Performance Comparison TDE Versus Plain Tablespace
Dec 9, 2008
Environment Setup
Oracle Server 11g on HP-UX
Oracle Client on Windows
I am using swingbench tool to generate load on DB and using OLTP like benchmark i am comparing the performance of plain data and encrypted data.
I have created two different database. one for tde and other for plain. I have populated same number of rows in both databases. Then i start running the benchmark and i use SAR to collect disk I/O's, VSAR to CPU usage.
From the sar report it seems that,
Oracle plain has faster transactions, it uses minimum CPU. But when look in tot the Reads/Writes TDE has lower than the plain.
If TDE needs to encrypt the data to store in the disks it should occupy more space than the plain data. Then the I/O should be more in TDE..
Note: Bcz the DB parameters are same, number of rows in the tables are same. File system and its block size are same. I will run the swingbench seperately for both the databases.
I am attaching the excel sheet for sar results. Let me know if you need more information
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Jan 26, 2011
My database version is
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production
PL/SQL Release 11.1.0.7.0 - Production
CORE 11.1.0.7.0 Production
TNS for Linux: Version 11.1.0.7.0 - Production
NLSRTL Version 11.1.0.7.0 - Production
My os version is
Linux damdat01 2.6.18-128.7.1.el5 #1 SMP Wed
Aug 19 04:00:49 EDT 2009 x86_64 x86_64 x86_64
GNU/Linux
My database is OLP system.
My question is what are the advantages and disadvantages having one single tablespace versus multiple tablespace?
Easy to maintain when you have single tablespace. but hard to track the IO issues if you have one single tablespace.
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Jun 21, 2010
I have written a java code which reads 2 millions of data under a particular column from CSV file and store it into a set. Now there is a table in Oracle database which contains 10 millions of records for that particular column. Now, I want to form a SQL query which select those records under that particular column from the database table which is in CSV file but not in database table. For e.g.
If I consider the CSV file name as employee.csv and it has column called employee_name under which the records are as follows
employee_name
---------------------
Sudip
Kaushik
Joyanta
Soumya
Ritesh
Gautam
And the database table name called cmp_employee and it has column called employee_name under which the records are as follows
employee_name
--------------------
Sudip
Kaushik
Joyanta
Soumen
Souvik
Sahoo
Now, the "SQL Query" should return ---- "Soumya, Ritesh, Gautam" this three names.
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Aug 22, 2012
I have taken the tablespace export it came 2.1gb and for the same user i have taken the schema export it came 5.1gb
why their is a lot of difference in size?
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Jul 20, 2010
With a very large database (VLDB) for a data warehouse (DW) using primarily a STAR based schema in an environment in which time (both human and CPU) is orders of magnitude more valuable than storage capacity, is there any signficant difference in query performance when tables have all fixed length (CHAR) columns compared to tables with variable length (VARCHAR2) columns?
I realize this is one of those "in general" questions so considering "a given VLDB DW environment" with all other things being equal, what, if any, is the time based performance difference between a database of tables with all fixed sized columns versus one of tables with variable length columns ?
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Jan 27, 2011
I was comparing cost of rebuild vs create index...I carried out the following test
SQL> create table t4 as select * from t1;
Table created.
SQL> create table t5 as select * from t1 where 1=2;
Table created.
SQL> create index i5 on t5(id);
Index created. SQL> select bytes,extents,blocks from user_segments where segment_name='I5';
BYTES EXTENTS BLOCKS
---------- ---------- ----------
65536 1 8
SQL> alter index i5 unusable;
Index altered.
SQL> alter table t5 nologging;
Table altered.
SQL> Alter session set skip_unusable_indexes=True;
Session altered.
SQL> insert /*+ append */ into t5 select * from t1;
563904 rows created.
SQL> commit;
Commit complete.
