Time taken to truncate table

Hi,
We use Oracle 9.2.0.8.
There is a table whose size is almost 30GB.
Considering there are no locks and just one index string on this table, is there a way to estimate the time taken to truncate this table?
I need to plan this activity. Does anybody can give me any idea about time based on old experiences?
Thanks in advance,
Fer

Seconds... (if there are no locks).
Truncate is an operation on data dictionary metadata. Oracle will free all extents exept the first one and will mark all blocks in the first extent as unused. No data blocks are "formatted" or "cleared". (If you open your datafile in hex editior, you can still see contents of datablocks - names, addresses, phone numbers etc.).
If truncate does not complete in 15 seconds, you can start looking for locks.
You can also try:
LOCK TABLE my_30gig_tab IN EXCLUSIVE MODE;
before attempting TRUNCATE.
If there are locks on the table then your session will "hang" on LOCK TABLE statement (your session will wait, but it can take long time), but subsequent TRUNCATE should be fast.

Similar Messages

Truncate table taking too much time

hi guys,
thnks in advince.......
oracle version is =9.2.0.5.0
os/ version =SunOS Ganesha1 5.9 Generic_122300-05 sun4u sparc SUNW,Sun-Fire-V890
application people-soft
version=8.4
every thing is running fine from last week .
whenever process executed like billing ,d_dairy.
it selected some temporary tables and start truncate tables it takes 5 mint to 8 mint even table has 0 rows.
if more then one users executed process but diff process it comes in lock ..
regs
deep..

Hi,
Here iam sending details of technical settings.
Name                 ACCTIT                          Transparent Table
Short text            Compressed Data from FI/CO Document
Last Change        SAP              10.02.2005
Status                 Active           Saved
Data class         APPL1   Transaction data, transparent tables
Size category      4       Data records expected: 24,000 to 89,000
Thanku

Report to display Average time taken for processing payments".

Hi,
I have been asked to develop a report for "Report to display Average time taken for processing payments".
Could any one guide me technically what are the different tables i need to take to generate the report. Treat this is very urgent. Pls provide sample code too....
Thanks in advance....

