Difference between scalable and failover cluster

Difference between scalable and fail over cluster

A scalable cluster is usually associated with HPC clusters but some might argue that Oracle RAC is this type of cluster. Where the workload can be divided up and sent to many compute nodes. Usually used for a vectored workload.
A failover cluster is where a standby system or systems are available to take the workload when needed. Usually used for scalar workloads.

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Difference between RAC and MySQL Cluster !

Difference between RAC and MySQL Cluster
Please write me in well explanation , with examples , needed useful link and all other stuffs.
(1)Italian dealers/distributors for MySQL
(2)Difference between RAC and MySQL Cluster
(3)Pricing about MySQL and PostgreSQL
(4)How and which type / Way to deliver support by MySQL
(5)Security features about MySQL Vs Oracle
(6)Management Console
MySQL Vs Oracle
Thanks in advance !
MySQL Cluster

Ha ha, most amusing.
I suggest you try googling for answers to these things. This is a site dedicated to the Oracle database, the questions are answered by volunteers (not Oracle employees) and we are primarily geeks rather than marketing droids. If you have a specific Oracle question please feel free to post anytime.
Thank you for your interest.
Arrivederci, APC

Difference between Clustering and Load balancing

          What is the difference between Clustering and Load balancing?
          For example, We use Cisco Arrowpoint to do load balancing and it works fine for 3
          Sun solaris boxes/WebLogic 6.1 SP1.
          So what is the value addition to buy clustering license?
          Thanks
          Selvaraj


Hi.
          Among other things, clustering allows you to share app data (such as http session
          data) across cluster members, allowing you to failover should one cluster member
          crash.
          If your app is stateless then this doesn't mean much - load balancing alone would
          probably be ok for you.
          Regards,
          Michael
          Selvaraji wrote:
          > What is the difference between Clustering and Load balancing?
          >
          > For example, We use Cisco Arrowpoint to do load balancing and it works fine for 3
          > Sun solaris boxes/WebLogic 6.1 SP1.
          >
          > So what is the value addition to buy clustering license?
          >
          > Thanks
          >
          > Selvaraj
          Michael Young
          Developer Relations Engineer
          BEA Support

Differences Between Object And System Privileges

Hi,
Whats the difference between object and system privileges in oracle?
Cheers
Paul

System Privileges
A system privilege is the right to perform a particular action, or to perform an action on any schema objects of a particular type. For example, the privileges to create tablespaces and to delete the rows of any table in a database are system privileges.
Schema Object Privileges
A schema object privilege is a privilege or right to perform a particular action on a specific schema object:
For example, the privilege to delete rows from the departments table is an object privilege.
Some schema objects, such as clusters, indexes, triggers, and database links, do not have associated object privileges. Their use is controlled with system privileges. For example, to alter a cluster, a user must own the cluster or have the ALTER ANY CLUSTER system privilege.
A schema object and its synonym are equivalent with respect to privileges. That is, the object privileges granted for a table, view, sequence, procedure, function, or package apply whether referencing the base object by name or using a synonym.
Granting object privileges on a table, view, sequence, procedure, function, or package to a synonym for the object has the same effect as if no synonym were used. When a synonym is dropped, all grants for the underlying schema object remain in effect, even if the privileges were granted by specifying the dropped synonym.

Can you tell me some differences between R2 and R3 systems?

Hi,
Can you tell me some differences between R2 and R3 systems?
I guess R2 is used only for mainframe systems some time back. But i dont know why we prefered R3 over R2.
Please clarify this!
Thanks,
Venkatesh.R.

