Last Date / Time When Index Used For Select
Jul 26, 2011
Is there a way I can find what the last date/time and index was used for a select...
I have a table with several indexes on them, which I beleive are not being accessed.
I use the following the query to find indexes that where not accessed in a while but this I believe is limited my my workload repository retention, which is set to 90 days.
select index_name from dba_indexes where table_name='<table name>'
and index_name not in (select c1 from(
select p.object_name c1, p.operation c2, p.options c3, count(1) c4
from dba_hist_sql_plan p, dba_hist_sqlstat s
where p.object_owner = 'MTAS' and p.operation like '%INDEX%' and p.sql_id = s.sql_id
group by p.object_name, p.operation, p.options
order by 1,2,3))
Without increasing my repository retention is there a way I can get the last date/time, which an index was used instead of just saying it has not been used in 90 days (retention setting). Is this information kept in the SQL plan?
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Jun 4, 2012
When I try to extract the date tag value from XML data, the time stored in 20120602153021 format i.e., YYYYMMDD24HHMISS format. The following statement extracts only date as 02-JUN-12 however do not extract the time part.
If I try the same in SQLplus with to_date it works however fails in PL/SQL.
XML data:
<?xml version="1.0"?>
<RECORD>
<REGTIMESTAMP>20120601130010</REGTIMESTAMP>
</RECORD>
PL/SQL Extract:
CURSOR c_xml_record
IS
SELECT extract(value(d), '//ACTIVATIONTS/text()').getStringVal() AS REGTIMESTAMP,
FROM t_xml_data x,
[code].......
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Jun 6, 2012
I am not able to load complete date along with time in the date column. here is my table desc
DESC STAGE
Name Null Type
----------------------------------
TABLE_NAME NOT NULL VARHCAR(20)
RECORDCOUNT NUMBER
CREATED_DATE NOT NULL DATE
my control file is like this
LOAD DATA
APPEND
INTO TABLE SCOOP.STAGE
FIELDS TERMINATED BY ","
( TABLE_NAME
,RECORDCOUNT
,CREATED_DATE DATE(16) "YYYYMMDDHH:Mi:SS"
)
the data gets loaded, but it appears like this in the table
HIGHSCHOOL3080606-JUN-12
MIDDLESCHOOL8768006-JUN-12
BUT I WANT COMPLETE DATE AND TIME (HH:MI:SS) , HOW CAN I GET IT (THIS IS HOW I WANT 06-JUN-12 11:07:33)
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Dec 23, 2012
I want to reset my date to this format: 12/31/2012 11:59:59 PM - see code below:
DECLARE
v_latest_close DATE;
BEGIN
v_latest_close := TO_DATE ('12/31/2012 23:59:59 ','MM/DD/YYYY HH24:MI:SS');
DBMS_OUTPUT.PUT_LINE('The new date format is : '|| v_latest_close);
END;
the code above displays only : 12/31/2012 instead of 12/31/2012 11:59:59 PM
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Sep 16, 2011
I need to convert the type of GMT to Local time, during data entry. I have a source table and a target table.
To make the insert get the most value, I have no problems:
insert into destination (SELECT * FROM WHERE source pointnumber = (SELECT MAX (pointnumber) FROM source));
But since times are different between the tables, I want to convert the data obtained to GMT -4:30 Time (Caracas - Venezuela), before inserting it.
I can use a function?
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May 21, 2013
I am having problems with the XMLTable function. I cant get it to see the entire date/time value in a date field. This wont work
select x1.* from XMLTABLE('/DOCUMENT' passing xmltype('<DOCUMENT><STR>abc def ghi</STR><NUM>1234</NUM><DT>2013-02-17T04:24:02</DT></DOCUMENT>') columns STR varchar2(25), NUM number, DT date) x1;
However if I change the DT tag to just the date only "2013-02-17" it works. Why wont Oracle see the entire date/time format even if its ISO 8601 compliant?
Oracle DB: 11.2.0.3.0
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Apr 7, 2011
I'm using Oracle 11g and I have a bunch of indexes and I want to check if they are being used. I just ran my workloads and now I want to see when each one was last used so I can see if it was during my timeframe or not.
After I ran my test, I found the below, but since I did not enable this, plus I have many indexes.
--Monitor an index to see if it's used
alter index SAMPLE_INDEX monitoring usage;
select * from v$object_usage where index_name = 'SAMPLE_INDEX';
alter index SAMPLE_INDEX nomonitoring usage;
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Aug 2, 2012
Is the index suggested on the date column.
Here is the nature of the date column in my case:
1. The table populates with 1000's of records every day with date being always incremental (current date).
2. The search criteria from the weba application (ADF) is based on the date, user gives the range.
3. From ADF I am referring to it as sql.Timestamp when building the query.
Does Index suggested on the date column here and if so what type of index ?