Given below is the set up for credit card payment processing:
Set Up Credit Control Areas:
Define Credit Control Area
Transaction: OB45
Tables: T014
Action: Define a credit control area and its associated currency. The Update Group should be 00012. This entry is required so the sales order will calculate the value to authorize
Assign Company Code to Credit Control Area
Transaction: OB38
Tables: T001
Action: Assign a default credit control area for each company code
Define Permitted Credit Control Area for a Company
Code
Transaction:
Tables: T001CM
Action: For each company code enter every credit control area that can be used
Identify Credit Price
Transaction: V/08
Tables: T683S
Action: Towards the end of the pricing procedure, after all pricing and tax determination, create a subtotal line to store the value of the price plus any sales tax. Make the following entries:
Sub to: A
Reqt: 2
AltCTy: 4
Automatic Credit Checking
Transaction: OVA8
Tables: T691F
Action: Select each combination of credit control areas, risk categories and document types for which credit checking should be bypassed. You need to mark the field no Credit Check with the valid number for sales documents.
Set Up Payment Guarantees
Define Forms of Payment Guarantee
Transaction: OVFD
Tables: T691K
Action: R/3 is delivered with form 02 defined for payment cards. Other than the descriptor, the only other entry should be 3 in the column labeled PymtGuaCat
Define Payment Guarantee Procedure
Transaction:
Tables: T691M/T691O
Action: Define a procedure and a description.
Forms of Payment Guarantee and make the following entries Sequential Number 1
Payment Guarantee Form 02
Routine Number   0    Routine Number can be used to validate payment card presence.
Define Customer Payment Guarantee Flag
Transaction:
Tables: T691P
Action: Define a flag to be stored in table.
Create Customer Payment Guarantee = Payment Card Payment Cards (All Customers can use Payment Cards).
Define Sales Document Payment Guarantee Flag
Transaction:
Tables: T691R
Action: Define the flag that will be associated with sales document types that are relevant for payment cards
Assign Sales Document Payment Guarantee Flag
Transaction:
Tables: TVAK
Action: Assign the document flag type the sales documents types that are relevant for payment cards.
Determine Payment Guarantee Procedure
Transaction: OVFJ
Tables: T691U
Action: Combine the Customer flag and the sales document flag to derive the payment guarantee procedure
Payment Card Configuration
Define Card Types
Transaction:
Tables: TVCIN
Action: Create the different card types plus the routine that validates the card for length and prefix (etc)
Visa , Mastercard, American Express, and Discover
Create the following entries for each payment card
AMEX American Express ZCCARD_CHECK_AMEX Month
DC Discover Card ZCCARD_CHECK_DC Month*****
MC Mastercard ZCCARD_CHECK_MC Month
VISA Visa   ZCCARD_CHECK_VISA Month
The Routines can be created based on the original routines delivered by SAP.
*****SAP does not deliver a card check for Discover Card. We created our own routine.
Define Card Categories
Transaction:
Tables: TVCTY
Action: Define the card category to determine if a
payment card is a credit card or a procurement card.
Create the following two entries
Cat Description One Card Additional Data
CC Credit Cards No-check No-check
PC Procurement Cards No-check Check
Determine Card Categories
Transaction:
Tables: TVCTD
Action: For each card category map the account number range to a card category. Multiple ranges are possible for each card category or a masking technique can be used. Get the card number ranges from user community. Below is just a sample of what I am aware are the different types of cards.
Visa Credit Expires in 7 days.
    400000   405500
    405505   405549
    405555   415927
    415929   424603
    424606   427532
    427534   428799
    428900   471699
    471700   499999
Visa Procurement Expires in 7 days.
    405501   405504
    405550   405554
    415928   415928
    424604   424605
    427533   427533
    428800   428899
Mastercard Credit Expires in 30 days
    500000   540499
    540600   554999
    557000   599999
Mastercard Procurement Expires in 30 days
    540500   540599
    555000   556999
American Express Credit Expires in 30 days
    340000   349999
    370000   379999
Discover Card Credit Expires in 30 days
    601100   601199
Set Sales Documents to accept Payment Card Information Transaction:
Tables: TVAK
Action: Review the listing of Sales Document types and enter 03 in the column labeled PT for each type which can accept a payment card
Configuration for Authorization Request
Maintain Authorization Requirements
Transaction: OV9A
Tables: TFRM
Action: Define and activate the abap requirement that determines when an authorization is sent. Note that the following tables are available to be used in the abap requirement (VBAK, VBAP, VBKD, VBUK, and VBUP).
Define Checking Group
Transaction:
Tables: CCPGA
Action: Define a checking group and enter the
description. Then follow the below guidelines for the remaining fields to be filled.
AuthReq Routine 901 is set here.
PreAu If checked R/3 will request an authorization for a .01 and the authorization will be flagged as such. (Insight does not use pre-authorization check).
A horizon This is the days in the future SAP will use to determine the value to authorize
(Insight does not use auth horizon period).
Valid You will get warning message if the payment card is expiring within 30 days of order entry date.
Assign Checking Group to Sales Document
Transaction:
Tables: TVAK
Action: Assign the checking group to the sales order types relevant for payment cards
Define Authorization Validity Periods
Transaction:
Tables: TVCIN
Action: For each card type enter the authorization validity period in days.
AMEX American Express 30
DC Discover card 30
MC Master card 30
VISA Visa   7
Configuration for clearing houses
Create new General Ledger Accounts
Transaction: FS01
Tables:
Action: Two General Ledger accounts need to be created for each payment card type. One for A/R reconciliation purposes and one for credit card clearing.
Maintain Condition Types
Transaction: OV85
Tables: T685
Action: Define a condition type for account determination and assign it to access sequence A001
Define account determination procedure
Transaction: OV86
Tables: T683 / T683S
Action: Define procedure name and select the procedure for control. Enter the condition type defined in the previous step.
Assign account determination procedure
Transaction:
Tables:
Action: Determine which billing type we are using for payment card process.
Authorization and Settlement Control
Transaction:
Tables: TCCAA
Action: Define the general ledger accounts for reconciliation and clearing and assign the function modules for authorization and settlement along with the proper RFC destinations for each.
Enter Merchant IDs
Transaction:
Tables: TCCM
Action: Create the merchant ids that the company uses to process payment cards
Assign merchant ids
Transaction:
Tables: TCCAA
Action: Enter the merchant ids with each clearinghouse account

