Truncate Log Problems

Mar 9, 2000

I am running a simple scheduled task each night before backup to truncate our tran log.
DUMP Transaction psychtest with TRUNCATE_ONLY
the task runs, however when checking the log space available after, it isnt changing.
Is this a reporting error? or is the log not being purged?
Ive tried running dbcc checktable(syslogs) after the truncate with no luck.
thanks,
scott

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'Truncate' Command Doesn't Truncate Enough

Dec 30, 2004

With a database size of almost 2 GB, I run the 'truncate table eventlog command' which completes successfully, but the database size only decreases by about 10 MB so stays too large - indeed the number of rows in the eventlog table is minimal, but the otehr tables in this database don't show such an amount of tables large enough to cause the size issue either. What could be the reason and how can I reduce it (possibly truncating another table but then which one, how could I determine which is too large and needs truncating?).

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To Truncate Or Not To Truncate: That Is The Question..

Apr 17, 2008

Hi all...

Please forgive the elementary nature of my question, but could someone please explain the differences between these two database backup types:

1. Log backup
2. Log backup no truncate



From what I understand and have read, the "no truncate" backup method keeps the entire transaction log indefinitely. Using the truncation method, the transaction log is either 1) compressed or 2) cleaned up so that any completed transactions are removed from the log. Which one of these is true?


And, for the big question: is it better to run a backup of the transaction log with truncation or not? Our current backup scheme is similar to the following:


Full backup every 24 hours
transaction log backup every hour with no truncation


Should we insert a truncation backup somewhere in here? What is the danger of removing (or compressing) parts of the transaction log? Will this affect the restore process?


Thanks in advance!

