Why A Certain Date Makes Query Faster
May 25, 2012
I have a query with a few tables in join, and I filter data with something like
where mytable.initial_date > sysdate-30
If I use any date, it takes about 5 seconds to run, but if I use
to_date('01010001','ddmmrrrr')
instead of any other dates, it takes just a few milliseconds. Now, it's just a curiosity, but why that date makes the query VERY fast? Does Oracle treat it in some special way? Maybe it knows every date is greatest than that date and doesn't consider the filter?
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Feb 21, 2013
I have a query optimized as to it indexes and others runs immediately when the answer is few records in SQL Server such as Oracle, however when the result is large eg 20,000 records all data access times are very diferent. The query returns many fields (about 20) and some of them are of type Varchar 250 and some of 2000 I understand here may be the problem, but not is because for similar results (20,000 records) sql run in 2 seconds and Oracle but it responds little to have full data takes around 30 seconds. The problem is really in bringing information to all these fields since if the inquiry it also but only returning a numeric field is done in 2 seconds. Tests I've done them both through ODBC, in the Toad as in the own Oracle console on the server, so it is not problem Driver or flow of data through the network, I would like to think that this is some of the settings I think there is as much difference between Oracle and Sql. The databases are ORACLE 10 and SQL Server 2008.
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May 12, 2011
I am using 10g and want to let an user to delete a single record from a multirow form via delete button. This button is supposed to do the same, what the "delete record" button on the default menu does. (I want a custom menu, so I can't use that button)
My delete button ist assigned to a control-block and the when-button-pressed-Trigger of that button looks like this:
-------------
DECLARE
TEMP VARCHAR(30);
BEGIN
-- Record chosen?
IF :<BLOCK>.ID IS NOT NULL THEN
[Code]...
The problem is, that the alert asks the user about the previously chosen record correctly, but if the user clicks BUTTON1 the Form says: No changes to save (FRM-40401).
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Apr 15, 2010
I have created a MV joining 10 tables with FAST REFRESH ON COMMIT It made my sytem very slow.
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Oct 24, 2013
When I run a query form the the Query Window in Visuial Studios 2012 all the date fields truncated to 'mm/dd/yyyy', but i need the full date returned. I am able to get full date from TO_char(MyDateField, 'yyyy-mm-dd hh24:mi:ss'), but if I do TO_DATE(MyDateField, 'yyyy-mm-dd hh24:mi:ss') it only returns 'mm/dd/yyyy'. I'm sure this is a simple setting in Visual studios but I cant find it to save my life. Is there there a way to have the full date returned by default?
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May 23, 2013
mucking on an Oracle 11.2 database, simple range partitioning issue. Seems using a "complex" formula inside the AT clause annoys it? Or am I doing something wrong?
I create the table with RANGE partition just fine:
CREATE TABLE my_part_tab
( id number,
sdate date
)
PARTITION BY RANGE ( sdate )
( PARTITION P2013Q1 VALUES LESS THAN ( TO_DATE('01-jan-2013','dd-mon-yyyy') ),
PARTITION P2013Q2 VALUES LESS THAN ( TO_DATE('01-jul-2013','dd-mon-yyyy') ),
PARTITION P2013Q3 VALUES LESS THAN ( TO_DATE('01-oct-2013','dd-mon-yyyy') ),
[code]...
Table created.(and yes, I'm aware of INTERVAL option that'll do this next part "automagically", however, INTERVAL and REFERENCE partitioning are incompatible, and the child table is using REFERENCE partition). to make things easier on DBA for future, I'm trying to create a script that makes added a year's worth of partitions less manual.So far, I have the following working:
ACCEPT lYear PROMPT "Add Paritions for which calendar year?"
ALTER TABLE my_part_tab SPLIT PARTITION PMAX
AT ( TO_DATE('01-apr-&lYear','dd-mon-yyyy') ) INTO ( PARTITION P&lYear.Q1,PARTITION PMAX );
ALTER TABLE my_part_tab SPLIT PARTITION PMAX
AT ( TO_DATE('01-jul-&lYear','dd-mon-yyyy') ) INTO ( PARTITION P&lYear.Q2,PARTITION PMAX );
[code]...