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Jul 11, 2013
The problem was describe:
- First time to execute: Using all indexes on 2 tables
- Second time to execute: Using only indexes on first table, full table scan on the other
- Third time to execute: Do FTS on both of tables.
Now, I show the objects and relate information here:
The Tables:
system@dbwap> select count(*) from my_wap.news_relation;
COUNT(*)
----------
272708
system@dbwap> select count(*) from my_wap.news_content;
COUNT(*)
----------
95092
system@dbwap> desc my_wap.news_content;
Name Null? Type
----------------------------------------------------- -------- ----------------
ID NOT NULL NUMBER(11)
SUBJECT NOT NULL VARCHAR2(500)
TITLE VARCHAR2(4000)
STATE NUMBER(1)
IMGPATH VARCHAR2(500)
ALIGN VARCHAR2(10)
[Code]....
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Aug 17, 2010
Is there any way to reduce the index creation time. I have one table which has 7700000 records and every day this table get truncate and we create with create table as select statement and then create the 4 indexes and each index took 5 minutes so in totality it took 20 minutes in index creation.
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Sep 13, 2012
I've a query like
update tab1
set col1 = ( select col2 from
tab2
where tab1.id = tab2.id) table 1 has arnd 10,000 rows
table 2 has arnd 1,700,000 rows and has a primary key on column id.This query is taking around 20 secs to execute. I checked the x-plan and most of time taken for table access by index rowid.I checked the stats for the tab2, its just three days old.
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Nov 10, 2010
Is it a possible to create table using clause below together with index ?
create table the_table
as
select col1, col2 from table2
I got procedure which create a table in the schema B. The procedure is called from schema A. But when I write into procedure query for create index
then I got a error:
ORA-01031: insufficient privileges when
...executing
Therefore I think about to create table together with index.
begin
B.proc.cre_table;
end;
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Dec 11, 2012
explain slow performance of multicolumn indexes on oracle 11g R2 observed in the following scenario? A multi-column index (b-tree index) not partitioned, not unique, not reversed with 3 columns.
A series of queries are run using all 3 columns. The performance hit comes when the first order column values changes. So, maybe after 10 select queries the value changes. The 2nd and 3rd order columns are changing throughout the series of select calls, but no performance bottleneck it hit then.
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Mar 21, 2013
I have partitioned an oracle table and created Local Index for the Partitioned table .
Now i want to make sure that the Local index is being used when i perform select query on the Table partition.
How do i confirm that ? can i check the explain plan generted for the select query to confirm local index is being used ?
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Feb 25, 2010
DT1 is a column of date datatype and there is no index created on the table
I want to add the below lines in the sql
TO_CHAR(DT1,'YYYY') BETWEEN '2005' AND '2009'
Which one should I use in where condition to query and why?
1. TO_CHAR(DT1,'YYYY') BETWEEN '2005' AND '2009'
2. DT1 BETWEEN '01/01/2005' AND '31/12/2009' (as NLS date format will not change)
3. DT1 BETWEEN to_date('01/01/2005','dd/mm/yyyy') AND ('31/12/2009' ,'dd/mm/yyyy')
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Jan 10, 2012
we have a strange symptom in a database Oracle 11.2.0.2 EE. Following question comes from our application developers.
The following SQL statement:
SELECT
v.reporting_month,
sum(v.f_s) "REV_S",
sum(v.f_f) "REV_F",
sum(v.f_c) "REV_C",
[code].......
gives different result when we exchange the index ksr_valid_until_i on table kreditkarten_sets_rs. For some reasons we changed the index from bitmap to normal and are getting different results. Switching back gives us the same results as before. When we avoid the usage of this index in the statement than we are getting the same results as when we are using the normal index.
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Jul 5, 2010
I have a table with an index on the file_id column, defined in the same way in a test site and a production site.The only difference of these two tables is the amoun of data contained on it.the test site table contains about a million of records.the production table contains about 17 millions of records.
When I do a select on the table in test site, it returns the information in a sorted way.however, when I do the same select on the production site, the information is received in an unsorted way.
I assume that the index in production site might need to be rebuilt, because usually a big amount of data is extracted and deleted from the table and new information is inserted constantly.this situation does not occur in test site, information change is not very usual.
if rebuilt of index would actually to get the results on a sorted way, or the only way to get it is to add an "order by" statement in the query statement.
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Jul 20, 2012
I have to display a 24 hours time as an index. (00:00 - 23:00) That is easy, if the data exists.
But, if the data is not regularly exists on specific hour (the time/hours is not regular, i.e: 00:00, 01:00, 05:00, 08:00, 10:00, 11:00, 23:00), then it is OK for a TABLE, but not for a CHART.
Here is the story:
I wrote an SQL statement that can "choose" what to display respectively to the the available time. The result will be displayed on the chart: Days or Time is used for X-Axis, and the respective Value on the Y-Axis.