SAP R/3 is
Client server
3 tier
Presentation
Application
Database
Relatively hardware and database independent
ABAP/4 applications runs on application servers.
Dispatcher, shared memory, gateway, work processes are major components of an application server.
SAP R/3 offers
Comprehensive suite of integrated applications meeting the needs of most business
Best practice process design
Ability to configure to
Industry sector
Unique business requirements
In a R/2 System - it is a 2 Tier System based on Mainframe Systems with Intelligent terminals
R/3 is based 3 tier Client Server architechture and supports the R/2 system as well.
R/3 Middleware -
Client server
Uses underlying relational databases
Oracle
SQL server
Ingress
Sybase
Its graphical user interface
Sap GUI
hence R/3 is preffered over R/2 systems because they support Client Server Architecture which is easily configurable,scalable and can integrate with ERP systems and integrate with SOA or Web based Apps.
Thanks,
Saurabh Shukla

What is the difference between ntp and ctssd ?

hello everyone
could you please describe the difference between ntp and ctssd? which one should be used?
thanks
John

ntp is OS level service which synchronize the system clock with a remote server over the Network Time Protocol (NTP).
CSSD oracle processes (Cluster Services Synchronization Daemon) monitor the health of RAC nodes employing two distinct heart beats: Network heart beat and Disk heart beat. Healthy nodes will have continuous network and disk heartbeats exchanged between the nodes.

What is the difference between tkprof and explainplan

Hi,
what is the difference between tkprof and explainplan.

