PL/SQL :: Index On Date Column
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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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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Jun 1, 2010
I'm trying to work out how to take a table like this:
IDDate
12502-Feb-07
12516-Mar-07
12523-May-07
12524-May-07
12525-May-07
33302-Jan-09
33303-Jan-09
33304-Jan-09
33317-Mar-09
And display the data like this:
IDPeriodPeriod StartPeriod End
125102-Feb-0702-Feb-07
125216-Mar-0716-Mar-07
125323-May-0725-May-07
333102-Jan-0904-Jan-09
333217-Mar-0917-Mar-09
As you can see, it's split the entries into date ranges. If there is a 'lone' date, the 'period start' and the 'period end' are the same date.
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Jul 23, 2013
is there some performance/access difference between a bitmap index on a number column and char(1) column? Both columns are not null with a default value.My application has a querie like this:
select ass.column20, ass.column30from table_a pucinner join table_b asson ass.column1 = puc.column1where pc.column_char = 'S'and ass.column_char02 = 'P'
If I create a bitmap index on column "column_char", the access plan is not changed. But changing the column datatype to number(1) and obviously the values, the index is accessed and the cost decreases.This table has 4.000.000 rows. Oracle 11.2.0.2SO
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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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Jun 21, 2012
How can we partition a table based on date if it does not have a date column.
Actually I have to compare two tables on daily basis and fetch few rows from those two tables and enter it to a third table.But both these tables does not have a date column.
I am confused if i need to alter those tables and add date column or if there is some way in which i can compare the data from the two tables for that particular day only and not the whole table data.
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Aug 16, 2010
i have a table with the following description
create table gl_periods(period_name varchar2(10),transactions number (2) );
with the data as :
period_name transactions
------------ --------------
JAN-10 12
FEB-10 12
MAR-10 8
APR-10 23
ADJ_TOM-10 25
MAY-10 37
JUN-10 41
JUL-10 10
PHY_JAY-10 6
AUG-10 14
SEP-10 22
My requirment is to find out the period names and transactions which are in valid date formats and are less than sysdate and the non date formats are adjustments made by different users for their transactions
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Oct 18, 2012
I want to load data from a file using sqlldr.I have a table commissions
(
technician_id char(5)
, tech_name char(30)
, Comm_rcd_date DATE
, Comm_Paid_date DATE
, comm_amt number(10,2)
)
my file is
00001,TIMOTHY TROENDLY,2011-03-04T01:45:12+0006,2011-03-04T01:45:12+0007,123.56
00002,KENNETH KLEMENZ,2011-03-04T01:45:12+0006,2011-03-04T01:45:12+0009,123.56
00003,SHUNDAR ARDERY,2011-03-04T01:45:12+0006,2011-03-04T01:45:12+0005,123.56
write a ctl file to load this data.
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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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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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Dec 25, 2012
I have a partitioned table with ~50 million rows that was setup with a number(10) instead of a date column. All the data in the table is ALWATS in this format YYYYMMDD
CREATE TABLE T1.monthly
(
SEQ_NUM NUMBER(10) NOT NULL,
DAY_DK NUMBER(10) NOT NULL
)
TABLESPACE USERS
PCTUSED 0
PCTFREE 10
[code]........
some sample data
SEQ_NUM DAY_DK
---------- ----------
990 20121225
991 20121225
992 20121225
993 20121225
994 20121225
995 20121225
996 20121225
997 20121225
998 20121225
999 20121225
When I use the exchange partition method the parition is able to move the data from "monthly" table to "mth" table.
desc t1.mth; ### my temorary table
Name Null? Type
----------------------------------------- -------- ----------------------------
SEQ_NUM NUMBER(10)
DAY_DK NUMBER(10)
Than when I try to alter my temp table "mth". I get an error table must be empty to change column types.
alter table n546830.mth modify (DAY_DK date);
Next I tried making my temporary table "mth" a date column. When I an the exchange partition command I get the following error:
alter table t1.monthly exchange partition DEC_2012
with table t1.mth without validation;
alter table n546830.monthly exchange partition DEC_2012 with table n546830.mth without validation
*
ERROR at line 1:
ORA-14097: column type or size mismatch in ALTER TABLE EXCHANGE PARTITION
Method I can use to convert a number(10) to date column and keep the information in a table. Note, I don't care about HH:MM:SS as I never had that information to begin with and would be happy to set that part of the date column to all zeroes "00:00:00"
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Oct 31, 2012
I have a table with column A which contains very few null values. I need to select these rows. I am considering two options:
a) create function based index on NVL(A, 0) and use this in where clause NVL(A, 0)=0 (column doesn't have values 0)
b) create function based index on NVL2(A, 0, NULL) and and use this in where clause NVL2(A, 0, NULL) = 0
First idea was option A. But I realized in option B the index will be much smaller, because most of values of column A isn't NULL so NVL2 will return NULL and index will not have as much leafs as in NVL. It is good idea to use NVL2? Is there any against to use option B instead of A?