Example:
+ if the data consists of "days" (i.e: the last 5 days from now, 16/07/2012, 17/07/2012, 18/07/2012, 19/07/2012, 20/07/2012), then the chart will show those dates on the X-Axis.
+ if the data consists of "hours" (i.e: 1 single day, from 00:00 hour - 23:00), then the chart shows hours on the X-Axis.
If the 'hours' are not regular, means: there is no data on specific hours, the query result is also not regular, means: the X-Axis-value 'jumps' irregularly.
Question:
Is it possible to query our own static value?
for example:
select 'hello' from dual --> result: "hello", 1 column, 1 row
But how to display this in multiple rows, i.e.:
Time
*****
0
1
2
3
4
5
...
...
23
Note: the X-Axis on the chart template can be only customized for 1 single mode, example: "Days", but of course it is not going to show up properly if the query result are in "Hours". It means: I have to find the workaround on the SQL Query.
DB: ORA 11
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Feb 21, 2011
I have one table with 10 rows and its frequently updated now my question is that, how can it get the latest date of updation of that rows?
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Jun 30, 2012
I have created domain indexes on text columns of a materialised view to use "contains" clause when searching for data. The select query with "contains" clause does not return any records, however I was able to retrive data using via regular query using a like search.
-> will exec ctx_ddl.sync_index('index_name')'resolve my problem?
-> since the view is a materialized view, how can i make sure that the latest data added are also picked up?
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Sep 8, 2009
SQL> select * from v$version;
BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE 10.2.0.4.0 Production
TNS for Solaris: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
5 rows selected.
I have a problem with views and nested selects which I cannot explain. Here is a trimed down version of the research I have done. notice the following:
1) all code is executed from the same user CDRNORMALCODE. this user has all views and procedural code
2) all data is owned by a different user CDRDATA. This user has no views and no code.
My problem is this:
If I reference the table directly with a delete statement that uses a nested select (i.e. IN clause with select), the index I expect and want is used.But if I execute the same delete but reference even the most simple of views (select * from <table>) instead of the table itself, then a full table scan is done of the table.
Here is an execute against the table directly (owned by cdrdata). Notice the reference to the table in the table schema on line 3. Also please notice INDEX RANGE SCAN BSNSS_CLSS_CASE_RULE_FK1 at the bottom of the plan.
SQL> show user
USER is "CDRNORMALCODE"
SQL>
SQL> explain plan for
2 delete
[code]...
OK, here is an update. The views I am useing normally have instead of triggers on them. If I remove the instead of trigger the problem looks like it goes away, when I put the trigger back the problem comes back.But why would an instead-of-trigger change the query plan for a view?
SQL> DELETE FROM PLAN_TABLE;
5 rows deleted.
SQL> explain plan for
2 delete
3 from BSNSS_CLSS_MNR_CASE_RULE_SV
[code]...
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May 24, 2010
The following query gives error.
select count(*)
from invoice
where inv_id in (SELECT inv_id FROM invoice_hist WHERE to_char(timestamp) between TO_char('05/12/2010 18:22:00', 'MM/DD/YYYY HH24:MM:SS') and
TO_char('05/21/2010 18:22:00', 'MM/DD/YYYY HH24:MM:SS'));.
Here timestamp is of type DATE in the invlice_hist table.
What change is needed?
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Sep 17, 2013
I have this sample:
the column data1 is datetime datatype with
t as ( select 'SMITH' nom,to_date('21/09/2013 07:30:00') data1
from dual union all select 'ALLEN',to_date('21/09/2013 07:40:00')
from dual union all -- select 'WARD',to_date('21/09/2013 07:50:00')
from dual union all
select 'JONES',to_date('21/09/2013 08:00:00')
from dual union all
[Code]..
How can I write a select to check that If I input 10 minutes to nom 'ALLEN' it's ok because the time 07:40 + 10 minutes = 07:50 the row not exists, (the next)but If input 20 it exists because the sum = 08:00 and row isn't free , indeed, there is 'JONES'?
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Sep 20, 2013
I have to concatenate a date(not sysdate) with the system time and store it in a column having datatype as DATE... So I tried like this....
SELECT TO_CHAR (C_DATE, 'DD-MON-YYYY') || ' ' || TO_CHAR (SYSDATE, 'HH:MI:SS PM') FROM DUAL;
But while inserting the output of the above query in my table it throws error like this... ORA-01830: date format picture ends before converting entire input string Is there any possibility to achieve this.
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May 18, 2012
I am working with following select clause:
select distinct S.ID ID
from
ods.hso_Scheduled H,
ods.SO_SCHEDULED S
where
S.insertion_date >= to_date('01-DEC-2011') and S.insertion_date < to_date('01-FEB-2012')
and H.ID=S.ID
Both the involved tables, HSO_SCHEDULED is having 15 million records and SO_SCHEDULED table is having 7 million records.