Delta Sync taking too much time on refreshing of tables

Hi,
I am working on Smart Service Manager 3.0. I have come across a scenario where the delta sync is taking too much time.
It is required that if we update the stock quantity then the stock should be updated instantaneously.
To do this we have to refresh 4 stock tables at every sync so that the updated quantity is reflected in the device.
This is taking a lot of time (3 to 4 min) which is highly unacceptable from user perspective.
Please could anyone suggest something so that only those table get refreshed upon which the action is carried out.
For eg: CTStock table should get refreshed only If i transfer a stock and get updated accordingly
Not on any other scenario like the changing status from accept to driving or any thing other than stocks.
Thanks,
Star
Tags edited by: Michael Appleby

Hi fiontan,
Thanks a lot for the response!!!
Yeah!! I kow it's a lotta code, but i thought it'd be more informative if the whole function was quoted.
I'm in fact using the PrintWriter to wrap the BufferedWriter but am not using the print() method.
Does it save any time by using the print() method??
The place where the delay is occurring is the wile loop shown below:
            while(allitems.hasMoreElements()){
            String aRow = "";
                XDItem item = (XDItem)allitems.nextElement();
                for(int i =0 ; i < props.length; i++){
                     String value = item.getStringValue(props);
     if(value == null || value.equalsIgnoreCase("null"))
          value = "";
                         if(i == 0)
                              aRow = value;
                         else
                              aRow += ("\t" + value);
startTime1 = System.currentTimeMillis();
System.out.println("time here is--before-writing to buffer --out.flush() done: " +startTime1);
bufferWrt.write(aRow.toCharArray());
out.flush();//added by rosmon to check extra time taken for extraction//
bufferWrt.flush();//added by rosmon to check extra time taken for extraction//
bufferWrt.newLine();
startTime2 = System.currentTimeMillis();
System.out.println("time here is--after-writing to buffer : " +startTime2);
What exactly happens is that after a few loops it just seems to sleep for around 20 seconds and then again starts off and ............it goes on till the records are done.
Please do lemme know if you have any idea as to why this is happening !!!!! This bug is giving me the scare.
thanks in advance

Use of truncating table

Hi,
I'm using some temporary load tables which are populated with bulk data daily & data is deleted after processing.
During processing, I found that suddenly select statements became very slow inspite of very small data.
Then I ran truncate command on the table & the select queries became faster as were before.
Here I want to know the significance of running truncate on tables on a fixed time as there are tables in production which are being populated & deleted daily but never truncated.
As truncate directly pulls down the water mark to 0, is there any option to do so using delete+commit?
Thanks
Deepak

If you have temporary tables, you would generally want to declare them as GLOBAL TEMPORARY tables rather than declaring them as permanent tables. Life is generally much easier that way.
If you do require permanent tables with transient data, you would need to use DDL to reset the high water mark, and TRUNCATE is the easiest option on that front. You may, however, be able to simply gather/ set statistics on the object that reflect the actual data volume to avoid any performance problems. Resetting the high water mark will only affect the performance of full table scans, but the CBO may choose full table scans less frequently if it has appropriate statistics on the table.
Justin

Truncate table will delete the corresponding LOB segment of table or not ?

Hi All,
I have few table with LOB segments, if i fire the truncate table on those table will it purge the LOB segment as well ?
Approximately how much time will take to truncate 100gb LOB segments.
Thanks

