Searching multiple databases...

I have a number of databases, all using the same schema, which I would like to search. I'm wondering what the best way forward is.
Options:-
Open a connection to each database, search them all separately, and then amalgamate the results into a single list. (slow ?)
Create a super database which contains the records of the smaller databases and search that in a single search. (how to replicate the data.. ?)
Are there any recommended solutions to this kind of scenario ?

I think I'm rapdily drawing that conclusion.
So the next question...
Is there a way in java of specifiying a low priority thread, that I could have running permanently as a local java application that crawled through the other databases and grabbed the data ?

Similar Messages

ADF search from multiple database

JDev 11.1.1.3
ADF BC & ADF Faces
I am having a requirement to build advance search functionality, wherein the result data will come from multiple databases. Let's say I have two different database DB1 and DB2. On click of 'search' button I need to query both the databases and populate the data in a single result table. what should be the approach?
Any pointer will be appreciated.
~Abhijit

You've essentially done my POJO approach using the AM as your POJO. Yes you can do it. No, it's not going to be horribly efficient. You'll also have to handle when the newly-created root AM gets closed - on second thought - I hate this approach. Me too - it's just a highly customised one-off solution suitable only as the last resort.
At least in this way, you'll have a chance of having the DB doing the filtering.Right on - let the framework do its job like it's designed to.
I also summarised my thoughts on this thread: Re: Oracle ADF Business Component - Various data source...
It's still 'nice and easy' to show 'search results' from different data sources in separate disjoint (but parameterised) 'regions', with each region displaying a task flow pointing to a different database.
The non-trivial bit is when there's a requirement to combine two data sets - especially large ones (and then make it behave like a normal collection).
I'd mostly never go down this route unless there's an exceptionally compelling need to do so.
On a case by case basis, i might consider:
1. Having a 'primary' database and expose a webservice on the 'secondary' one. Then fetch of a large data set from the secondary and filter it 'in memory' to match with the primary rows...
2. Normal/Materialised views over db links etc. -
Jang Vijay Singh