But no luck ...Same issue with other variations:
ALTER TABLE my_part_tab SPLIT PARTITION PMAX
AT ( (ADD_MONTHS(TO_DATE('01-jan-&lYear','dd-mon-yyyy'),12)) ) INTO ( PARTITION P&lYear.Q4,PARTITION PMAX );
ALTER TABLE my_part_tab SPLIT PARTITION PMAX
AT ( (TO_DATE('01-jan-'||TO_CHAR(TO_NUMBER('&lYear')+1,'fm9999'),'dd-mon-yyyy')) ) INTO ( PARTITION P&lYear.Q4,PARTITION PMAX );
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May 11, 2011
Lets say the contents of the table are like this -
key dte_start(number) dte_end(number)
1 20010101 20011231
1 20020101 20081231
1 20030601 20071231
1 20100101 20101231
2 20090101 20091231
2 20090401 20101231
2 20101231 20111231
2 20140101 20141231
3 20080101 20091231
3 20070101 20081231
3 20100101 20101231
3 20120101 20120630
I want the query to resolve overlapping dates as well as merge contiguous segment and leave non-contiguous segments as is. The final result of the query should be like this.
key dte_start(number) dte_end(number)
1 20010101 20081231
1 20100101 20101231
2 20090101 20111231
2 20140101 20141231
3 20070101 20101231
3 20120101 20120630
I tried using the lead over partition along with the standard overlap query and case logic to get the results but couldn't get it to work.
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Nov 9, 2010
i have table (MEN) with 900,000 records.in this table i have field `IP` and `Tdate`.when i run query:
select * from MEN where IP = '1.1.1.1' and Tdate = TO_DATE('07/04/2010', 'DD/MM/YYYY')
it takes long time until i get Result.i try to make index like this:
create index
my_in
on
MEN (IP,Tdate );
but how to run the query to get fast Result?i try this:
select My_in from MEN where IP = '1.1.1.1' and Tdate = TO_DATE('07/04/2010', 'DD/MM/YYYY')
and get error: `ORA-00904`
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Jul 8, 2012
I have a table with 80 million records. Is dropping this large table is faster or truncating is faster?
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Aug 8, 2012
Version : 11.2 on Solaris, AIX
All our production DBs are backed up by some Hitachi tool (apparently it is called ShadowImage) . Apparently they put all the tablespaces in Backup mode and 'take a snap' . Our BAU team says this is faster.
On an event of DB Crash Is it easier to restore, recover from these 'snapshots' ? Are these snapshots much faster than RMAN ?
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Jan 15, 2013
I have been using With for many queries for readability. This most recent query seemed to be taking a bit longer to run and I didn't think much of it until a colleague showed me their version (totally different sql statement) which ran faster, but seemed more complicated and had more lines of code. I noticed that the other version did not use with. I moved the sql of the with into the join and the query ran faster dropping from 30 seconds to 798 msecs. The question is am I sacrificing speed for readability by using With, or it really depends on the overall sql statement.
Here is the query using WITH:
with prev as
(
select person_uid, id, name, academic_period,
case when enrolled_ind = 'Y' and registered_ind = 'N' and student_status = 'AS' then 0 else 1 end as enreg_stat,
[Code]....
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Nov 25, 2012
How to get the payment date less than the sch date?
example:
1) for 07/24/2012 sch date the nearest payment date is 07/27/2012.
sch date should be less than the payment date.
Sch dates 07/24/2012 and 07/26/2012 are less than payment date 07/27/2012 but we take the least one.
2) sch date 07/27/2012 is less than the payment date 08/08/2012 so 07/27/2012
Below is the scripts and output needed.
create table cust_sch_tbl
(
customer_NUMBER number,
c_CODE char(5),
sch_DATE date
);
[Code]...
