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SQL SERVER - Applying NOLOCK Hint at Query Level - NOLOCK for whole Transaction

SQL SERVER – Applying NOLOCK Hint at Query Level – NOLOCK for whole Transaction

April 17, 2011
Pinal Dave
SQL Tips and Tricks
SQL Scripts

Can you apply the NOLOCK hint to a whole query with OPTION (NOLOCK)? No, it fails with Msg 102. Here is how I use an isolation level instead.

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An open ledger on a reading stand with a thin sheet of glass laid over the pages.

SQL SERVER – Making Database to Read Only – Changing Database to Read/Write

April 16, 2011
Pinal Dave
SQL Tips and Tricks
SQL Backup and Restore, SQL Scripts, SQL Server

A reader attached a client database and it showed as Read Only. Two simple ALTER DATABASE scripts switch a database to READ_ONLY and back to READ_WRITE.

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SQL SERVER - Finding Location of Log File when Primary Datafile is Crashed

SQL SERVER – Finding Location of Log File when Primary Datafile is Crashed

April 15, 2011
Pinal Dave
SQL Puzzle
SQL Scripts

Do you need the primary datafile to back up the log after a crash? Vinod Kumar asked, so I tried finding the location of the log file without it.

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InMemory Table.

SQL SERVER – Transaction Log Impact Detection Using DMV – dm_tran_database_transactions

April 14, 2011
Pinal Dave
SQL Tips and Tricks

Which DMV shows the effect of a transaction on the transaction log file? My quick script uses dm_tran_database_transactions to show it per transaction.

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SQL SERVER - FIX - ERROR : Msg 3201, Level 16 Cannot open backup device . Operating system error 5(Access is denied.)

SQL SERVER – FIX – ERROR : Msg 3201, Level 16 Cannot open backup device . Operating system error 5(Access is denied.)

April 13, 2011
Pinal Dave
SQL Tips and Tricks
SQL Backup and Restore, SQL Data Storage, SQL Error Messages, SQL Server

Msg 3201, cannot open backup device, operating system error 5 (Access is denied). The SQL Server service account needed permission on the disk.

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Recent queries list.

SQL SERVER – Query to Recent Query on Server with Execution Plan Function to Get SQL

April 12, 2011
Pinal Dave
SQL Tips and Tricks
SQL Scripts

For T-SQL Tuesday on the APPLY clause, I share the script I use to see each recent query on server along with its execution plan from the cache.

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A goods receiving bench with an unopened crate on one side, sorted and labelled parts in the middle, and a filled storage rack behind

What Is ETL? Extract, Transform and Load Explained

April 11, 2011
Pinal Dave
SQL Tips and Tricks
Best Practices, Data Warehousing, Database, ETL

ETL means extract, transform and load, and only the middle word is interesting. What each stage really does, why transform eats most of the schedule, and what changes when a team says ELT instead.

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