Should i use cache group or a direct connection to oralce database?

I have a lot of data needs to be inserted into the ORACLE database in a short period of time ,the corresponding table with massive data, whether it can be used to achieve storage of high-speed TIMESTEN the high efficiency?

-->But I have know idea how to use a bean to store
something.
umm, ok, maybe "store" isn't really the best word; I
didn't mean it as a permanent storage, just a
temporary storage which exists while the application
is still running.well, you COULD serialize the bean, however i would not recommend this since you have no chance of changing this by hand. for configuration data an ascii based file storage is typically a good choice, be it a property file, an xml file or something different. however, depending on your application it might be reasonable to separate the mechanism that reads the data from the internal storage, i.e. you could provide a bean that contains the relevant data and some other class that creates the bean from some kind of persistent representation, i.e. file.
robert

Similar Messages

Should we Use cache seeding iBots to pre-cache the reports ?

Hi Everyone,
We have requirement from client to improve the performance of some reports.We have a very old RPD and it is really huge so we don't want to do much on database side for performance tuning.
Will it be a good idea to use cache seeding iBots to pre-cache the reports ?
Most of the reports which are having performance issue are having some 5-6 columns and one key column is having some 30+ choices in column selector.So for each column selector view we will have to create a ibot which will again be a huge task.Can you pls guide how to approach this?
Thanks in advance !
Aarti Chawla

hi Aarti,
Will it be a good idea to use cache seeding iBots to pre-cache the reports ?http://www.artofbi.com/index.php/2010/03/obiee-ibots-obi-caching-strategy-with-seeding-cache/
30+choices in column selector will definitely have performance issues..bcz each and every time the report is going to refresh .have u enabled the cache some what better .Whats the issue of using existing report by enabling the cache seeding in ibots?
Thanks,
Saichand.v

Airdrop using wireless network instead of direct connection

Hello,
Last night my fiancee and I were moving her backed up music folder from my computer onto her new macbook air '11. My computer is an '11 13" pro. When we were both connected to her wireless network and initiated the airdrop file transfer, it was using the wifi network to send the data which caused the older wrt54g router to max out on bandwidth so the transfer was going really slow (1 MB/s).
Then when I realized the transfer (27 GB) was going to take longer than I was going to be there, I decided to try and get the airdrop to work directly. I eventually had to delete her network from my list of favorites in network settings, turn off wi-fi, and turn it back on. Then once my pro was NOT connected to any networks, I initiated the transfer to her computer, and it was going closer to 10 MB/s. Thus, it was using the true direct connection airdrop is SUPPOSED to use.
Now, nowhere does any of the Apple documentation say "...and then you must disconnect from the wireless network common to the computers..." so I am left wondering if this is some bug or why I had to jump through these hoops in order to get the full transfer potential.
Has anyone else experienced this? And/or does this method work for anyone else?
Thanks,
William

There are only a few devices that have multiple uses. I use a DLink DWL G703AP on my daughter's iMac for wireless connectivity. If you look it up on the DLink site you can see its capabilities. I am sure there are other devices with similar capabilities.

What happens to cached entity beans when directly change record in database?

hi:
i am working on a project which weblogic as app server. there's many case
in my application where we have to update large number of records(about
fifty thousands) in
a loop one at a time. we have tried with entity beans but it 's so slow.
so in this case we have to update database directly. but i am worried about
my code accessing record with entity beans. the entities caches state and i
am
afraid there will be trouble if the state in ejb caches and record in db
mismatch . i change state in db directly and ejbs has no way to know about
it.
is there any solution?
thanks in advance!
daniel

Depends on the way you have implemented your entity bean. Normally, a bean
method invocation will trigger a transaction (based on the bean's method
transaction attribute), which will in turn call the ejbLoad(). In CMP's the
container will automatically load the data from the underlying datastore. In
BMP's a transactional method call will invoke the ejbLoad(), and the
ejbLoad() implementation would be responsible for loading the data.
"daniel wang" <[email protected]> wrote in message
news:3c5e01b9$[email protected]..
hi:
i am working on a project which weblogic as app server. there's manycase
in my application where we have to update large number of records(about
fifty thousands) in
a loop one at a time. we have tried with entity beans but it 's so slow.
so in this case we have to update database directly. but i am worriedabout
my code accessing record with entity beans. the entities caches state andi
am
afraid there will be trouble if the state in ejb caches and record in db
mismatch . i change state in db directly and ejbs has no way to know about
it.
is there any solution?
thanks in advance!
daniel

What proper headers should I use to succefully end handshake when connecting to WebSocket?