How can I search multiple columns in a SQL command of Union tables

Hi:
We have a database with tables that are nearly identical that we use for production and production history.
I have created an SQL command in Crystal 2008 to joins several of the tables and then added a "UNION" to connect the History and Prod tables.
I need to search multiple (3 total) columns for 5 different data types, to return the records being investigated. I tried this using an "OR" statement in the where clause and have had inconsistant results.
The first two or statement function perfectly the third works as long as the value being passed is numeric and the last two fail consistantly with invalid column name errors. It appears that crystal is getting confused and passing the wrong data type especially if I do a new search using a different option for the "?SearchParam"
Can some one offer some insite on how I can search these fields to return the record data needed
-- {?SearchParam} is the search parameter passed by Crystal that is a number 1 thru 5
-- {?Search_Val} is a parameter that is passed by Crystal that is a string of what to search for 1 = Numeric CMP ord #("TBSLI21"."LI21_OR_NO"), 2 = Numeric CI ord # ( "TBSLI33"."LI33_CI_OR_NO"),
--   3 =String Ext Sys ord string ("TBSLI33"."LI33_EXT_SYS_SL_OR_NO"), 4 = String CMP Grp string ("TBSLI21"."LI21_OP_GRP_NO"), 5 = composit string PP ord string ("TBSOP13"."OP13_CLR_DAY" & "TBSOP13"."OP13_PP_GRP_SEQ_NO" & "TBSOP13"."OP13_CELL_ID")
SELECT "TBSLI21"."LI21_OR_NO",
"TBSLI21"."LI21_SH_DT_SCDL",
"TBSLI21"."LI21_TS_EN_ORIG",
"TBSLI21"."LI21_TS_SHIP",
"TBSLI21"."LI21_SYS_ORD_CD",
"TBSLI21"."LI21_SHIP_ID",
"TBSLI21"."LI21_WRKST_ID",
"TBSLI21"."LI21_LI_NO",
"TBSLI33"."LI33_CI_OR_NO",
"TBSLI33"."LI33_EXT_SYS_SL_OR_NO",
"TBSLI21"."LI21_OP_GRP_NO",
"TBSLI21"."LI21_LI_STAT",
"TBSOP13"."OP13_OP_GRP_STAT",
"TBSLI31"."LI31_LI_EV_DTL_TX",
"TBSLI31"."LI31_DT_EN",
"TBSLI31"."LI31_TM_EN",
"TBSLI31"."LI31_LI_EV",
"TBSLI21"."LI21_OP_WSH_FLNM",
"TBSLI21"."LI21_PR_ITF_CD",
"TBSLI21"."MFG_PLANT_CD",
"MFG_PLANT_LI"."MFG_PLANT_CD" as PrefPlant,
"TBSOP13"."OP13_OP_GRP_DSP_CD",
"TBSLI21"."LI21_LI_DSP_CD",
"TBSOP13"."OP13_CLR_DAY",
"TBSOP13"."OP13_PP_GRP_SEQ_NO",
"TBSOP13"."OP13_CELL_ID",
"MFG_PLANT_LI"."PRFR_MFG_PLANT_FLG",
"TBSLI21"."LI21_OP_GRP_PS_NO1",
"TBSLI21"."LI21_POMS_MERGE_NO",
"TBSLI31"."LI31_OP_ID",
"TBSLI21"."LI21_LI_POR_FG",
"TBSLI21"."LI21_BIN_ID",
"TBSLI21"."LI21_TS_MRSHL",
"TBSLI33"."LI33_CI_LI_NO",
"TBSLI33"."LI33_SH_ADDR_1",
"TBSLI33"."LI33_SH_ADDR_2",
"TBSLI33"."LI33_SH_ADDR_3",
"TBSLI33"."LI33_SH_ADDR_4",
"TBSLI33"."LI33_SH_CITY_NM",
"TBSLI33"."LI33_SH_ST_NM",
"TBSLI33"."LI33_SH_ZIP_CD",
"TBSLI33"."LI33_CU_NM",
"TBSLI33"."LI33_CU_BUS_NM"
FROM   ((("CMPREPORTING"."dbo"."TBSLI33" "TBSLI33" FULL OUTER JOIN "CMPREPORTING"."dbo"."TBSLI21" "TBSLI21" ON ("TBSLI33"."LI33_BS_OR_NO"="TBSLI21"."LI21_OR_NO") AND ("TBSLI33"."LI33_BS_LI_NO"="TBSLI21"."LI21_LI_NO")) LEFT OUTER JOIN "CMPREPORTING"."dbo"."TBSOP13" "TBSOP13" ON "TBSLI21"."LI21_OP_GRP_NO"="TBSOP13"."OP13_OP_GRP_NO") LEFT OUTER JOIN "CMPREPORTING"."dbo"."TBSLI31" "TBSLI31" ON ("TBSLI21"."LI21_OR_NO"="TBSLI31"."LI31_OR_NO") AND ("TBSLI21"."LI21_LI_NO"="TBSLI31"."LI31_LI_NO")) LEFT OUTER JOIN "CMPREPORTING"."dbo"."MFG_PLANT_LI" "MFG_PLANT_LI" ON ("TBSLI21"."LI21_OR_NO"="MFG_PLANT_LI"."OR_NO") AND ("TBSLI21"."LI21_LI_NO"="MFG_PLANT_LI"."LI_NO")
WHERE   {?aSearchParam} = 1 and "MFG_PLANT_LI"."PRFR_MFG_PLANT_FLG"='Y' AND "TBSLI21"."LI21_OR_NO"=Cast( {?Search_Val} as Int)
or {?aSearchParam} = 2 and "MFG_PLANT_LI"."PRFR_MFG_PLANT_FLG"='Y' AND "TBSLI33"."LI33_CI_OR_NO"=Cast( {?Search_Val} as numeric(12,0))
