PL/SQL :: Single Long Connection Vs Multiple Short Connections To Oracle Server
Oct 8, 2012
A DB server (Oracle 11g) on Linux will support a Web Application Server (Java based) for hosting a public web site.For sending multiple INSERT statements over from the Java Server to Oracle Server, I have two ways to do it:
1) Wrap those insert statements together and send it over with one connection to Oracle
2) Send each insert statement separately to Oracle. As the result, multiple insert statements are sent and accordingly multiple connections to Oracle are needed.
Advantage of option 1 is just using one Connection. Disadvantages are that Oracle will then need to parse the statement string into multiple separate insert statements, and then loop through them to execute each. This may be costly in CPU sense.
While the option 2 may have quicker execute of each insert statement, but will need to create multiple connections.If the number of users is known and stable (such as intranet), I would prefer option 1; while for the internet there could hundreds concurrent users at the peak, I lean towards the option 2.
I have a quite complex view that selects from approx 10 long tables (approx 4M records each) and build one "customer sentence" pre customer id. I will be always getting just one row from this view, eg. select * from my_view where party_id = XYZ. I'll NEVER EVER select the whole view.
The problem is that running a query: select * from my_view where party_id = XYZ takes really long time, while putting the party_id = XYZ condition directly into the view executes in 0.0 seconds.
After putting a ORDERED FIRST_ROWS(1) hint into a view the execution plans seems to be the same (or very similar) for both queries. Unfortunately, I can not transfer anything but screenshot from the environmnet - therefore I paste the exec plans as screenshots only - pls follow the link: [URL]...
View DDL: create or replace view my_view as select /*+ ORDERED FIRST_ROWS(1) */ pt.party_id pt.party_id as id_klienta_mdm, pt.master_reference_no as id_klienta_ref_mdm,
We have a Data Source with min_pool_size (10) and max_pool_size (20). A Data Source is by default a connection pool. By starting a transaction we are retrieving a connection from the pool (i.e., opening it to retrieve data, perform queries, inserts and updates). Our application server is JBoss. An application workflow uses many transactions to build a product. The same connection is not used by the application for the entire workflow; but, it uses and returns them to the connection pool. We do not use Java syntax like "rs.close():"... this is performed by iBATIS.
On the Linux side when we execute a "ps" command (ps -elf|grep -i ora) we see all the Oracle processes. A further refinement of that command (ps -elf|grep -i local=no)shows a list of the "waiting" connections in the connection pool. The DB may be queried with the following syntax:
SELECT schemaname, sid, serial# FROM gv$session where schemaname = 'APP_USER' order by SID;
A list of connected sid and serial numbers is returned, identifying which connections are in use. From here we are able to force the connection to trace by executing the following:
exec dbms_monitor.session_trace_enable(249, 6595, TRUE, FALSE); ! 249 and 6595 being SID and Serial# from query above
There should be no need to execute the inverse, since the connection is returned to the pool when the transaction is committed or rolled back.
We are trying to trace in order to use the Quest Benchmark Factory. Their instructions request the following syntax be applied to each session:
alter session set events '10046 trace name context forever, level 4';
and again, the inverse should not be necessary.
alter session set events '10046 trace name context off'
When it became too cumbersome to alter each session as it appeared, we issued an "alter system" to monitor (trace) everything. The trace files filled the disk, and four hours of testing was stopped two hours in. Doing a system level trace is probably not a good idea.
My first inclination was to create a post-logon trigger to set trace in the session; however, these connections, coming from an JBoss connection pool, do not logon each time, and I presume that they are not all the "same session".
We opened a support ticket with Quest last Friday and do not have an answer yet. This was the third ticket with them, the first to get Benchmark Factory installed (the original installer did not work). The second ticket was to setting up a shared directory on Linux with a folder on Windows, a setup configuration required by their tool. The third ticket to address this issue.
They needed to contact "the developers" to answer the last two questions. Their latest suggestion is to fix ticket two so we "won't need to trace" anything. How do I set trace in these connections?
I have database in single server. I already have ORACLE_SID=stagedb. So i want to create new sid and named as proddb.Is it possible have multiple db in single server? This server not running as RAC. It run as single only.
I work in a large bank in a department that produces reports for different areas of the bank. By and large, we use Microsoft Office products to interface with our Oracle databases.Recently, we had two new databases come online that use Oracle 11g - we were not using any 11g databases before this point. We have two other databases that we use that run on Oracle 10g.
Up until the two new databases were brought in, our reporting was done from systems that used 10g and 9I. We all ran the Oracle 9I driver to connect to them, and it worked very well without issue. With the addition of the 11g databases to our reporting pool, we have been forced to upgrade our ODBC connections to the 11g driver, and it has not gone well at all. I had one query that typically ran in 30 minutes take +13 hours+ to run yesterday. Speed is not the only issue, either; we have sporadic ODBC call fails, crashes, and other general failures to deal with.
Our Oracle DBAs have been trying to solve the issue, but have not yet found a solution, and each day that this goes on we fall further and further behind, as I have daily time-sensitive reports to send out that depend on this data.
One of our DBAs said she read somewhere that Oracle had not included MS Access support in the 11g driver, and that the errors were due to the imperfect connection that the driver created. I don't know of there's any truth to that, but it would provide an explanation for our troubles. We have to use Access for our reporting, as over 90% of our existing reports and processes use Access, and having to change over everything at once is just not feasible.
Is there any way to force the 9I and 11g ODBC connections to coexist, so that we don't have to use the 11g driver for our 10g databases? Or is there a better 11g driver available?