Output needed:
cust cust code payment date sch date
4611 c1 7/27/2012 7/24/2012
4611 c1 8/8/2012 16:57 7/27/2012
4611 c1 10/19/2012 16:37 10/11/2012
4611 c1 11/15/2012 10/30/
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May 24, 2012
We need to setup a test system using data from one of the offsite customer location.The option we would like to use is impdp with network link. Below given step will make import faster if we exclude indexes and constraints
Steps
Import schema excluding constraints,rf_constraints,indexes with metadata only
Import schema with data only
spool ddl using dbms_metadata.get_ddl from Source for constraints,rf_constraints and indexes
execute on Destination the Index creation ddl
execute on Destination constraints and rf_constraints ddl
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Apr 30, 2011
We have one oracle table, which has one column "Creation_Date" of the datatype date.
This column has data like
"14-Aug-2010 01:30:30"
"14-Aug-2010 03:30:30"
"15-Aug-2010 01:30:30"
"16-Aug-2010 01:30:30"
"16-Aug-2010 03:30:30"
We want to write SQL query which will group rows by date wise without considering time..I mean for above rows the date wise output should be
Count Date
------- -------
2 14-Aug-2010
1 15-Aug-2010
2 16-Aug-2010
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Feb 20, 2012
i have a view in a schema of my database 'vw_get_noti_calendar_data' and i want to select some field but it shows an error 'invalid number' and i have observed it but no effect,so where is the error.
my code is---------
SELECT *
FROM aepuser.vw_get_noti_calendar_data
WHERE TO_DATE (TO_CHAR (event_start_date, 'mm/dd/yyyy'), 'dd/mm/yyyy')
BETWEEN TO_DATE (TO_CHAR ('2/28/2012', 'mm/dd/yyyy'), 'dd/mm/yyyy')
AND TO_DATE (TO_CHAR ('2/28/2012', 'mm/dd/yyyy'), 'dd/mm/yyyy')
AND srnum BETWEEN 5 * 1 + 1 AND 5 * 1 + 5;
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Nov 5, 2010
building SQL query to get the result as shown below.
Create Table Temp
CREATE TABLE TEMP
(
CASEID NUMBER,
SATUS VARCHAR2(1 BYTE),
TRANS_DATE DATE
)
Insert data
[Code]...
I want to build a query which should give output as shown below. Basically i want to select those rows which having minimum trans_date for a given CASEID & Status.
OUTPUT:
CASEIDSATUSTRANS_DATE
100A11/02/2010
100B11/07/2010
100A11/12/2010
200A11/02/2010
200B11/07/2010
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May 6, 2010
query only specific date only. example: '06-MAY-2010'.
1.from the statement below, it will display out more than 06-mAY-2010.
2.if i want more the date from 03-MAY-2010, 04-MAY-2010 and 05-MAY-2010.
select * from PNG_ORA_SERVER_PERF where SERVER_NAME = 'MLYDESPINTF1' and DATE_TIME >= TO_DATE('06-MAY-2010','DD-MM-YYYY');
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Apr 19, 2013
Create table time_in (
Emp_id varchar2(6),
at_date date,
time_in varchar2(6),
status varchar2(2)
)
[Code]....
-------------- required restul----------
emp_id at_date time_in at_date time_out
------ ------- ------- -------- --------
00009 16/03/2013 09:47 17/03/2013 09:45
00009 17/03/2013 09:48 17/03/2013 10:43
00009 18/03/2013 09:57
00009 19/03/2013 09:38 19/03/2013 05:22
00009 20/03/2013 09:48 20/03/2013 05:24
status 01 = time in
status 02 = time out
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May 17, 2013
Restarting oracle services through services.msc is faster then manual (In command prompt).
Even If we have heavy transaction on the oracle database But we can restart the database within minutes by using services.msc But It will take more time in command prompt(sql>shu immediate). So shall we assume here that services.msc is using shut abort command while restarting the database?
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Oct 27, 2008
I want a monthly report where the month wise sum of qty should be displayed in a row for last 12 months. I need to specify the month start date and end date in the query to pick the sum for the particular month. How can i do it in a SQL query?
