatively speakiing. This is on an IBM AIX-5L (64-bit) machine. We are using "tnsnames".
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Aug 3, 2010
WHY PARAMETRIZED CURSOR IS SLOW
I have the following query which is very slow
CURSOR c_party_ids (p_party_name VARCHAR2, p_party_type VARCHAR2, p_eval_active NUMBER)
IS
SELECT a.party_id,
a.party_type,
b.cust_account_id,
b.attribute17
[code].......
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Sep 3, 2012
I am migrating a oracle 9i database to 11g r3. I can only use imp. As the database is huge, I have split the exp dump by schemas. In my recent test, i have split the schema into 4 seperate threads to be imported into the new oracle11g database. The 4 thread of imp consist of almost similar sizes of schema (Eg thread 1 - Schema 1, 2 ,3. Thread 2 - Schema 4,5,6 etc)
All the dump files are in the same mount point. When i execute the import (4 threads) together, the total import timing is each thread is between 2.5 days to 3.5 days.
Then i proceed to try only 1 thread, only 2 hrs. So could this be a IO issue or oracle memory problem?
Specs
IBM AIX 6.1, 32GB RAM
Oracle
24GB AMM
Number of processes 500
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Apr 22, 2012
We have done cloning of our ORACLE APPLICATION(11i),after that performance of ERP is getting slow (like fetching of data). What we can do to increase the performance.
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