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Jan 17, 2011
I have created one unique index on one column of my table. Now i would like to add one more column in the same index without dropping the index.
SQL > CREATE TABLE DEBUG_TABLE
2 (
3 SLNO NUMBER,
4 MESSAGE VARCHAR2(4000 BYTE),
5 CREATED_DATE DATE DEFAULT SYSDATE,
6 CREATED_TIME TIMESTAMP(6) DEFAULT SYSDATE
7 );
Table created.
SQL > CREATE UNIQUE INDEX index_debug1 ON debug_table (SLNO);
Index created.
SQL > ALTER INDEX index_debug1 ADD COLUMN MESSAGE;
ALTER INDEX index_debug1 ADD COLUMN MESSAGE
*
ERROR at line 1:
ORA-02243: invalid ALTER INDEX or ALTER MATERIALIZED VIEW option
SQL >
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Oct 5, 2013
If my query is under execution and I want to make an index on a column which is very much needed by my query. Will a simple index solve the purpose or is there any extra keyword required ?
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Sep 23, 2010
I currently have a 5 column index on a table with over 2 billion records (paritioned on created_date (weekly) that is not very effective.I am contemplating replacing this 5 key index and creating a new single column index made up by hashing of all the 5 five columns.
Is this a wise stratgey? How can I implement this so it is most effective and I dont shoot myself in the foot?
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Oct 13, 2011
I have a table with, for example, three columns: A, B,C.
I execute on this table only one select: CODESELECT * FROM TABLE WHERE A = :1 AND B=:2
Column A has a lot of distinct values (numbers), but B can have only two values: 'Y' or 'N' (cardinality about 50%/50%). It is worth to create index on two columns: A, B? Does query using index on A column will be much slower than using index on A, B?
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Jan 24, 2012
I have in my database (OLTP-System) a table with about 6000000 records and a zise of about 2GB.
the way to create multi_column indexes on the table?
What are the rule to define the best-position of a column in an index?
index_1(col_1,Col_2,col_3) and not [ (col_1,Col_3,col_2) or (col_2,Col_3,col_1) or (col_2,Col_1,col_3) or (col_3,Col_2,col_1) or (col_3,Col_1,col_2) ] ?
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Apr 15, 2010
I am creating an index in program and then drop the index at the end of the program. Some times due to some problem if the index could not be dropped and the user again runs the program then we get the error
ORA-01408 Index already exist on the column.
how I can get away with this error or how I can check whether the index with the same columns exits prior to creating an index.
Is there any command like
Create or replace index.....
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May 17, 2011
what my issue is with this virtual column
CREATE TABLE C0HARPA.VCOL_TAB
(
col1 VARCHAR2(30 BYTE),
v_col1 VARCHAR2(6) GENERATED ALWAYS AS (SUBSTR(col1,1,6)) VIRTUAL
)
TABLESPACE TOOLS
[code]...
Lastly, can an index be created on a virtual column? I am thinking no since it calculated?
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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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Apr 2, 2011
here is my query
SELECT CURRENTSTEP
FROM (SELECT ( WFENTRY.NAME
|| ','
|| CURRENTSTEP.STEP_ID
) AS CURRENTSTEP,
(CASE
WHEN WFENTRY.NAME IN
[Code]...
in this query I am concatenating tow columns , I use this query as a sub query in my other queries and filter the results with and CURRENTSTEP = ?
here is how I use it
select
sys_audit_id
from
( SELECT
*
FROM
(SELECT
F.FINDING_NUMBER,
[Code]....
I saw adding this as a subquery with the filter and CURRENTSTEP = ? is slowing my query very much , as this is a derived column i cannot add index then how to improve performance for this subquery ?
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Oct 23, 2012
I have a table A with a column B timestamp(6). The tables contains around 300000 rows..I have created index 'idx' on the column B.When i compare column 'B' with systimestamp, it does not use the index, whereas if i compare 'B' with sysdate it uses the index.
Eg :
select count(*) from a where b<=sysdate;
The above used the index 'idx' and executed in 1 second
select count(*) from a where b<=systimestamp;
The above does not use the index and executed in 19 seconds.