or {?aSearchParam} = 3 and "MFG_PLANT_LI"."PRFR_MFG_PLANT_FLG"='Y' AND Convert( VarChar(20),"TBSLI33"."LI33_EXT_SYS_SL_OR_NO")= Convert( VarChar(20), {?Search_Val})
or {?aSearchParam} = 4 and "MFG_PLANT_LI"."PRFR_MFG_PLANT_FLG"='Y' AND Convert( VarChar(8),"TBSLI21"."LI21_OP_GRP_NO") = Convert( VarChar(8), {?GroupNo})
or {?aSearchParam} = 5 and "MFG_PLANT_LI"."PRFR_MFG_PLANT_FLG"='Y' AND Convert( VarChar(8), ("TBSOP13"."OP13_CLR_DAY" & "TBSOP13"."OP13_PP_GRP_SEQ_NO" & "TBSOP13"."OP13_CELL_ID")) = Convert( VarChar(8), {?GroupNo})
Union
SELECT "TBSLI21_HIST"."LI21_OR_NO",
"TBSLI21_HIST"."LI21_SH_DT_SCDL",
"TBSLI21_HIST"."LI21_TS_EN_ORIG",
"TBSLI21_HIST"."LI21_TS_SHIP",
"TBSLI21_HIST"."LI21_SYS_ORD_CD",
"TBSLI21_HIST"."LI21_SHIP_ID",
"TBSLI21_HIST"."LI21_WRKST_ID",
"TBSLI21_HIST"."LI21_LI_NO",
"TBSLI33_HIST"."LI33_CI_OR_NO",
"TBSLI33_HIST"."LI33_EXT_SYS_SL_OR_NO",
"TBSLI21_HIST"."LI21_OP_GRP_NO",
"TBSLI21_HIST"."LI21_LI_STAT",
"TBSOP13_HIST"."OP13_OP_GRP_STAT",
"TBSLI31_HIST"."LI31_LI_EV_DTL_TX",
"TBSLI31_HIST"."LI31_DT_EN",
"TBSLI31_HIST"."LI31_TM_EN",
"TBSLI31_HIST"."LI31_LI_EV",
"TBSLI21_HIST"."LI21_OP_WSH_FLNM",
"TBSLI21_HIST"."LI21_PR_ITF_CD",
"TBSLI21_HIST"."MFG_PLANT_CD",
"MFG_PLANT_LI_HIST"."MFG_PLANT_CD",
"TBSOP13_HIST"."OP13_OP_GRP_DSP_CD",
"TBSLI21_HIST"."LI21_LI_DSP_CD",
"TBSOP13_HIST"."OP13_CLR_DAY",
"TBSOP13_HIST"."OP13_PP_GRP_SEQ_NO",
"TBSOP13_HIST"."OP13_CELL_ID",
"MFG_PLANT_LI_HIST"."PRFR_MFG_PLANT_FLG",
"TBSLI21_HIST"."LI21_OP_GRP_PS_NO1",
"TBSLI21_HIST"."LI21_POMS_MERGE_NO",
"TBSLI31_HIST"."LI31_OP_ID",
"TBSLI21_HIST"."LI21_LI_POR_FG",
"TBSLI21_HIST"."LI21_BIN_ID",
"TBSLI21_HIST"."LI21_TS_MRSHL",
"TBSLI33_HIST"."LI33_CI_LI_NO",
"TBSLI33_HIST"."LI33_SH_ADDR_1",
"TBSLI33_HIST"."LI33_SH_ADDR_2",
"TBSLI33_HIST"."LI33_SH_ADDR_3",
"TBSLI33_HIST"."LI33_SH_ADDR_4",
"TBSLI33_HIST"."LI33_SH_CITY_NM",
"TBSLI33_HIST"."LI33_SH_ST_NM",
"TBSLI33_HIST"."LI33_SH_ZIP_CD",
"TBSLI33_HIST"."LI33_CU_NM",
"TBSLI33_HIST"."LI33_CU_BUS_NM"
FROM   ((("CMPREPORTING"."dbo"."TBSLI33_HIST" "TBSLI33_HIST" FULL OUTER JOIN "CMPREPORTING"."dbo"."TBSLI21_HIST" "TBSLI21_HIST" ON ("TBSLI33_HIST"."LI33_BS_OR_NO"="TBSLI21_HIST"."LI21_OR_NO") AND ("TBSLI33_HIST"."LI33_BS_LI_NO"="TBSLI21_HIST"."LI21_LI_NO")) LEFT OUTER JOIN "CMPREPORTING"."dbo"."TBSOP13_HIST" "TBSOP13_HIST" ON "TBSLI21_HIST"."LI21_OP_GRP_NO"="TBSOP13_HIST"."OP13_OP_GRP_NO") LEFT OUTER JOIN "CMPREPORTING"."dbo"."TBSLI31_HIST" "TBSLI31_HIST" ON ("TBSLI21_HIST"."LI21_OR_NO"="TBSLI31_HIST"."LI31_OR_NO") AND ("TBSLI21_HIST"."LI21_LI_NO"="TBSLI31_HIST"."LI31_LI_NO")) LEFT OUTER JOIN "CMPREPORTING"."dbo"."MFG_PLANT_LI_HIST" "MFG_PLANT_LI_HIST" ON ("TBSLI21_HIST"."LI21_OR_NO"="MFG_PLANT_LI_HIST"."OR_NO") AND ("TBSLI21_HIST"."LI21_LI_NO"="MFG_PLANT_LI_HIST"."LI_NO")
WHERE {?aSearchParam} = 1 and "MFG_PLANT_LI_HIST"."PRFR_MFG_PLANT_FLG"='Y' AND "TBSLI21_HIST"."LI21_OR_NO"= Cast( {?Search_Val} as Int)
or {?aSearchParam} = 2 and "MFG_PLANT_LI_HIST"."PRFR_MFG_PLANT_FLG"='Y' AND "TBSLI33_HIST"."LI33_CI_OR_NO"= Cast( {?Search_Val} as numeric(12,0))
or {?aSearchParam} = 3 and "MFG_PLANT_LI_HIST"."PRFR_MFG_PLANT_FLG"='Y' AND Convert( VarChar(20), "TBSLI33_HIST"."LI33_EXT_SYS_SL_OR_NO")= Convert( VarChar(20),{?Search_Val})
or {?aSearchParam} = 4 and "MFG_PLANT_LI_HIST"."PRFR_MFG_PLANT_FLG"='Y' AND Convert( VarChar(8),"TBSLI21_HIST"."LI21_OP_GRP_NO")= Convert( VarChar(8), {?GroupNo} )
or {?aSearchParam} = 5 and "MFG_PLANT_LI_HIST"."PRFR_MFG_PLANT_FLG"='Y' AND Convert( VarChar(8), ("TBSOP13_HIST"."OP13_CLR_DAY" & "TBSOP13_HIST"."OP13_PP_GRP_SEQ_NO" & "TBSOP13_HIST"."OP13_CELL_ID")) = Convert( VarChar(8), {?GroupNo})