Execution Plans and the EXPLAIN PLAN Statement
Before the database server can execute a SQL statement, Oracle must first parse the statement and develop an execution plan. The execution plan is a task list of sorts that decomposes a potentially complex SQL operation into a series of basic data access operations. For example, a query against the dept table might have an execution plan that consists of an index lookup on the deptno index, followed by a table access by ROWID.
The EXPLAIN PLAN statement allows you to submit a SQL statement to Oracle and have the database prepare the execution plan for the statement without actually executing it. The execution plan is made available to you in the form of rows inserted into a special table called a plan table. You may query the rows in the plan table using ordinary SELECT statements in order to see the steps of the execution plan for the statement you explained. You may keep multiple execution plans in the plan table by assigning each a unique statement_id. Or you may choose to delete the rows from the plan table after you are finished looking at the execution plan. You can also roll back an EXPLAIN PLAN statement in order to remove the execution plan from the plan table.
The EXPLAIN PLAN statement runs very quickly, even if the statement being explained is a query that might run for hours. This is because the statement is simply parsed and its execution plan saved into the plan table. The actual statement is never executed by EXPLAIN PLAN. Along these same lines, if the statement being explained includes bind variables, the variables never need to actually be bound. The values that would be bound are not relevant since the statement is not actually executed.
You don’t need any special system privileges in order to use the EXPLAIN PLAN statement. However, you do need to have INSERT privileges on the plan table, and you must have sufficient privileges to execute the statement you are trying to explain. The one difference is that in order to explain a statement that involves views, you must have privileges on all of the tables that make up the view. If you don’t, you’ll get an “ORA-01039: insufficient privileges on underlying objects of the view” error.
The columns that make up the plan table are as follows:
Name Null? Type
STATEMENT_ID VARCHAR2(30)
TIMESTAMP DATE
REMARKS VARCHAR2(80)
OPERATION VARCHAR2(30)
OPTIONS VARCHAR2(30)
OBJECT_NODE VARCHAR2(128)
OBJECT_OWNER VARCHAR2(30)
OBJECT_NAME VARCHAR2(30)
OBJECT_INSTANCE NUMBER(38)
OBJECT_TYPE VARCHAR2(30)
OPTIMIZER VARCHAR2(255)
SEARCH_COLUMNS NUMBER
ID NUMBER(38)
PARENT_ID NUMBER(38)
POSITION NUMBER(38)
COST NUMBER(38)
CARDINALITY NUMBER(38)
BYTES NUMBER(38)
OTHER_TAG VARCHAR2(255)
PARTITION_START VARCHAR2(255)
PARTITION_STOP VARCHAR2(255)
PARTITION_ID NUMBER(38)
OTHER LONG
DISTRIBUTION VARCHAR2(30)
There are other ways to view execution plans besides issuing the EXPLAIN PLAN statement and querying the plan table. SQL*Plus can automatically display an execution plan after each statement is executed. Also, there are many GUI tools available that allow you to click on a SQL statement in the shared pool and view its execution plan. In addition, TKPROF can optionally include execution plans in its reports as well.
Trace Files and the TKPROF Utility
TKPROF is a utility that you invoke at the operating system level in order to analyze SQL trace files and generate reports that present the trace information in a readable form. Although the details of how you invoke TKPROF vary from one platform to the next, Oracle Corporation provides TKPROF with all releases of the database and the basic functionality is the same on all platforms.
The term trace file may be a bit confusing. More recent releases of the database offer a product called Oracle Trace Collection Services. Also, Net8 is capable of generating trace files. SQL trace files are entirely different. SQL trace is a facility that you enable or disable for individual database sessions or for the entire instance as a whole. When SQL trace is enabled for a database session, the Oracle server process handling that session writes detailed information about all database calls and operations to a trace file. Special database events may be set in order to cause Oracle to write even more specific information—such as the values of bind variables—into the trace file.
SQL trace files are text files that, strictly speaking, are human readable. However, they are extremely verbose, repetitive, and cryptic. For example, if an application opens a cursor and fetches 1000 rows from the cursor one row at a time, there will be over 1000 separate entries in the trace file.
TKPROF is a program that you invoke at the operating system command prompt in order to reformat the trace file into a format that is much easier to comprehend. Each SQL statement is displayed in the report, along with counts of how many times it was parsed, executed, and fetched. CPU time, elapsed time, logical reads, physical reads, and rows processed are also reported, along with information about recursion level and misses in the library cache. TKPROF can also optionally include the execution plan for each SQL statement in the report, along with counts of how many rows were processed at each step of the execution plan.
The SQL statements can be listed in a TKPROF report in the order of how much resource they used, if desired. Also, recursive SQL statements issued by the SYS user to manage the data dictionary can be included or excluded, and TKPROF can write SQL statements from the traced session into a spool file.
How EXPLAIN PLAN and TKPROF Aid in the Application Tuning Process
EXPLAIN PLAN and TKPROF are valuable tools in the tuning process. Tuning at the application level typically yields the most dramatic results, and these two tools can help with the tuning in many different ways.
EXPLAIN PLAN and TKPROF allow you to proactively tune an application while it is in development. It is relatively easy to enable SQL trace, run an application in a test environment, run TKPROF on the trace file, and review the output to determine if application or schema changes are called for. EXPLAIN PLAN is handy for evaluating individual SQL statements.
By reviewing execution plans, you can also validate the scalability of an application. If the database operations are dependent upon full table scans of tables that could grow quite large, then there may be scalability problems ahead. On the other hand, if large tables are accessed via selective indexes, then scalability may not be a problem.
EXPLAIN PLAN and TKPROF may also be used in an existing production environment in order to zero in on resource intensive operations and get insights into how the code may be optimized. TKPROF can further be used to quantify the resources required by specific database operations or application functions.
EXPLAIN PLAN is also handy for estimating resource requirements in advance. Suppose you have an ad hoc reporting request against a very large database. Running queries through EXPLAIN PLAN will let you determine in advance if the queries are feasible or if they will be resource intensive and will take unacceptably long to run.

What's the difference between trace and log in XI?

Hi all,
On both J2EE and ABAP, there are both tracing and logging functionalities. Can anyone explain me the difference between trace and logging?
Regards,
Hui

From SAP Notes
Log file:
A log file contains generally intelligible information for system administrators. The information is sorted by categories and is used for system monitoring. Problem sources or critical information about the status of the system are logged in this file. If error messages occur, you can determine the software component that has caused the error using the location. If the log message does not provide enough details to eliminate the problem, you can find more detailed information about the error in the trace file.
The log file is located in the file system under
"/usr/sap/[SID]/[instance]/j2ee/cluster/server[N]/log/applications.[n].log" for every N server node.
Access the file with the log viewer service of the J2EE visual administrator or with the standalone log viewer.
Trace file:
A trace file contains detailed information for developers. This information can be very cryptic and extensive. It is sorted by location, which means by software packages in the Java environment, for example, "com.sap.aii.af". The trace file is used to analyze runtime errors. By setting a specific trace level for specific locations, you can analyze the behavior of individual code segments on class and method level. The file should be analyzed by SAP developers or experienced administrators.
The trace file is located in the file system under
"/usr/sap/[SID]/[instance]/j2ee/cluster/server[N]/log/defaultTrace.[x].trc" for each N server node.
Access the file with the log viewer service of the J2EE visual administrator or with the standalone log viewer.
Regards,
Prateek

