Mssql

Connect to database.

# tsql -H 192.168.0.1 -U user -P password -p 1433
locale is "en_US.utf-8"
locale charset is "UTF-8"
using default charset "UTF-8"

connect to database from powershell

List all databases and show size used. Remove --... and use tab as separator. Print in more readable format.

sqlcmd -Q "EXEC sp_MSforeachdb 'USE [?]; EXEC sp_spaceused;';"  -h -1 -s "`t" -W | ConvertFrom-Csv -Delimiter "`t"

${HOME}/.freetds.conf (config file. .my.cnf)

[server_name]
  host = server_hostname
  port = 1433
  tds version = auto

whoami

select suser_name()
go

Via sqlcmd

sqlcmd -h -1 -s "`t" -W -Q "SELECT
 LEFT(SUSER_NAME(), 30) AS CurrentUser,
 LEFT(DB_NAME(), 30) AS CurrentDatabase,
 LEFT(HOST_NAME(), 30) AS HostName,
 LEFT(CAST(SERVERPROPERTY('MachineName') AS NVARCHAR(128)), 30) AS MachineName;"

Show tables.

SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE'
go

TABLE_CATALOG   TABLE_SCHEMA    TABLE_NAME      TABLE_TYPE
master  dbo     spt_fallback_db BASE TABLE
master  dbo     spt_fallback_dev        BASE TABLE
master  dbo     spt_fallback_usg        BASE TABLE
master  dbo     spt_monitor     BASE TABLE
master  dbo     spt_values      BASE TABLE
(5 rows affected)

create database

CREATE DATABASE database_name;
go

show databases

SELECT name FROM master..sysdatabases;
go

which version of mssql

select @@microsoftversion/0x01000000 as version;
go

show time

SQL Server 2000/2005

SELECT
CONVERT(VARCHAR(8),GETDATE(),108) AS HourMinuteSecond,
CONVERT(VARCHAR(8),GETDATE(),101) AS DateOnly
GO

SQL Server 2008

SELECT
CONVERT(TIME,GETDATE()) AS HourMinuteSecond,
CONVERT(DATE,GETDATE(),101) AS DateOnly
GO

SQL Server 2022

SELECT CONVERT(VARCHAR(33), GETDATE(), 126) AS ISODateTime;
go

Uptime in minutes

select datediff(minute,create_date, getdate()) as minutes from master.sys.databases    where name='tempdb';
go
select datediff(minute,crdate,      getdate()) as minutes from master.dbo.sysdatabases where name='tempdb';
go

use database

USE DATABASE;

show permissions

SELECT 
   class_desc 
 , CASE WHEN class = 0 THEN DB_NAME()
        WHEN class = 1 THEN OBJECT_NAME(major_id)
        WHEN class = 3 THEN SCHEMA_NAME(major_id) END [Securable]
 , USER_NAME(grantee_principal_id) [User]
 , permission_name
 , state_desc
FROM sys.database_permissions

command line with queuery

tsql -H 192.168.0.1 -U user -P password -p 1433 -o q < /tmp/tsql

queries running

SELECT sqltext.TEXT,
req.session_id,
req.status,
req.command,
req.cpu_time,
req.total_elapsed_time
FROM sys.dm_exec_requests req
CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS sqltext;
go

troubleshooting script

mssql_troubleshooting.ps1

# abjorklund script to troubleshoot mssql performance issues.
# Name of script.
$scriptName = "mssql_troubleshooting.ps1"
# Hostname
$hostname = $env:COMPUTERNAME
# Define the log file path and name with the current date
$logfile = "C:\temp\$scriptName.$hostname"
# Infinite loop that runs continuously
while ($true) {
  # Get the current date in the format yyyy-MM-dd
  $date = (Get-Date).ToString("yyyy-MM-dd")
  # Current time
  $DateWithSecond = (Get-Date).ToString("yyyy-MM-dd hh:mm:ss")
  # Define the full log file path with the current date
  $logfileWithDate = "$logfile.$date.log"
  # Write date to logfile
  (Get-Date).ToString("yyyy-MM-dd hh:mm:ss") | Out-File -Append -FilePath $logfileWithDate
  # cpu usage of machine
  $cpuUsage = Get-WmiObject Win32_Processor | Select-Object -ExpandProperty LoadPercentage ; $averageCpuUsage = ($cpuUsage | Measure-Object -Average).Average ; "cpu:{0:N0}%" -f $averageCpuUsage | Out-File -Append -FilePath $logfileWithDate
  # Memory usage of machine.
  $memory = Get-WmiObject Win32_OperatingSystem ; $totalMemory = $memory.TotalVisibleMemorySize ; $freeMemory = $memory.FreePhysicalMemory ; $usedMemory = $totalMemory - $freeMemory ; $memoryUsage = ($usedMemory / $totalMemory) * 100 ; "mem:{0:N0}%" -f $memoryUsage | Out-File -Append -FilePath $logfileWithDate
  # How many queres are running.
  sqlcmd -h -1 -s "`t" -W -r 0 -Q "SET NOCOUNT ON;SELECT 'RunningQueries=' + CAST(COUNT(*) AS VARCHAR) AS RunningQueries FROM sys.dm_exec_requests WHERE status = 'running' AND session_id <> @@SPID;" | Out-File -Append -FilePath $logfileWithDate
  # Queries over 1 second.
  sqlcmd -s "`t" -W -r 0 -Q "SET NOCOUNT ON;SELECT sqltext.TEXT AS QueryText, req.session_id, req.status, req.command, req.cpu_time, req.total_elapsed_time FROM sys.dm_exec_requests req CROSS APPLY sys.dm_exec_sql_text(req.sql_handle) AS sqltext WHERE req.total_elapsed_time > 1000 ORDER BY req.total_elapsed_time DESC;" | Out-File -Append -FilePath $logfileWithDate
  # Sleep for a certain time before running again (e.g., 1 second)
  Start-Sleep -Seconds 60
}