oracle commit wait

Oracle is still more commonly used, so I studied Oracle COMMIT, here to share with you, I hope to be useful. The user can issue a commit,oracle commit trigger LGRW only if the last block of all rows affected by the SQL statement i

Today, in Oracle's SQL plus run the delete and query operations, and then run the query in PL/SQL, the same, the result is not the same, let me feel depressed, and then suddenly thought may be on both sides of the data inconsistency caused, but why inconsistent, is useless commit,I looked it up on the internet, which is probably what I said:DML language, such as Update,delete,insert and other changes to the data in the table need to

Today, oracle SQL plus performed the delete and query operations and then the query operations in PL/SQL. The results of the same statements were different, which made me feel quite depressed, later, I suddenly thought that the data on both sides may be inconsistent, but why is it inconsistent? It means no use of commit, I checked it on the Internet, which is probably like this: DML language, such as update

Before looking at this article, make sure that you understand the concept of Oracle transactions and locks as it is, but do not understand, refer to the consistency and atomicity of database transactions and Oracle TM and TX Locks1. Commit a transactionA transaction can be committed when execution uses a commit stateme

Oracle's wait events are an important basis for measuring Oracle health and metrics. The concept of wait events was introduced in Oracle7.0.1.2, with roughly 100 waiting events. This number is increased to approximately 150 in Oracle 8.0, with approximately 200 events in oracle8i and approximately 360 waiting events in

In oracle, the time used by commit is not affected by the transaction size. The overhead of commit has two factors: the round-trip communication with the database. If each record is submitted, the generated round-trip traffic will be much larger. Each submission must wait for the redo to be written to the disk;Execute

one or more DML operations are submitted or rolled back after they are completed. This prevents subsequent DCL or DDL operations from automatically submitting DML operations. Nature of implicit commit 1. A ddl statement executes commit twice. Commit; Ddl statement; Commit; The first

The Oracle COMMIT statement is expected to help you understand it. The following describes how to process the Oracle COMMIT statement. Oracle COMMIT statement processing sequenceWhen a transaction is committed,

Generally, when you submit an SQL statement, there will always be one or more waiting events. That is to say, the process has to wait because the required resources are occupied. Oracle provides us with an available view of these wait events. Based on these views, we can know which events cause the SQL statement to be inefficient and modify or adjust accordingly.

Oracle wait events are an important basis and indicator for measuring the operating status of oracle. The concept of wait events is introduced in oracle7.0.1.2, with approximately 100 wait events. In Oracle 8.0, this number was in

to be related to the transaction commit rollback, indicating that there are too many commits or short transactions. Check whether batch submission, log file size, and buffer size are reasonable. 5. SummaryA. The waiting events of Oracle body supply can quickly locate the waiting events that the specified Sid is going through. Reference: Oracle owi

submitted to the Database "not spared" when executing the ddl statement. 2. Even if the ddl statement execution fails, the previous dml operations will be submitted to the database. This is a bit strange. ddl execution fails. How can I submit it? This requires us to explore the nature of implicit commit (as described below ). 3. Summary based on previous 1 and 2 To avoid implicit commit or rollback, make s

Distributed transactions are transactions that occur between multiple databases. Oracle uses the dblink Method for transaction processing. distributed transactions are much more complex than standalone transactions. Most customs Distributed transactions are transactions that occur between multiple databases. Oracle uses the dblink Method for transaction processing. distributed transactions are much more com

Before finishing an article: Oracle Wait Events Http://blog.csdn.net/tianlesoftware/archive/2010/05/31/5635934.aspx one. Knowledge of waiting events: 1.1 Wait events can be divided into two main categories, that is, idle (IDLE) Wait events and non idle (non-idle) wait even