This is actually a fairly easy fix - because of the way the "OR" works in SQL, you need to surround each "set" of statements in the or with parentheses. So, it would look something like this:
Where
({?aSearchParam} = 1 and "MFG_PLANT_LI"."PRFR_MFG_PLANT_FLG"='Y' AND "TBSLI21"."LI21_OR_NO"=Cast( {?Search_Val} as Int))
or
({?aSearchParam} = 2 and "MFG_PLANT_LI"."PRFR_MFG_PLANT_FLG"='Y' AND "TBSLI33"."LI33_CI_OR_NO"=Cast( {?Search_Val} as numeric(12,0)))
or
({?aSearchParam} = 3 and "MFG_PLANT_LI"."PRFR_MFG_PLANT_FLG"='Y' AND Convert( VarChar(20),"TBSLI33"."LI33_EXT_SYS_SL_OR_NO")= Convert( VarChar(20), {?Search_Val}))
or
({?aSearchParam} = 4 and "MFG_PLANT_LI"."PRFR_MFG_PLANT_FLG"='Y' AND Convert( VarChar(8),"TBSLI21"."LI21_OP_GRP_NO") = Convert( VarChar(8), {?GroupNo}))
or
({?aSearchParam} = 5 and "MFG_PLANT_LI"."PRFR_MFG_PLANT_FLG"='Y' AND Convert( VarChar(8), ("TBSOP13"."OP13_CLR_DAY" & "TBSOP13"."OP13_PP_GRP_SEQ_NO" & "TBSOP13"."OP13_CELL_ID")) = Convert( VarChar(8), {?GroupNo}))
-Dell