When I try to use WebSocket, my server on handshake send header like this:
$reply = "HTTP/1.1 101 Switching Protocols\r\n" .
"Upgrade: websocket\r\n" .
"Connection: Upgrade\r\n" .
"Sec-WebSocket-Accept: {$accept}\r\n\r\n";
But, FF doesn't really ends/accept (?) it... It just wainting, and after few sec it disconnect. In Chrome browser it works perfectly... :(

I realy REALY searched whole internet and I saw this page a lot of times and I have read RFC6455 milion times! Everything is 100% ok!... In Chrome it works just perfect, but in my favorite browser - FF <3 - no... :/

Error in creating Cache Group

Hi,
When i tried to create cache group i am getting below error
CREATE READONLY CACHE GROUP customer_orders
FROM myuser.customer
(cust_num NUMBER(6) NOT NULL,
region VARCHAR2(10),
name VARCHAR2(50),
address VARCHAR2(100),
PRIMARY KEY(cust_num)),
myuser.orders
(ord_num NUMBER(10) NOT NULL,
cust_num NUMBER(6) NOT NULL,
when_placed DATE NOT NULL,
when_shipped DATE NOT NULL,
PRIMARY KEY(ord_num),
FOREIGN KEY(cust_num) REFERENCES myuser.customer(cust_num)) ;
5220: Permanent Oracle connection failure error in OCIServerAttach(): ORA-12154: TNS:could not resolve the connect identifier specified rc = -1
5131: Cannot connect to backend database: OracleNetServiceName = "orcl_db", uid = "XXXXXXX", pwd is hidden, TNS_ADMIN = "C:\TimesTen11.2.2", ORACLE_HOME= ""
But my Oracle database Name is MYdatabase
Oracle LSNRCTL
LSNRCTL> status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1522)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for 32-bit Windows: Version 11.2.0.2.0 - Production
Start Date 07-AUG-2012 10:31:38
Uptime 4 days 3 hr. 1 min. 55 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File C:\TimesTen11.2.2\listener.ora
Listener Log File E:\app\XXXXXXX\diag\tnslsnr\localhost\listener\alert\log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1522ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1522)))
Services Summary...
Service "MYdatabaseXDB" has 1 instance(s).
Instance "MYdatabase", status READY, has 1 handler(s) for this service...
Service "MYdatabase" has 1 instance(s).
Instance "MYdatabase", status READY, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
Instance "orcl", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
how to change OracleNetServiceName = "orcl_db" to OracleNetServiceName = "MYdatabase"
Thanks!

