Verifying data_engine is deleting old raw and historic data properly

Products

• DX Unified Infrastructure Management (Nimsoft / UIM)
• CA Unified Infrastructure Management On-Premise (Nimsoft / UIM)
• CA Unified Infrastructure Management SaaS (Nimsoft / UIM)

Issue/Introduction

How can we verify that the data_engine is deleting old raw and historic data properly from the database?

Environment

Release:  UIM 9.x or later

Resolution

1. Access your SQL server's desktop
   Log into a SQL Management Studio console
   Select the appropriate database from the dropdown in the toolbar.  This will usually be NimsoftSLM for older installations or CA_UIM for newer.
   Paste the following query into a New Query window and click the Execute button

   /****** Script for finding old data which the data_engine failed to summarize ******/ 

   DECLARE @sql NVARCHAR(256),@tbl_char VARCHAR(4),@count INT,@count_out INT,@index INT = 1,@tbl_num INT,@raw_days INT,@hist_days INT,@daily_days INT,@rows_found TINYINT = 0,@rows_out NVARCHAR(128),@params NVARCHAR(256) = N'@rowcountOUT INT, @count_out INT OUTPUT'; 

   SET @raw_days = (SELECT RawAge FROM tbn_de_DataMaintConfig) + 2; -- Days where the data_engine should delete raw data 

   SET @hist_days = (SELECT HistoryAge FROM tbn_de_DataMaintConfig) + 2; -- Days where the data_engine should delete hourly data 

   SET @daily_days = (SELECT DailyAvgAge FROM tbn_de_DataMaintConfig) + 2; -- Days where the data_engine should delete daily data
    

   -- Set @tbl_num to be the number of raw tables (a count of the S_QOS_DEFINTION table) 

   SET @sql = N'SELECT @count_out = COUNT(*) FROM S_QOS_DEFINITION'; 

   EXEC sys.sp_executesql @sql, @params, @rowcountOUT = @count, @count_out = @rows_out OUTPUT; 

   SET @tbl_num = CAST(@rows_out AS INT);
    

   -- Search the RN tables for data that should have been removed 

   WHILE (@index <= @tbl_num) BEGIN 

   SET @tbl_char = RIGHT('0000' + CONVERT(VARCHAR(4), @index), 4); 

   SET @sql = N'SELECT @count_out = COUNT(*) FROM RN_QOS_DATA_' + @tbl_char + ' WHERE sampletime < (GETDATE() - ' + CAST(@raw_days AS VARCHAR(5)) + ')';
    

   -- Make sure the table exists before running SQL against it ...

    IF EXISTS(SELECT name FROM sysobjects WHERE name = N'RN_QOS_DATA_'+ @tbl_char and xtype ='U') 

   EXEC sys.sp_executesql @sql, @params, @rowcountOUT = @count, @count_out = @rows_out OUTPUT;
    

   -- Print the output of old raw data

    IF (CAST(@rows_out AS INT) > 0) BEGIN 

   PRINT 'RN_QOS_DATA_' + @tbl_char + ' contains ' + @rows_out + ' samples which are older than ' + CAST(@raw_days AS VARCHAR(4)) + ' days old.'; 

   SET @rows_found = 1; 

   END 

   SET @index = @index + 2; 

   END 

   IF (@rows_found = 0)

   PRINT 'No unmaintained data found in RN tables';
   
   -- Reset our index variable to traverse HN tables 

   SET @index = 1; 

   SET @rows_found = 0;
    

   -- Search the HN tables for data that should have been removed 

   WHILE (@index <= @tbl_num) BEGIN 

   SET @tbl_char = RIGHT('0000' + CONVERT(VARCHAR(4), @index), 4); 

   SET @sql = N'SELECT @count_out = COUNT(*) FROM [HN_QOS_DATA_' + @tbl_char + '] WHERE sampletime < (GETDATE() - ' + CAST(@hist_days AS VARCHAR(5)) + ')';
    

   -- Make sure the table exists before running SQL against it ... 

