Readonly database and v$ views

I would like to know when a database is open in read only mode, is all v$ views are updated to know performance about it ?
example : v$session, v$sysstat... for ratio.

Hi,
When you open an Oracle database in READ ONLY mode, then it is READ ONLY for the database users, not for Oracle. Oracle has to write to the dictionary continously. In fact the temp tablespace is also used and written to in a READ ONLY database.
Regards.

Similar Messages

PDF stored in database and to view the PDF when clicking on a link

Is it possible to save a PDF document in the database as a blob column and to retrieve the PDF when clicking on the link
Example
Above method is possible for images
See: http://www.oracle.com/technology/obe/apex/apex31nf/apex31blob.htm.
But can I reach the same for PDF documents?
Thanks in advance for your response.
Kind regards,
Iloon

Hello Andy,
This Upload and Download Files is very useful feature in APEX.
However, is there a way of displaying PDF files first in the report by clicking the corresponding link
in the table?
I mean, is it possible to view PDF files first by clicking the link before deciding to download them?
As we see, this approach is used by most websites and after opening and viewing a PDF file, we can save them.
Thanks.
Shurick.
Edited by: Shurick on Sep 28, 2009 12:51 PM

Offline database and table, view, package organization

Hi,
I tried to import my database schema with package, synonyms, tables, and views into a jdev project (11.1.1.1.0) and noticed that unlike the online db view, all object types are imported/organized under one folder (the name of the schema).
For example, online db view shows the following structure
+ my_schema
+ Tables
+ MyTable1
+ Views
+ MyView1
+ Indexes
+ MyIndex1
+ Packages
+ MyPackage1
+ ....
But the imported offline db view shows the following structure that has all different types of db objects listed under myschema folder
+ my_schema
+ MyTable1
+ MyView1
+ MyIndex1
+ MyPackage1
+ ....
This offline representation is hard to work with and unusable if one wants to create database diagrams for different types of large # of database objects.
Any comments?
Thanks,

Hi,
It doesn't sound like it is the different package that is causing this message. Is SB1 a system in your landscape? Are there any differences between the tables?
The message seems to be suggesting that either the second table, or possibly the function group you are using were imported from another system.
Regards,
Nick

Include or create a view in the database and use this view?

Well, I need to get related data of the main table from another related tables, so one way to do that is to use the Include method in Entity Framework to get this related data.
However, I am thinking in another option, create a view in the database and use this view in entity framework. In this way, I avoid the needed of the include, because I think that is expensive in resources. But I am no very sure about that.
I would like to know if the use of views on entity framework is a good idea to improve the performace or is better to use the include.
For example, if I use the include I have the advantage that I get only one the main record and all the related data I have in the navigation properties, so the info is more shorted.
Which is the advanteges and disadvantages of both methods to get related data in entity framework?
Thank so much.

Hello ComptonAlvaro,
>>I would like to know if the use of views on entity framework is a good idea to improve the performace or is better to use the include.
If your view would use a Join syntax to query master-child relationship tables, it actually is similar with the Include() method which actually results a duplicate records from master table, you could check this
link for detail description.
>>Which is the advanteges and disadvantages of both methods to get related data in entity framework?
One visible difference is that records from Views are not editable by default(if you want edit them, you could refer to this
blog).
In your case, my suggestion that you could use the lazying load which will load the matter table once and disable the trace if you only need to display data.
Regards.
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Database and Views, Flex Mobile

HI !
in flex mobile, every time I do a query, I have to re-open the database for each view? thanks!

I'm guessing you have to reconnect your class because you are instantiating it in each view
the idea is to instantiate and connect the database class and each view use the same instance (which is already connected) so you only want to instantiate the class once
You could do that in the main app and pass it to each view that needs it, but that can get complictaed and tedious for larger apps and not good practise
or use a singleton which acts like a global or static class, the same instance available everywhere
or (the best way) use a framework which instantiates the class for you and you can simply inject it to each view.
there are plenty of guides to AS3 singletons on google
I found this video useful. Its a bit long but might give you some ideas on the way to go
http://tv.adobe.com/watch/max-2010-develop/flexactionscript-30-architecture-and-dependency -injection-frameworks-overview/

Difference among the Help view,Database view and Maintanance View

hi,
can Anyone pls let me know the Difference among the Help view,Database view and Maintanance View
thanks&regards
rama

