As part of SQL Server’s processing algorithm for a query, SQL will recommend creating an index which it believes will help the query run faster – hence called Missing Index. You have to take this recommendation with a grain of salt. although SQL Server is very good at determining when an index is needed but sometimes it is not so good on the index recommendation.

I have been using this script for a few years now, donot remember where I got it from but I think it may be based off Glenn Berry’s Diagnostic Script.
The query below will show suggested missing index for a specified database. You can run it for a specified table by uncommenting the AND clause and specifying the table name.
Keep in mind that these missing index gets reset every time SQL Server is restarted, therefore if you have rebooted the server or restarted sql server recently you may not have the index stats updated yet.

USE DatabaseName
GO
 
SELECT db.[name] AS [DatabaseName]
    ,id.[object_id] AS [ObjectID]
	,OBJECT_NAME(id.[object_id], db.[database_id]) AS [ObjectName]
    ,id.[statement] AS [FullyQualifiedObjectName]
    ,id.[equality_columns] AS [EqualityColumns]
    ,id.[inequality_columns] AS [InEqualityColumns]
    ,id.[included_columns] AS [IncludedColumns]
    ,gs.[unique_compiles] AS [UniqueCompiles]
    ,gs.[user_seeks] AS [UserSeeks]
    ,gs.[user_scans] AS [UserScans]
    ,gs.[last_user_seek] AS [LastUserSeekTime]
    ,gs.[last_user_scan] AS [LastUserScanTime]
    ,gs.[avg_total_user_cost] AS [AvgTotalUserCost]  -- Average cost of the user queries that could be reduced by the index in the group.
    ,gs.[avg_user_impact] AS [AvgUserImpact]  -- The value means that the query cost would on average drop by this percentage if this missing index group was implemented.
    ,gs.[system_seeks] AS [SystemSeeks]
    ,gs.[system_scans] AS [SystemScans]
    ,gs.[last_system_seek] AS [LastSystemSeekTime]
    ,gs.[last_system_scan] AS [LastSystemScanTime]
    ,gs.[avg_total_system_cost] AS [AvgTotalSystemCost]
    ,gs.[avg_system_impact] AS [AvgSystemImpact]  -- Average percentage benefit that system queries could experience if this missing index group was implemented.
    ,gs.[user_seeks] * gs.[avg_total_user_cost] * (gs.[avg_user_impact] * 0.01) AS [IndexAdvantage]
    ,'CREATE INDEX [IX_' + OBJECT_NAME(id.[object_id], db.[database_id]) + '_' + REPLACE(REPLACE(REPLACE(ISNULL(id.[equality_columns], ''), ', ', '_'), '[', ''), ']', '') + CASE
        WHEN id.[equality_columns] IS NOT NULL
            AND id.[inequality_columns] IS NOT NULL
            THEN '_'
        ELSE ''
        END + REPLACE(REPLACE(REPLACE(ISNULL(id.[inequality_columns], ''), ', ', '_'), '[', ''), ']', '') + '_' + LEFT(CAST(NEWID() AS [nvarchar](64)), 5) + ']' + ' ON ' + id.[statement] + ' (' + ISNULL(id.[equality_columns], '') + CASE
        WHEN id.[equality_columns] IS NOT NULL
            AND id.[inequality_columns] IS NOT NULL
            THEN ','
        ELSE ''
        END + ISNULL(id.[inequality_columns], '') + ')' + ISNULL(' INCLUDE (' + id.[included_columns] + ')', '') AS [ProposedIndex]
    ,CAST(CURRENT_TIMESTAMP AS [smalldatetime]) AS [CollectionDate]
FROM [sys].[dm_db_missing_index_group_stats] gs WITH (NOLOCK)
INNER JOIN [sys].[dm_db_missing_index_groups] ig WITH (NOLOCK) ON gs.[group_handle] = ig.[index_group_handle]
INNER JOIN [sys].[dm_db_missing_index_details] id WITH (NOLOCK) ON ig.[index_handle] = id.[index_handle]
INNER JOIN [sys].[databases] db WITH (NOLOCK) ON db.[database_id] = id.[database_id]
WHERE  db.[database_id] = DB_ID()
--AND OBJECT_NAME(id.[object_id], db.[database_id]) = 'YourTableName'
ORDER BY ObjectName, [IndexAdvantage] DESC
OPTION (RECOMPILE);

Hope this helps in resolving index issues in your database environment.

This SQL query will provide a list of tables in a database with the number of rows

select schema_name(tab.schema_id) + '.' + tab.name as [tablename],
       sum(part.rows) as [rowcount]
   from sys.tables as tab
        inner join sys.partitions as part
            on tab.object_id = part.object_id
where part.index_id IN (1, 0) -- 0 - table without PK, 1 table with PK
group by schema_name(tab.schema_id) + '.' + tab.name
order by sum(part.rows) desc

Each row represents each table. This will also include all the tables in the a database even the empty ones.

Here is a handy sql script to get a list of tables by their size in Azure SQL Database

select schema_name(tab.schema_id) + '.' + tab.name as [tablename],

    cast(sum(spc.used_pages * 8)/1024.00 as numeric(36, 2)) as used_spacemb,

    cast(sum(spc.total_pages * 8)/1024.00 as numeric(36, 2)) as allocated_spacemb

from sys.tables tab

    inner join sys.indexes ind

        on tab.object_id = ind.object_id

    inner join sys.partitions part

        on ind.object_id = part.object_id and ind.index_id = part.index_id

    inner join sys.allocation_units spc

        on part.partition_id = spc.container_id

group by schema_name(tab.schema_id) + '.' + tab.name

order by sum(spc.used_pages) desc

 

The columns you will get from this script:

tablename

size_mb

allocated_spacemb

Here is a sql script to grant a user permission to a database schema

GRANT SELECT, INSERT, UPDATE, DELETE ON SCHEMA :: <schema> TO <dbuser>;

Now if you need to deny a database user any specific permissions to an object

DENY SELECT, INSERT, UPDATE, DELETE  ON OBJECT::<schema>.<object> TO <dbuser>;