What is the difference between OEE and OSE

What is the difference b/w
Oracle8i Enterprise Edition and Oracle8i Standard Edition?
Which version I choose to install the Oracle Server?

The real difference between one and the another one are the options installed in the database. I have a document where you can see in detail what options have one and what options have the another one.
Which version I choose to install the Oracle Server?
r.- That is quite related to what options you need for your applications. Options like : partitioning, etc.
With this view you can see what options are available in your database.
SQL> select * from v$option;
PARAMETER VALUE
Partitioning TRUE
Objects TRUE
Real Application Clusters FALSE
Advanced replication TRUE
Bit-mapped indexes TRUE
Connection multiplexing TRUE
Connection pooling TRUE
Database queuing TRUE
Incremental backup and recover TRUE
y
PARAMETER VALUE
Instead-of triggers TRUE
Parallel backup and recovery TRUE
Parallel execution TRUE
Parallel load TRUE
Point-in-time tablespace recov TRUE
ery
Fine-grained access control TRUE
Proxy authentication/authoriza TRUE
tion
PARAMETER VALUE
Change Data Capture TRUE
Plan Stability TRUE
Online Index Build TRUE
Coalesce Index TRUE
Managed Standby TRUE
Materialized view rewrite TRUE
Materialized view warehouse re TRUE
fresh
Database resource manager TRUE
Spatial TRUE
PARAMETER VALUE
Visual Information Retrieval TRUE
Export transportable tablespac TRUE
es
Transparent Application Failov TRUE
er
Fast-Start Fault Recovery TRUE
Sample Scan TRUE
Duplexed backups TRUE
Java TRUE
PARAMETER VALUE
OLAP Window Functions TRUE
Block Media Recovery TRUE
Fine-grained Auditing TRUE
Application Role TRUE
Enterprise User Security TRUE
Oracle Data Guard TRUE
Oracle Label Security FALSE
OLAP TRUE
Heap segment compression TRUE
Join index TRUE
Trial Recovery TRUE
PARAMETER VALUE
Oracle Data Mining TRUE
Online Redefinition TRUE
Streams TRUE
Very Large Memory TRUE
File Mapping TRUE
48 rows selected.
SQL>
Joel P�rez

Difference between LIS and Lo extraction

Hi,
Wat is the Difference between LIS and LO extraction.
Thanks,
Sanu

HI
One good difference between lis and los is
lis uses transparent tables where as los use cluster tables
ust some infos about LIS flows....
with Plug-In 2001.2 S2xx-Structures have been replaced by Logistics Extraction Cockpit. However, R/3 releases 4.x support S2xx-Structures and Logistics Extraction Cockpit in parallel.
With new LBWE extractors there are a lot of benefits:
- Detailed Extraction: extraction can be deactivated (e.g. Schedule Line Data) leads to leaner extractors with less volume.
- Document Changes: only BW-relevant data changes will be updated (less upload volume).
- LIS-Tables are not updated reduced data volume due to avoided redundancy.
- Update with Batch-Process (V3) -> no load on daily business (but now there are available different delta methods as the direct delta...)
- No LIS-Know How necessary.
- Functional Enhancements easy to be done.
- Central, uniform maintenance tool for logistics applications (LBWE)
- No Delta-Tables (SnnnBIW1/-2) no double update, no double Data-Storage
- A lot of flows are covered: Purchasing,Inventory Controlling, Shop Floor Control, Quality Management, Shipment, Sales, Shipping, Billing, Plant Maintenance, Customer Service,
hope this helps

