BI SQL # 267 : SQL Server DBA Scripts : Identity Columns: Are You Nearing The Limits?

Hi Folks,

In this article we are going to cover Identity Columns: Are You Nearing The Limits?.

In this post we are going to discuss following points:

• Problem Statement of SQL Script:
• Description of SQL Script:
• SQL Script Output Column
• SQL Script Code
• SQL Script Output Screenshot
• User Level to execute

Problem Statement of SQL Script:

How to find all the identity column in a table and how much percent is left for Limit?

Description of SQL Script:

This script will gives all the identity column in a table and how much percent is left for Limit.

SQL Script Output Column

SQL Script Code

DECLARE @threshold DECIMAL(3, 2) = .85;

/* Create a temp table */
CREATE TABLE #identityStatus (
    database_name VARCHAR(128)
    ,table_name VARCHAR(128)
    ,column_name VARCHAR(128)
    ,data_type VARCHAR(128)
    ,last_value BIGINT
    ,max_value BIGINT
    );

/* Use an undocumented command to run a SQL statement
   in each database on a server */
EXECUTE sp_msforeachdb 
    '
    Use [?];
    Insert Into #identityStatus
    Select ''?'' As [database_name]
        , Object_Name(id.object_id, DB_ID(''?'')) As [table_name]
        , id.name As [column_name]
        , t.name As [data_type]
        , Cast(id.last_value As bigint) As [last_value]
        , Case 
            When t.name = ''tinyint''   Then 255 
            When t.name = ''smallint''  Then 32767 
            When t.name = ''int''       Then 2147483647 
            When t.name = ''bigint''    Then 9223372036854775807
          End As [max_value]
    From sys.identity_columns As id
    Join sys.types As t
        On id.system_type_id = t.system_type_id
    Where id.last_value Is Not Null'
    ;

/* Retrieve our results and format it all prettily */
SELECT database_name
    ,table_name
    ,column_name
    ,data_type
    ,last_value
    ,CASE 
        WHEN last_value < 0
            THEN 100
        ELSE (1 - Cast(last_value AS FLOAT(4)) / max_value
                ) * 100
        END AS [percentLeft]
    ,CASE 
        WHEN Cast(last_value AS FLOAT(4)) / max_value >= @threshold
            THEN 'warning: approaching max limit'
        ELSE 'okay'
        END AS [id_status]
FROM #identityStatus
ORDER BY percentLeft;

/* Clean up after ourselves */
DROP TABLE #identityStatus;

SQL Script Output Screenshot

User Level to execute

300

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