DBLink Not Querying Remote Table
Apr 16, 2013
I successfully created the following DBLink in my DEV environment:
CREATE PUBLIC DATABASE LINK PROD
CONNECT TO USER1 IDENTIFIED BY pwd98
USING 'PRD';
I have a table in both schemas. In PROD it has 0 recs, in DEV it has 134 recs.
select count(*) from hold@PROD.
The above query gives me 134 recs instead of 0!
Here is my TNSNAMES entry for PRD:
PRD=
(DESCRIPTION=
(ADDRESS=
(PROTOCOL=TCP)
(HOST=localhost)
(PORT=1529)
)
(CONNECT_DATA=
(SERVER=dedicated)
(SERVICE_NAME=PRD_USR)
))
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May 21, 2010
We have created a new db link. But we are not able access the remote database. When we are trying to access any table using db link system is getting hanged.
We would like to know what are the parameters/permissions which affect the db link access either at data base level or at server level.
One observation we made is that that particular db link is not getting dropped when we tried to drop it.
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Jul 5, 2012
I am trying to subtract the time from where status = Delivered from the status = Picked Up. All the data is in the same table. Let's call it table1 and I want to return the values: PTN, NAME and the time difference. Is this possible to do?
PTN NAME DATE STATUS
11014419 Joe Dickson 2012-06-25 14:55:58 Delivered
11014419 Mike Draia 2012-06-25 14:28:17 Loaded
11014419 Bob Geber 2012-06-25 13:14:31 Received
11014419 Bob Geber 2012-06-25 13:14:31 Picked Up
11014419 Bob Geber 2012-06-25 13:14:31 Printed
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Apr 21, 2012
I have flattened customer dimension table and I would like to query it with other dimension table like address. I write a query, where I join address table twice to get permanent, secondary, and work addresses, but customer and address tables are huge that causing performance issue. Is any other ways to join flatten table with address dimensions than join it twice.
CREATE TABLE CUSTOMER
(
cust_sk NUMBER NOT NULL ,
cust_src_id VARCHAR2(20) NOT NULL ,
rec_eff_dt DATE NOT NULL ,
last_name VARCHAR2(75) NULL ,
first_name VARCHAR2(30) NULL
brth_dt DATE NULL ,
[code]......
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Aug 14, 2012
We are using oracle database 11g R2 on REL 5 and i have an SQL server database used by one of our application. In my Oracle database, i want to query one table in my SQL server database and to link it in a table in Oracle database to compare data.
Is there a way like database link or something else to do this need. Send a link or pots here step by step the way on how to accomplish my query.
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Oct 9, 2013
I have table with 129 million records.
If I just to select count(*) on the table its taking more than a minute in Sql Developer.
The table structure is as below, Primary key is a sequence and then 3 foriegn keys and one non-unique index on the date column.
<Table_Name>
column1 NOT NULL NUMBER ( Primary Key)
column2 NOT NULL NUMBER ( FK1)
[Code].....
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Nov 11, 2012
The Item data for individual cycles is as below.
Item_tbl
ItemRundate StddateStatus
P103-Nov-1203-Nov-12A
P104-Nov-1204-Nov-12D
P2 04-Nov-1203-Nov-12A
The requirement is I have to get the details of all data of previous Active cycle(status A) when the Item became disabled(status = D) for Input date.
In above case,since for Item P1 and on cycle date 04-Nov-12,status is D,I have to consider the previous active cycle which is 03-Nov-12. Based on above std date,the data is queried from another table to get all the Items. Item P2 should not be considered in above case.
Below is the code which I have written which considers the rundate as Input parameter.
-- To get the Items disabled for Input date
with Itemdisabled as
(
select item,stddate maxcycledate
from Item_tbl
where rundate = stddate
[code]....
In above case,I'm querying the Item_tbl twice once for getting the disabled Items and once for getting the Previous cycle which is active.
Is there any way to query above only once and get the required results using Lag/Lead functions etc.
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Aug 6, 2010
DB1: Sql Server
DB2: Oracle 11g
Is it possible to create a MV log against table@DB1? If not, then am I limited to refresh complete if I need to create MVs against @DB1?
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Sep 7, 2012
I am trying to generate some statistics on tables connected by a dblink. I know with oracle you have table_columns which you can reference and pull some stats from.
Trying to get the column count and record counts for each table connected by a dblink. I have tried these queries below to see if I could see any db properties: (some just to try something different)
select * from "table_owner".table_column@dblink ;
select * from "status"@dblink;
select /*DRIVING_SITE(a) */ count(*) from @dblink a;
What is the best method to finding this out without spending a lot of time? I have over 30 tables which are with large record sets and would love to learn a faster approach then pulling a sample table and doing a manual count and query for each table to count the rows.
