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Types
Event logs
Event logs record events taking place in the execution of a system that can be used to understand the activity of the system and to diagnose problems. They are essential to understand particularly in the case of applications with little user interaction.
It can also be useful to combine log file entries from multiple sources. It is a different combination that may yield between with related events on different servers. Other solutions employ network-wide querying and reporting.[1][2]
Transaction logs
Most database systems maintain some kind of transaction log, which are not mainly intended as an audit trail for later analysis, and are not intended to be human-readable. These logs record changes to the stored data to allow the database to recover from crashes or other data errors and maintain the stored data in a consistent state. Thus, database systems usually have both general event logs and transaction logs.[3][4][5][6]
The use of data stored in transaction logs of Web search engines, Intranets, and Web sites can provide valuable insight into understanding the information-searching process of online searchers.[7] This understanding can enlighten information system design, interface development, and devising the information architecture for content collections.
Message logs
Internet Relay Chat (IRC), instant messaging (IM) programs, peer-to-peer file sharing clients with chat functions, and multiplayer games (especially MMORPGs) commonly have the ability to automatically save textual communication, both public (IRC channel/IM conference/MMO public/party chat messages) and private chat between users, as message logs.[8] Message logs are almost universally plain text files, but IM and VoIP clients (which support textual chat, e.g. Skype) might save them in HTML files or in a custom format to ease reading or enable encryption.
In the case of IRC software, message logs often include system/server messages and entries related to channel and user changes (e.g. topic change, user joins/exits/kicks/bans, nickname changes, the user status changes), making them more like a combined message/event log of the channel in question, but such a log is not comparable to a true IRC server event log, because it only records user-visible events for the time frame the user spent being connected to a certain channel.
Instant messaging and VoIP clients often offer the chance to store encrypted logs to enhance the user's privacy. These logs require a password to be decrypted and viewed, and they are often handled by their respective writing application. Some privacy focused messaging services, such as Signal, record minimal logs about users, limiting their information to connection times.[9]
Server logs
A server log is a log file (or several files) automatically created and maintained by a server consisting of a list of activities it performed.
A typical example is a web server log which maintains a history of page requests. The W3C maintains a standard format (the Common Log Format) for web server log files, but other proprietary formats exist.[2] Some servers can log information to computer readable formats (such as JSON) versus the human readable standard.[10] More recent entries are typically appended to the end of the file. Information about the request, including client IP address, request date/time, page requested, HTTP code, bytes served, user agent, and referrer are typically added. This data can be combined into a single file, or separated into distinct logs, such as an access log, error log, or referrer log. However, server logs typically do not collect user-specific information.
These files are usually not accessible to general Internet users, only to the webmaster or other administrative person of an Internet service. A statistical analysis of the server log may be used to examine traffic patterns by time of day, day of week, referrer, or user agent. Efficient web site administration, adequate hosting resources and the fine tuning of sales efforts can be aided by analysis of the web server logs.
See also
- Digital traces – One's unique set of traceable digital activities
- Log management
- Logging as a service – Software architecture for ingesting logs
- XML log
- Tracing (software) § Event logging - comparing software tracing with event logging
- Security event management § Event logs - with a focus on security management
References
- ^ "Log File Viewer - SQL Server". learn.microsoft.com. 28 February 2023.
- ^ a b "Extended Log File Format". www.w3.org.
- ^ "The Transaction Log (SQL Server) - SQL Server". learn.microsoft.com. 27 September 2023.
- ^ Stankovic, Ivan (February 11, 2014). "A beginner's guide to SQL Server transaction logs".
- ^ "Understanding the importance of transaction logs in SQL Server". TechRepublic. November 11, 2004.
- ^ "Logfiles". www.neurobs.com.
- ^ Jansen, Bernard J. (2006). "Search log analysis: What it is, what's been done, how to do it". Library & Information Science Research. 28 (3). Elsevier BV: 407–432. doi:10.1016/j.lisr.2006.06.005. ISSN 0740-8188.
- ^ "LogFile Class (Microsoft.SqlServer.Management.Smo)". learn.microsoft.com.
- ^ Brandom, Russell (2 January 2018). "Iran blocks encrypted messaging apps amid nationwide protests". The Verge. Vox Media. Archived from the original on 22 March 2018. Retrieved 23 March 2018.
- ^ Server, Caddy Web. "How Logging Works - Caddy Documentation". caddyserver.com.