Now I compared the cost (elapsed time, logical I/O) of the operations
create index i4 on t4(id);
Vs
alter index i5 rebuild online;
Following is the related trace of above 2 steps
create index i4 on t4(id)
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.00 0.00 0 1 0 0
Execute 1 1.17 3.38 9497 7869 335 0
Fetch 0 0.00 0.00 0 0 0 0
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 2 1.17 3.38 9497 7870 335 0
Misses in library cache during parse: 1
Optimizer goal: CHOOSE
Parsing user id: 5
[code]....
So which option we shall pick in such cases? {Of course I haven't set 'nologging' for the indices but it is same for both indices we are comparing}
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May 7, 2011
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I've been trying to find documentation about this, but have not had any luck yet. My guess is that it would be better to allow Oracle to cache this data - meaning increase the SGA target and max size to allow for a larger buffer cache. However, the nice thing about the AIX cache is if process memory is needed, the file system cache gives up pages. If the memory was allocated to the SGA, its pretty much locked in.
I have read several articles stating that a larger buffer cache is not always better, as a larger cache takes more management. But having both of the caches active seem to be a waste of memory, effectively storing the data twice - once in AIX persistent pages and a second time in Oracle database buffer cache.
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Dec 9, 2011
If you have 3 tables (yr09, yr10,yr11) one with 2009 data, 2010 and 2011 data respectively. And a view (vw_yr091011) with a "union all" on all three.
Question: Will the performance be same for the following two queries ?
Question: Will Oracle read all 3 tables in the view when we search for only one year ?
select count(*) from yr09
where year = 2009;
-- vs
select count(*) from vw_yr091011
where year = 2009;
The following link says yes, the performance remains the same.
Link: [URL]..........
when I tried on a volume of 14000 records. The count came out same but the view took 50 more sec. And the explain plan shows it accessed all three tables.
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(
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f2 varchar2(20) not null,
f3 number not null,
f4 varchar2(50),
[code]....
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If my tablespace goes beyond 80% I should get a email from Unix crontab.
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2)critical for tablespace 90%full..
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Do I need 2 scripts? Is there anything ready available (Oracle 10g).
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Aug 25, 2013
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whether i should create as many no of encrypted table spaces as it was before as unencrypted tablespace? or I should create one encrypted tablespace and move all the tables/indexes into that?
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Nov 17, 2011
I am getting temp tablespace error "ORA-01652: unable to extend temp segment by 128 in tablespace TEMP" for the following code.
SELECT /*+ USE_NL ( vd1 ,vd2 ,vd3 ) leading ( vd1 ,vd2 ,vd3 , tvd) */ vd1.vendor_record_seq_no,
tvr.checksum, tvr.rownumber, tvr.transaction_type, 'U'
FROM vendor_data vd1, vendor_data vd2, vendor_data vd3,
(SELECT rownumber, MAX (DECODE (control_column_seq_no, 91150, original_value, NULL)) AS value1,
[code]...
Right now used tables has the following number of records-
SELECT COUNT(*) FROM vendor_data --292890442
SELECT COUNT(*) FROM temp_vendor_data --0
SELECT COUNT(*) FROM temp_vendor_record --0
This query is part of an application, but consuming too much of temporary tablespace (68 GB allocated). I found it out by using query below:
select * from v$session a, v$sql b
where a.sql_id=b.sql_id
and status = 'ACTIVE'
I am not sure, why this problem is occuring.
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SELECT SUB.TABLESPACE_NAME, SUB.STATUS, SUB.EXTENT_MANAGEMENT, SUB.SEGMENT_SPACE_MANAGEMENT, SUB.TOTAL_SPACE_MB, SUB.USED_SPACE_MB, SUB.FREE_SPACE_MB, SUB.PERCENT_FREE_SPACE, SUB.CONTENTS, SUB.TABLESPACE_GROUP, CASE WHEN SUB.TABLESPACE_NAME = P.VALUE AND SUB.CONTENTS = 'UNDO' THEN 'YES' ELSE 'NO' END
[code]...