   IF EXISTS(SELECT name FROM sysobjects WHERE name = N'HN_QOS_DATA_' + @tbl_char and xtype = 'U') 

   EXEC sys.sp_executesql @sql, @params, @rowcountOUT = @count, @count_out = @rows_out OUTPUT; 

   
   -- Print the output of old historic data 

   IF (CAST(@rows_out AS INT) > 0) BEGIN 

   PRINT 'HN_QOS_DATA_' + @tbl_char + ' contains ' + @rows_out + ' samples which are older than ' + CAST(@hist_days AS VARCHAR(4)) + ' days old.'; 

   SET @rows_found = 1; 

   END 

   SET @index = @index + 2; 

   END 

   IF (@rows_found = 0) 

   PRINT 'No unmaintained data found in HN tables'; 

   -- Reset our index variable to traverse DN tables 

   SET @index = 1; 

   SET @rows_found = 0;
    

   -- Search the DN tables for data that should have been removed 

   WHILE (@index <= @tbl_num) BEGIN 

   SET @tbl_char = RIGHT('0000' + CONVERT(VARCHAR(4), @index), 4); 

   SET @sql = N'SELECT @count_out = COUNT(*) FROM [DN_QOS_DATA_' + @tbl_char + '] WHERE sampletime < (GETDATE() - ' + CAST(@daily_days AS VARCHAR(5)) + ')';
    

   -- Make sure the table exists before running SQL against it ... 

   IF EXISTS(SELECT name FROM sysobjects WHERE name = N'DN_QOS_DATA_' + @tbl_char and xtype = 'U') 

   EXEC sys.sp_executesql @sql, @params, @rowcountOUT = @count, @count_out = @rows_out OUTPUT;
    

   -- Print the output of old historic data 

   IF (CAST(@rows_out AS INT) > 0) BEGIN 

   PRINT 'DN_QOS_DATA_' + @tbl_char + ' contains ' + @rows_out + ' samples which are older than ' + CAST(@hist_days AS VARCHAR(4)) + ' days old.'; 

   SET @rows_found = 1; 

   END 

   SET @index = @index + 2;

   END 

   IF (@rows_found = 0) 

   PRINT 'No unmaintained data found in DN tables'; 

   /****** End SQL Script ******/
    

   If the output from the script shows as follows then data_engine is honoring the retention policies configured in data_engine:

No unmaintained data found in RN tables

No unmaintained data found in HN tables

No unmaintained data found in DN tables

If, however you receive output that looks like the following, then a support case may need to be opened to fix the issue

        RN_QOS_DATA_0001 contains 416 samples which are older than 30 days old.

        RN_QOS_DATA_0007 contains 2524 samples which are older than 30 days old.

        RN_QOS_DATA_0008 contains 415 samples which are older than 30 days old.
 

Please also note that this query can take 10 - 15 minutes or more to run on a large database.

Additional Information

If you have configured some QoS in your environment to have a different (non-default) retention period the above script will not return accurate results.

If that is the case please use the below version:

--

DECLARE @sql NVARCHAR(256),@tbl_char VARCHAR(256),@count INT,@count_out INT,@index INT = 1,@tbl_num INT,@craw int, @chist int, @cday int,@rows_found TINYINT = 0,@rows_out NVARCHAR(128),@params NVARCHAR(256) = N'@rowcountOUT INT, @count_out INT OUTPUT';
 
-- Set @tbl_num to be the number of raw tables (a count of the S_QOS_DEFINTION table)
SET @sql = N'SELECT @count_out = COUNT(*) FROM S_QOS_DEFINITION';
EXEC sys.sp_executesql @sql, @params, @rowcountOUT = @count, @count_out = @rows_out OUTPUT;
SET @tbl_num = CAST(@rows_out AS INT);
 
-- Search the RN tables for data that should have been removed
WHILE (@index <= @tbl_num) BEGIN
 SET @tbl_char = 'RN_QOS_DATA_' +  RIGHT('0000' + CONVERT(VARCHAR(4), @index), 4);
 