Multiple databases in one single RAC cluster

Hi, I would like to know if one can have multiple databases running on a single RAC cluster, we have several databases in our shop and would like to consolidate all of them into a single 3-4 node RAC cluster running databases with 10.2 and 11.1 versions.
I am newbie to RAC and would like to get some clarification if anyone has done this, google search comes up with few hits on this topic, so obviously this is not doable.
In our case we have one database supporting critical applications and few other not so critical but are used very extensively between 9-5, so what is the use of RAC if I cannot consolidate all my databases into one cluster, or if I need a separate cluster for each of these critical databases?
I have been all the Oracle docs that keep repeating one database multiple instances and one instance-one machine-one node, they don't even advise running multiple instances on a single node?.
I appreciate any insight.
Thanks.

ora-sql-dba wrote:
Can you give more details on how you would setup multiple databases running different versions on a single RAC cluster, I am yet to find any documentation that supports or even elaborates on this topic.You can configure a cluster with 12 nodes. Then, using dbca, configure a dev instance for nodes 1 and 2, a prod1 instance for nodes 3 to 6 and a prod2 instance for nodes 7 to 12.
You also can configure each of these instances for all 12 nodes. And use it on all 12 nodes.
Or, after configuring it for all 12 nodes, you can start the dev instance on nodes 1 and 2, prod1 on 3 - 6 and prod2 on the remaining nodes. If dev needs more power, you can for example shutdown prod2 on node 12 and start another dev instance there.
My issue is with the 2nd option - running more than one instance on the same node or server. Why? Each instance has a basic resource footprint ito shared memory needed, system processes required (like db writer, log writer, sys monitor) etc. It does not make sense to pay for that same footprint more than once on a server. Each time you do, you need to reduce the amount of resources that can be used by each instance.
So instead of using (for example) 60% of that server's memory as the SGA for a single instance, if you use 2 instances on that server you now have to reduce the SGA of each to 30% of system memory. Effectively crippling those instances by 50% - they will now have smaller buffer caches, require more physical I/O and be more limited in what they can do.
So unless you have very sound technical reasons for running more than one instance on a server (RAC or non-RAC), do not.

Searching AW database for range of dates in AW 6.2.4

I can no longer use my Microsoftworks 4 on eMac since doing a clean install of OS 10.4.11. Prior to that it worked fine in Classic mode. I copied Works folder from old Mac 6500 via home network using ethernet connection to router. Setup program became corrupted when copying from Mac 6500 to eMac, so now unable to use MSWorks. Database was pure simplicity for copying individual fields to next record, searching for range of dates, and matching records with partial string using "contains" function.
Now using AW 6.2.4 which is more powerful but not as simple to use. Is it possible to do any of those tasks in AW? If so, how?

1) copying data into a field in a record from the corresponding field in the preceding record
Not automatic, but no more complicated than copying the information from the first record, then command-down and command-V; command-down and command-V; command-down and command-V; etc.
2) matching records containing partial string
If the partial string is expected in a particular field, use the "Match Records..." dialog from the Organize menu. Looking for records containing the word, "hoopla" in the field named "event", enter the following command: FIND("oop",'event',1)
-- Note single quotes around the fieldname, and double quotes around text to be found. -- Search multiple fields by imbedding multiple FIND statements in an OR statement.

Multiple database vendor

What is the best way to search across multiple databases vendor (oracle and SQL server)?

What is the best way to search across multiple
databases vendor (oracle and SQL server)?Code a Factory class to handle this. And have all the drivers available. :-)

How do you run CalcMgrCmdLineLauncher.cmd for a ruleset that runs rules in multiple databases?

Hi all,
Just having recently upgraded to 11.1.2.2, I'm just trying to update our batch files to automate the running of some business rulesets using CalcMgrCmdLineLauncher.cmd. I can get business rules working ok, and rulesets that only run rules within the same database working, but I can't seem to get the rulesets running where the rules are running against multiple databases.
I know the syntax is CalcMgrCmdLineLauncher.cmd -f:%PWD% /A:%PlanAPP% /U:%RUNUSR% /D:%EssbCapexDB% /S:%BR%
but for the /D: argument, putting one of the databases in there doesnt work.
The batch runs, it even says its successful in the log but its too quick and looking at the job console it didnt run.
I can run the ruleset manually no problems.
Anyone know how to fix this?
Thanks

One stated to "search cmd, right click, and run as admininstrator" but where is this?
In the search field in your Vista start menu, type cmd
Next, right-click on the cmd that comes up and select "Run as administrator".