SUM(decode(to_char(t1.trx_date,'mm/rrrr'),
to_char(add_months(SYSDATE,
-1),'mm/rrrr'),
nvl(t2.quantity_invoiced,
0))) AS qty_01
from t1,t2
where t1.col1=t2.col1
instead of sysdate i have to use start and end of month. Also i am using group by clause on some columns.
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Apr 10, 2013
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,
Output
ProdIDProdRequestIDEVENTTIMESTAMP
16809888892013-04-09T02-56-34.5025kqcxy03
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May 19, 2011
TABLE - 1
CIDDOB(DATE)
12312-MAR-63
58918-JAN-78
658927-DEC-43
46515-FEB-80
TABLE - 2
DIDDOB_INFO(VARCHAR2)
34425 Mar 1967
123 12 MAR 1963;25 FEB 1974;25 AUG 1978
46515 FEB 1980
I want to join the columns DOB from table -1 and DOB_INFO from table 2 but the datatype of DOB is DATE and DOB_INFO is VARCHAR. TO_DATE function is not working here.
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Jul 2, 2013
My table has two date columns EFF_DT which is the start date and TERM_DT is the end date. The EFF_DT of the next record should be the next date of the TERM_DT record.
My table looks like this.
Input Table:
-----------
CK_IDPI_IDEFF_DT TERM_DT
Mem1ABC1-Jan-1331-Mar-13
Mem1ABC1-Apr-1331-May-13
Mem1ABC1-Jun-1330-Sep-13
Mem1ABC15-Oct-1331-Dec-13
Mem1ABC1-Jan-1431-Mar-14
Mem1XYZ1-Apr-1430-Jun-14
Mem1XYZ1-Jul-1431-Dec-14
Expected Output:
----------------
CK_IDPI_IDEFF_DT TERM_DT
Mem1ABC1-Jan-1330-Sep-13
Mem1ABC15-Oct-1331-Mar-14
Mem1XYZ1-Apr-1431-Dec-14
In the fourth record, the effective date should be 1-Oct-13 which is the next date to the last TERM_DT 30-Sep-13.As the is the break in the date, the output should show 15-Oct-13 sa the second start date.
Note: Refer to the PI_ID columns, there is a break in the date for the sale PI_ID 'ABC'.
Here I am trying to generate a pseudo column, so that the table with the pseudo column looks like as shown below. and I can use first_value and LAST_value by partitioning on the pseudo column to get the desired output.
1) CNT_VAL is the pseudo column:
-----------------------------
CK_IDPI_IDEFF_DT TERM_DT CNT_VAL
Mem1ABC1-Jan-1331-Mar-131
Mem1ABC1-Apr-1331-May-131
Mem1ABC1-Jun-1330-Sep-131
[code].....
My Query :
----------
I not getting the desired output here as the value in pseudo column is 3.
select CK_ID, PI_ID,EFF_DT,TERM_DT,
(case
when case_CONT - LAG(case_CONT,1) over (ORDER BY EFF_DT) = 0 then to_char(case_CONT)
when case_CONT - LAG(case_CONT,1) over (ORDER BY EFF_DT) <> 0 then to_char(LAG(case_CONT,1) over (ORDER BY EFF_DT) + 1)
else to_char(nvl(case_CONT,0))
[code].....
Scripts:
--------------------
Create table lead_test(
CK_ID varchar2(10),
PI_IDvarchar2(10),
EFF_DTDate,
TERM_DT date);
[code].....
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Feb 21, 2011
I just want to calculate difference between two dates in YY MM DD HH:MI:SS format through a SQL Query (not function).
Sample data is as follows-
to_timestamp('11-Feb-2008 12:23:00','DD-MON-YYYY HH24:MI:SS')
to_timestamp('2-Dec-2010 04:23:22','DD-MON-YYYY HH24:MI:SS')
or
how to calculate age in YY MM Day HH:MI:SS format. Suppose my DOB is '2-Feb-1988 11:10:15 AM'
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Aug 14, 2013
I am trying to replace a date range in a query. Don't understand why it's not working, below is the dummy query for the same:
/* v_Employee:= 'select emp_name from employee_table where Join_Year=~Replace1~ and Release_Month <=~Replace2~';
v_Replace1:=2013;
v_Replace2:=7;
pos := 1;
WHILE (INSTR(v_Employee, '~', 1, pos) <> 0) LOOP
IF (pos = 1) THEN
[code]....
