Server Configuration Options (SQL Server)

Applies to: yesSQL Server (all supported versions)

You can manage and optimize SQL Server resources through configuration options by using SQL Server Management Studio or the sp_configure system stored procedure. The most commonly used server configuration options are available through SQL Server Management Studio; all configuration options are accessible through sp_configure. Consider the effects on your system carefully before setting these options. For more information, see View or Change Server Properties (SQL Server).

IMPORTANT!! Advanced options should be changed only by an experienced database administrator or certified SQL Server technician.

Categories of Configuration Options

Configuration options take effect either:

  • Immediately after setting the option and issuing the RECONFIGURE (or in some cases, RECONFIGURE WITH OVERRIDE) statement. Reconfiguring certain options will invalidate plans in the plan cache, causing new plans to be compiled. For more information, see DBCC FREEPROCCACHE (Transact-SQL).

    - or -

  • After performing the above actions and restarting the instance of SQL Server.

Options that require SQL Server to restart will initially show the changed value only in the value column. After restart, the new value will appear in both the value column and the value_in_use column.

Some options require a server restart before the new configuration value takes effect. If you set the new value and run sp_configure before restarting the server, the new value appears in the configuration options value column, but not in the value_in_use column. After restarting the server, the new value appears in the value_in_use column.

Self-configuring options are those that SQL Server adjusts according to the needs of the system. In most cases, this eliminates the need for setting the values manually. Examples include the max worker threads option and the user connections option.

Configuration Options Table

The following table lists all available configuration options, the range of possible settings, and default values. Configuration options are marked with letter codes as follows:

  • A= Advanced options, which should be changed only by an experienced database administrator or a certified SQL Server professional, and which require setting show advanced options to 1.

  • RR = Options requiring a restart of the Database Engine.

  • RP = Options that require a restart of the PolyBase Engine.

  • SC = Self-configuring options.

Configuration option Minimum value Maximum value Default
access check cache bucket count (A) 0 16384 0
access check cache quota (A) 0 2147483647 0
ad hoc distributed queries (A) 0 1 0
ADR cleaner retry timeout (min)

Introduced in SQL Server 2019
0 32767 15
ADR Preallocation Factor

Introduced in SQL Server 2019
0 32767 4
affinity I/O mask (A, RR) -2147483648 2147483647 0
affinity mask (A) -2147483648 2147483647 0
affinity64 I/O mask (A, only available on 64-bit version of SQL Server) -2147483648 2147483647 0
affinity64 mask (A, RR), only available on 64-bit version of SQL Server -2147483648 2147483647 0
Agent XPs (A) 0 1 0

(Changes to 1 when SQL Server Agent is started. Default value is 0 if SQL Server Agent is set to automatic start during Setup.)
allow polybase export

Applies to: yesSQL Server 2016 (13.x) and later.
0 1 0
allow updates (Obsolete. Do not use. Will cause an error during reconfigure.) 0 1 0
automatic soft-NUMA disabled 0 1 0
backup checksum default 0 1 0
backup compression default 0 1 0
blocked process threshold (A) 5 86400 0
c2 audit mode (A, RR) 0 1 0
clr enabled 0 1 0
clr strict security (A)
Applies to: yesSQL Server 2017 (14.x) and later.
0 1 0
column encryption enclave type (A, RR) 0 1 0
common criteria compliance enabled (A, RR) 0 1 0
contained database authentication 0 1 0
cost threshold for parallelism (A) 0 32767 5
cross db ownership chaining 0 1 0
cursor threshold (A) -1 2147483647 -1
Database Mail XPs (A) 0 1 0
default full-text language (A) 0 2147483647 1033
default language 0 9999 0
default trace enabled (A) 0 1 1
disallow results from triggers (A) 0 1 0
EKM provider enabled 0 1 0
external scripts enabled (SC) (RR)

Applies to: yesSQL Server 2016 (13.x) and later.
0 1 0
filestream_access_level 0 2 0
fill factor (A, RR) 0 100 0
ft crawl bandwidth (max)(A) 0 32767 100
ft crawl bandwidth (min)(A) 0 32767 0
ft notify bandwidth (max)(A) 0 32767 100
ft notify bandwidth (min)(A) 0 32767 0
hadoop connectivity (RP)

Applies to: yesSQL Server 2016 (13.x) and later.
0 7 0
in-doubt xact resolution (A) 0 2 0
index create memory (A, SC) 704 2147483647 0
lightweight pooling (A, RR) 0 1 0
locks (A, RR, SC) 5000 2147483647 0
max degree of parallelism (A) 0 32767 0
max full-text crawl range (A) 0 256 4
max server memory (A, SC) 16 2147483647 2147483647
max text repl size 0 2147483647 65536
max worker threads (A) 128 32767

1024 is the maximum recommended for 32-bit SQL Server, and 2048 for 64-bit SQL Server. Note: SQL Server 2014 (12.x) was the last version available on 32-bit operating system.
0

Zero auto-configures the number of max worker threads depending on the number of processors, using the formula (256 + (<processors> -4) * 8) for 32-bit SQL Server and (512 + (<processors> - 4) * 8) for 64-bit SQL Server. Note: SQL Server 2014 (12.x) was the last version available on 32-bit operating system.
media retention (A, RR) 0 365 0
min memory per query (A) 512 2147483647 1024
min server memory (A, SC) 0 2147483647 0
nested triggers 0 1 1
network packet size (A) 512 32767 4096
Ole Automation Procedures (A) 0 1 0
open objects (A, RR, obsolete) 0 2147483647 0
optimize for ad hoc workloads (A) 0 1 0
PH_timeout (A) 1 3600 60
polybase enabled (RR)

Applies to: yesSQL Server 2019 (15.x)
0 1 0
polybase network encryption 0 1 1
precompute rank (A) 0 1 0
priority boost (A, RR) 0 1 0
query governor cost limit (A) 0 2147483647 0
query wait (A) -1 2147483647 -1
recovery interval (A, SC) 0 32767 0
remote access (RR) 0 1 1
remote admin connections 0 1 0
remote data archive 0 1 0
remote login timeout 0 2147483647 10
remote proc trans 0 1 0
remote query timeout 0 2147483647 600
Replication XPs Option (A) 0 1 0
scan for startup procs (A, RR) 0 1 0
server trigger recursion 0 1 1
set working set size (A, RR, obsolete) 0 1 0
show advanced options 0 1 0
SMO and DMO XPs (A) 0 1 1
suppress recovery model errors (A)

YesAzure SQL Managed Instance
0 1 0
tempdb metadata memory-optimized (A)

Applies to: yesSQL Server 2019 (15.x).
0 1 0
transform noise words (A) 0 1 0
two digit year cutoff (A) 1753 9999 2049
user connections (A, RR, SC) 0 32767 0
user options 0 32767 0
xp_cmdshell (A) 0 1 0

See also

sp_configure (Transact-SQL) RECONFIGURE (Transact-SQL) DBCC FREEPROCCACHE (Transact-SQL)