You should create the cache groups by using cachadmin user, not use object owner user.
In Oracle DB:
SQL> @grantCacheAdminPrivileges "cacheadmin"
Please enter the administrator user id
The value chosen for administrator user id is cacheadmin
***************** Initialization for cache admin begins ******************
0. Granting the CREATE SESSION privilege to CACHEADMIN
1. Granting the TT_CACHE_ADMIN_ROLE to CACHEADMIN
2. Granting the DBMS_LOCK package privilege to CACHEADMIN
3. Granting the RESOURCE privilege to CACHEADMIN
4. Granting the CREATE PROCEDURE privilege to CACHEADMIN
5. Granting the CREATE ANY TRIGGER privilege to CACHEADMIN
6. Granting the DBMS_LOB package privilege to CACHEADMIN
7. Granting the SELECT on SYS.ALL_OBJECTS privilege to CACHEADMIN
8. Granting the SELECT on SYS.ALL_SYNONYMS privilege to CACHEADMIN
9. Checking if the cache administrator user has permissions on the default
tablespace
     Permission exists
11. Granting the CREATE ANY TYPE privilege to CACHEADMIN
********* Initialization for cache admin user done successfully *********
SQL>In TimesTen:
Command> CREATE USER cacheadmin IDENTIFIED BY oracle;
User created.
Command> GRANT CREATE SESSION, CACHE_MANAGER, CREATE ANY TABLE, DROP ANY TABLE TO cacheadmin;
Command>
Command> CREATE USER oratt IDENTIFIED BY oracle;
User created.
Command> grant create session to oratt;
Command>
[oracle@tt1 ~]$ ttIsql "DSN=db_cache;UID=cacheadmin;PWD=oracle;OraclePWD=oracle"
Copyright (c) 1996-2010, Oracle. All rights reserved.
Type ? or "help" for help, type "exit" to quit ttIsql.
connect "DSN=db_cache;UID=cacheadmin;PWD=oracle;OraclePWD=oracle";
Connection successful: DSN=db_cache;UID=cacheadmin;DataStore=/u01/app/oracle/datastore/db_cache;DatabaseCharacterSet=AL32UTF8;ConnectionCharacterSet=US7ASCII;DRIVER=/u01/app/oracle/product/11.2.1/TimesTen/tt1/lib/libtten.so;PermSize=100;TempSize=32;TypeMode=0;CacheGridEnable=0;OracleNetServiceName=ORCL;
(Default setting AutoCommit=1)
Command> call ttCacheUidPwdSet('cacheadmin','oracle');
Command>
Command> CREATE READONLY CACHE GROUP readcache
       >   AUTOREFRESH INTERVAL
       >   5 SECONDS
       > FROM oratt.readtab (
       >        a NUMBER NOT NULL PRIMARY KEY,
       >        b VARCHAR2(100) );
Command> Additionally dont forget to issue the grants for cacheadmin user in Oracle DB
SQL> GRANT SELECT ON readtab TO cacheadmin;
Grant succeeded.Regards,
Gennady

More than one root table ,how to design cache group ?

hi,
each cache group have onle one root table , many child table ,if my relational model is :
A(id number,name ....,primary key id)
B(id number,.....,primary key id)
A_B_rel (aid number,bid number,foreign key aid referenc a (id),
foreign key bid referenc b(id))
my select statement is "select ... from a,b,a_b_rel where ...."，
i want to cache these three table , how should i create cache group ?
my design is three awt , Cache group A for A , Cache Group b for b, Cache group ab to a_b_rel ?
are there other better solution ?

As you have discovered, you cannot put all three of these tables into one cache group. For READONLY cache groups the solution is simple, put two of the tables (say A and A_B) in one cache group and the other table (B) in a different cache group and make sure that both use the same AUTOREFRESH interval.
For your case, using AWT cache groups, the situation is a bit mnore complicated. You must cache the tables as two different cache groups as mentioned above, but you cannot define a foreign key relationship in TimesTen between tables in different cache groups. Hence you will need to add logic to your application to check and enforce the 'missing' foreignb key relationship (B + A_B in this example) to ensure that you do not inadvertently insert data that would violate the FK relationship defined in Oracle. Otherwise you could insert invalid data in TimesTen and this would then fail to propagate to Oracle.
Chris

About cache group

一个程序向TimesTen的数据表中插入数据能正常运行。但这个表和ORACLE做Cache Group时就不行。
I have a wired problem: a program can insers data into a table of TimesTen when there is no Cache Group with oracle.
However, it can not do this while it is connected to oracle using cache group. Any idea why this happens?
error message:
*** ERROR in tt_main.c, line 90:
*** [TimesTen][TimesTen 7.0.3.0.0 ODBC Driver][TimesTen]TT5102: Cannot load backend library 'libclntsh.so' for Cache Connect.
OS error message 'ld.so.1: test_C: ???: libclntsh.so: ????: ???????'. -- file "bdbOciFuncs.c", lineno 257,
procedure "loadSharedLibrary()"
*** ODBC Error/Warning = S1000, Additional Error/Warning = 5102