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Jul 25, 2012
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Dec 15, 2010
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Case
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I have two columns in database
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Jun 28, 2010
SQL> select * from query;
CUSTO SWITCH DATE_X METRIC COUNT_X SEQUENCE_NO FILE
------- ------- --------- ------- ---------- ----------- ----
JCI S1 28-JUN-10 PORT1 10 4 TNB
JCI S1 28-JUN-10 PORT2 4 4 TNB
JCI S1 28-JUN-10 PORT3 8 4 TNB
JCI S2 28-JUN-10 PORT1 1 2 TNB
JCI S2 28-JUN-10 PORT2 5 2 TNB
JCI S3 28-JUN-10 PORT1 6 8 TNB
JCI S5 28-JUN-10 PORT2 2 4 TNB
------->s5 only in the current month-it was not in the previous month data collection
-----------------------------------------------------------------------------
JCI S1 28-MAY-10 PORT1 10 3 TNB
JCI S1 28-MAY-10 PORT3 5 3 TNB
JCI S2 28-MAY-10 PORT1 4 1 TNB
JCI S2 28-MAY-10 PORT2 2 1 TNB
JCI S2 28-MAY-10 PORT3 8 1 TNB
JCI S3 28-MAY-10 PORT2 7 7 TNB
JCI S3 28-MAY-10 PORT3 5 7 TNB
JCI S4 28-MAY-10 PORT1 2 10 TNB
------->s4 in the previous month data
15 rows selected.
1 SELECT A.CUSTO,A.SWITCH,
2 A.PORT1-B.PORT1,
3 A.PORT2-B.PORT2,
4 A.PORT3-B.PORT3
5 FROM (SELECT
6 A.CUSTO
[Code] ......
CUSTO SWITCH A.PORT1-B.PORT1 A.PORT2-B.PORT2 A.PORT3-B.PORT3
------- ------- --------------- --------------- ---------------
JCI S1 0 4 3
JCI S2 -3 3 -8
JCI S3 6 -7 -5
How to include the Switch S4 and S5 in the output. how implemented FULL OUTER JOIN
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Sep 1, 2010
I need to populate a table based on the results of comparing sets of data. I decided to do this using MULTISET EXCEPT, but having created the structure, do not know whether it is actually possible, and if so, what syntax to use.
I have created:
CREATE OR REPLACE
TYPE NUMBER_TBL IS TABLE OF NUMBER;
/
CREATE OR REPLACE
TYPE PACKAGE_OPTION_GROUP_OBJ AS OBJECT( ID NUMBER, benefits NUMBER_TBL )
/
CREATE OR REPLACE
TYPE PACKAGE_OPTION_GROUP_TBL AS table of PACKAGE_OPTION_GROUP_OBJ
/
I have populated the following:
selectedTable PACKAGE_OPTION_GROUP_TBL := PACKAGE_OPTION_GROUP_TBL();
defaultTable PACKAGE_OPTION_GROUP_TBL := PACKAGE_OPTION_GROUP_TBL();
groupTable PACKAGE_OPTION_GROUP_TBL := PACKAGE_OPTION_GROUP_TBL();
comparisonTable PACKAGE_OPTION_GROUP_TBL := PACKAGE_OPTION_GROUP_TBL();
Once populated they contain the following data:
***selectedTable***
GROUP_ID : 121
BENEFITS : 161
---------------------------
GROUP_ID : 123
BENEFITS : 165
BENEFITS : 167
---------------------------
***defaultTable***
GROUP_ID : 121
BENEFITS : 161
---------------------------
GROUP_ID : 122
BENEFITS : 162
BENEFITS : 163
---------------------------
***groupTable***
GROUP_ID : 121
BENEFITS : 161
---------------------------
GROUP_ID : 123
BENEFITS : 165
BENEFITS : 166
---------------------------
I first need to compare the ID field only of selectedTable with defaultTable to find where they differ, something like
comparisonTable := selectedTable MULTISET EXCEPT(ID) defaultTable
I am expecting the result to be something like:
***comparisonTable***
GROUP_ID : 123
BENEFITS : 165
BENEFITS : 167
---------------------------
However, I don't know if this is possible and if so, what the syntax would be.
At a later stage, I will need to compare the benefits between selectedTable and groupTable, where the GroupID's match, which is why I have the tables structured in this way.
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