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Aug 21, 2013
I have something strange :
I am executing a select on a single table using a dblink from oracle9 to oracle11 and i don't know why automatically add in the select the rowid at the end. The problem is that inside the query i have a group by so it crash.
Query sample :
original query from vb:
select a, b, c
from mytable
group by a, b, c
query intercepted on oracle11:
select a, b, c, rowid
from mytable
group by a, b, c
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May 12, 2011
we are facing an issue with the dbms scheduler jobs, which is not processing the synonym which is created via dblink from anthoer schema.
Let me explain the situation.
Table in Schema :APP_COMMON DB: APPL
-------------------------------------
CREATE TABLE TEST_LOG (A VARCHAR2(10));
INSERT TEST_LOG VALUES ('TESTED');
GRANT SELECT ON TEST_LOG to APP_GEN ;
Table in Schema :APP_GEN DB: APPL
-------------------------------------
CREATE SYNONYM TEST_LOG FOR APP_COMMON.TEST_LOG;
SELECT * from TEST_LOG;
-- it returns the value
Table in Schema :APP_GEN DB: REPORT
-------------------------------------
This is the different DB (we have 2 DB's, one for report db and one for application DB). here we create the DB link (connected DB menthod) . Since we have the password sync between the databases, we create the DBLINK without user id and password.
CREATE DATABASE LINK "APPL_LINK"
USING 'APPL' ;
CREATE SYNONYM TEST_LOG FOR TEST_LOG@APPL_LINK;
SELECT * from TEST_LOG;
--it returns the value.
Now in the same DB, we have a scheduler which will run for every min.
Now Scheduler is not selecting this table. Rather not processing the synonym(TEST_LOG). Not able to capture the exception also.
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Feb 21, 2011
I have created a remote link to a sql server db in oracle 11.0.7 works fine in sql plus. I can select tables by select * from table@linkname...the link is a public link But when I put it in the procedure it says invalid table name. then I created a public synonym for the table - i can select from the synonym in sql plus - but in the procedure it says synonym translation invalid...Also I cant grant any privileges to the synonym as it says ddl operations are not allowed on remote objects
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Jan 30, 2009
How to access (create Synonym and Materialized View) a Table contains an Array of type object which is on Remote Database connecting through DBLink.
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Jun 18, 2013
I want to grant a privilege through an insert statement into a sys table.Why do not grant the privilege through the classic way : grant select on t to l_user; ?
Because I want to do it remotely.I am connected to db1.I want to grant select on t2 to u2_b from u2_a.I assume that all DDL are DML. So a grant is equivalent "somewhere" to an insert.I tried to do my requirement locally, and here is the output.
SQL> conn scott/aa
Connecté.
SQL> -- step 1 : try to grant "normally" a select on dept to hr from scott
SQL> grant select on dept to hr;
Autorisation de privilèges (GRANT) acceptée.
SQL>
SQL> conn sys/a as sysdba
Connecté.
SQL> -- step 2 : Then, we connect to sys to see the row inserted in dba_tab_privs
SQL>
SQL> col GRANTEE format A10
SQL> col OWNER format A10
[code]...
Then if I can do it locally, I can do it remotely through a db link.
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Jul 18, 2012
Does it possible to pass object (or) table as an argument to a remote procedure?
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May 1, 2012
I need a way to ftp file to remote server by reading data from table. I searched a couple of sites which asked me to use Chris xutl_ftp package..but unfortunately the site is no accessible..
Here is the code
CREATE OR REPLACE PACKAGE UTL_FTP
AUTHID CURRENT_USER
AS
/**
* LICENSE: GNU Lesser General Public License (LGPL)
* Copyright (C) 2003-2006 Russ Johnson (john_2885@yahoo.com)
[code].....
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May 20, 2010
I have the following 3 columns in my VERSIONS table.
MAJOR
MINOR
MICRO
The MAJOR,MINOR and MICRO columns create a unique composite primary key. I need to query out the last version by doing the following 3 queries and combine them.
select max(major) as max_major from versions
select max(minor) as max_minor from versions where major = :max_major
select max(micro) as max_micro from versions where minor = max_minor and major = max_major
Is there any way I can query out max(major),max(minor),max(micro) in a single query.