The followings are different types of views:
Database View (SE11)
Database views are implement an inner join, that is, only records of the primary table (selected via the join operation) for which the corresponding records of the secondary tables also exist are fetched. Inconsistencies between primary and secondary table could, therefore, lead to a reduced selection set.
In database views, the join conditions can be formulated using equality relationships between any base fields. In the other types of view, they must be taken from existing foreign keys. That is, tables can only be collected in a maintenance or help view if they are linked to one another via foreign keys.
Help View ( SE54)
Help views are used to output additional information when the online help system is called.
When the F4 button is pressed for a screen field, a check is first made on whether a matchcode is defined for this field. If this is not the case, the help view is displayed in which the check table of the field is the primary table. Thus, for each table no more than one help view can be created, that is, a table can only be primary table in at most one help view.
Go thru this link plzz
http://help.sap.com/saphelp_nw2004s/helpdata/en/cf/21ecf9446011d189700000e8322d00/frameset.htm
Difference between "Help View" and "Search Help"
Projection View
Projection views are used to suppress or mask certain fields in a table (projection), thus minimizing the number of interfaces. This means that only the data that is actually required is exchanged when the database is accessed.
A projection view can draw upon only one table. Selection conditions cannot be specified for projection views.
Maintenance View ( SE54 )
Maintenance views enable a business-oriented approach to looking at data, while at the same time, making it possible to maintain the data involved. Data from several tables can be summarized in a maintenance view and maintained collectively via this view. That is, the data is entered via the view and then distributed to the underlying tables by the system.
Please have a look at below link. It will help you.
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ed06446011d189700000e8322d00/frameset.htm
for more detailed info look on:
http://www.sap-img.com/abap/what-is-the-different-types-and-usage-of-views.htm
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/home/abap+dictionary&
1.Go to se11
2. select view radiobutton and give a name
3. Create
4. select type of view you want to create. Such as database view.
5. give short description
6. give a table name such as mara
7. press the pushbutton relationship. here you will find all the tables which are allowed to create view with mara.
8. select one or mane tables.
8 copy
9.save , check and activate.
The followings are different types of views:
Database View (SE11)
Database views are implement an inner join, that is, only records of the primary table (selected via the join operation) for which the corresponding records of the secondary tables also exist are fetched. Inconsistencies between primary and secondary table could, therefore, lead to a reduced selection set.
In database views, the join conditions can be formulated using equality relationships between any base fields. In the other types of view, they must be taken from existing foreign keys. That is, tables can only be collected in a maintenance or help view if they are linked to one another via foreign keys.
Help View ( SE54)
Help views are used to output additional information when the online help system is called.
When the F4 button is pressed for a screen field, a check is first made on whether a matchcode is defined for this field. If this is not the case, the help view is displayed in which the check table of the field is the primary table. Thus, for each table no more than one help view can be created, that is, a table can only be primary table in at most one help view.
Go thru this link plzz
http://help.sap.com/saphelp_nw2004s/helpdata/en/cf/21ecf9446011d189700000e8322d00/frameset.htm
Difference between "Help View" and "Search Help"
Projection View
Projection views are used to suppress or mask certain fields in a table (projection), thus minimizing the number of interfaces. This means that only the data that is actually required is exchanged when the database is accessed.
A projection view can draw upon only one table. Selection conditions cannot be specified for projection views.
Maintenance View ( SE54 )
Maintenance views enable a business-oriented approach to looking at data, while at the same time, making it possible to maintain the data involved. Data from several tables can be summarized in a maintenance view and maintained collectively via this view. That is, the data is entered via the view and then distributed to the underlying tables by the system.
Please have a look at below link. It will help you.
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ed06446011d189700000e8322d00/frameset.htm
for more detailed info look on:
http://www.sap-img.com/abap/what-is-the-different-types-and-usage-of-views.htm
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/home/abap+dictionary&
Go thru this link plzz
http://help.sap.com/saphelp_nw2004s/helpdata/en/cf/21ecf9446011d189700000e8322d00/frameset.htm
Difference between "Help View" and "Search Help"
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ed06446011d189700000e8322d00/frameset.htm
Hope this is helpful, Do reward

What is the use of Database View, maintenace , projection and Help view

hello friends,
I created tables..and set check table relation.
how to create Database View, maintenace , projection and Help view
phani