Multiple database members in a single Grid Row

Hi All,
I have created an FR report (9.3x) and getting the below error while trying to run the report via Web Preview.
5217: Error Processing Results;hasPovDims=1;povXML=<?xml version="1.0"?><datasources><datasource name="FIN QA" dsid="-117fcde3_132fd17f2f6_-771b" allowEdit="1"><dim name="Versions" dimIndex="0" dsName="FIN QA" keyDimName="Versions" memberName="Versions" displayName="Versions: Versions"/><dim name="Scenarios" dimIndex="4" dsName="FIN QA" keyDimName="Scenarios" memberName="Scenarios" displayName="Scenarios: Scenarios"/><dim name="Components" dimIndex="5" dsName="FIN QA" keyDimName="Components" memberName="Components" displayName="Components: Components"/><dim name="Customers" dimIndex="6" dsName="FIN QA" keyDimName="Customers" memberName="Customers" displayName="Customers: Customers"/><dim name="Assets" dimIndex="7" dsName="FIN QA" keyDimName="Assets" memberName="Assets" displayName="Assets: Assets"/></datasource><datasource name="FINDEF QA" dsid="-607fb334_128b79d246e_-7d0a" allowEdit="1"><dim name="Time Periods" dimIndex="1" dsName="FINDEF QA" keyDimName="Time Periods" memberName="Time Periods" displayName="Time Periods: Time Periods"/><dim name="Scenario" dimIndex="3" dsName="FINDEF QA" keyDimName="Scenario" memberName="SC_Actual" displayName="Scenario: SC_Actual"/><dim name="Versions" dimIndex="4" dsName="FINDEF QA" keyDimName="Versions" memberName="VR_Input_Version" displayName="Versions: VR_Input_Version"/><dim name="Customers_Region" dimIndex="6" dsName="FINDEF QA" keyDimName="Customers_Region" memberName="CU_NA" displayName="Customers_Region: CU_NA"/><dim name="Assets" dimIndex="7" dsName="FINDEF QA" keyDimName="Assets" memberName="Assets_NA" displayName="Assets: Assets_NA"/></datasource></datasources>
In my report I have selected 2 rows where I have selected @descendants of ccounts from one database which is FIN QA and in the second row I have selected @children of Accounts from another database which is FINDEF QA. I am using only ONE GRID here.
Is it not possibe to run a FR report by select members from multiple databases in a single grid??
Please have your valuable inputs.

Yes it possible to retrive data from multiple database using single grid.
Also there are few limitations namely:
Database connections must be of the same type (for example, both must be Essbase database connections or both must be Financial Management database connections).
Mismatched number of dimensions in the database connections may cause retrieval errors.
For more details refer to this link for details:-
http://www.oracle.com/technetwork/middleware/financial-management/tutorials/obe-multipledbs-086586.html
Cheers
Vikas Naidu

Use 1 listener for multiple database in a server

hi guys,
just want to check whether this is the right way to configure my Listener.ORA . I am using 1 listener.ora to listen for incoming request connection from remote client. There are multiple databases installed in a server.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = ora03)(PORT = 1521))
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = O11R2)
(ORACLE_HOME = /oracle/app/oracle/product/11.2.0/db_1)
(SID_NAME = O11R2)
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = O10G)
(ORACLE_HOME = /oracle/app/oracle/product/10.2.0/db_1)
(SID_NAME = O10G)
)sorry i am reading about it so did not install another database to test out. Just thinking in the line that it mention that the list of SID is refering to the multiple database that is installed in a server and i am using 1 listener.
Please further advice.

Shivananda Rao wrote:
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = ora03)(PORT = 1521))
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = O11R2)
(ORACLE_HOME = /oracle/app/oracle/product/11.2.0/db_1)
(SID_NAME = O11R2)
(SID_DESC =
(GLOBAL_DBNAME = O10G)
(ORACLE_HOME = /oracle/app/oracle/product/10.2.0/db_1)
(SID_NAME = O10G)
)Please use as above. You can have one listener for multiple databases.right right so it the pattern goes like this:
SID_LIST_LISTENER =
     (SID_LIST =
          (SID_DESC =
          (GLOBAL_DBNAME = AAAA)
          (ORACLE_HOME = /oracle/app/oracle/product/11.2.0/db_1)
          (SID_NAME = AAAA)
          (SID_DESC =
          (GLOBAL_DBNAME = BBBB)
          (ORACLE_HOME = /oracle/app/oracle/product/10.2.0/db_1)
          (SID_NAME = BBBB)
     )thanks !