 -- Make sure the table exists before running SQL against it ...
 IF EXISTS(SELECT name FROM sysobjects WHERE name = @tbl_char and xtype ='U') BEGIN
 SET @craw = ( SELECT isnull((select raw_age from s_qos_definition where r_table = @tbl_char), (SELECT RawAge FROM tbn_de_DataMaintConfig)) + 2 )
 SET @sql = N'SELECT @count_out = COUNT(*) FROM [' + @tbl_char + '] WHERE sampletime < (GETDATE() - ' + CAST(@craw AS VARCHAR(5)) + ')';
 EXEC sys.sp_executesql @sql, @params, @rowcountOUT = @count, @count_out = @rows_out OUTPUT;
 
 -- Print the output of old raw data 
 IF (CAST(@rows_out AS INT) > 0) BEGIN
 PRINT @tbl_char + ' contains ' + @rows_out + ' samples which are older than ' + CAST(@craw AS VARCHAR(4)) + ' days old.';
 SET @rows_found = 1;
 END
 END
 
 SET @index = @index + 2;
END
 
IF (@rows_found = 0)
 PRINT 'No unmaintained data found in RN tables';
 
-- Reset our index variable to traverse HN tables
SET @index = 1;
SET @rows_found = 0;
 
-- Search the HN tables for data that should have been removed
 
WHILE (@index <= @tbl_num) BEGIN
 SET @tbl_char = 'HN_QOS_DATA_' + RIGHT('0000' + CONVERT(VARCHAR(4), @index), 4);
 -- Make sure the table exists before running SQL against it ...
 IF EXISTS(SELECT name FROM sysobjects WHERE name = @tbl_char and xtype = 'U') BEGIN
 SET @chist = ( SELECT isnull((select history_age from s_qos_definition where h_table = @tbl_char), (SELECT HistoryAge FROM tbn_de_DataMaintConfig)) + 2 ) 
 SET @sql = N'SELECT @count_out = COUNT(*) FROM [' + @tbl_char + '] WHERE sampletime < (GETDATE() - ' + CAST(@chist AS VARCHAR(5)) + ')';
 
 EXEC sys.sp_executesql @sql, @params, @rowcountOUT = @count, @count_out = @rows_out OUTPUT;
 
 -- Print the output of old historic data
 
 IF (CAST(@rows_out AS INT) > 0) BEGIN
 PRINT @tbl_char + ' contains ' + @rows_out + ' samples which are older than ' + CAST(@chist AS VARCHAR(4)) + ' days old.';
 SET @rows_found = 1;
 END
 END
 
 SET @index = @index + 2;
END
 
IF (@rows_found = 0)
 PRINT 'No unmaintained data found in HN tables';
 
-- Reset our index variable to traverse DN tables
SET @index = 1;
SET @rows_found = 0;
 
-- Search the DN tables for data that should have been removed
WHILE (@index <= @tbl_num) BEGIN
 SET @tbl_char = 'DN_QOS_DATA_' + RIGHT('0000' + CONVERT(VARCHAR(4), @index), 4);
 -- Make sure the table exists before running SQL against it ...
 IF EXISTS(SELECT name FROM sysobjects WHERE name = @tbl_char and xtype = 'U') BEGIN
 SET @cday = ( SELECT isnull((select dailyavg_age from s_qos_definition where d_table = @tbl_char), (SELECT DailyAvgAge FROM tbn_de_DataMaintConfig)) + 2 )
 SET @sql = N'SELECT @count_out = COUNT(*) FROM [' + @tbl_char + '] WHERE sampletime < (GETDATE() - ' + CAST(@cday AS VARCHAR(5)) + ')';
 
 EXEC sys.sp_executesql @sql, @params, @rowcountOUT = @count, @count_out = @rows_out OUTPUT;
 
 -- Print the output of old historic data
 IF (CAST(@rows_out AS INT) > 0) BEGIN
 PRINT @tbl_char + ' contains ' + @rows_out + ' samples which are older than ' + CAST(@cday AS VARCHAR(4)) + ' days old.';
 SET @rows_found = 1;
 END
 END
 
 SET @index = @index + 2;
END
 
IF (@rows_found = 0)
 PRINT 'No unmaintained data found in DN tables';
 
--