Hi,
have a look at this.
4 type of views
database
maintainance
help
projection view
check this link as well
(https://forums.sdn.sap.com/click.jspa?searchID=9904886&messageID=4885135)
Database views are implemented with an equivalent view on the database.
Projection views are used to hide fields of a table (only projection).
Database views should be created if want to select logically connected data from different tables simultaneously.
Database views implement an inner join.
Application programs can access the data of a database view using the database interface. (Just as we write select queries on database tables, we can write them for views as well.)
Includes in Database Views
An entire table can be included in a database view. In this case all the fields of the included table will become fields of the view (whereby you can explicitly exclude certain fields).
To include one of the tables in the view, enter character * in field View field, the name of the table to be included in field Table and character * again in field Field name on the View fields tab page of the maintenance screen of the view.
You can also exclude individual fields of an included table. If you do not want to include a field of the included table in the view, enter - in field View field, the name of the included table in field Table and the name of the field to be excluded in field Field name.
Inserts with Database Views
If a database view contains only one single table, data can be inserted in this table with the view .
You have the following options for the contents of the table fields not contained in the view:
If the field is defined on the database with NOT NULL as initial value, the field is filled with the corresponding initial value.
If the field is defined on the database as NOT NULL without initial value, an insert is not possible. This results in a database error.
If the field is not defined on the database as NOT NULL, there will be a NULL value in this field.
A maintenance view permits you to maintain the data of an application object together.
The maintenance status determines which accesses to the data of the underlying tables are possible with the maintenance view.
Read only: Data can only be read through the view.
Read, change, delete, insert: Data of the tables contained in the view can be
changed, deleted, and inserted through the view.
Read and change: Existing view entries can be changed. However, records
cannot be deleted or inserted.
Read and change (time-dependent views): Only entries whose non-time
dependent part of the key is the same as that of existing entries may be
inserted.
Maintenance View ( SE54 )
You can use a maintenance view to maintain data, which is distributed over several tables, at the same time.
Maintenance views enable a business-oriented approach to looking at data, while at the same time, making it possible to maintain the data involved. Data from several tables can be summarized in a maintenance view and maintained collectively via this view. That is, the data is entered via the view and then distributed to the underlying tables by the system.
Creating maintenance View:
http://help.sap.com/saphelp_nw2004s/helpdata/en/cf/21ecdf446011d189700000e8322d00/frameset.htm
regards,
vipul

Problem in retreiving from database and viewing it in browser--urgent

hai,
i have develped an application using swings where the mails received from client and reply posted will be pasted in JEditorPane. all the mails,query and reply will be stored in database.
then iam retrieving the mails from database and displaying it in browser using table data.(Just like forum). Iam using encodehtmltag function to omit the html tags that r present in the mail data.
when i display it in browser it extends a page horizontically. how to avoid this. how to word wrap. one of my friend asked me to set number of character to be displayed per line. i did that. but problem is i could see the word break . i have set 90 characters to be displayed per line. i dont want to break the word. for eg., if the end string of a line is regarding it is displayed like this---reg and then arding in next line. how to avoid this.
please help me iam breaking my head with this for past few days.

If the field is a Date in your database, you can use the ResultSet.getDate() method, which will return a java.sql.Date (which extends java.util.Date).
You can then use SimpleDateFormat to format it the way you like.
See the API doc for more details.

Search for a record from Access Database, and populate records in Drop Down List, and View It

Hi,
I created a PDF form where I have open, next, previous buttons, and I'm able to connect to the access database, and it's working fine. Now, I want to be able to search by last name from the access database, and retrieve the results in a dropdown field, and then once i select the records in the drop downlist, i want to press a button to display the record. I have multiple records with the same last name. Please help, I searched the internet for hours, and can't find something similar. Your help is appreciated, and sample code is appreciated.

<%
int count = 0;
while (rs1.next()){ %>
<%if (count ==0)
{%>
<option value="<%=inputorthodon%>" selected >
<%=rs1.getString("ortho_name")%></option>
<%}
else{%>
<option value="<%=inputorthodon%>">
<%=rs1.getString("ortho_name")%></option>
<%}
++count;} %>
</select>
U may have to format this a bit. The idea is to use a count variable to put "selected" in only the first OPTION. After that, we don't have to.
Hope this helps.

Reference to database and/or server name in '' is not supported in this version of SQL Server

Hello all
I am using C# and ADO.NET (native) - Visual Studio 2013.
I am always using full qualified queries like "SELECT * FROM [database].[schema].[table]"
Obviously there is a problem when doing this against SQL Azure,
I get the following error: "Reference to database and/or server name in '' is not supported in this version of SQL Server"
Interesting fact: With SQL Management Studio, the same query works.
I need to know if this error is really a true one or not.
If yes, I can quit using SQL Azure. I would need a SQL Server and not a partial SQL Server :-)
Thanks and best regards
Frank

Hi,
Here are my suggestions:
1. Use partially qualified queries, because:
a. from a security standpoint, you'd want to limit your login's access across the server instance
b. in order to achieve a even better, you should specify your database as the Initial Catalog directly in the SQL Connection.
If you take into account these practices, SQL Database doesn't come with any limitation from that point of view.
However, in regard to 'With SQL Management Studio, the same query works', this is actually only partially true because if you run that query agains ADO.NET, you'll actually end up in switching databases along the query which is obviously not permitted in
SQL Database since you're running in a hosted black-box version of SQL you're not managing. It's just like running the USE <dbname> command which obviously doesn't work.
Alex

How to get the List of Database Objects (Table/View) for a given APEX Page.