Multiple databases in one file: a small snafu

Hello everyone,
Opening multiple databases in a single file is an administrative convenience. It is well explained in the manual (see db/docs/ref/am/opensub.html). Normally, there is little difference between databases in their own physical files or grouped together in a single physical file. There is one small sentence in the manual that says the following:
(begin fragment)
However, since multiple databases in a file exist in a single physical file, opening two databases in the same file simultaneously requires locking be enabled unless all of the handles are read-only. As the locks for the two databases can only conflict during page allocation, this additional locking is unlikely to affect performance.
(end fragment).
I didn't pay attention to it, except the "unlikely to affect performance" part which told me that I wasn't to worry about it. The sun was shining. Life was good.
And I was wrong. It was one of those "epic bug quests" I had to embark on, only to realise that it may not be a BDB bug, but my carelessnes. Nevertheless, I'm left with an uneasy feeling which I would like to explain here.
Consider BDB configured as a concurrent data store.
There are 2 threads. The first thread has the following pseudocode:
cursor1 = db1->cursor(...)
while(cursor1->c_get(... DB_NEXT...))
// 1
cursor2 = db2->cursor(...)
while(cursor2->c_get(... DB_NEXT...))
The second thread does only the following:
db3->put(...)
db1, db2 and db3 are all distinct databases. All cursors are read-only (the cursor implicitly used in db3->put is of course a write cursor).
While the first thread is running, the second thread executes db3->put(...) at "//1".
Question: what happens?
Answer 1: if db1, db2 and db3 reside in different physical files, nothing special happens. Everything proceeds as it should.
Answer 2: if db1, db2 and db3 reside in the same physical file, both threads block "sometimes".
The "sometimes" used here means "when the put operation in thread 2 needs to allocate a new page".
Reading the BDB source code is extraordinarily difficult (which says more about my limitations than about the clarity of the code) but here is what happens, as far as I could determine:
(thread 1) cursor1 needs and acquires a read lock on db1
(thread 2) db3->put needs a write lock on db2 to allocate a new page. Since db2 is in the same physical file as db1 and thread 1 already has a read lock, thread 2 waits until the read lock is released. Thread 2 blocks.
(thread 1) cursor 2 needs a read lock on db3. For some reason, BDB detects that the another thread is waiting for a write lock on the physical file, and thread 1 blocks.
Both threads block waiting on each other to complete.
I suppose the system is the way it is to avoid starvation, but there you have it: be careful when you're lumping together multiple databases in one file!
Anyone who can clarify or confirm this is welcome.
Vincent

I had experienced a similar problem. I run multiple process. Each one of them starts a transaction that does db->put and db->pget to its own database (which also has a secondary index). When each database is in a separate physical file there is no problem but when I put all databases in a single file the processes start to dead-lock.
The following combination of options solved the deadlocking problem:
- use serializable isolation level instead of snapshot, i.e. do not pass DB_TXN_SNAPSHOT to txn_begin
- do not pass the DB_NO_WAIT option to txn_begin
- use Btree instead of a Hash
Hope that helps.

Can you have multiple databases on the same LUN in Exchange 2010?

I'm sure you can but is it possible with exchange 2010 to have multiple databases on the same LUN. We currently have 8 DB's all writing to their own DB drive and separate log drive so 16 drives in total. I need to spin a new DB up this week and
wanted to double check this is possible. I've looked online and cant find anything that I've seen before that says this is possible.
Thanks.

Hi,
Yes, multiple databases could be placed on the same LUN, but it's not recommended.
If you have 2 drives fail at the same time (it happens more than you think), then losing 100% of your DBs is a lot worse than losing one of them or some of them depending on where the failures are.
Here is a similar thread for your reference:
Multiple databases on the same LUN in Exchange 2010
Hope this helps!
Thanks.
Niko Cheng
TechNet Community Support

How to access multiple database present in single instance

Hi Team,
In oracle 11.2, can there be multiple databases in an instance??? In one of our environment, I could see multiple databases in an instance. Could you please help me in giving the data dictionary or query to access those databases?
Actually, querying v$database, I could see only one database which is same as instance name. But in inventory, there are multiple database in an instance?
I am still not exactly clear about this. Can someone help me with this?
Thanks!
Vidhya

In Oracle one instance manages one (1) database. A database consists of multiple *schemas*.
Other vendors erroneously call a schema 'database'.
So, no, you didn't see multiple databases.
There is also one datadictionary, consisting of a set of views.
All views beginning with dba_ list the entire database, all schemas.
All views beginning with all_ list the objects you have access to.
All views beginning with user_ list your own objects.
The view DICT show you the contents of the datadictionary.
Oracle also has online documentation at http://docs.oracle.com
From your question it is clear you should read the document called the 'Oracle Concepts Manual'.
You can find all documentation for 11gR2 here Oracle Database Online Documentation 11g Release 2 (11.2)
Too many people here don't make any effort to read it. This is probably the reason why you got no response.
Sybrand Bakker
Senior Oracle DBA