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Jan 15, 2013
I'm having truble by querying a column in Oracle 10g. This is my situation I wrote a standard Oracle Query to show only the domain name of user's registration. The column's alias is called MAILS so far so good, the main problem is when I tried to shortener the result to show only Gmail, Hotmail and Yahoo.
Also I had the same issue when I tried to use GROUP BY the field "MAILS", but when I use the order by clause with that field it run perfectly. I think a test case is not necesarry because there are common mails address.
SELECT
SUBSTR(SUBSTR(mail,INSTR(mail,'@',1)+1,50),1,
INSTR(SUBSTR(mail,INSTR(mail,'@',1)+2,50),'.',1)) "MAILS",
COUNT(SUBSTR(SUBSTR(mail,INSTR(mail,'@',1)+1,50),1,
INSTR(SUBSTR(mail,INSTR(mail,'@',1)+2,50),'.',1))) "TOTAL"
FROM USER_REGISTRATION
WHERE TRUNC(FECHAALTA) BETWEEN TRUNC(TO_DATE('01/01/2012','DD/MM/YYYY')) AND TRUNC(TO_DATE('31/12/2012','DD/MM/YYYY'))
GROUP BY SUBSTR(SUBSTR(mail,INSTR(mail,'@',1)+1,50),1,
INSTR(SUBSTR(mail,INSTR(mail,'@',1)+2,50),'.',1))
ORDER BY MAILS DESC;
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Feb 2, 2011
I have a temporary table (with on commit preserve rows property) which is populated thru insert into command from a procedure. After which, i need to query the records from the populated temp table.
However, my query returns nothing. My procedure works fine cause i tried executing it to populate a regular table and it is ok. However, it shows no output in the temp table cause probably it is creating another session. How do i select the rows from the temp table after populating it from a procedure.
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Aug 23, 2007
SELECT * FROM table WHERE id = $x
$x being a range of non-consecutive values like so:
1,3,5-9,13,18,21 and so on...
I realize I can query using an array of operands and such, but these ranges will be in upwards of 100 or more items. I want to minimize the number of queries I have to do and the length of them. Is there any resource you can point me to that can optimize something like this?
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Mar 17, 2011
I have a CLOB column called XML_DATA that has (not-surprisingly) xml data in it that's housed inside a table called HMS_XML_TRANSFER. It has been giving me a headache because I'm unable at this point to use the xml field as a condition to get its TRANS_SEQUENCE number. The where clause doesn't work.
SELECT TRANS_SEQUENCE, XML_DATA
FROM HMS_XML_TRANSFER
WHERE EXTRACTVALUE(XMLTYPE (XML_DATA), '/INTERFACES/INTERFACE/BODY/IFI0057[ACTIVITY_CODE = "2201-020742"]');
The only test that I have been able to get working is the one below.
SELECT TRANS_SEQUENCE, EXTRACTVALUE(XMLTYPE (XML_DATA), '/INTERFACES/INTERFACE/BODY/IFI0057/ACTIVITY_CODE')
FROM HMS_XML_TRANSFER
WHERE TRANS_SEQUENCE = '8191602';
It will give me the ACTIVITY_CODE element so I know I can pull data from the XML but I can't do the reverse in the first example which is what I need because I don't know the TRANS_SEQUENCE number, I just know the ACTIVITY_CODE.
I have over 202 error messages logged in Teradata SQL from my many and varied attempts to get this to work using every example I could find online.
As an example this has not worked either...
WHERE EXISTNODE(XML_DATA, '/INTERFACES/INTERFACE/BODY/IFI0057[ACTIVITY_CODE = "2201-020742"]') = 1;
So the question... How do I properly form my SQL statement so I can use the XML column's ACTIVITY_CODE element to get the TRANS_SEQUENCE column field? Oh and I'd like to see both columns in the result.
Below is the version of Oracle I'm using, the description of the Table HMS_XML_TRANSFER, and a sample of the XML that comes from XML_DATA. I can't seems to get tabs working.
===============
ORACLE VERSION
===============
SQL*Plus: Release 9.0.1.3.0 - Production on Thu Mar 17 08:18:15 2011
Connected to:Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options
=========================
TABLE HMS_XML_TRANSFER
=========================
Name Null? Type
--------------- --------- --------------
TRANS_TYPE NOT NULL VARCHAR2(10)
DATE_IN NOT NULL DATE
DATE_PROCESSED DATE
STATUS VARCHAR2(8)
[code]....