Hi,
I have an application and that consist of pages like page1,2,3,.....
*1.* I want a report which can give me the list of all the Pages1,2,3,....
I am using the following query to acheive this.... THIS IS FINE..
select a.workspace, a.owner, a.application_name, b.page_id, b.page_name
from apex_applications a,
apex_application_pages b
where a.workspace = b.workspace
and a.application_id = b.application_id*2. Now, I want for each individual page*, the list all the database objects (tables/views), which that page is using.
I am using ALL_DEPENDENCIES , but I am not getting the result.
So, want to know if there any view/table, where I can get the Application Pages & there database object list...
Thanks,
Deepak

Hari,
Thanks for the response.
The view APEX_APPLICATION_PAGE_DB_ITEMS will only give me the table name related to any Page Items defined to that page..It will not give me all the database objects..
suppose we have a Page, having a report based on multiple tables and there is no Page items defined on that page, we will not have any value in this ....DB_ITEMS table. same thing if we have define some PL|SQL(using some table/view) in a Process, that will not be populated in .....DB_ITEMS table. I want some thing like all the database objects (table/views/function/procedure/.....) for a particular Page ID.
Thanks,
Deepak

Database and Server Report

Hi,
I want to assist my friend (he is same like me, newbie in oracle) to give a report on health of oracle database and server; which is running in his small software development and data feeding company. There are around
1. 50 users,
2. windows XP professional,
3. Oracle9i Enterprise Edition Release 9.2.0.1.0 – Production,
4. one database, No Archive Mode, oracle home is : c:\oracle\ora92 and database is stored at D:\ORACLE\oradata\orcl, 3 control files, 3 redo groups and 11 dbfs
5. 2.27 GB is free space on the drive of oracle home,
6. more than 1 GB RAM is in the system,
7. <what else more; I should describe, please let me know>
He has to submit a report on current status, health, performance etc. of oracle database and server. How should we design and get the data, please guide me.
Thanks & Regards

You Mean Helath Check Report of the DB
Tablespace size?
Datafile Size?
Default tablespace?
UNDO management?
SGA?
buffer cache hit ratio?
library cache hit ratio?
There are so many other parameters..Performance cannot be predicted from remote site
But you can provide certain information
Here are some views which could be helpful
DBA_TABLESPACE
DBA_FREE_SPACE
DBA_DATA_FILES
V$CONTROLFILE
V$LOG--Meaning less since you run in archived mode
Number of Oracle Process allocated
UNDO RETENTION
SQL>show parameter process
SQL>show parameter UNDO
Do you have METALINK acces
1019546.6
this has everything then you can pass whatever they need
and many more

I have a database of names. When I go to the database and pull up names I right click on the option "Open in new tab". I would like to bring up 200 names and do the same function simultaaneously to them like, add a vote to their total individual vote co

I have a database of names. When I go to the database and pull up names I right click on the option "Open in new tab". I would like to bring up 200 names and do the same function simultaaneously to them like, add a vote to their total individual vote count. Is this possible?

I ended up reformating the drive as FAT32 because I still need to use it on my Windows 98SE system also. I did have a problem with the allocation size. I wanted to use 512 bytes but it kept failing so I used the default size(8192 bytes) and then it worked fine. I didn't think there would be a problem formatting as NTFS but since you are having problems I just tried it. It failed at 512 bytes allocation size so I tried again using 4096 bytes, the default, as the allocation size and it failed again. It looks like these drives will not format as NTFS.
Also, I think I figured out what's going on with the ReadyBoost problem. As I said initially it wouldn't work with ReadyBoost then after I had 12GB of data on the drive the ReadyBoost feature started working. After I deleted all the files it quit working again. After doing some reading on the net about Flash drives and ReadyBoost problems it appears that the memory chips on my Lenovo Flash drive are mixed with both fast memory chips that work fine with ReadyBoost and slower memory chips that are too slow for ReadyBoost. Apparently, after I fill up the portion of memory with data that uses the slow chip(s) then ReadyBoost works fine with the fast chip(s). I also verified the Flash drives read and write memory speeds using Vista's Event Viewer. To work with ReadyBoost the Flash drive has to read at a minimum of 2.5MB/s (for 4KB random reads) and write at a minimum of 1.75MB/s (for 512KB random writes).
Let me know what you find out.