Since actual code is like CLOB type, so I have not provided the same. Here after executing this query i found that v_Employee query is getting replaced by v_Replace1 at both of his position i.e "select emp_name from employee_table where Join_Year=2013 and Release_Month <=2013"
But my actual result should: "select emp_name from employee_table where Join_Year=2013 and Release_Month <=7"
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Mar 13, 2009
i have project for hotel , i can't solve query to search empty room between date . i have table for room , when room record under reservation between date . then i want to found empty room between date, which is query to make do.
Table Room
Room_No
Type_Room
From_Date
To_Date
Status
Now i need to found empty room between date search room empty between
11/03/2009 - 13/03/2009
select Room_No from Room where From_Date Not between '11/03/2009' and '13/03/2009' i found hard to query.
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Aug 9, 2012
I want to get rows by latest date for each group pf rows.
say my data is :
TYPE1 TYPE2 quantity DATE-ORDERED
sweets chocolate 10 05-FEB-2012
sweets chocolate 10 04-DEC-2012
sweets chocolate 10 08-FEB-2012
pastries chocolate 20 08-AUG-2012
[Code] ..........
I want to get results by latest date,
sweets chocolate 10 04-DEC-2012
pastries chocolate 20 08-AUG-2012
sweets vanilla 10 05-DEC-2012
pastries vanilla 20 05-NOV-2012
I have tried Queries with Max(DATE-ORDERED) and grouping it..its not showing me results because I don't have indexes in my data.
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Aug 14, 2011
is the definition of my table :
CREATE TABLE DATEFETC
(
ID VARCHAR2(10 BYTE),
DT DATE
)
And these are the data that are available,(select * from DATEFETC)
IDDT
00108-09-2011
00208-10-2011
00308-11-2011
That's fine.
Now i am executing this query ,but this is returning no rows.Why ?
select * from datefetc where dt between to_date('08-08-2011','mm-dd-yyyy') and to_date('08-12-2011','mm-dd-yyyy')
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Mar 13, 2013
I am trying to get the last 7 days of record from today date, this query runs every night and I always want the last 7 days. Example - today is 3/13/2013 so I want record from 3/7/2013 to 3/13/2013 and tomorrow it would be 3/8/2013 to 3/14/2013
Here is my query, dont mind the ****,$$$ or ####
SELECT INFORMENT.PRODUCT_OFFER_PURCHASE.*******_#######, INFORMENT.INVOLVED_PARTY.INVOLVED_PARTY_ID, To_Char(INFORMENT.PRODUCT_OFFER_PURCHASE.DATE_ADDED, 'YYYYMMDD'), INFORMENT.DEPOSIT_$$$$$$$.BAL_LEDGER_CURRENT, INFORMENT.PRODUCT_OFFER_PURCHASE.INTEREST_RATE, To_Char(INFORMENT.PRODUCT_OFFER_PURCHASE.DATE_OPEN, 'YYYYMMDD'), To_Char(INFORMENT.PRODUCT_OFFER_PURCHASE.DATE_CLOSE, 'YYYYMMDD'), INFORMENT.PRODUCT_OFFER_PURCHASE.*******_STATUS_CODE, [code]..........
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Nov 30, 2010
I have a table which has the attached data.
Sample data is here
LOGON_DATE NUMBER_OF_LOGINS
11/28/2010 02:00:001
11/28/2010 03:00:001
11/28/2010 04:00:002
11/28/2010 06:00:004
11/28/2010 07:00:002
11/28/2010 08:00:003
11/28/2010 09:00:006
[Code] ........
I am trying to do a report like this.
Date PeakUsersBetween6AMand6PM AVGUsersBetween6AMand6PM PeakUsersBetween6PMand6AM AVGUsersBetween6PMand6AM
Output should be
11/28/2010 25 11 49 27
11/29/2010...
I am using analytical function to do this, It throws an error range cannot be used for dates.
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