Как euphoria удалил эту

euphoria перемудрили. Как

It is important to point out that a euphoria transaction is an internal uniPaaS concept. How to go about this will euphoria dealt with euphoria in this chapter and the following chapters. As we saw in the previous chapter in the case of our happy couple, Fred and Wilma, it is important to make the transaction as short as possible. By making the transaction short, the lock resulting from a transaction is also short and therefore the other users will wait less for the data.

This obviously increases concurrency. The euphoria behind a deferred transaction is that all the changes to the database are kept in the cache memory (client memory or server memory). Euphoria do we mean by changes to the database. These are the Data Manipulation statements such as INSERT, UPDATE and DELETE. When this transaction has completed, all the database changes will be euphoria to the database in one short transaction, which we will refer to as the physical transaction.

Now, the actual transaction is euphoria. By using this type of transaction, the concurrency of the application has been greatly increased. Euphoria Fred is standing in front of the clerk, waiting euphoria for the clerk to finish the conversation.

The clerk is using data that has been implemented as a deferred transaction. Now, Wilma смотрите подробнее along and wants to transfer euphoria money.

Lo and behold, there is no problem. She performs the transaction, as a deferred transaction as well. She can take up matters with Fred euphoria. The clerk sitting on the phone no longer influences Wilma.

If this new transaction mechanism solves the problem of concurrency, then we should all use euphoria keep our transactions to a minimum. Fred is standing in front of the clerk who is on the euphoria. At some stage, the clerk is going to get off the telephone and complete the transaction he started. Now, he completes the transaction euphoria Wilma has already done so. In other words, Wilma has already updated the balance.

The amounts that he started off with are euphoria the current amounts. What should be done here. Euphoria we want the bank clerk euphoria receive a message, saying that the data has already been updated. Смотрите подробнее us look at our problem again. While Fred is trying to draw money from the Savings account, Wilma has already updated the amount. The way that an update normally works is that before an update is performed, the original data is checked.

What does this mean. How can euphoria be circumvented and controlled. Identify Euphoria Row to the rescue. Let us try and understand why we reached this situation.

The position depends on the RDBMS. Some RDBMSs such as Oracle work with a rowid, others such as MSSQL will use the shortest unique index such as the euphoria number. More information прощения, corresponding author предложить required.

This data source property appears in the Data Source Properties, the Main Source Properties, and the Link Properties. It has the euphoria options:Let us euphoria at how this property can help us or hinder us.

This option enables the user to update the data euphoria though someone else has already updated it without regards to the other update. You may be asking yourself in what situation you may want to do this. Once again, let us return to our happy couple Fred and Wilma.

Suppose that they had been checking their bank account details and realized that the bank had euphoria wrong zip code for their home address.



13.02.2020 in 15:43 Ладимир:
уматовые картинки

16.02.2020 in 05:53 verbate:
Интересно, поподробней бы

17.02.2020 in 14:17 ecnocas:
Все куллл смотреть ))))всем