903787 wrote:
Hi ,
1.Truncate will delete the LOB segment or not ?It won't delete the LOB segments but it should release most of the allocated space.
>
2.To reclaim space we need to run the below command, is it correct ?
ALTER TABLE <table_name> MODIFY LOB (LOB_COLUMN) (SHRINK SPACE);
Should not be needed in 11.2:
SQL> select * from v$version;
BANNER
Oracle Database 11g Express Edition Release 11.2.0.2.0 - Production
PL/SQL Release 11.2.0.2.0 - Production
CORE    11.2.0.2.0      Production
TNS for 32-bit Windows: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Production
SQL> select count(*) from user_segments;
COUNT(*)
         0
SQL>
SQL> create table t(x clob);
Table created.
SQL> select segment_name, segment_type, bytes
2 from user_segments;
SEGMENT_NAME                             SEGMENT_TYPE            BYTES
T                                        TABLE                   65536
SYS_IL0000030908C00001$$                 LOBINDEX                65536
SYS_LOB0000030908C00001$$                LOBSEGMENT              65536
SQL>
SQL> insert into t select lpad(segment_name,8192) from dba_segments;
6312 rows created.
SQL> commit;
Commit complete.
SQL>
SQL> select segment_name, segment_type, bytes
2 from user_segments;
SEGMENT_NAME                             SEGMENT_TYPE            BYTES
T                                        TABLE                  393216
SYS_IL0000030908C00001$$                 LOBINDEX                65536
SYS_LOB0000030908C00001$$                LOBSEGMENT           53477376
SQL>
SQL> truncate table t;
Table truncated.
SQL>
SQL> select segment_name, segment_type, bytes
2 from user_segments;
SEGMENT_NAME                             SEGMENT_TYPE            BYTES
T                                        TABLE                   65536
SYS_IL0000030908C00001$$                 LOBINDEX                65536
SYS_LOB0000030908C00001$$                LOBSEGMENT              65536
SQL>
SQL> alter table t modify lob(x) (shrink space);
Table altered.
SQL>
SQL> select segment_name, segment_type, bytes
2 from user_segments;
SEGMENT_NAME                             SEGMENT_TYPE            BYTES
T                                        TABLE                   65536
SYS_IL0000030908C00001$$                 LOBINDEX                65536
SYS_LOB0000030908C00001$$                LOBSEGMENT              65536
SQL>

ORA-01502: Index or Partition is in unusable status. while truncating table

Hi All,
One of our Devlopers compalined that he is getting ORA-01502 : Index or partition is unusable status while truncating the a table in our Dataware house production database. He is using the following commands.
Alter index <index_name> unusable;
Truncate table <table_name> ;
He is running a scripts to truncate each table and ecah time he is passing the table name as an input parameter to script. He is using same method to truncate four tables each having a BITMAP and a REGULAR index. For two tables every thing is working fine, but for other two tables the he is getting ORA-01502 for BITMAP indexes. It a weekly process and every week he is getting the same issue. I checkd the Index status, they are in valid status only.
For a work around I have created a table with BITMAP and regular index in our dev database. made the indexes unusable, checked their status. I truncated the table. Importent thing here is the Indexes are becoming vaild when I truncate the table.
I suspect that my devloper's Indexes were already in unusable status (before he use the command ALTER INDEX), when he truncated the table, oracle trying to validate the index and throwing the error ORA-01502 because the Indexes are in unusabel statsu for a while.
I tried searching for the mechanism of truncate table command and its effect on Indexes. But I did not find any luck, no one is speaking about index when truncating the table. Can any one please help me????
Sorry for lengthy post. Any help is greatly appriciated and I thank every one in advance.

DDL for Indexes getting ORA-01502 error
CREATE BITMAP INDEX DWHMGR.ACT_TXN_LN_STG_01_XN3 ON DWHMGR.ACCT_TXN_LINE_TERM_BAL_STG_01 (TERM_BAL_CD ASC) TABLESPACE "BALFD_INX_04" NOLOGGING PCTFREE 1 INITRANS 2 MAXTRANS 255 STORAGE
( INITIAL 8M NEXT 8M MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 BUFFER_POOL DEFAULT );
CREATE BITMAP INDEX DWHMGR.ACCT_TERM_BAL_STG_01_XN3 ON DWHMGR.ACCT_TERM_BAL_STG_01 TERM_BAL_CD ASC) TABLESPACE "BALFD_INX_04" NOLOGGING PCTFREE 1 INITRANS 2 MAXTRANS 255 STORAGE
( INITIAL 8M NEXT 8M MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 BUFFER_POOL DEFAULT );
Indexes that have no issues.
CREATE INDEX DWHMGR.ACCT_TERM_BAL_STG_01_XN2 ON DWHMGR.ACCT_TERM_BAL_STG_01 (ACCT_REF_NB ASC) TABLESPACE "BALFD_INX_04" NOLOGGING PCTFREE 1 INITRANS 2 MAXTRANS 255 STORAGE (INITIAL 8M
NEXT 8M MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 BUFFER_POOL DEFAULT );
CREATE BITMAP INDEX DWHMGR.ACCT_PRC_STG_01_XN1 ON DWHMGR.ACCT_PRC_STG_01 (ACCT_ORG_CD ASC) TABLESPACE "BALFD_INX_04" NOLOGGING PCTFREE 1 INITRANS 2 MAXTRANS 255 STORAGE ( INITIAL 8M
NEXT 8M MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 BUFFER_POOL DEFAULT );
Please look at the DDL of the indexes and let me know if you need any other information.