I think I can exculde the above possibilities, as I have checked all the settings above.
We could use SQL statements as input, and inserting and query can be done at both ends.
It is only the program that does not work. My "connection string" is the following:
connstr=====DSN=UTEL7;UID=utel7;PWD=utel7;AutoCreate=0;OverWrite=0;Authenticate=1
Maybe it is a mistaken properity, or permission, or a switch parameter? Please give some suggestions.
Thank you very much.
Create cache group command is:
Create Asynchronous Writethrough Cache Group utel7_load
From
utel7.load(col0 binary_float, col1 binary_float ......
My odbc.ini is the following:
# Copyright (C) 1999, 2007, Oracle. All rights reserved.
# The following are the default values for connection attributes.
# In the Data Sources defined below, if the attribute is not explicitly
# set in its entry, TimesTen 7.0 uses the defaults as
# specified below. For more information on these connection attributes,
# see the accompanying documentation.
# Lines in this file beginning with # or ; are treated as comments.
# In attribute=_value_ lines, the value consists of everything
# after the = to the end of the line, with leading and trailing white
# space removed.
# Authenticate=1 (client/server only)
# AutoCreate=1
# CkptFrequency (if Logging == 1 then 600 else 0)
# CkptLogVolume=0
# CkptRate=0 (0 = rate not limited)
# ConnectionCharacterSet (if DatabaseCharacterSet == TIMESTEN8
# then TIMESTEN8 else US7ASCII)
# ConnectionName (process argv[0])
# Connections=64
# DatabaseCharacterSet (no default)
# Diagnostics=1
# DurableCommits=0
# ForceConnect=0
# GroupRestrict (none by default)
# Isolation=1 (1 = read-committed)
# LockLevel=0 (0 = row-level locking)
# LockWait=10 (seconds)
# Logging=1 (1 = write log to disk)
# LogAutoTruncate=1
# LogBuffSize=65536 (measured in KB)
# LogDir (same as checkpoint directory by default)
# LogFileSize=64 (measured in MB)
# LogFlushMethod=0
# LogPurge=1
# MatchLogOpts=0
# MemoryLock=0 (HP-UX, Linux, and Solaris platforms only)
# NLS_LENGTH_SEMANTICS=BYTE
# NLS_NCHAR_CONV_EXCP=0
# NLS_SORT=BINARY
# OverWrite=0
# PermSize=2 (measured in MB; default is 2 on 32-bit, 4 on 64-bit)
# PermWarnThreshold=90
# Preallocate=0
# PrivateCommands=0
# PWD (no default)
# PWDCrypt (no default)
# RecoveryThreads=1
# SQLQueryTimeout=0 (seconds)
# Temporary=0 (data store is permanent by default)
# TempSize (measured in MB; default is derived from PermSize,
# but is always at least 6MB)
# TempWarnThreshold=90
# TypeMode=0 (0 = Oracle types)
# UID (operating system user ID)
# WaitForConnect=1
# Oracle Loading Attributes
# OracleID (no default)
# OraclePWD (no default)
# PassThrough=0 (0 = SQL not passed through to Oracle)
# RACCallback=1
# TransparentLoad=0 (0 = do not load data)
# Client Connection Attributes
# ConnectionCharacterSet (if DatabaseCharacterSet == TIMESTEN8
# then TIMESTEN8 else US7ASCII)
# ConnectionName (process argv[0])
# PWD (no default)
# PWDCrypt (no default)
# TTC_Server (no default)
# TTC_Server_DSN (no default)
# TTC_Timeout=60
# UID (operating system user ID)
[ODBC Data Sources]
TT_tt70=TimesTen 7.0 Driver
TpcbData_tt70=TimesTen 7.0 Driver
TptbmDataRepSrc_tt70=TimesTen 7.0 Driver
TptbmDataRepDst_tt70=TimesTen 7.0 Driver
TptbmData_tt70=TimesTen 7.0 Driver
BulkInsData_tt70=TimesTen 7.0 Driver
WiscData_tt70=TimesTen 7.0 Driver
RunData_tt70=TimesTen 7.0 Driver
CacheData_tt70=TimesTen 7.0 Driver
Utel7=TimesTen 7.0 Driver
TpcbDataCS_tt70=TimesTen 7.0 Client Driver
TptbmDataCS_tt70=TimesTen 7.0 Client Driver
BulkInsDataCS_tt70=TimesTen 7.0 Client Driver
WiscDataCS_tt70=TimesTen 7.0 Client Driver
RunDataCS_tt70=TimesTen 7.0 Client Driver
# Instance-Specific System Data Store
# A predefined instance-specific data store reserved for system use.
# It provides a well-known data store for use when a connection
# is required to execute commands.
[TT_tt70]
Driver=/oracle/timesten/TimesTen/tt70/lib/libtten.so