How to retrieve data using logical database and custom select options

Hi all,
I have a selection screen which is displayed by logical database PSJ and I have two select options of my own. I need to retrieve data based on both selection screen of logical database and my own select options. How can I do it?
Thanks in advance.

Hai Gupta
Check the following Document & Links
1. A logical database is in fact
a program only.
2. This LDB provides two main things :
a) a pre-defined selection screen
which handles all user inputs and validations
b) pre defined set of data
based upon the user selection.
3. So we dont have to worry about from
which tables to fetch data.
4. Moreover, this LDB Program,
handles all user-authorisations
and is efficient in all respects.
5. tcode is SLDB
good info about Logical Database. you can check the link.
http://www.geekinterview.com/question_details/1506
http://help.sap.com/saphelp_46c/helpdata/EN/35/2cd77bd7705394e10000009b387c12/frameset.htm
Re: How to Create and Use ldb in reports?
Re: Logical databases
http://help.sap.com/saphelp_46c/helpdata/en/9f/db9bed35c111d1829f0000e829fbfe/frameset.htm
Functions for displaying and changing logical databases:
Call Transaction SE36 or
Choose ABAP Workbench -> Development -> Programming environ. -> Logical databases
Interaction between database program and report:
During program processing, subroutines are performed in the database program and events are executed in the report.
To read data from a database tables we use logical database.
A logical database provides read-only access to a group of related tables to an ABAP/4 program.
advantages:-
The programmer need not worry about the primary key for each table.Because Logical database knows how the different tables relate to each other,and can issue the SELECT command with proper where clause to retrieve the data.
i)An easy-to-use standard user interface.
ii)check functions which check that user input is complete,correct,and plausible.
iii)meaningful data selection.
iv)central authorization checks for database accesses.
v)good read access performance while retaining the hierarchical data view determined by the application logic.
disadvantages:-
i)If you donot specify a logical database in the program attributes,the GET events never occur.
ii)There is no ENDGET command,so the code block associated with an event ends with the next event
statement (such as another GET or an END-OF-SELECTION).
1. transaction code SLDB.
2.enter name z<ldb-name>
3.create
4.short text
5.create
6. name of root node (here Ekko)
7. enter short text (f6)
8.node type -> data base table.
9.create
10 change logical DB
riht click on ekko and insert node
here node name ekpo
11.create
12. click on selections
13. press no Should the changed structure of Z<ldb name> be saved first.
14.select tables which you want to join.
15.transfer
16 now you have to o to coding part.
17. save
activate.
19.click to src code
double click on first include and activate
Regards
Sreeni

Saving data in a database and publishing data to multiple clients

Hi there. I'm using a bunch of Compact FieldPoint modules to read out a few hundred voltages, temperatures, currents, etc. I acquire this data at about 1 Hz (pretty slow). I would like to record this data to some sort of database on a cpu (running LV 8.0, connected to the FieldPoint mods), and serve the data to multiple (between 10 and 50) clients over the net, each running a compiled stand-alone "data grabber and viewer" application (which I'll have to write of course). I'd like these external clients to basically be able to pick a certain variable from the database, and plot it for the last week (or something like that). Presumably the standalone client would send some database query to the server. The server would then send the data to the client, and the standalone client would receive the data and plot it as the user sees fit. My question is how to implement this database? Should I use the LabView "Database" Add-On to create a database to store the data? Is it better to just store the data as binary and write my own data fetching routine to handle queries? How can I write this database to disk for permanent storage? Could this database be accessible outside of LabView?
Any help on this would be appreciated. Thanks!
Jesse Wodin
Post Doctoral Researcher
Stanford Linear Accelerator Center
650-504-2512

Hi Jesse,
The Citadel database is not a relational database. It's highly optimized for storing lower-rate (non-waveform) channel-by-channel, or "trace" measurement data. Another option you can consider is using DSC and Citadel on the server then writing a utility to export the data from Citdael to an SQL database. --That would solve the problem of having to write a logger application from scratch. You would only have to write the relatively simple application to export the data from Citadel and import it into a relational database.
You could accomplish this two ways. First, DSC includes a set of VIs that will retrieve historical data from Ciatdel. You could use LabVIEW to parse this data and write it to a table in a relational database. Second, Citadel actually includes a locally accessible ODBC interface. (You can query Citadel using an SQL query from the local computer). You could query Citadel using this interface, then write the result to a table in a relational database.
To view Citadel in its native format or query a Citadel database using ODBC from a remote comptuer that comptuer would need to have a licensed DSC RTS installed.
~~

Readonly database and v$ views

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