Date To Timestamp Conversion Of Column With 150 Million Rows?
Oct 5, 2010
Due to some business requirements a table field needs to change from date to timestamp in order to handle the millisecs.
1>When i alter the row , for a table with 150 million recs will there be a conversion. Is there a recommended way to convert the field. Mind you this field is used as a part of composite PK.
2> There is a interfacing application which connects and copies the data to its system and is using the date type, will that application be able to continue to work without any changes, if it does not care about the millisecs.
3> Will there be performance impact on an existing application that uses the date field to sort
I huge table with million of rows and no of column more than 300.. is it possible to keep this table in some memory where oracle can access it fast as compare to disk memory.
trying to update a column in a table which has 3 columns of 16million rows from column in another table which has 1million rows, there is no relationship between the 2 tables.
Table A has 3 columns of 16million rows, the first two columns have 16million ID numbers, the 3rd colunm is currently NULL.
Table B has 1million Numbers, i need to somehow update column 3 in table A using the numbers in table B, it doesnt how many times each of the 1 million numbers are used but i dont want it to just update every row to the same value.
I want to write a query to get the time stamp from only one date column,
I tried using a group by clause but getting error "not a group by exp."
Below is the query
SELECT ProdID,ProdRequestID, SUBSTR((max(EVENTTIMESTAMP) - min(EVENTTIMESTAMP)), 18,2)Execution_Time FROM LOG_TIMESTAMPS where ProdID = 1680988889 group by ProdRequestID ProdID||ProdRequestID ||EVENTTIMESTAMP
[code]....
In the above i am looking for a diference on ProdRequestId,
We have two tables, TableA and TableB that contain list of accounts and balances.The requirement is to compare the balances of accounts in both the tables, and if there is a difference, then record that difference with account number in another table.
Both TableA and TableB contain more than 10 million rows.What is the best way to do this task in PL/SQL? A join on TableA and TableB to know the differences has become very slow due to large volume.
From ETL to Oracle, I have stored the timestamp in varchar2 as '30-MAY-11 06.30.00.000000 PM'. Now I need to convert this varchar2(timestamp format) to date. I used:
select TRUNC('30-MAY-11 06.30.00.000000 PM','dd/mm/yyyy hh24:mi') from dualBut, it doest work. get date format?
I am trying to find sum for one record for each partition but while taking that timestamp giving me bit trouble, i have tried to reproduce the table and some little data
CREATE TABLE TEST_COUNT (END_TIME DATE ,SUCCESSFUL_ROWS NUMBER ,FAILED_ROWS NUMBER ,TBL_NAME VARCHAR (4) ,PARTITION_NAME VARCHAR (240) )
select a.EV_ACTOR_NAME, round((b.total_transfer/(24 * a.Max_Throughput)) * 100) AVG_ThroughPut,round(((b.total_transfer/a.Max_Throughput) * 100 )) MAX_Throughput from (select distinct EV_ACTOR_NAME,((max(EV_TRANSFER_RATE) over ( partition by EV_ACTOR_NAME)) * 60 * 60) /1024 Max_Throughput from dprt_events where EV_ACTOR_NAME is not null ) a, (select distinct EV_ACTOR_NAME, (sum(EV_TRANSFER_SIZE) over( partition by EV_ACTOR_NAME)/1024/1024/1024) total_transfer from dprt_events where EV_ED_ID in (40,105,112) and EV_END_TIME between (sysdate - 20) -12/24 and sysdate - 20) b where a.EV_ACTOR_NAME = b.EV_ACTOR_NAME
I have employees under a supervisor defines as below:
select LOGIN_USER_ID from APPWMS.VIEW_EMP_LATEST_INFO where SPVSR_LOGIN_USER_ID='erbrand' and EMP_STAT_CODE='ACTIVE'
Now I need to determine if all above employees are clocked in , clocked out or not clocked between yesterday and today using following:
select to_char(CLOCK_IN_DATE,'dd-mon-yyyy hh24:mi:ss' ) ClockIn,to_char(CLOCK_OUT_DATE,'dd-mon-yyyy hh24:mi:ss' ) ClockOut ,LOGIN_USER_ID,--CLOCK_IN_DATE,CLOCK_OUT_DATE, CLOCK_OUT_DATE-CLOCK_IN_DATE,trunc(sysdate) , trunc(sysdate-1), case when CLOCK_OUT_DATE is null then 'Not clocked out' else
[code]....
