Oracle Database - Log Writer (lgwr)

Card Puncher Data Processing

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Data System Architecture
Concurrency - Latches (System Lock)

Latches are like semaphores. Latches are used to guarantee physical consistency of data, while locks are used to assure logical consistency of data. Latches are simple, low-level system lock (serialization...
Card Puncher Data Processing
Oracle Database - Background Process

Persistent processes that make up an instance. This background processes are started from Linux/Windows with the help of only one binary executable program named oracle. The background process are then...
Card Puncher Data Processing
Oracle Database - COMMIT (of a transaction)

in oracle A commit ends the current transaction and makes permanent all changes performed in the transaction. When a transaction commits, the following actions occur: A system change number...
Card Puncher Data Processing
Oracle Database - System Change Numbers (SCNs) - Point in time

A system change number (SCN) is a logical, internal time stamp used by Oracle Database. SCNs order events that occur within the database, which is necessary to satisfy the ACID properties of a transaction....

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