The best way to structure my schemas within a single Oracle instance to support multiple project development. At the moment, within an Oracle instance I have Area_Dev and Area1_Test schemas, with the intention that Project Xv1.0 would use Dev schema for development and Test schema for testing.
Lets say I want to start on Project Xv2.0 development while I am still finalizing Project Xv.10 development what is the best way of accommodating that, without creating individual schemas for each project?
How to merge multiple rows into single row (but multiple columns) efficiently.
For example
IDVal IDDesc IdNum Id_Information_Type Attribute_1 Attribute_2 Attribute_3 Attribute_4 Attribute_5 23 asdc 1 Location USA NM ABQ Four Seasons 87106 23 asdc 1 Stats 2300 91.7 8.2 85432 23 asdc 1 Audit 1996 June 17 1200 65 affc 2 Location USA TX AUS Hilton 92305 65 affc 2 Stats 5510 42.7 46 9999 65 affc 2 Audit 1996 July 172 1100
where different attributes mean different thing for each Information_type. For example for Information_Type=Location
Attribute_1 means Country Attribute_2 means State and so on.
For example for Information_Type=Stats
Attribute_1 means Population Attribute_2 means American Ethnicity percentage and so on.
I want to create a view that shows like below:
IDVal IDDesc IDNum Country State City Hotel ZipCode Population American% Other% Area Audit Year AuditMonth Audit Type AuditTime 23 asdc 1 USA NM ABQ FourSeasons 87106 2300 91.7 46 85432 1996 June 17 1200 65 affc 2 USA TX AUS Hilton 92305 5510 42.7 46 9999 1996 July 172 1100
As you see in the following MY_DB_URL there are two hosts for one SID. This is works perfectly for oracle driver. When one of them is gone down, connection establishes with the other.
But i have a problem. Our partner uses Golden Gate product, and they said that they must install two different oracle with two different SID names. (For Example one of them is SIDNAME_1 the other is SIDNAME_2) So i can't use this URL in my application.
Is there a way to define a DB connection URL for two different SID names in a single URL?
A single master schema where many developers are accessing. all share same password.
now i would like to trace all the changes made by each users. so i create a individual users for all and grant permission to access that schema.do i have a possibility of auditing the changes did by each user for that particular schema
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production PL/SQL Release 11.1.0.7.0 - Production CORE 11.1.0.7.0 Production TNS for Linux: Version 11.1.0.7.0 - Production NLSRTL Version 11.1.0.7.0 - Production
My os version is
Linux damdat01 2.6.18-128.7.1.el5 #1 SMP Wed Aug 19 04:00:49 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
My database is OLP system.
My question is what are the advantages and disadvantages having one single tablespace versus multiple tablespace?
Easy to maintain when you have single tablespace. but hard to track the IO issues if you have one single tablespace.
+ Oracle 11g + Centos 5.5 + I create many users by shell script (user01, user02, user03 ..... user0n) + How can I connect all user to Oracle database in Centos (may be create connect.sh) - command line env ? ...... // user01 , user02 ... ---===> connect Oracles ? My idea: using fork to create multi sqlplus to connect but it cant o_0
If all users can connect to Orcl db, I can count real user connections.
I am using dg4msql to connect to SQL server from Oracle(10.2.0.4, with AIX 5.3).
#from my laptop sqlplus (10.2.0.2)
SQL>select count(*) from table1@mssql; #works SQL>select * from table1@mssql; #ERROR
ORA-28500: connection from ORACLE to a non-Oracle system returned this message: [Oracle][ODBC SQL Server Driver]String data, right truncation {01004}[Oracle][ODBC SQL Server Driver]String data, right truncation {01004}
#from my laptop, TOAD Both queries works fine.
i have compared
"select * from nls_session_parameters;" values , TOAD and sqlpus gives same result.
I was asked if it was possible to restrict which users / or client IP's connect to my Oracle 11.2 database. I guess I could just shutdown the listener and have me and one other DBA connect to it via SSH / LOCALHOST but I was wondering if there was a more DBA specific way to restrict client connections to just two specific IP's over the Oracle listening port?
We have a custom portal application that uses a bunch of application servers. Our connection pool max size is 1100. For the past two days, we had two incidents when the cpus reached the max limit and the db was not allowing connections to come thro' for 10 minute periods. The alert log does not have any entry and the listener log does not have any entry for that 10 minute period.
Database Connection failure. Reason: java.sql.SQLException: ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist SVR4 Error: 2: No such file or directory
I'm not an Oracle expert, but I have research a little and seems that the SID could be wrong or that the DB is down, in fact I have already checked trhe server but everything seems normal to me.
While after connecting to server via my userid( its an externally id) ,after setting ORACLE_HOME and SID, while entering sqlplus / command,its not connecting.Error am getting is:-
ERROR: ORA-01034: ORACLE not available ORA-27123: unable to attach to shared memory segment HP-UX Error: 22: Invalid argument
Suppose my oracle database server IP is 128.1.1.100 in the office & the internet static IP is 115.118.33.100 is on that server. I want to retrieve the data by using oracle forms & report from my home's computer having different internet IP 115.118.33.25 on my home's computer.
what would be the settings on my home's computer for the same. i mean tnsname.ora file or any other setting.
We are currently using OCI to connect to Oracle DB using c language. Each process has its own dedicated Connection and Env handle, session handle ...
Right now we decided to use Connection Pooling. In the documentation , Connection pooling examples were using multi-threaded environment. But in our case its multi-process system and we cant modify products architecture to multi-thread.
I would like to know how we can use Connection Pooling on multiple processes.