The first SQL gives me 66 rows while second gives me 40 rows. For 26 people , no rows are returned which means these people donot have a clock in record between two timestamps.
How can we modify query to show those 26 people as 'Not clocked In'
I get data from one table into a gridview and one of the columns is a date. I get it with date and time stamp but I want solely the date in my gridview.
We have to load 10 million rows in a table from another table based on the multiple joins. How much tablespace size we allocate to the table and for performance point of view how much should be the SGA size.
I have to use the "4*3600" in order to get the date to show up correctly, but even then the date sometimes comes up wrong. If the date occurs in the morning, then the date shows up as the previous day. I am sure this is probably due to the offset I am adding in the above formula. If I don't add the 4 hour offset, then the date shows up 4 hours off.
I want to change a table datatype from date to number where already existing data should get convert.any possibility of doing where i tried like this but no get changing. Even as Julian format is working a bit i want the data to come as GMT format
Scenarios where i tried are like this.
ALTER TABLE Contacts ADD ALERT_DATE1 NUMBER(20,0) / UPDATE Contacts SET ALERT_DATE1 = TO_NUMBER(ALERT_DATE) / ALTER TABLE Contacts DROP COLUMN ALERT_DATE / ALTER TABLE Contacts RENAME COLUMN ALERT_DATE1 TO ALERT_DATE /
but second statement failing.
Julian fomat like
SELECT sysdate, TO_CHAR(sysdate, 'J'), TO_DATE(TO_CHAR(sysdate, 'J'),'J') FROM dual;
I am converting data from an old paradox table to a new oracle table, one of the problems im having is incompatibility with date and time formats:
some columns contain times in the format : "00:00:00" eg..... "15:00:00" some columns have date in the format: "dd/mm/yyyy" eg....... "21/08/2000" some columns have time and date eg.. "05/09/2000 15:49:39"
Currently I have the data held in tables within an access database, and in CSV format.
eg, I have dates like 03/04/2010 which i need to be 03-APR-10....
how I can get the following into Oracle date formats? there is over 1000 records so manual conversion is out of the question
I recently became involved with databases, and i've came across with a little obstacle. I have strings that represent a date, they are very oddly formatted and need to store them as dates. the string format looks like this: 'Monday, May the 13th of 2001'
I have been given some data in excel sheet to be uploaded in an Oracle Table. The dates are in Julian. The date in Julian in excel sheet is as :-'110048'.
In the excel file, I found that the cell was formatted as General and when I changed the formatting to Date I got the result as '19/04/2211'.
tell me a way to convert this Julian to mm/dd/yyyy format to be inserted into a table in Oracle.
Tried this :-
SQL> SELECT to_char(to_date(to_char(110048), 'J'),'DD/MM/YYYY') FROM dual;
create table sand_program1(prog_code varchar2(20), filing_date number(15)); Result : Both the tables are created.
Now I create a procedure below as mentioned, to check if the filing_date is greater than the prog_end_dt or not.If the filing_date is greater than prog_ end_dt, then it should go to the 1st "dbms_output.put_line" message else it should go to the 2nd "dbms_output.put_line" message.
Here's my procedure:
create or replace procedure test_sand(p_program_cd in number) is v_prog_end_dt date; v_filing_date number; begin [code]....
#runs the selected process ${ORACLE_HOME}/bin/sqlplus -s ${USER_PASS} >${TMP_FILE} <<EOF set pause off set verify off set pagesize 0 set linesize 2000 set timing off [code].........
I am passing a Date to the Oracle Procedure in `date +'%b_%d-%H:%M:%S'` format.
