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What is the meaning of Log Sequence Number? I know that it is of type binary and 10bytes long and it corresponds to the time the transaction happen in DB. But is this a high precision date-time value that is stored in some efficient binary format or is this a function of date-time and something else (for example the serial number of transactions that happen at the same milli second). I did a lot of searching but couldn't find a good answer to this.
Can any one explain with a formula or function that is used to derive the LSN from date-time or anything.
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Let's talk about LSN first. LSN stands for Log Sequence Number. The transaction log stores the database activity (the transactions). For example, if we insert, delete or update data we will have a transaction registered in the Transaction log.
Copy the restore script and execute in the LSN break server, if you know the log backup only configured and run on the server. Mostly in two node alwaysON, it is configured and run more server see the following and use it. Join the database into the alwaysON group.
VLF stands for Virtual Log File. In SQL Server transaction log file is made up of one or more number of virtual log files. Too many virtual log files can cause transaction log backup to slow down as well as the database restore process.
Every record in the SQL Server transaction log is uniquely identified by a log sequence number (LSN). LSNs are ordered such that if LSN2 is greater than LSN1, the change described by the log record referred to by LSN2 occurred after the change described by the log record LSN.
From here.
You should not be concerned with how these are generated.
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