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Apr 24, 2012
I am inserting data into a global temporary table and then using 'parallel' hint to query from this temporary table. I remember reading that the queries on the temp table may not run in parallel as the parallel sessions may not be able to see the data in the temporary table
However the execution plan as well as px_session, v$sql indicate that the query on the temporary table in fact run in parallel mode
select * from table(dbms_xplan.display_cursor(null,null,'ALLSTATS LAST'));
PLAN_TABLE_OUTPUT
-----------------------------------------------------------------------------------------------------------------------
SQL_ID 7d68g52g0mskz, child number 0
-------------------------------------
select /*+ gather_plan_statistics parallel(t,4) */ * from dbo_gtt t order by id,object_id
Plan hash value: 5815349
--------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | OMem | 1Mem | Used-Mem |Used-Tmp|
--------------------------------------------------------------------------------------------------------------------------
| 1 | PX COORDINATOR | | 1 | | 99999 |00:00:01.46 | 3 | | | |
|
| 2 | PX SEND QC (ORDER) | :TQ10001 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|
| 3 | SORT ORDER BY | | 0 | 1 | 0 |00:00:00.01 | 0 | 11M| 1311K| 424K (0)|
|
| 4 | PX RECEIVE | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|
| 5 | PX SEND RANGE | :TQ10000 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|
| 6 | PX BLOCK ITERATOR | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|
|* 7 | TABLE ACCESS FULL| DBO_GTT | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|
--------------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
7 - access(:Z>=:Z AND :Z<=:Z)
select px_servers_executions from v$sql where sql_text like 'select%dbo_gtt t%';
PX_SERVERS_EXECUTIONS
---------------------
0
4
select sid, qcsid, server#, degree from v$px_session where qcsid = 228;
SID QCSID SERVER# DEGREE
---------- ---------- ---------- ----------
247 228 1 4
196 228 2 4
224 228 3 4
234 228 4 4
226 228 1 4
252 228 2 4
212 228 3 4
229 228 4 4
228 228
9 rows selected.
unfortunately I do not have access to get trace (tkprof) report. What must have happened during the execution?
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Nov 14, 2011
I am using SQL Developer.I am self-teaching myself PL/SQL. What I am trying accomplish is to run a select query across many database links at runtime and to insert that query onto a local table. So far, I have only gotten as far as querying the database link names. I am stuck at where my variable calls the database link name. It does not recognize the database link name, and I can't quite grasp the reason why. Below is the first part of my script which does retrieves the column values no problem:
001 SET SERVEROUTPUT ON
002 DECLARE
003 db_link_varVARCHAR2(30);
004 source_cursorINTEGER;
005 destination_cursorINTEGER;
006 src_csrINTEGER;
007 dst_csrINTEGER;
008 rundate_varDATE;
009 instance_name_var VARCHAR2(30);
[code]....
If I break the script down to the bare select query, it will query absolutely fine.If I run the script in its entirety, it will not pick up the variable dbl as a dynamic database link. 02019. 00000 - "connection description for remote database not found"
If I comment out line 031 and prevent the looping of querying of database links (which will only fetch the first value of db_link from dba_db_links), the script will complete and I will have a row inserted into my local table.
I am suspecting it's the looping that is incorrect but I understand it is not going to do anything beyond line 059.
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Apr 16, 2012
I have a table in Oracle with a column userid and i have a userid column in Active Directory. based on this i want to query the Network ID and update in one of the Group in the Active Directory. how to get the results?
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Oct 14, 2013
Our company database is Oracle based and we use SQL Developer to pull out needed data.Using a snippet borrowed from a co-worker, I have put together a query that, among other things, pulls a list value out of an xml clob field and displays it in the query results. My query as it stands right now is below, followed by an example snippet of the xml clob that I am pulling from. The reason for the "query within a query" is because the base query could return multiple entries and I only want the one with the most recent date.
select * from
(Select Wtr_Service_Tag, Wtr_Tran_Origin, Wtr_Send_Date, Wtr_Receive_Date,
to_char(substr(wtr_req_xml,instr(substr(wtr_req_xml,1,8000),'SID')+8,12)) Asset_Tag
from ws_transactions
Where Wtr_Service_Tag In ('20458749610')
And Wtr_Req_Xml Like ('%CSM%')
Order By Wtr_Receive_Date Desc)
where rownum = 1;
[code]....
This query is only able to pull the first value in the list.How can I edit this query to pull all of the list items when there are more than 1 (preferably concatenated into one column in the query results)? I have another field, in a separate table, that I can pull from to get the number of list items.
This one may be more complex. As currently written, the query pulls a fixed number of characters from the xml clob and either returns not enough data, or too much because the values I need to pull could be of varying lengths. I have no way to query what those lengths might be.
