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Description of Oracle block SCN/commit SCN/cleanout SCN

 I. Description There are three types of SCN in a data block of Oracle, namely the block header SCN, CSC (cleanout SCN) and commit SCN in ITL. You can dump the block to view the specific information in the block. This is organized in my previous

Transaction and two phase commit, three-phase commit protocol (finite state automata)

Transaction and two phase commit, three-phase commit protocol (finite state automata) • Acid for 1 transactionsA transaction is the fundamental to ensure that a database is permanently changed from one consistent state to another, where acid is the

Description of Oracle Block scn/commit scn/cleanout scn

Oracle Block scn/commit scn/cleanout scn description 1. description: The cache header part of the Block records a block scn, which is the timestamp of the last change of the current Block. To be exact, this update does not refer to the latest update

[Oracle]-[impact of COMMIT on indexes]-view the impact of COMMIT on indexes from the trace

[Oracle]-[impact of COMMIT on indexes]-from trace, we can see the impact of COMMIT on indexes. Recently, due to work requirements, there is a task involving data migration, therefore, I have been paying attention to the time-consuming issue of

Implicit commit of Oracle transactions

To avoid implicit commit or rollback, make sure that only one or more DML operations are submitted or rolled back. This prevents subsequent DCL or DDL operations from automatically submitting the previous D To avoid implicit commit or rollback, make

[Oracle] distributed transactions and two-phase commit (2 PC)

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 relational databases use the

Description of Oracle Block scn/commit scn/cleanout scn

I. Description There are three types of SCN in a data block of Oracle, namely the block header SCN, CSC (cleanout SCN) and commit SCN in ITL. You can dump the block to view the specific information in the block. This is organized in my previous blog:

[Oracle] distributed transactions and two-phase commit (2 PC)

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

Implicit commit of Oracle transactions

Definition of implicit commit It is also known as automatic submission, that is, the process of executing the commit statement is not displayed, and the operations in the session are automatically submitted to the database. Implicit submission 1.

Oracle monolithic architecture-memory structure, physical structure, logical structure, process

Oracle's architecture is broadly divided into two parts: Instance (instance) and database. Instance (example) : The SGA is mainly included in Oracle Instance and some processes (for example: Pmon, Smon, Dbwn, LGWR, CKPT, etc.). If a user's

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