Every Question..What does it mean? Why is this? How it works?
Microsoft .Net (pronounced dot (.) net) may be a package element that runs on the Windows software package.
.Net provides tools and libraries that change developers to form Windows package a lot of quicker and easier.
Microsoft describes it as:".Net is that the Microsoft internet Service strategy to attach data, people,
system and devices through software".I'm Choulla Naresh..!
You can retrieve the last executed queries using the following query:
SELECT deqs.creation_time, dest.text AS QueryText, deqs.execution_count, deqs.total_worker_time, deqs.total_physical_reads, deqs.total_logical_reads FROM sys.dm_exec_query_stats AS deqs CROSS APPLY sys.dm_exec_sql_text(deqs.sql_handle) AS dest ORDER BY deqs.creation_time DESC;
This gives you a list of recently executed queries along with execution statistics.
To identify blocked sessions and the session causing the block:
SELECT blocking_session_id AS BlockingSession, session_id AS BlockedSession, wait_type, wait_time, wait_resource FROM sys.dm_exec_requests WHERE blocking_session_id <> 0;
This query shows all sessions that are currently blocked and the blocking session’s ID.
You can backup a database using the following command:
BACKUP DATABASE YourDatabaseName TO DISK = 'C:\Backup\YourDatabaseName.bak';
This command creates a backup of the YourDatabaseName database to the specified location.
To enable the execution plan for a query, run:
SET SHOWPLAN_ALL ON;
Then run your query. The execution plan will be displayed as part of the result. To turn off the execution plan, use:
SET SHOWPLAN_ALL OFF;
You can use the following query to find the largest tables by data size:
SELECT t.NAME AS TableName, p.rows AS RowCounts, SUM(a.total_pages) * 8 AS TotalSpaceKB, SUM(a.used_pages) * 8 AS UsedSpaceKB, (SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS UnusedSpaceKB FROM sys.tables t INNER JOIN sys.indexes i ON t.OBJECT_ID = i.object_id INNER JOIN sys.partitions p ON i.object_id = p.OBJECT_ID AND i.index_id = p.index_id INNER JOIN sys.allocation_units a ON p.partition_id = a.container_id WHERE t.NAME NOT LIKE 'dt%' AND i.OBJECT_ID > 255 GROUP BY t.Name, p.Rows ORDER BY TotalSpaceKB DESC;
This query returns the largest tables by row count and space usage.
You can get the list of all users in a database using this query:
SELECT name AS Username FROM sys.database_principals WHERE type IN ('S', 'U') -- 'S' for SQL user, 'U' for Windows user AND name NOT LIKE '##%'; -- Exclude system users
This lists all users in the current database.
Use the following query to find currently running queries:
SELECT r.session_id, r.start_time, s.text AS query_text, r.status, r.command, r.total_elapsed_time FROM sys.dm_exec_requests r CROSS APPLY sys.dm_exec_sql_text(r.sql_handle) s;
This returns details about all currently running queries, including the session ID, query text, and execution status.
You can check the status of running transactions using this query:
SELECT session_id, transaction_id, database_id, transaction_begin_time, transaction_state, transaction_status
FROM sys.dm_tran_active_transactions;
You can use the following query to list all tables in the current database:
SELECT TABLE_NAME
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_TYPE = 'BASE TABLE' AND TABLE_CATALOG = 'YourDatabaseName';
This query returns the names of all base tables in the specified database.
You can check the size of a database using the following query:
EXEC sp_spaceused;
Or, for a specific database:
USE YourDatabaseName;
EXEC sp_spaceused;