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NAS_TRANSACTION_LOG table growing indefinitely - How to clean data from NAS table

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Article ID: 100991

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Updated On:

Products

DX Unified Infrastructure Management (Nimsoft / UIM)

Issue/Introduction

NAS_TRANSACTION_LOG table (in CA UIM database) keeps growing indefinitely.

Errors in nas probe log.

nas: COM Error [0x80040e31] IDispatch error #3121 - [Microsoft OLE DB Provider for SQL Server] Query timeout expired
nas: Nis-Bridge: Transaction-log administration, failed to remove transaction entries older than X days.
nas: Nis-Bridge: Transaction-log administration, failed to compress transaction entries older than X days.

Cause

DELETE statement timed out.
The nas probe executes DELETE statement via Microsoft OLE DB Provider (a.k.a ADO), which has 30 seconds timeout.
The timeout occurs if the NAS_TRANSACTION_LOG table is quite large.

Environment

- CA UIM on Windows
- Microsoft SQL Server as UIM database.

Resolution

Quick Resolution:

Open NAS probe GUI. Go to [Setup] - [NiS Bridge] tab.

Take memo of each configured values for the below parameters.

[Compress transactions after]     X days 
[Keep transaction history]           Y days 
[Keep transaction summary]       Z days

1. Deactivate ems probe and nas probe.

2. Please execute the below SQL for UIM database
---------------------------------------------------------------------------------------------------------------------------------------------------------
DELETE FROM NAS_TRANSACTION_LOG WHERE TIME < DATEADD(dd,-X,getdate()) AND type IN (2,16) 
DELETE FROM NAS_TRANSACTION_LOG WHERE TIME < DATEADD(dd,-Y,getdate()) 
DELETE FROM NAS_TRANSACTION_SUMMARY WHERE TIME < DATEADD(dd,-Z,getdate()) 
---------------------------------------------------------------------------------------------------------------------------------------------------------
 
3. Activate nas probe and ems probe (in case of UIM server is 8.5.1)

 

Permanent Resolution:

Open NAS probe with RAW CONFIGURE.
Add the following keys under <setup> section in NAS.cfg

nis_trans_admin = XXXX (default 3600 - seconds)
nis_trans_delete_incremental=yes (default no)
nis_trans_delete_size=YYYYY (default 10000 - number)

NAS probe runs the DELETE statement with interval of "nis_trans_admin" value.

If "nis_trans_delete_incremental" is enabled, DELETE statement will target number of rows specified in "nis_trans_delete_size" only.
DELETE statement will look like this.

DELETE top (nis_trans_delete_size) FROM NAS_TRANSACTION_LOG WHERE TIME <= 'XX'

With this feature, because one DELETE statement may not sufficient to cover all the old data, we may need to run the DELETE multiple times.
Therefore, "nis_trans_admin" have to be smaller value which helps you to see Administration task run multiple times within an hour.

In this below example, NAS runs the Administration task in every 5 minutes. One task does not remove more than 1000 rows.
However it runs 12 times in an hour. In total, you can remove 12000 rows in an hour. (12000 rows removal at one time might not finish within 30 seconds.)

nis_trans_admin = 300
nis_trans_delete_incremental=yes
nis_trans_delete_size=1000

Additional Information

The described step as Permanent Solution in this document affecting only NAS_TRANSACTION_LOG table.

The solution can be validated from time to time using the following queries:

select top(10) * FROM NAS_TRANSACTION_LOG WHERE TIME < DATEADD(dd,-X,getdate()) AND type IN (2,16) order by time asc
select top(10) * FROM NAS_TRANSACTION_LOG WHERE TIME < DATEADD(dd,-Y,getdate()) order by time asc
select top(10) * FROM NAS_TRANSACTION_SUMMARY WHERE TIME < DATEADD(dd,-Z,getdate()) order by time asc