DataStore=/oracle/timesten/TimesTen/tt70/info/TT_tt70
DatabaseCharacterSet=US7ASCII
# Data source for TPCB
# This data store is created on connect; if it doesn't already exist.
# (AutoCreate=1 and Overwrite=0). For performance reasons, database-
# level locking is used. However, logging is turned on. The initial
# size is set to 16MB.
[TpcbData_tt70]
Driver=/oracle/timesten/TimesTen/tt70/lib/libtten.so
DataStore=/oracle/timesten/TimesTen/tt70/info/DemoDataStore/TpcbData
DatabaseCharacterSet=US7ASCII
PermSize=16
WaitForConnect=0
Authenticate=0
# Data source for TPTBM demo
# This data store is created everytime the benchmark is run.
# Overwrite should always be 0 for this benchmark. All other
# attributes may be varied and performance under those conditions
# evaluated. The initial size is set to 20MB and durable commits are
# turned off.
[TptbmData_tt70]
Driver=/oracle/timesten/TimesTen/tt70/lib/libtten.so
DataStore=/oracle/timesten/TimesTen/tt70/info/DemoDataStore/TptbmData
DatabaseCharacterSet=US7ASCII
PermSize=20
Overwrite=0
Authenticate=0
# Source data source for TPTBM demo in replication mode
# This data store is created everytime the replication benchmark demo
# is run. This datastore is set up for the source data store.
[TptbmDataRepSrc_tt70]
Driver=/oracle/timesten/TimesTen/tt70/lib/libtten.so
DataStore=/oracle/timesten/TimesTen/tt70/info/DemoDataStore/TptbmDataRepSrc_tt70
DatabaseCharacterSet=US7ASCII
PermSize=20
Overwrite=0
Authenticate=0
# Destination data source for TPTBM demo in replication mode
# This data store is created everytime the replication benchmark demo
# is run. This datastore is set up for the destination data store.
[TptbmDataRepDst_tt70]
Driver=/oracle/timesten/TimesTen/tt70/lib/libtten.so
DataStore=/oracle/timesten/TimesTen/tt70/info/DemoDataStore/TptbmDataRepDst_tt70
DatabaseCharacterSet=US7ASCII
PermSize=20
Overwrite=0
Authenticate=0
# Data source for BULKINSERT demo
# This data store is created on connect; if it doesn't already exist
# (AutoCreate=1 and Overwrite=0).
[BulkInsData_tt70]
Driver=/oracle/timesten/TimesTen/tt70/lib/libtten.so
DataStore=/oracle/timesten/TimesTen/tt70/info/DemoDataStore/BulkInsData
DatabaseCharacterSet=US7ASCII
LockLevel=1
PermSize=32
WaitForConnect=0
Authenticate=0
# Data source for WISCBM demo
# This data store is created on connect if it doesn't already exist
# (AutoCreate=1 and Overwrite=0). For performance reasons,
# database-level locking is used. However, logging is turned on.
[WiscData_tt70]
Driver=/oracle/timesten/TimesTen/tt70/lib/libtten.so
DataStore=/oracle/timesten/TimesTen/tt70/info/DemoDataStore/WiscData
DatabaseCharacterSet=US7ASCII
LockLevel=1
PermSize=16
WaitForConnect=0
Authenticate=0
# Default Data source for TTISQL demo and utility
# Use default options.
[RunData_tt70]
Driver=/oracle/timesten/TimesTen/tt70/lib/libtten.so
DataStore=/oracle/timesten/TimesTen/tt70/info/DemoDataStore/RunData
DatabaseCharacterSet=US7ASCII
Authenticate=0
# Sample Data source for the xlaSimple demo
# see manual for discussion of this demo
[Sample_tt70]
Driver=/oracle/timesten/TimesTen/tt70/lib/libtten.so
DataStore=/oracle/timesten/TimesTen/tt70/info/DemoDataStore/Sample
DatabaseCharacterSet=US7ASCII
TempSize=16
PermSize=16
Authenticate=0
# Sample data source using OracleId.
[CacheData_tt70]
Driver=/oracle/timesten/TimesTen/tt70/lib/libtten.so
DataStore=/oracle/timesten/TimesTen/tt70/info/DemoDataStore/CacheData
DatabaseCharacterSet=US7ASCII
OracleId=MyData
PermSize=16
# New data source definitions can be added below. Here is my datastore!!!
[Utel7]
Driver=/oracle/timesten/TimesTen/tt70/lib/libtten.so
DataStore=/oracle/timesten/TimesTen/tt70/tt70_data/utel7
DatabaseCharacterSet=ZHS16GBK
Uid=utel7
Authenticate=0
OracleID=db3
OraclePWD=utel7
PermSize=6000
Connections=20
#permsize*20%
TempSize=400
CkptFrequency=600
CkptLogVolume=256
LogBuffSize=256000
LogFileSize=256

