Let's consider such table that all rows fit into single block:
SQL> create table test as select rownum id, '$'||rownum name from dual connect by level <= 530;
Table created.
SQL> create index i_test on test(id);
Index created.
SQL>
SQL> begin
[code].....
why does approach with full scan take longer even if table occupies only one data block? PS. 11gR2
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.
I am rebuilding some UNUSABLE local index partitions on Oracle 8.1.7.4.0 (64bit) database . The platform is a HPUX machine.
The DDL of the partition table/indexes:
=========================
CREATE TABLE TESTME
( INST_NO CHAR(3) NOT NULL,
ACCT_NO CHAR(16) NOT NULL,
REC_NO CHAR(9) NOT NULL,
TRAN_TYPE CHAR(2) DEFAULT ' ',
STAT CHAR(2) DEFAULT ' ',
[code]...
when i am Executing the following statement
SELECT DISTINCT EXPOSURE_REF FROM KBNAS.VW_EXPOSUREDETS_FOR_CCYREVAL
WHERE EXPOSURE_CURRENCY='THB' AND BASE_TXN_CCY='USD' AND BRANCH_CODE='7000'
AND (REVAL_STATUS='O') AND CONV_RATE<>'62' AND (EXPOSURE_AMOUNT<>0)
UNION
SELECT DISTINCT ED.EXPOSURE_REF FROM KBNAS.EXPOSURE_DETAILS ED,
[code].....
I have attached DDL for table EXPOSURE_DETAIL(PARTITION),LEDGERCARD,LEDGERCARDDETAILS, DDL for INDEX on those tables and DDL for Views..
Issue: we have created the Indexes but when we check the explain plain .. full table scan is going on..I have attached the explain plan ..
I have created an non unique index lk_fein on lookup_fein( code,map_id,trash). When I check the explain plan it does a full table scan on lookup_fein. if I force it to use index by it does and the cost also decreases.
SQL> SELECT WORK_FEIN,
2 NON_FEIN ,
3 FI_FEIN ,
4 MFEIN ,
5 TOTAL_FEIN ,
[code]...
I have a huge table (about 60 gb) partition over range. The index on this table is global index created on 4 columns together. I have a query which is running very slowly. The explain plan is showing the use of this global index.Explain plan is not showing pstart and pend because the index is global.
View 6 Replies View RelatedHow can i force a sql use index range scan?
View 10 Replies View RelatedI have a query that seems to repeatedly call an index scan on a table for reasons I'm not sure about. Why it would be doing the index scan on totaldwellingarea in the dimensions table (DIMEN_PID_TDWELLAREA) repeatedly? This only seems to happen when I put on the range clause d.totaldwellingarea between scr.lowvalue and scr.highvalue.
I am using Oracle version 9.2.0.3.
select d.propertyid,d.totaldwellingarea, e.size_, scr.size_
from eqid e, dimensions d, brt_eval.size_code_ranges scr
where e.style not in ('1','A','G','L') and e.size_ = '0'
and d.propertyid = e.propertyid and e.style = scr.style and d.totaldwellingarea between scr.lowvalue and scr.highvalue;
CREATE
TABLE "BRT_ADMIN"."EQID"
(
"PROPERTYID" VARCHAR2(20 BYTE) NOT NULL ENABLE,
"EQID" CHAR(10 BYTE),
"ZONE_" CHAR(1 BYTE),
"AREA" CHAR(1 BYTE),
[code].....
i have query lie below.
select
(SELECT MIC.MICR_BANK_NAME FROM M_ECS_MICR_MST MIC WHERE MIC.PK_MICR_ID = BANK.ECS_MICR_CODE) AS BANKNAME,
, (SELECT PAY.PAYMENTCODE FROM M_ECS_PAYMENT_MODE PAY WHERE TO_CHAR(PAY.ID) = BANK.ECS_FACTORING_HOUSE) AS
[code].....
i have used composite index below column which used in the tbl_bank_statement table.like column name tbl_bank_ statement (policy_ no,ecs_ micr_code,ecs_factoring_house,ecs_mandate_status)
but still this table giving me TABLE ACCESS FULL.
In the link below [URL] Thomas kyte has said, use the CBO and select /*+ FIRST_ROWS */ primary_key from table where rownum = 1; it'll read the index and stop at the first row. very fast on a big empty table (as the index is small and empty).
very fast on a big full table as the index is just read to find the first leaf node and then "stop".
It gives faster result if the primary key is used. But what if we have a table with around 1000 million rows and for the predicates there is a index range scan on the table.