Difference between Table and Table Type

Hi
Can you please let me know the
Difference between Table and Table Type and
Difference between Structure and Table Type?
Regards,
Sree

hi,
table is a data dictionary object in sap. table is of different types
1. transparent tables
2. pool tables
3. cluster tables
table type gives option for u to select different types of internal tables. they r
1. standard table
2. sorted table
3. hash table
Structures :
-Defined like a table and can then be addressed from ABAP programs.
-Structures contain data only during the runtime of a program.
-Just like user-defined data type.
- they are not present in database server and only on application server.
if helpful reward some points.
with regards,
Suresh Aluri.

Difference between Null and null?

What is the difference between null and NULL?
When is each used?
Thanks,

veryConfused wrote:
There is a null in java, but no NULL. null means no value. However, when assigning value, the following is different:Although the empty String has no special role. Null means, the referential type is not assigned (doesn't refer) to a specific object. The empty String is just another object though, so seeing it or pointing it out as something special when it actually isn't at all (no more special than new Integer(0) or new Object[0]) just adds to the confusion.

Difference between GUI_UPLOAD and WS_UPLOAD

Hi,
Please make me clear about the difference between GUI_UPLOAD and WS_UPLOAD. In which cases we need to use these modules...??
Thanks,
Satish

I would suggest to always use the GUI_UPLOAD. I say this because this is the function module which is used in the GUI_UPLOAD method of the class CL_GUI_FRONTEND_SERVICES.   Really, you should probably use the class/method instead of the function module.
data: filename type string.
filename = p_file.
call method cl_gui_frontend_services=>gui_upload
         exporting
              filename                = filename
              filetype                = 'ASC'
         changing
              data_tab                = iflatf
         exceptions
              file_open_error         = 1
              file_read_error         = 2
              no_batch                = 3
              gui_refuse_filetransfer = 4
              no_authority            = 6
              unknown_error           = 7
              bad_data_format         = 8
              unknown_dp_error        = 12
              access_denied           = 13
              others                  = 17.
Regards,
Rich Heilman

Difference between char and varchar, also the difference between varchar2

Hi,
Can anyone explain me the difference between char and varchar, and also the difference between varchar and varchar2...

Varchar2 is variable width character data type, so if you define column with width 20 and insert only one character to tis column only, one character will be stored in database. Char is not variable width so when you define column with width 20 and insert one character to this column it will be right padded with 19 spaces to desired length, so you will store 20 characters in the dattabase (follow the example 1). Varchar data type from Oracle 9i is automaticlly promoted to varchar2 (follow example 2)
Example 1:
SQL> create table tchar(text1 char(10), text2 varchar2(10))
2 /
Table created.
SQL> insert into tchar values('krystian','krystian')
2 /
1 row created.
SQL> select text1, length(text1), text2, length(text2)
2 from tchar
3 /
TEXT1 LENGTH(TEXT1) TEXT2 LENGTH(TEXT2)
krystian 10 krystian 8
Example 2:
create table tvarchar(text varchar(10))
SQL> select table_name,column_name,data_type
2 from user_tab_columns
3 where table_name = 'TVARCHAR'
4 /
TABLE_NAME COLUMN_NAME DATA_TYPE
TVARCHAR TEXT VARCHAR2
Best Regards
Krystian Zieja / mob

The difference between Lion and Mountain Lion

Can some one explain to me the difference between Lion and Mtn Lion? I'm currently 10.6.8 Is it beneficiall for me to upgrade?

Mountain Lion is an enhanced version of previous OS X and so that is Mavericks.
About upgrading it all depends on what your needs are and if your hardware supports it.
System requirements for OS X Lion
System requirements for OS X Mountain Lion
OS X Mavericks: System Requirements
Please check also applications compatibility. From Lion onward, you cannot run PPC application.

Difference between scalable and failover cluster

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