Use of GROUP BY in SELECT

I am considering using GROUP BY in several selects where I will access very big bsik, bsid, bsad, bsak, ecc...
My two concerns are performance and high data volume.
GROUP BY should reduce data arriving from DB but will it hurt performance?
What are your considerations?
Any ideas are welcome. I cannot seem to find anything specific for or against GROUP BY.
thanks,
Phillip

Hello Philip,
I would advise that you do not use the Group By clause in the select statements for these tables. As you have rightly said, the data volume in these tables might be a major cause for concern.
Using the Group By clause will heavily load the database server. while in the development environment, your query might run okay, in the productive environment it might crash. The reason : the cursor to the database would have timed out.
The Group By operation, as you know can be simulated after you get the data into the application server. The application server processing can take some time but you can usually optimize it.
Regards,
Anand Mandalika.

Question About what Azure Services I should be using for mobile app with website.

Hello,
I am wondering what Azure service would be best for my new application. I need to have an SQL database that I can connect to and modify from both a website and a mobile app preferably WP8 and Android. I was not really understanding whether I would need a
mobile service or normal SQL database. Which should I use or am I completely off track?
Thanks,
Matthias

Mobile Services uses SQL Database, nothing special on that SQL Database, its just like any other "normal" SQL Database.
Mobile Services provides "back-end services" that simplifies accessing SQL Database, Notification services, authentication, etc...
Let's assume you don't use Mobile Services, to use SQL Database, you would need your app (both mobile and web) to connect to the database. In practice, you will not want to expose your SQL database directly, so you'd end-up writing some kind of a "facade"
that your app will access instead of directly connecting to the database.
Instead of writing that "facade", Mobile services provides that for you (you still have to write code though, but less than what you need to write if you're rolling your own).
Both your web app and mobile apps can share the same SQL database (pay attention to the mobile service schema).
To help you decide, ask yourself what other features will your mobile app require? Authentication? Notification? etc... are you prepared to write those on your own or use various libraries instead of one?

Which wattage adapter should I use with the composite cable with my iPad?

Which wattage adapter should I use with the composite cable when connected to my iPad while watching T. V. .

Ultimately, use the power adapter that came with the iPad. But you should use any USB based power adapter that has a 10 watt/ 2 amp or higher power rating. Look close when buying a thrid party adapter, if it does not specify 10 watts/2 amps it is a lower 5 watt/1 amp charger that will not work.