I have created following indexes on these tables:
Indexes on SO_SCHEDULED:
Index name Column name
SS_IDX1ID, SO_SUB_ITEM__ID
SS_IDX2INSERTION_DATE
SS_IDX3ID, INSERTION_DATE
SS_IDX4ID, SO_SUB_ITEM__ID, INSERTION_DATE
SO_SCHEDULED_ID_PKID
Indexes on HSO_SCHEDULED:
HSS_IDX1ID, SO_SUB_ITEM__ID, LAST_UPDATING_DATE
HSS_IDX2ID, LAST_UPDATING_DATE
HSS_IDX3ID
My problem is despite of having relevant indexes present, my query is not hitting them and hence the performance is very bad.
Explain Plan:
Execution Plan
----------------------------------------------------------
Plan hash value: 574170360
--------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time | TQ |IN-OUT| PQ Distrib |
--------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 814K| 38M| | 9574 (1)| 00:02:15 | | | |
| 1 | PX COORDINATOR | | | | | | | | | |
| 2 | PX SEND QC (RANDOM) | :TQ10002 | 814K| 38M| | 9574 (1)| 00:02:15 | Q1,02 | P->S | QC (RAND) |
| 3 | HASH UNIQUE | | 814K| 38M| 185M| 9574 (1)| 00:02:15 | Q1,02 | PCWP | |
|* 4 | HASH JOIN | | 2653K| 124M| | 9564 (1)| 00:02:14 | Q1,02 | PCWP | |
| 5 | PX JOIN FILTER CREATE| :BF0000 | 814K| 22M| | 3903 (1)| 00:00:55 | Q1,02 | PCWP | |
| 6 | PX RECEIVE | | 814K| 22M| | 3903 (1)| 00:00:55 | Q1,02 | PCWP | |
| 7 | PX SEND HASH | :TQ10000 | 814K| 22M| | 3903 (1)| 00:00:55 | Q1,00 | P->P | HASH |
| 8 | PX BLOCK ITERATOR | | 814K| 22M| | 3903 (1)| 00:00:55 | Q1,00 | PCWC | |
|* 9 | TABLE ACCESS FULL| SO_SCHEDULED | 814K| 22M| | 3903 (1)| 00:00:55 | Q1,00 | PCWP | |
| 10 | PX RECEIVE | | 14M| 272M| | 5654 (1)| 00:01:20 | Q1,02 | PCWP | |
| 11 | PX SEND HASH | :TQ10001 | 14M| 272M| | 5654 (1)| 00:01:20 | Q1,01 | P->P | HASH |
| 12 | PX JOIN FILTER USE | :BF0000 | 14M| 272M| | 5654 (1)| 00:01:20 | Q1,01 | PCWP | |
| 13 | PX BLOCK ITERATOR | | 14M| 272M| | 5654 (1)| 00:01:20 | Q1,01 | PCWC | |
| 14 | TABLE ACCESS FULL| HSO_SCHEDULED | 14M| 272M| | 5654 (1)| 00:01:20 | Q1,01 | PCWP | |
--------------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
4 - access("H"."ID"="S"."ID")
9 - filter("S"."INSERTION_DATE">=TO_DATE(' 2011-12-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND
"S"."INSERTION_DATE"<TO_DATE(' 2012-02-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))
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Apr 24, 2005
I only know to retrieve data (date & time) by the following statement : "select sysdate from ..."
but now I want to make the fields current date and current time separately and put in a adult file with these two fields. how to do it.
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Sep 28, 2011
I had a database at microsoft access but i had move it to the oracle database.
When i check the datatype at oracle, date column is at DATE datatype. but it only display date. like in oracle. it display:
oracle_date.PNG ( 74.61K )
Number of downloads: 4
But when i link it to microsft access. like i will control the oracle from access. the result is at below:
access_date.PNG ( 136.11K )
Number of downloads: 3
So, my problem is how to display the date and time fully in oracle?
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Mar 1, 2010
iam having a table A where column ABC is a varchar field with varchar2(50).
currently data stored is like this.
02-27-2009 11:01:33
02-27-2009 11:01:46
03-06-2009 09:07:18
now i want UTC Date time should be in format 2010-02-24T17:08:09Z. in the above format.
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Apr 3, 2012
is there possible to retrieve date with its time in oracle ,if we didnot provide time while insertion? like hiredate column of emp table can we get hiredate of each emp with its time of joining. i am using "11g Enterprise Edition Release 11.2.0.1.0"
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Nov 1, 2012
I have a question with Oracle sql developer, i've installed oracle 11g express edition, and i want to insert values 'date' and 'time', but i only got the resultat like this:
Who can tell me how can i do to show just date info in 'date' and same for the 'time'?
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