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Feb 20, 2013
Version Info: 11.2 on Solaris 10
I have a partitioned table like below. I want to create a B-Tree index on SALES_RGN column which is neither the part of Primary key or the Partitioned key. Should I create this index as local or Global ?
CREATE TABLE sales_dtl
(
txn_id number (9),
salesman_id number(5),
salesman_name varchar2(30),
sales_rgn varchar2(10), -----------------------------> This column needs to be indexed
sales_amount number(10),
sales_date date,
constraint pk_sales_dtl primary key (txn_id)
[code]....
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Oct 10, 2013
We have a table called address and having the address fields and city ,state etc. The table will store huge amount of data .We need to query on the table. I would like to know how can we fasten the query and improve the performance of the query by creating index on these columns...Query is given below . note that the nullable columns can have data
SELECT *
FROM address
WHERE address1 = 'a'
[Code]....
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Feb 2, 2012
I'm altering a column length to increase the size and getting "ORA-30556: functional index is defined on the column to be modified".
On searching more about this error, it seems like the function index must be dropped before altering the column.The table I'm dealing with is huge.
Question 1:In case of dropping and recreating the index, should the following steps be done:
- Drop Index
- Alter the column to increase the size
- Recreate the index with NOLOGGING and NOPARALLEL clause
- ALTER INDEX to turn on LOGGING
- Gather Statistics on that index
Question 2:Is there anything else that should be done when the index is dropped and re-created?
Question 3:What are the side-effects of carrying out the above steps in a huge table with around 15 million rows?
Question 4:Would it work if I disable the index, alter the column and reenable the index?Do I have to rebuild the index and gather Stats upon reenabling it?
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Feb 25, 2012
I need to create a composite unique index on varchar2, number and CLOB column. I haven't used such index before that have the CLOB column indexing. I found the below link related to CLOB indexing...
[URL]......
Links from where I can get related info. Also I would like to know the impact of such index on performance. I have to store and process around 50 million records in such a way, will it be beneficial to use this index?
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Jan 10, 2013
I have an index on column of table which of data type varchar2. While selecting data from that table I am using following scenarios in where on the indexed column
like '%abc%'
like 'abc%'
like '&abc'
Will be the corresponding index will be for those cases?
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Mar 13, 2012
I'm working on a Java Web Application
(User input(jsp)<-->Controller<----->DAO<----->Database) project where the user submits certain fields (partyId, DocId, cbrxPath, cbrValue, nodeId, TRANSLATION_Class and so on)and they are saved in 3 different tables (Party_Document_Node table, Routing and Routing_Node table).
Here's the portion of the DAO code below where the problem is:
public class AssociationsDAOOracleImpl implements AssociationsDAO {
private static final String PARTIES_WITH_ASSOCIATIONS = " Select distinct(party_id) from PARTY_DOCUMENT ORDER BY 1";
private static final String ASSOCIATION_FETCH_QUERY = " Select PARTY_ID, DOCUMENT_ID, NODE_ID, APPLICATION_CONTEXT_XPATH, DOCUMENT_LOGGING FROM PARTY_DOCUMENT_NODE WHERE PARTY_ID = ? ORDER BY PARTY_ID ";
private static final String ROUTING_FETCH_QUERY = " Select CONTENT_ROUTING_PATH FROM ROUTING WHERE PARTY_ID = ? AND DOCUMENT_ID =? ORDER BY PARTY_ID ";
private static final String ROUTINGNODE_FETCH_QUERY = " Select CONTENT_ROUTING_VALUE, TRANSLATION_CLASS FROM ROUTING_NODE WHERE PARTY_ID = ? AND DOCUMENT_ID =? AND NODE_ID =? ORDER BY PARTY_ID ";
private static final String CONTEXT_FETCH_QUERY = " Select CONTEXT_VALUE, CONTEXT_INSTANCE, CONTEXT_KEY FROM APPLICATION_CONTEXT where party_id = ? and document_id = ? and node_id = ? ";
private static final String NODEID_FETCH_QUERY = " Select NODE_ID FROM PARTY_DOCUMENT_NODE WHERE PARTY_ID = ? AND DOCUMENT_ID =? AND NODE_ID =? ORDER BY PARTY_ID ";
[code]....
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Jan 28, 2011
I came across situation where a Nullable column is not using index for 'order by' clause. I added Not Null condition in the 'where' condition but it wasn't useful. I don't wanted to make composite index with not nullable column or with constant or modify column to 'Not Null'
So I carried out test cases and during which I found that in one case the sql statement does 'fast full scan' for data access but does not use index for 'order by' sorting
here are the steps
Initially I kept the column Nullable
SQL> create sequence s5;
Sequence created.
