Question: Can you shrink SQL database while in use?

Is it OK to shrink SQL database?

When you shrink a database, you are asking SQL Server to remove the unused space from your database’s files. The process SQL uses can be ugly and result in Index fragmentation. … At worse this is causing index fragmentation, file fragmentation, and potentially causing performance problems during the shrink.

How do I make my SQL database smaller?

Using SQL Server Management Studio

  1. In Object Explorer, connect to an instance of the SQL Server Database Engine, and then expand that instance.
  2. Expand Databases, and then right-click the database that you want to shrink.
  3. Point to Tasks, point to Shrink, and then click Database. Database. …
  4. Click OK.

How long does it take to shrink SQL database?

1) Shrinking data files will not lock the database but user may experience slowness. 2) It depends on your CPU and Memory, But I think it should not take more than 30 mins.

Is Shrinking a database bad?

The major problem with the Shrink operation is that it increases fragmentation of the database to very high value. Higher fragmentation reduces the performance of the database as reading from that particular table becomes very expensive. One of the ways to reduce the fragmentation is to rebuild index on the database.

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Can I stop shrink database?

According to Microsoft’s documentation the dbcc shrinkfile process can be stopped at any time without impact, and resumed at a later time if necessary. I have some shrinkfile processes that will take up to days to complete (migrating data from old SAN to new SAN without downtime).

How do I free up space in SQL?

Freeing up space in local SQL Server Databases

  1. Shrink the DB. There is often unused space within the allocated DB files (*. mdf).
  2. Shrink the Log File. Same idea as above but with the log file (*. ldf).
  3. Rebuild the indexes and then shrink the DB. If you have large tables the indexes are probably fragmented.

How can I reduce my data size?

I would also focus on the data files only – troubleshooting and reducing transaction log size is the different topic.

  1. Find the worst offenders. …
  2. Reducing Index Fragmentation. …
  3. Implementing Data Compression. …
  4. Removing unused indexes. …
  5. Removing Redundant Indexes. …
  6. Implementing Filtered Indexes. …
  7. Using Appropriate Data Types.

How do I reduce the size of a SQL table?

Practical Tips to Reduce SQL Server Database Table Size

  1. Rule # 1 — Minimum Redundancy of Data Types.
  2. Rule # 2 — Use Database Normalization and Avoid Data Duplication.
  3. Rule # 3 — Be Careful While Selecting Indexed Columns.
  4. Rule # 4 — Use Consolidated Tables.
  5. Rule # 5 — Every Rule Has an Exception.

What is the difference between shrink database and shrink file?

If you shrink a database, all files associated with that database will be shrunk. If you shrink a file, then only the chosen file will be shrunk.

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Does shrinking a database take it offline?

3 Answers. Shrinking a database is rarely recommended as it causes index and disk fragmentation. If you do need to shrink a file the operation is an online operation and won’t take the database offline at all.

Why does DBCC Shrinkfile take so long?

Well, answer to this is very simple. DBCC SHRINKFILE is a single threaded operation. A single threaded operation does not take advantage of multiple CPUs and have no effect how many RAM are available. Hyperthreaded CPU even provides worst performance.

How do I delete unused spaces in SQL?

The best way that worked for me was first dropping the column, then running the clean table and then shrink database. And in the end re-create the column. According to documentation: CLEANTABLE reclaims space after a variable-length column is dropped.

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