Query Execution time - Elapsed time v Actual time taken

Hi All,
I have this scenario where I am querying a single table with the following results. It is a very heavy query in that there are multiple aggregate functions and multiple unions on it. Even if the query is written poorly (i doubt it is) why would the actual
time taken to execute the query be much more than the statistics provided through the following commands?
SET STATISTICS IO ON;
SET STATISTICS TIME ON;
Attached are the stats provided for the relevant query in question.
Table '123456789_TEMP_DATA'. Scan count 178, logical reads 582048, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
SQL Server Execution Times:
CPU time = 936 ms, elapsed time = 967 ms.
2014-01-06 17:36:41.383
Now, although the CPU Time/Elapsed time shows that it takes less than a second, it actually takes more than 15 seconds to fetch the results. (This is the actual time that you get on the bottom bar of the Query pane as well.)
What is the reason? Why is it that there is such a big discrepancy between the numbers? How can I improve this situation?
Thanks!

Yes. I am returning a huge number of rows to the client.
The query is simply against a single table.
Select
'First Record',AVG(COLUMN1),STDEV(COLUMN1
),COUNT(COLUMN1)
FROM [TABLE1] WHERE (SOME CONDITION)
UNION ALL
Select 'Second Record',AVG(COLUMN2),STDEV(COLUMN2),COUNT(COLUMN2) FROM [TABLE1]
WHERE (SOME OTHER CONDITION)
Imagine there are 178 records fetched in this manner with 178 UNIONs. The WHERE clause will always change for each SELECT statement.
Now, the question is not so much about the query itself, but why the execution time is actually 15 seconds whilst the SQL STATISTICS show it to be 936ms (<1 second)
Thanks!

Can grant truncate table permission to a user?

Whether can grant truncate table permission to a user separately.
I know that the role db_ddladmin can do,but the create,alter and drop permissions will be granted the same time(These permissions are not what we want to
grant to user).
Is there any solution?
Best regards!!
If you haven't all the things you want,be grateful for the things you don't have that you didn't want.

You can't grant truncate because for whatever reason, that permission doesn't exist. What you can do is use a stored procedure and use EXECUTE AS OWNER to get around it.
create database foo
go
create login foobar with password = 'alkdsfji9eorngv';
go
use foo
go
create user foobar from login foobar;
go
create table test(rowid int identity)
go
insert into test default values;
go
select * from test
go
create procedure dbo.truncate_test
with execute as owner
as
truncate table test
go
grant execute on dbo.truncate_test to foobar
go
execute as login='foobar'
execute dbo.truncate_test
revert
go
select * from test
go
use master
go
drop database foo
drop login foobar
This keeps your database safe and allows you to grant execute on the truncate procedure to allow them to truncate the table.Jonathan Kehayias
http://sqlblog.com/blogs/jonathan_kehayias/
http://www.twitter.com/SQLSarg
http://www.sqlclr.net/
Please click the Mark as Answer button if a post solves your problem!

Time taken in each section of Mapping

Hi All,
One of my mappings is taking a very long to execute in production db. Is there anyway/ any table which lets me view the times taken for each step in the mapping?
I tried to use Debug mode by opening the mapping in OWB but the debug mode is a lot slower than the mapping itself when deployed - hence i am not able to know accurately where the actual problem might be.
thanks.