What if we have a table say big_table (10000000000 rows) and the sql is something like
select /*+ first_rows */ 1 /* id, attribute_id*/
from big_table
where attribute_name ='Gross Premium'
and value ='10000'
and version_date is null
and rownum=1; --it's taking around 3 min
We observed that in such case there will be a range index scan for the index on the predicates. For a particular id there may be different values for attribute 'Gross Premium' and may have multiple versions.
How I would tune such a query where the purpose is to check if at least 1 records exists in the table for the input?
If you have 3 tables (yr09, yr10,yr11) one with 2009 data, 2010 and 2011 data respectively. And a view (vw_yr091011) with a "union all" on all three.
Question: Will the performance be same for the following two queries ?
Question: Will Oracle read all 3 tables in the view when we search for only one year ?
select count(*) from yr09
where year = 2009;
-- vs
select count(*) from vw_yr091011
where year = 2009;
The following link says yes, the performance remains the same.
Link: [URL]..........
when I tried on a volume of 14000 records. The count came out same but the view took 50 more sec. And the explain plan shows it accessed all three tables.
I have an Index in User1 schema. can i grant access on this Index to User2. if so, what privs i can give..?
for proc's we will give "Grant Execute on proce1 to User2". Like this how on Indexes..
I created table Rang pertitionned, and List subpartitionned. My table is Interval partitionning. My subpartition is template based as is :
PARTITION BY RANGE ( DINFOIDENTITE )
INTERVAL ( (NUMTOYMINTERVAL(1,'MONTH')) )
SUBPARTITION BY LIST ( AVANT_DERNIER_MATCLE )
[Code]....
i would have the same repartition with 10 differents tablespaces, one for each subpartition.
I search on Oracle documentation this morning, but the only thing i've found is that this option is possible with the STORE IN clause, but only for HASH partitionning.
Is there a way to specify STORAGE clause with a template for my indexes ?
How to force an index if the table not using the index?
View 10 Replies View RelatedI�m Using Oracle 11.I have a table with 16 million rows and an index (let's call it the employee table with an index on department). I need to select all the employees whose departments are located in the uk. I achieve this by selecting all the department numbers from departments where location = 'UK' in a sub select then plug this into the main query as follows:
SELECT *
FROM employees
WHERE department IN (SELECT department from departments where location = 'UK');
It takes ages, 25 seconds or more, the explain plan shows its doing a full table scan on emplyees. I need it to use the index. The sub query is instant and returns only 5 rows. If I explicitly put the 5 numbers in the IN clause the query uses the index and executes in 0.04 seconds. See below:
SELECT *
FROM employees
WHERE department IN (1,2,3,4,5);
I need it to use the subquery once and then use the index on the main table.
Below query is degrading the performance of database. As we know that, without where clause, query do full table scan.Now, it is written to generate the sequence no.
SQL> explain plan for
2 SELECT NVL(MAX(P.NUM_SERIAL_NO), 0) + 1 FROM CNFGTR_IRDA_ENVELOPE_DTLS P
3 /
Explained.
SQL> select * from table(dbms_xplan.display());
PLAN_TABLE_OUTPUT
----------------------------------------------------------------------------------------------------
Plan hash value: 3345343365
------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
------------------------------------------------------------------------------------------------
[code].....
Index is not created on the column.
if i have local index, does query which uses this index always have to scan all partitions?
For example, I have hash-partitioned table on column A. There is local index on column B. I am querying:
select * from my_table where A='ABC' and B>123.
I know that records with A='ABC' are in 2nd partition. Does only 2nd partition of local index will be scanned or all of them must be scanned?
I want to get clear with one thing yesterday i installed oracle9i and dev 2000 to my client.
when they run one report they got stuck with pl/sql compilation errorrep-1247
when i checked that report in the report builder, in the query they are using some other table which is not belongs to that schema,then I give that schema.tablename and compiled, but this is coming for other reports also, then only i came to know that they are acceessin other schema also, how can i sort this out.
can i fix this by givin full access privilige or what privilige can i give to get full access of other schema table.
how can i check in the old database what are all the roles and privileges given to this user,
Is there any hint to force "Index Unique Scan" over "Index Range Scan".
My query is generating different plans with the above two, and very slow when it uses "Index Range Scan".
i have been trying to create a user with full access on default Tablespace so that i can access all the objects without any restrictions for the new user.
View 7 Replies View RelatedWhen I invoke SOAP Web-Service using APEX_WEB_SERVICE.MAKE_REQUEST, then I'm able to get response from web-service. However all German character are replaced by JUNK data. However data is coming fine when I test web-services using SOAP UI.
I tried to invoke web-service using UTL_HTTP. However when I use UTL_HTTP, then I'm getting following error.
ORA-24247: network access denied by access control list
<li> Why German characters are replaced by Junk data while invoking web-service from APEX, while it's working fine from SOAP UI
<li> When I can access web-service successfully using APEX_WEB_SERVICE, then why it's throwing ORA-24247 error when I call using UTL_HTTP?