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Feb 10, 2012
We have a table with huge data which is skewed on a 'status' column. The 'status' column has 6 distinct values with 1 particular value occupying 80-85% records.
In the batch process we query the data on the status and process the retrieved records. My senior is insisting on partitioning which I see not much feasible considering cost implications just for a part of functionality
See there are 6 status 'A','B','C','D','E','F'
with 'A' occupying 80% records
'B' to 'F' occupies 2% till 14% records in the table(approx)
1) Create a conditional index on status (using case) to have records with all statuses except 'A' Then create If-ELSE structure
IF input parameter is 'A'
select /*+ FULL Parallel(t) */ * from t where status='A';
ELSE
Select /*+ INDEX (t conditional_index) */ * from t where status in ('B','C');
END IF;
I want to create conditional index here for 2 reasons
1] since it will have values for status except 'A' this nullify the chance that this index will be picked up when status='A' will be queried
Thus making the performance worst (status ='A' is for 80% records) - The IF-ELSE is additional protection
2] Less impact on the DMLS as the index will not be on status='A' which contribute to large chunk of records
2)Populate a dummy table which would contain rowid and status. Since the business closes at 21:00 and batch process starts at 21:30
Between these times periods refresh the dummy table every day using merge (to catch business transactions during the day)
Now during the batch process retrieve records from the main table using the rowids in the dummy table depending on the input status value
3)Create index on status
Make sure hard coded status values are used in the database procedures
Gather stats with the histograms
And leave it to the Optimizer to choose the best possible path
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Nov 27, 2012
I am trying to fetch the data from system table "FLOWS_020100.WWV_FLOW_ACTIVITY_LOG1$" in Oracle Express edition 10.2.0.3 database, using the OCI library on Windows with C++
This table has a TIMESTAMP column of date type.
I've the following query as below:
select TIME_STAMP from FLOWS_020100.WWV_FLOW_ACTIVITY_LOG1$ where TIME_STAMP > to_date('31/OCT/12 23:59:59', 'DD-MON-YY HH24:MI:SS') order by TIME_STAMP asc;
For this, first I am preparing the query as below:
select TIME_STAMP from FLOWS_020100.WWV_FLOW_ACTIVITY_LOG1$ where TIME_STAMP > :PKVAL order by TIME_STAMP asc;
Before calling OCIExecute(), I am setting the PKVAL buffer to following value:
"to_date('31/OCT/12 23:59:59', 'DD-MON-YY HH24:MI:SS') "
& calling the OCIBindByName function with data type as SQLT_DATE.
But when the OCIExecute is called, my program crashes with access violation
what is the correct way to pass the date value in query to OCI? How do we bind the date values?
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Mar 26, 2013
I have installed unixodbc 2.3.1, postgres odbc driver (psqlodbc-07.03) and dg4odbc 11.2..On querying : select sysdate from dual@dblink_postgresql, the following error occurs:
ORA-28500: connection from ORACLE to a non-Oracle system returned this message:
[unixODBC][Driver Manager]Can't open lib '/oracle/psqlodbc/lib/libpsqlodbc.a' : file not found {01000}
ORA-02063: preceding 2 lines from DBLINK_POSTGRES
Similar error appears in the trace file as well.
[unixODBC][Driver Manager]Can't open lib '/oracle/psqlodbc/lib/libpsqlodbc.a'
$ isql -v postgresql postgres postgres@2012
[01000][unixODBC][Driver Manager]Can't open lib '/oracle/psqlodbc/lib/libpsqlodbc.a' : file not found
[ISQL]ERROR: Could not SQLConnect
However the file is present in the location and has no permission related problems.
$ pwd
/oracle/psqlodbc/lib
$ ls -lrt
total 2952
-rwxr-xr-x 1 oracle oinstall 663 Mar 25 15:28 psqlodbc.la
-rw-r--r-- 1 oracle oinstall 731419 Mar 25 15:28 libpsqlodbc.a
-rw-r--r-- 1 oracle oinstall 12215 Mar 25 22:11 win_md5.o
-rw-r--r-- 1 oracle oinstall 18100 Mar 25 22:11 options.o
[code]....
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Sep 25, 2012
query to get the name and size of all the databases associated to grid..
I need to find this to do capacity planning in our environment.
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Feb 23, 2011
I need to write several variations of this statement below to query a remote database, but am having trouble with the syntax.
execute immediate 'select count(*) from ' || v_tablename || '@dblink ' || into v_rowcount;
PLS-00103: Encountered the symbol "INTO"....
What's the correct way to format this kind of dynamic query?
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