Hi
The OWB browser has runtime reports that will let you see the steps and timings.
There are a bunch of reports in the blog here on the runtime audit tables that you can use in SQLDeveloper, or just rip off the SQL;
http://blogs.oracle.com/warehousebuilder/2010/10/owb_sql_reports_in_code_samples.html
Download the zip, either use SQLDev with the reports or take the file OWBReports.xml and look at the SQL in it and use wherever.
Cheers
David

Time taken for HANA System to become available after a System restart for continuing transaction (in ERP on HANA)

Hi HANA Gurus,
Would like to know in a normal system replication based HA for SoH, without memory preload, after an automatic failover to the second node,in how much time HANA becomes available for the SoH(ERP) users to continue transaction. Consider an ideal scenario with 512 GB appliance , with allocation limit of 490GB approx., considering normal 90% of first 64gb and 97% of every further 64GB memory on the single host. Also consider a used memory of say 128 GB(indicating database size and considering no custom configuration for specific tables preload .Consider the save point is every five minutes as default and committed transactions are written to the log. Host is replicated to second node using HANA System replication and with HANA automatic failover option. This means on first node failure the HANA system will be restarted on second node and data will be loaded to the memory based on the last state in the other node. As I understand the save points are loaded, logs are applied and database become available for users, the lazy load continues etc. Kindly answer me if anyone knows by experience how much time it takes from the failure detection to next state of the system becoming available for user to start updating for example a Sales Order. Also like to know more about this start-up process to understand it better(for example the last save points are done by saving the changed pages, so time taken to load the last savepoint pages to memory, then applying transactions from last save point (last 4 minutes for example before failing over etc). The purpose is to understand whether the failover time from Primary to standby takes similar time like a traditional db (for example db2) or more due to memory load time in HANA. At the same time I am aware of other options available to reduce the RTO by using memory preload, cluster solutions from vendors , OS like SUSE etc.
Thanks in advance.
Rajesh Vikraman

Hi John
My question is specific to a system failover which is not replication with memory preload, where you require cluster software to do the failover. My question is in case of a automatic failover configuration using a standby node . For example gpfs / hana automatic failover option, where standby note starts hana, and loads last savepoint , applies logs and then start lazy loading.
Regards

Time taken in 103 movement to 105 movement.

Hi,
I want to know that how much time taken in 103 movement to 105 movement.
We want how much time take to 105 after 103 movement. In which table we can find it..
Means: -
105 Document - 103 Document = Diff. Days
10.01.2010 - 01.01.2010 = 10 Days.
Edited by: @ABAP@ on Feb 24, 2010 9:10 AM

Hi,
When i insert the value in DATE1.. 01.01.2010 and in DATE2.... 10.01.2010 and output format default value is 01.
Output of Days are should 0..
You can add 1 to the result you are getting.
or try this FM SD_DATETIME_DIFFERENCE
but pass 00:00:01 in Seconds for both starting time and end time
Cheerz
Ram

How we can store start time & end time taken by execution of scenerio?

Hi
i want to store starting time and ending time taken by executing of any scenerio and date also on which scenerio will be executed.
plz assist me regards the same
thanks

when you say store , you want to capture in some file ,email or table.
If table , you can have a small sql linking SNP_SESSION and SNP_SCEN and fetching the required detail accordingly.

How index affected by truncate table

HI, all,
I have a question about indexes in a table. If I truncate the table and reload data, do the indexes in the table still valid?
From documentation:
a table is truncated, all associated indexes are also truncated.
What does that mean?
Do I need to recreate index every time I truncate table?
Thanks a lot.

When you truncate a table, you are removing all the data from the table but leaving the structure of the table intact. Logically, the same thing must happen to the index-- all the index data must be removed (since there are no longer any entries in the table), but the structure of the index remains intact.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

How truncate table affect index?

HI, all,
I have a question about indexes in a table. If I truncate the table and reload data, do the indexes in the table still valid?
From documentation:
a table is truncated, all associated indexes are also truncated.
What does that mean?
Do I need to recreate index every time I truncate table?
Thanks a lot.

No, it's just what it says: it truncates the index, just like it truncates the table. You do not have to recreate the table, nor the index.
Truncating is deleting without the possibility of a rollback.

Time taken to truncate table

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