DB: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
APEX: 4.0.2.00.07
Web-Server: EPG
SELECT * FROM NLS_DATABASE_PARAMETERS;
[code]...
I was comparing cost of rebuild vs create index...I carried out the following test
SQL> create table t4 as select * from t1;
Table created.
SQL> create table t5 as select * from t1 where 1=2;
Table created.
SQL> create index i5 on t5(id);
Index created. SQL> select bytes,extents,blocks from user_segments where segment_name='I5';
BYTES EXTENTS BLOCKS
---------- ---------- ----------
65536 1 8
SQL> alter index i5 unusable;
Index altered.
SQL> alter table t5 nologging;
Table altered.
SQL> Alter session set skip_unusable_indexes=True;
Session altered.
SQL> insert /*+ append */ into t5 select * from t1;
563904 rows created.
SQL> commit;
Commit complete.
Now I compared the cost (elapsed time, logical I/O) of the operations
create index i4 on t4(id);
Vs
alter index i5 rebuild online;
Following is the related trace of above 2 steps
create index i4 on t4(id)
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.00 0.00 0 1 0 0
Execute 1 1.17 3.38 9497 7869 335 0
Fetch 0 0.00 0.00 0 0 0 0
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 2 1.17 3.38 9497 7870 335 0
Misses in library cache during parse: 1
Optimizer goal: CHOOSE
Parsing user id: 5
[code]....
So which option we shall pick in such cases? {Of course I haven't set 'nologging' for the indices but it is same for both indices we are comparing}
I am having oracle database version 11.2.0.3.0 standard edition, where one of my users requirement is that he wanted to send mails from oracle database but he is getting below error
ORA-24247: network access denied by access control list (ACL)
ORA-06512: at "SYS.UTL_TCP", line 17
ORA-06512: at "SYS.UTL_TCP", line 267
ORA-06512: at "SYS.UTL_SMTP", line 161
ORA-06512: at "SYS.UTL_SMTP", line 197
ORA-06512: at "HF_REPORTING.SEND_MAIL", line 12
ORA-06512: at line 18
is it possible to send mails from oracle database in STANDARD Edition?
While Running the proc,it's raising the below error.
Error report:
ORA-24247: network access denied by access control list (ACL)
ORA-06512: at "SYS.UTL_TCP", line 17
ORA-06512: at "SYS.UTL_TCP", line 246
ORA-06512: at "SYS.UTL_SMTP", line 115
ORA-06512: at "SYS.UTL_SMTP", line 138
ORA-06512: at "LISTER_SHIFT.SOLN_GENERIC_SENDMAIL", line 33
ORA-06512: at line 1
[code]....
I am using Oracle9i Enterprise Edition Release 9.2.0.6.0 - 64bit Production.I have a table D_GEOGRAPHY_25729 in RDS schema and I have created a role ACC_D_TABLES logging as ADMIN.
Now I have given GRANT SELECT access for table D_GEOGRAPHY_25729 to role ACC_D_TABLES.
There is another schema TRANS in the same database which has the role ACC_D_TABLES. But after logging in this schema, I am not able to query directly from table D_GEOGRAPHY_25729. I need to use like below to access the table.
select * from RDS.D_GEOGRAPHY_25729 Having the correct role ACC_D_TABLES to TRANS schema, why should I use RDS.D_GEOGRAPHY_25729 ? Is it not possible without prefixing the RDS schema name?
It is possible when I create a public synonym for D_GEOGRAPHY_25729 in RDS schema, but if i do so everyone can access this table.
I have a schema TEST1 and it has a view 'TEST_VIEW'. I granted read only permission on the view to TEST2 schema. grant select on TEST_VIEW to TEST2.
But TEST2 is used by an application which requires to read view metadata and then sync with application afterwords start reading. Is there any special permission to grant to access metadata of the view / table.
We deleted millions of records from a table.
1.Is it necessary to reorganize a table and index after the deletion of records from table ? Because i see some change in table size after table and index reorganization.
2.Will re org table and index improve the database performance ?
I am working in all 3 environments: development , Test and Production. How can we access the tables created in one environment in the other environment. Also, request to share the SQL code for the same.
I am using Oracle Sql Developer tool.
How can we access a table from one database to another database on the same server.
Let us say One database is "A" and the Other database is "B" both databases are running on one server "ABCD".
My question is how can we access a table from database B to database A.
I am creating a table where ID is an integer and the where clause will always be in range(for e.g between 200 and 400).
for best performance which index can i create on table such that query runs faster ?(a)clustered(b)non-clustered(c)unique(d)both clustered and non clustered