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Network in Software Receive Code-39 in Software Network

Network using barcode encoding for software control to generate, create code 39 image in software applications. Microsoft Word Other areas to barcode code39 for None consider are the Network and Database Schema design. Starting with the Network, this is fundamental to a data replication solution. If you have a slow network, you will not be able to replicate high volumes of data in real-time.

Furthermore, should your network be unreliable, you need to consider the cost of retransmission or transmitting a backlog of trail files. Redundant networks are very important too and can help to alleviate this problem. If you can avoid the network outage altogether by routing data over a backup network, it will save a number of problems.

. [ 28 ]. 1 . Database schema Database Schem Code 3/9 for None a design is another important consideration. Imagine a schema where every table is related to nearly every other table, and the cascading referential constraints are so complex, that it would be impossible to logically separate groups of related tables for data extract. GoldenGate does provide a solution to this problem by using the @RANGE function.

However, this is not ideal. Apart from the complex configuration, GoldenGate has to spend more CPU processing the configuration filters and artificially "splitting" the data into a pre-defined number of trails. A good schema design would be to ensure that logical separation exists between table groups, allowing a simple, effective configuration that performs well.

The number of table groups being directly proportional to the number of Extract processes configured.. What to Replicate Another key de Software Code-39 cision in any GoldenGate implementation is what data to replicate. There is little point replicating data that doesn"t need to be, as this will cause unnecessary additional overhead. Furthermore, if you decide that you need to replicate everything, GoldenGate may not necessarily provide the best solution.

Other products such as Oracle 11g Active Data Guard may be more appropriate. The forthcoming paragraphs talk not only about what to replicate but also how to replicate, plus important functional and design considerations..

Object mapping and data selection The power of G 3 of 9 for None oldenGate comes into its own when you select what data you wish to replicate, by using its inbuilt tools and functions. You may even wish to transform the data before it hits the target. There are numerous options at your disposal, but choosing the right combination is paramount.

The configuration of GoldenGate includes mapping of source objects to target objects. Given the enormity of parameters and functions available, it is easy to over complicate your GoldenGate Extract or Replicat process configuration through redundant operations. Try to keep your configuration as simple as possible, choosing the right parameter, option, or function for the job.

Although it is possible to string these together to achieve a powerful solution, this may cause significant additional processing and performance will suffer as a result.. [ 29 ]. Getting Started GoldenGate pro vides the ability to select or filter out data based on a variety of levels and conditions. Typical data mapping and selection parameters are as follows: TABLE/MAP Specifies the source and target objects to replicate. TABLE is used in Extract and MAP in Replicat parameter files.

Similar to the SQL WHERE clause, the WHERE option included with a TABLE or MAP parameter enables basic data filtering. Provides complex data filtering. The FILTER option can be used with a TABLE or MAP parameter.

The COLS and COLSEXCEPT option allows columns to be mapped or excluded when included with a TABLE or MAP parameter.. WHERE FILTER COLS/COLSEXCEPT Before GoldenG ate can extract data from the databases" online redo logs, the relevant data needs to be written to its log files. A number of pre-requisites exist to ensure the changed data can be replicated: Enable supplemental logging. Setting at database level overrides any NOLOGGING operations and ensures all changed data is written to the redo logs.

Forces the logging of the full before and after image for updates. Ensure each source table has a primary key. GoldenGate requires a primary key to uniquely identify a row.

If the primary key does not exist on the source table, GoldenGate will create its own unique identifier by concatenating all the table columns together. This can be grossly inefficient given the volume of data that needs to be extracted from the redo logs. Ideally, only the primary key plus the changed data (before and after images in the case of an update statement) are required.

. It is also adv Code 39 Extended for None isable to have a primary key defined on your target table(s) to ensure fast lookup when the Replicat recreates and applies the DML statements against the target database. This is particularly important for UPDATE and DELETE operations..

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