TDE Wallets & Multiple Databases on same Host

The Oracle TDE Best Practices (doc ID 130696) states this:
Multiple databases on the same host
If there are multiple Oracle Databases installed on the same server, they
must access their own individual TDE wallet. Sharing the same wallet between independent instances is not supported
and can potentially lead to the loss of encrypted data.
If the databases share the same ORACLE_HOME, they also share the same
sqlnet.ora file in $TNS_ADMIN . In order to access their individual wallet, the
DIRECTORY entry for the ENCRYPTION_WALLET_LOCATION
needs to point each database to its own wallet location:
DIRECTORY= /etc/ORACLE/WALLETS/$ORACLE_UNQNAME
The names of the subdirectories under /etc/ORACLE/WALLETS/ reflect
the ORACLE_UNQNAME names of the individual databases.
If the databases do not share the same ORACLE_HOME, they will also have their individual sqlnet.ora
files that have to point to the individual subdirectories.
What is the correct sqlnet.ora syntax to do this? I currently have what is below but it doesn't seem to be correct:
ENCRYPTION_WALLET_LOCATION =
(SOURCE = (METHOD = FILE)
(METHOD_DATA =
(DIRECTORY = /local/oracle/admin/wallet/DB#1)
(DIRECTORY = /local/oracle/admin/wallet/DB#2)

Hi,
You can check this :Setting ENCRYPTION_WALLET_LOCATION For Wallets Of Multiple Instances Sharing The Same Oracle Home (Doc ID 1504783.1)
i haven't done this for multiple database, but as per Doc you can use the syntex like
ENCRYPTION_WALLET_LOCATION =
(SOURCE = (METHOD = FILE)
(METHOD_DATA =
(DIRECTORY = /local/oracle/admin/wallet/$ORACLE_UNQNAME)
Whenever you set the Environmnet with
export $ORACLE_UNQNAME=DB#1
it will choose the file from respective directory like /local/oracle/admin/wallet/DB#1
HTH

How do i create multiple databases on the same unix box?

Hello experts.
Please send me some guidelines on how to create multiple databases on the same unix box and how to configure their startups including listeners.
Please also, list me the possible precautions to takes especially if the existing database is a production one!
thanks very much for you reply
Best Regards
Yogeeraj

Hello,
I tried the following:
svrmgrl> startup nomount pfile=I:\d01\oracle\admin\cmttest\pfile\init.ora
then
svrmgrl> CREATE DATABASE cmttest
LOGFILE 'i:\d01\oracle\oradata\cmttest\redo01.log' SIZE
1024K,'i:\d01\oracle\oradata\cmttest\redo02.log' SIZE 1024K
MAXLOGFILES 32
MAXLOGMEMBERS 3
MAXLOGHISTORY 1
DATAFILE 'i:\d01\oracle\oradata\cmttest\system01.dbf' SIZE 50M REUSE
MAXDATAFILES 254
MAXINSTANCES 1
CHARACTER SET WE8ISO8859P1
NATIONAL CHARACTER SET WE8ISO8859P1;
Then when i try to run both databases:
svrmgrl> set instance cmttest
ORA-12500: TNS: Listener failed to start a dedicated process
===================
I am doing something wrong.
please help
Regards
Yogeeraj

Multiple databases in a single query

I need to query multiple databases in a single query.
e.g.
Database d1 contains table t1 with column id
Database d2 contains table t2 with column id
I need a query like
SELECT * FROM t1, t2 WHERE t1.id = t2.id;
is this possible in jdbc? if yes can anyone help with some sample code?
thanks,
Ashish Saraf

It is not possible using the JDBC API to query tables in two or more databases using a single query. The reason is that a JDBC Connection is made to a single data source.
However, some databases support the idea of federations or linked tables. What you do is inside the database manager link or federate a table that is present in another DBMS. Then, pose a single JDBC query to the one DBMS which will have its own table and links to the external tables.
Another approach is to use a special JDBC driver with a built-in integration engine that will perform a query across multiple databases. In effect, the system poses separate queries to the different databases and integrates and joins the data together for you automatically on the client-side. That is much easier than doing it yourself in code, but that is also possible for simple queries.
As part of my research program, we have released a shareware version of the UnityJDBC driver that can query multiple databases using a single SQL query. For more information, see:
http://www.unityjdbc.com
http://www.cs.uiowa.edu/~rlawrenc/research/projects.html
Sincerely,
Dr. Ramon Lawrence
Assistant Professor
Department of Computer Science
University of Iowa
[email protected]

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