What Is A Transaction In Sql Server – The SQL Server transaction log is similar to the ‘Black Box’ on an airline plane. It contains all records of transactions made against the database. This information is a gold mine for auditing, database, restoration and so on. But it is not intended for end users to show less in an easy-to-read or use way for DBA tasks. Therefore, the use of this information may be the least difficult to say.
For example, open an LDF file in a hexadecimal editor and look inside. As you can see, this is data that is not meant to be processed directly by humans at least.
What Is A Transaction In Sql Server
Despite the challenges in the data formats of LDF and TRN files, there are some solutions to delete this information and delete it to the point where it can start to be useful. We will find out in this article.
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Fn_dblog is a SQL Server function, although not indexed, that can be used to decode active areas of the SQL transaction log online.
Another solution is available in the form fn_dump_dblog, which overcomes the limit of fn_dblog as it can only read active / online activity logs.
Next on our list is DBCC PAGE, another useful command for reading SQL Server transaction logs that can only read MDF and LDF database files. Although, like others, it is not confirmed
The results are not displayed by default unless you turn on the 3604 flag first. When set, the results will be displayed.
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The result is fewer errors, nasty head and other visual noise. This can be ignored, but the result will still be in hexadecimal format.
The hexadecimal results are not really intended to be interpreted by people, which makes translating this data into a meaningful decision.
SQL Server transaction log reader, audit and recovery tool. It can read online encrypted transaction logs as well as backups of transaction logs, including compressed files.
The ApexSQL Log can read all operations, including DDL and DML, in a series of data sources, transaction logs, and generate do-not or repeat scripts. It can even read the operation before the product is installed.
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ApexSQL Log, unlike the solutions described above, offers great capabilities to increase the value of log readings by processing encrypted and hidden log data into processed and easy-to-understand information, including objects, dates, and times. History changes, including before and after ethics. .
Nesha is an IT engineer and SQL enthusiast specializing in SQL Server Compliance Auditing and Disaster Relief since 2012.
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Before reading this article, it is recommended to check out the previous article of the SQL Server transaction log series (see TOC below) to familiarize yourself with the various concepts related to the SQL transaction log that you will encounter in This article.
When creating a user database, the default size and automatic growth of the transaction log file SQL Server emulates the default size and automatic growth settings of the system database, also known as the sample database. . By default, the initial size of the SQL transaction log file for the newly created database is 8MB, with an automatic increment of 64MB, as shown on the file page of the database properties window below:
It is recommended to set the initial size and automatic growth of the transaction log to an acceptable value. Although not the best value for the initial size of the transaction log file with automatic growth that fits all situations, the initial size setting of the SQL transaction log to 20-30% of the size of the database file with automatic growth . . Generally more than 1024MB depending on your database growth plan can be considered a good starting point for a normal workload. In this way, we will avoid the problem of frequent and small increase in the size of the SQL transaction log file, which may cause a delay in the query due to interruption of all logging process until the process of increasing the size of the log. Is completed and given a large number of virtual memory files. Please also note that the transaction log file does not take advantage of the option to start the file immediately, which slows down the transaction log process.
Installing SQL Server Operating Logs The initial size of the tempdb system database with a considerable number should be considered from the beginning. This is due to the fact that restarting the SQL Server instance will drop the tempdb data and log files and recreate them with the original size and growth rate automatically. If the tempdb SQL Transaction Log file is configured with a small initial size, the additional costs incurred by increasing the size of the temdb Transaction Log will affect the performance of the tempdb database.
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Another factor to consider is the maximum size that SQL Server transaction log files can reach. Two things should be considered when determining maximum size; Prevents transaction log files from filling out disk drives and prevents databases from accessing when transaction log files run out of space as follows:
After providing the appropriate values for the initial size, automatic growth, and maximum file size, we should review the SQL Server transaction log file and track the growth of the database file when managing the upload and follow that growth. Volume. sys.dm_db_log_space_usage The DMV can be used to control log size in a specific database. It provides information about the amount of memory currently in use and whether the SQL transaction log needs to be truncated:
Note: For more information about actions that cause transaction log files to increase and how to monitor and manage them, see
SQL Server gives us the ability to create more than one SQL transaction log file per database. But we need to distinguish between the pros and cons of having more than one SQL Server Transaction Log file in your database. This decision is based on the architecture of the transaction log file and the fact that the transaction log is subsequently written in the transaction log without performing parallel I / O operations if there are multiple SQL transaction log files. On the other hand, SQL Server Engine will continue to write to the first transaction log until there is no space, then it will start writing to the second and so on.
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Creating multiple SQL transaction log files does not improve query processing, but can only help if an expansion of the transaction log size is necessary, but the current disk space will run out without compensation.
Virtual log files, also known as VLFs, are small logical units for storing SQL transaction logs in transaction log files.
A large number of VLFs in the transaction log file cause the file to grow over and over again into smaller fragments each time the size increase can cause serious problems.
This can be seen as a form of a long recovery period during SQL Server service startup, database connection, or backup and restore operations. This is due to the fact that during the database restore process, the SQL Server host will read all the VLFs to forward the committed operation and return what failed to keep the database in a consistent state.
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Note: For more information about controlling VLF numbers in the SQL transaction log file and how to troubleshoot multiple VLF checks.
Because the sequence of writes in the transaction log file differs from the random write sequence using the completion algorithm consistent with database database files, it is strongly recommended to save the SQL transaction log file on a separate storage section. Separately, not just save them. At different points to separate the effect of successive workloads on random workloads. For intensive transaction log storage, use an enterprise-class SSD drive or minimum RAID 10 storage technology.
The database restore template option specifies how SQL Server handles database transaction logs. SQL Server provides us with three types of download templates: full version, bulk stock, and simple download templates.
The recovery model of any new database will be the same as the recovery model of the instance database, which is the complete recovery model by default. The decision of which recovery model should be installed for any new database should be based on several factors. For example, if this database will be involved in any of the highly available solutions such as
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