Direct Connectivity to systems source

Please i have a question:
Should the OWB Client (Design component) have direct connection to the system sources, to import metadata, or the import will be executed from server_Repository(design), in this case only the server_side must be connected to the source.
(I read the paper Oracle warehouse Builder 10g Architecture, it discusses about metabase : is this component resides in server or in server(design) ???
Thanks for your help

Hi,
If you have checked the architecture of OWB you've seen the following 3 'environments':
- design time repository (holds model information);
- runtime repository (holds runtime information on deployment and execution);
- target schema (your actual datawarehouse).
The OWB Client interacts with the design time repository.
From within the OWB Client you can start the Deployment Manager (using the so-called Runtime Access User), all things happening here are stored in the runtime repository.
With your OWB Client you need access to the design repository, thus access to the database where this resides (since you have to specifically log in).
From this design repository database you need access to all databases that are used as source for your datawarehouse (via databaselinks).
Hope this helped.
Regards, Patrick

Webservice Vs Direct Connect to DB

Experts,
In our application, we're connecting to legacy application using web service call. Here, I wanted to know the benefit of using Web Service call or direct connect to DB using Open SQL.
Please advice which one is best. Here I was not able to come to any conculsion.
Regards,
Ramki.

Hi,
>Here I was not able to come to any conculsion.
Maybe you could think of what will happen if there is a structure change in a table ? This might help you to come to a conclusion...
Direct external access to a database is EVIL and should be avoided at any price.
By the way, if you access SAP data directly at database level, you loose SAP support...
Regards,
Olivier

Connect to APEX database using VBA+ADO code in Microsoft Excel & Word?

I am looking at APEX as a potential replacement for a growing reporting/analysis system. As yet I have not found a clear answer on an important question.
The current system is a shared database and a collection of Microsoft Excel and Word templates. Each template contains underlying VBA code that establishes a direct connection to the database via OLE DB (i.e. ADODB objects in VBA via the OLE DB Provider for JET).
Each template’s underlying VBA code executes stored procedures or queries as required, the results of which are returned as Recordset objects and rendered to the Excel worksheet or Word document. Similarly, in some cases, data entered into an Excel worksheet by a user can be submitted back to the database at the click of a button, again via Recordset objects.
Now most of our templates could easily be ported to APEX. However, there is a strong preference that some of our templates continue to exist and maintain current functionality. So we have a requirement that Excel and Word can seamlessly and directly interact with an APEX database.
Long question short – is there a way to establish a connection and retrieve/insert data from an APEX database using OLE DB (ADODB) in VBA, as described above? I understand that APEX sits ‘on top’ of a real Oracle database, and I know Oracle provides an OLE DB Provider (OraOLEDB) for Oracle databases. Would OraOLEDB do the trick, or is it not as simple as that?
Many thanks for your insights on this,
Michal

The current system is a shared database and a collection of Microsoft Excel and Word templates. Each template contains underlying VBA code that establishes a direct connection to the database via OLE DB (i.e. ADODB objects in VBA via the OLE DB Provider for JET).
Long question short – is there a way to establish a connection and retrieve/insert data from an APEX database using OLE DB (ADODB) in VBA, as described above? I understand that APEX sits ‘on top’ of a real Oracle database, and I know Oracle provides an OLE DB Provider (OraOLEDB) for Oracle databases. Would OraOLEDB do the trick, or is it not as simple as that?Hi,
Apex gets installed as a separate schema in an existing database.
So it will not in any way interfere with your existing setup. You can continue to connect directly to the database from your spreadsheets, call stored procedures from VBA/ADO, etc.
- Morten
http://ora-00001.blogspot.com

Use 2 App modules with connection to 2 databases on 1 UIX page?

Is it possible use 2 different Application modules with connection to different databases on one UIX page?
Thank you.

Yes.
Use a <bc4j:registryDef> with two <bc4j:rootAppModule>'s inside. Everything else is the same as the single root application module case.
More documentation is available in the UIX Developer's Guide available in the JDeveloper help system and online at:
http://helponline.oracle.com/uix/help/
Kind Regards.

Should i use cache group or a direct connection to oralce database?

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