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What is data file and log file?
Data files contain data and objects such as tables, indexes, stored procedures, and views. Log files contain the information that is required to recover all transactions in the database. Data files can be grouped together in filegroups for allocation and administration purposes.
What are the main reasons for keeping old log files?
Reasons to Keep a Log File
- Large data sets follow Murphy’s Law.
- While running a common script on several multiple files, a log file will give you a gist of the whole process.
- A log file will help for future reference, both for your own self and also for others who will use the script or the data set again.
What is the system log used for?
The system log (SYSLOG) is a direct access data set that stores messages and commands. It resides in the primary job entry subsystem’s spool space. It can be used by application and system programmers (through the WTL macro) to record communications about programs and system functions.
What’s the default autogrowth value for a log file?
The autogrowth default value for data files is 1MB and log files is 10% of total size of the log file. These autogrowth values are inherited from model database.
What does auto growth do in MSSQL database?
An auto-growth event is a process by which the SQL Server engine expands the size of a database file when it runs out of space. Each database file that associate with the database has an auto-growth setting. There are three different settings we can use to identify how the database files will grow.
When to set autogrowth per database growth pattern?
If you know your database growth pattern, then set autogrowth per that growth. If you don’t have any idea about your future database growth, then you should proactively monitor database file sizes and their autogrowth events for a week or month and then set it per the growth pattern.
What should the default autogrowth settings be for SQL Server?
If the database is performing frequent autogrow events, then we have a good scope of performance improvement by properly resizing the database autogrowth settings that will reduce the number of autogrow events. The autogrowth default value for data files is 1MB and log files are 10% of the total size of the log file.