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Log shipping is the process of automating the backup of transaction log files on a primary (production) database server, and then restoring them onto a standby server. This technique is supported by Microsoft SQL Server , [ 1 ] 4D Server , [ 2 ] MySQL , [ 3 ] and PostgreSQL .
This implies database logs are constructed in linked list form. Transaction ID number: A reference to the database transaction generating the log record. Type: Describes the type of database log record. Information about the actual changes that triggered the log record to be written.
Log-based: Some DAM systems analyze and extract the information from the transaction logs (e.g., the redo logs). These systems use the fact that much of the data is stored within the redo logs and they scrape these logs. Unfortunately, not all of the information that is required is in the redo logs.
A simple transaction is usually issued to the database system in a language like SQL wrapped in a transaction, using a pattern similar to the following: Begin the transaction. Execute a set of data manipulations and/or queries.
A transaction manager is middleware which sits between an app service (back-end application service) and the operating system. A transaction manager can provide global isolation and atomicity. It tracks when new servers join a transaction and coordinates an atomic commit protocol among the servers. The details are abstracted from the app ...
In relational databases, the log trigger or history trigger is a mechanism for automatic recording of information about changes inserting or/and updating or/and deleting rows in a database table. It is a particular technique for change data capturing , and in data warehousing for dealing with slowly changing dimensions .
A write ahead log is an append-only auxiliary disk-resident structure used for crash and transaction recovery. The changes are first recorded in the log, which must be written to stable storage, before the changes are written to the database. [2] The main functionality of a write-ahead log can be summarized as: [3]
Specifically, a transaction log is a log of the communications between a system and the users of that system, [2] or a data collection method that automatically captures the type, content, or time of transactions made by a person from a terminal with that system. [3]