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strong-passwords.md

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title Strong Passwords
description Learn about passwords in SQL Server and find out what constitutes a strong password to enhance security for your deployment.
author VanMSFT
ms.author vanto
ms.date 03/14/2017
ms.service sql
ms.subservice security
ms.topic conceptual
ms.custom
sfi-ropc-nochange
ignite-2025
helpviewer_keywords
logins [SQL Server], passwords
passwords [SQL Server], strong
symbols [SQL Server]
security [SQL Server], passwords
passwords [SQL Server], symbols
characters [SQL Server], password policies
strong passwords [SQL Server]
monikerRange >=aps-pdw-2016 || =azuresqldb-current || =azure-sqldw-latest || >=sql-server-2016 || >=sql-server-linux-2017 || =azuresqldb-mi-current || =fabric-sqldb

Strong Passwords

[!INCLUDE SQL Server Azure SQL Database Synapse Analytics PDW FabricSQLDB] Passwords can be the weakest link in a server security deployment. Take great care when you select a password. A strong password has the following characteristics:

  • Is at least eight characters long.

  • Combines letters, numbers, and symbol characters within the password.

  • Is not found in a dictionary.

  • Is not the name of a command.

  • Is not the name of a person.

  • Is not the name of a user.

  • Is not the name of a computer.

  • Is changed regularly.

  • Is different from previous passwords.

[!INCLUDEmsCoName] [!INCLUDEssNoVersion] passwords can contain up to 128 characters, including letters, symbols, and digits. Because logins, user names, roles, and passwords are frequently used in [!INCLUDEtsql] statements, certain symbols must be enclosed by double quotation marks (") or square brackets ([ ]). Use these delimiters in [!INCLUDEtsql] statements when the [!INCLUDEssNoVersion] login, user, role, or password has the following characteristics:

  • Contains or starts with a space character.

  • Starts with the $ or @ character.

If used in an OLE DB or ODBC connection string, a login or password containing special characters must be enclosed in braces and right braces must be escaped. For example, the password my}Pass;word must be specified in the connection string like PWD={my}}Pass;word}.

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