Size of Filegroups and Files

In recent posts I looked at queries that show us data at the instance, the database, backups and now we will look at filegroups and the individual physical files.

Too many times disk space is not an issue, it is THE issue.  This query will show several key attributes of our database at the file level including:

  • List of filegroups for a database
  • List of files that are members of the filegroup
  • The amount of space ALLOCATED for the data file
  • The amount of space USED/FREE for the data file
  • The amount of remaining FREE SPACE for the drive that the file is on

Too many times we have a drive that is running out of storage and need to move tables/indexes to other files.  This query is a great starting point for identifying which files are in trouble.  It also gives us a birds eye view of other drives that may be candidates to move crowded tables to another drive.

Filegroups and Files
–drop table #sfs
–drop table #fixed_drives
–drop table #output_table
–drop table #databases
–drop table #dbf
–drop table #fg

— Save result set from showfilestats
CREATE TABLE #sfs(    fileid            tinyint
                    , filegroupid    tinyint
                    , totalextents    int
                    , usedextents    int
                    , dbfilename    sysname
                    , physfile        varchar(255) );
— Save result set from sys.database_files
CREATE TABLE #dbf(    [file_id]                int
                    , file_guid                uniqueidentifier
                    , [type]                tinyint
                    , type_desc                nvarchar(60)
                    , data_space_id            int
                    , [name]                sysname
                    , physical_name            nvarchar(260)
                    , [state]                tinyint
                    , state_desc            nvarchar(60)
                    , size                    int
                    , max_size                int
                    , growth                int
                    , is_media_ro            bit
                    , is_ro                    bit
                    , is_sparse                bit
                    , is_percent_growth        bit
                    , is_name_reserved        bit
                    , create_lsn            numeric(25, 0)
                    , drop_lsn                numeric(25, 0)
                    , read_only_lsn            numeric(25, 0)
                    , read_write_lsn        numeric(25, 0)
                    , diff_base_lsn            numeric(25, 0)
                    , diff_base_guid        uniqueidentifier
                    , diff_base_time        datetime
                    , redo_start_lsn        numeric(25, 0)
                    , redo_start_fork_guid    uniqueidentifier
                    , redo_target_lsn        numeric(25, 0)
                    , redo_target_fork_guid    uniqueidentifier
                    , back_lsn                numeric(25, 0) );
— Save result set from sys.filegroups select * from sys.filegroups
CREATE TABLE #fg(    [name]                sysname
                    , data_space_id        int
                    , [type]            char(2)
                    , type_desc            nvarchar(60)
                    , is_default        bit
                    , [filegroup_id]    uniqueidentifier
                    , log_filegroup_id    int
                    , is_read_only        bit );
— Populate #disk_free_space with data
CREATE TABLE #fixed_drives(DriveLetter    char(1) NOT NULL
                            , FreeMB    int NOT NULL );

INSERT INTO #fixed_drives
    EXEC master..xp_fixeddrives;
CREATE TABLE #output_table(DatabaseName    sysname
                            , FG_Name        sysname
                            , GB_Allocated    numeric(8, 2)
                            , GB_Used        numeric(8, 2)
                            , GB_Available    numeric(8, 2)
                            , DBFilename    sysname
                            , PhysicalFile    sysname
                            , Free_GB_on_Drive    numeric(8, 2) );
SELECT    name AS DBName
INTO    #databases
FROM    sys.databases
WHERE    database_id > 4
AND        state_desc = ‘ONLINE’;

DECLARE    @dbname    sysname;

SELECT    @dbname =(    SELECT    TOP (1) DBName FROM    #databases);
DELETE FROM #databases WHERE DBName = @dbname;


    — Get the file group data
    INSERT INTO #sfs            
        EXEC(‘USE ‘+ @dbname + ‘; DBCC showfilestats;’);
    INSERT INTO #dbf
        EXEC(‘USE ‘+ @dbname + ‘; SELECT * FROM sys.database_files;’);
        EXEC(‘USE ‘+ @dbname + ‘; SELECT * FROM sys.filegroups;’);
    — Wrap it up!
    INSERT INTO #output_table    (DatabaseName
                                , FG_Name
                                , GB_Allocated
                                , GB_Used
                                , GB_Available
                                , DBFilename
                                , PhysicalFile
                                , Free_GB_on_Drive )
        SELECT    @dbname AS DATABASE_NAME
                , AS [File Group Name]
                , CAST(((sfs.totalextents * 64.0) / 1024000.0) AS numeric(8, 2)) AS GB_Allocated
                , CAST(((sfs.usedextents * 64.0) / 1024000.0) AS NUMERIC(8, 2)) AS GB_Used
                , CAST((((sfs.totalextents sfs.usedextents) * 64.0) / 1024000.0) AS NUMERIC(8, 2)) AS GB_Available
                , sfs.dbfilename
                , sfs.physfile
                , CAST((fd.FreeMB / 1000.0) AS NUMERIC(8, 2)) AS Free_GB_on_Drive
        FROM        #sfs sfs
                INNER JOIN #dbf dbf
                    ON    dbf.[file_id] = sfs.fileid
                INNER JOIN #fg fg
                    ON fg.data_space_id = sfs.filegroupid
                INNER JOIN #fixed_drives fd
                    ON    fd.DriveLetter = SUBSTRING(sfs.physfile, 1, 1);
    SELECT    @dbname =(    SELECT    TOP (1) DBName FROM    #databases);
    IF @dbname IS NOT NULL
        DELETE FROM #databases WHERE DBName = @dbname;

SELECT    CONVERT(int, CONVERT(char, current_timestamp, 112)) AS CaptureDate
        , DatabaseName
        , FG_Name
        , GB_Allocated
        , GB_Used
        , GB_Available
        , DBFilename
        , PhysicalFile
        , Free_GB_on_Drive
FROM    #output_table
ORDER BY DatabaseName
        , FG_Name


I’ll add the code for this to the downloads on the right side of this post…

Hopefully you’ll find this query useful for getting a detailed picture of how your databases are physically laid out.  Without this info it’s impossible to figure out how to reconfigure / redistribute your data.

Stay curious; keep learning…

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