SQL> create table t5 as select s5.nextval id,a.* from dba_objects a where rownum<1001;
Table created.
SQL> set pages 100
SQL> select column_name,nullable from user_tab_columns where table_name='T5';
SQL> create index i5 on t5(id);
Index created.
SQL> exec dbms_stats.gather_table_stats(user,'T5',cascade=>true);
PL/SQL procedure successfully completed.
exit
SQL> alter session set events '10046 trace name context forever, level 12';
select *
from
t5 where id is not null order by id
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 68 0.00 0.00 0 16 0 1000
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 70 0.01 0.00 0 16 0 1000
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 5
Rows Row Source Operation
------- ---------------------------------------------------
1000 SORT ORDER BY (cr=16 pr=0 pw=0 time=4771 us)
1000 TABLE ACCESS FULL T5 (cr=16 pr=0 pw=0 time=1157 us)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 68 0.00 0.00
SQL*Net message from client 68 49.49 49.72
********************************************************************************
select /*+ index(t i5) */ *
from
t5 t where id is not null order by id
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 68 0.00 0.00 0 150 0 1000
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 70 0.00 0.00 0 150 0 1000
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 5
Rows Row Source Operation
------- ---------------------------------------------------
1000 TABLE ACCESS BY INDEX ROWID T5 (cr=150 pr=0 pw=0 time=5167 us)
1000 INDEX FULL SCAN I5 (cr=71 pr=0 pw=0 time=3141 us)(object id 4673065)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 69 0.00 0.00
SQL*Net message from client 69 22.89 28.04
Now I modified the 'id' column to Not Null
SQL> alter table t5 modify id not null;
SQL> set pages 100
SQL> select column_name,nullable from user_tab_columns where table_name='T5';
COLUMN_NAME N
------------------------------ -
ID N
OWNER Y
OBJECT_NAME Y
SUBOBJECT_NAME Y
OBJECT_ID Y
DATA_OBJECT_ID Y
OBJECT_TYPE Y
CREATED Y
LAST_DDL_TIME Y
TIMESTAMP Y
STATUS Y
TEMPORARY Y
GENERATED Y
SECONDARY Y
14 rows selected.
select *
from
t5 order by id
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.00 0.01 0 29 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 68 0.00 0.00 0 16 0 1000
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 70 0.01 0.01 0 45 0 1000
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 5
Rows Row Source Operation
------- ---------------------------------------------------
1000 SORT ORDER BY (cr=16 pr=0 pw=0 time=2398 us)
1000 TABLE ACCESS FULL T5 (cr=16 pr=0 pw=0 time=1152 us)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 68 0.00 0.00
SQL*Net message from client 68 37.74 37.91
********************************************************************************
select /*+ index(t i5) */ *
from
t5 t order by id
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 68 0.00 0.00 0 150 0 1000
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 70 0.00 0.00 0 150 0 1000
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 5
Rows Row Source Operation
------- ---------------------------------------------------
1000 TABLE ACCESS BY INDEX ROWID T5 (cr=150 pr=0 pw=0 time=4166 us)
1000 INDEX FULL SCAN I5 (cr=71 pr=0 pw=0 time=3142 us)(object id 4673065)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 68 0.00 0.00
SQL*Net message from client 68 8.28 8.45
select id
from
t5 order by id
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 68 0.00 0.00 0 6 0 1000
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 70 0.00 0.00 0 6 0 1000
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 5
Rows Row Source Operation
------- ---------------------------------------------------
1000 SORT ORDER BY (cr=6 pr=0 pw=0 time=1342 us)
1000 INDEX FAST FULL SCAN I5 (cr=6 pr=0 pw=0 time=1093 us)(object id 4673065)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 68 0.00 0.00
SQL*Net message from client 68 1.88 1.89
Questions are
1) Why adding 'where id is not null wasn't enough for the index to get used in 'order by'?
2) While we got 'fast full scan' why index wasn't used for 'order by' clause?
3) Do we need the indexed column in where clause for being used in 'order by clause' too?
4) Do we need 'order by' clause if we are selecting only the indexed column with sequence generated values?
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May 20, 2013
I am trying group by count on Monthly basis, entered_timestamp Column is of DATE datatype.
select count(*),to_char(entered_timestamp,'MM-YYYY') MONTHLY from payments
where type = 'BOOK' group by to_char(entered_timestamp,'MM-YYYY') order by MONTHLY DESC
Above SQL doesn't gives the output in proper order ,
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