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Aug 1, 2007

i read that i can Truncate a table even if child table has no records so i tries to disable constraints but still can't get it to workCannot truncate table 'InventoryPC' because it is being referenced by a FOREIGN KEY constraint. disabling code on lines 9-13 and enabling codes on 36-40 1 ALTER PROCEDURE dbo.RevertDB
2
3 /* Reverts Database to original "Clean" State */
4 AS
5 SET NOCOUNT OFF
6 DECLARE @Log AS varchar(MAX), @RowsInDB AS int
7 SET @Log = 'RevertDB Started at ' + CAST(GETDATE() AS varchar(50)) + ''
8
9 /* *** Disable Constraints *** */
10 ALTER TABLE Booking NOCHECK CONSTRAINT ALL
11 ALTER TABLE InventoryPC NOCHECK CONSTRAINT ALL
12 ALTER TABLE PC NOCHECK CONSTRAINT ALL
13 ALTER TABLE Platform NOCHECK CONSTRAINT ALL
14
15 /* *** Start Truncates *** */
16 TRUNCATE TABLE Booking
17 SET @Log = @Log + 'Trucate Table Booking - Done' + ''
18 SET @RowsInDB = (SELECT COUNT(BookingID) FROM Booking)
19 SET @Log = @Log + '-- Rows Affected: ' + CAST(@@ROWCOUNT AS varchar(10)) + ', Rows in Table: ' + CAST(@RowsInDB AS varchar(10)) + ''
20
21 TRUNCATE TABLE InventoryPC
22 SET @Log = @Log + 'Trucate Table InventoryPC - Done' + ''
23 SET @RowsInDB = (SELECT COUNT(InventoryID) FROM InventoryPC)
24 SET @Log = @Log + '-- Rows Affected: ' + CAST(@@ROWCOUNT AS varchar(10)) + ', Rows in Table: ' + CAST(@RowsInDB AS varchar(10)) + ''
25
26 TRUNCATE TABLE PC
27 SET @Log = @Log + 'Trucate Table PC - Done' + ''
28 SET @RowsInDB = (SELECT COUNT(PCID) FROM PC)
29 SET @Log = @Log + '-- Rows Affected: ' + CAST(@@ROWCOUNT AS varchar(10)) + ', Rows in Table: ' + CAST(@RowsInDB AS varchar(10)) + ''
30
31 TRUNCATE TABLE Platform
32 SET @Log = @Log + 'Trucate Table Platform - Done' + ''
33 SET @RowsInDB = (SELECT COUNT(PlatformID) FROM Platform)
34 SET @Log = @Log + '-- Rows Affected: ' + CAST(@@ROWCOUNT AS varchar) + ', Rows in Table: ' + CAST(@RowsInDB AS varchar(10)) + ''
35
36 /* *** Enable Constraints *** */
37 ALTER TABLE Booking WITH CHECK CHECK CONSTRAINT ALL
38 ALTER TABLE InventoryPC WITH CHECK CHECK CONSTRAINT ALL
39 ALTER TABLE PC WITH CHECK CHECK CONSTRAINT ALL
40 ALTER TABLE Platform WITH CHECK CHECK CONSTRAINT ALL
41
42 SET @Log = @Log + '*** End Truncates ***' + ''
43 /* *** End Truncates *** */
44
45 /* *** Start Insert Platform *** */
46 SET @Log = @Log + 'Start Insert Platform' + ''
47
48 EXEC dbo.InsertPlatform 'Windows XP SP2 Professional Edition', 'Some description for Windows XP SP2 Professional Edition over here …'
49 EXEC dbo.InsertPlatform 'Windows Vista Ultimate', 'See everything you''re working on more clearly with Windows Aero, and quickly switch between windows or tasks using Windows Flip 3D and Live Thumbnails. You can easily find what you need—when you need it―with Instant Search and live icon previews that display the actual contents of your files. And while you''re at it, give your personal productivity a boost with instant access to the information you care about using Windows Sidebar and Gadgets. Put these easy-to-use and customizable mini-applications on your desktop and reveal the information you''re looking for at a glance.Website: http://www.microsoft.com/windows/products/windowsvista/seeit/default.mspx'
50 EXEC dbo.InsertPlatform 'Apple Mac OS X Tiger', 'Some description for Apple Mac OS X Tiger over here …'
51 EXEC dbo.InsertPlatform 'Apple Mac OS X Leopard', 'Desktop: The new look of Leopard showcases your favorite desktop image and puts new file Stacks at your fingertips for a stunning, clutter-free workspace.Finder: Browse your files like you browse your music with Cover Flow.Time Machine: See how your system looked on any given day and restore files with aWebsite: http://www.apple.com/macosx/leopard/features/'
52 EXEC dbo.InsertPlatform 'Red Hat Linux', 'Some description for Red Hat Linux over here …'
53
54 SET @Log = @Log + 'Rows In Platform: ' + (SELECT COUNT(PlatformID) FROM Platform) + ''
55 /* *** Start Insert PC *** */
56 SET @Log = @Log + 'Start Insert PC' + ''
57
58 DECLARE @WinXP int, @WinVista int, @OSXTiger int, @OSXLeopard int, @RedHat int
59 SET @WinXP = (SELECT PlatformID FROM Platform WHERE Title = 'Windows XP SP2 Professional Edition')
60 SET @WinVista = (SELECT PlatformID FROM Platform WHERE Title = 'Windows Vista Ultimate')
61 SET @OSXTiger = (SELECT PlatformID FROM Platform WHERE Title = 'Apple Mac OS X Tiger')
62 SET @OSXLeopard = (SELECT PlatformID FROM Platform WHERE Title = 'Apple Mac OS X Leopard')
63 SET @RedHat = (SELECT PlatformID FROM Platform WHERE Title = 'Red Hat Linux')
64
65 EXEC dbo.InsertPC 'Fusion PC One', 'Description here ...', 'Intel Core2 Duo E6600 2.4 GHz 1066MHz', '1GB Dual Channel DDR2 667 SDRAM', '120GB SATA2 NCQ HDD', 'NVIDIA GeForce 8600 256MB GDDR3', '22" 3000:1 Wide Screen LCD', @WinXP
66 EXEC dbo.InsertPC 'Fusion PC Two', 'Description here ...', 'Intel Core2 Duo E6850 3 GHz 1333MHz', '2GB Dual Channel DDR2 800 SDRAM', '240GB SATA2 NCQ HDD', 'NVIDIA GeForce 8800 Ultra 256MB GDDR3 SLI', '24" 3000:1 Wide Screen LCD', @WinVista
67 EXEC dbo.InsertPC 'Fusion PC Three', 'Description here ...', 'AMD Athlon 64 X2 Dual Core 6000+ 3 GHz', '2GB Dual Channel DDR2 667 SDRAM', '240GB SATA2 NCQ HDD', 'ATI Radeon Cross Fire 2900 256MB GDDR3', '24" 3000:1 Wide Screen LCD', @WinVista
68 EXEC dbo.InsertPC 'Fusion X1', 'Description here ...', 'Intel Core2 Extreme Q6850 3 GHz 1333MHz', '6GB Dual Channel DDR2 800 SDRAM', '500GB SATA2 NCQ HDD', 'NVIDIA GeForce 8800 Ultra 256MB GDDR3 SLI', '30" 3000:1 Wide Screen LCD', @OSXLeopard
69 EXEC dbo.InsertPC 'Fusion X2', 'Description here ...', 'AMD Athlon 64 FX 74 3 GHz', '6GB Dual Channel DDR2 800 SDRAM', '500GB SATA2 NCQ HDD', 'NVIDIA GeForce 8900 Ultra SLI 256MB GDDR3', '30" 3000:1 Wide Screen LCD', @WinVista
70 EXEC dbo.InsertPC 'Fusion Tiger 1', 'Description here ...', 'Intel Core2 Duo E6600 2.4 GHz 1066MHz', '2GB Dual Channel DDR2 800 SDRAM', '120GB SATA2 NCQ HDD', 'NVIDIA GeForce 8600 256MB GDDR3 SLI', '22" 3000:1 Wide Screen LCD', @OSXTiger
71 EXEC dbo.InsertPC 'Fusion Linux 1', 'Description here ...', 'AMD Athlon 64 X2 6000+ 3 GHz', '1GB Dual Channel DDR2 800 SDRAM', '120GB SATA2 NCQ HDD', 'NVIDIA GeForce 8600 256MB GDDR3', '22" 3000:1 Wide Screen LCD', @RedHat
72
73 SET @Log = @Log + 'Rows In PC: ' + (SELECT COUNT(PCID) FROM PC) + ''
74
75 /* *** Start Insert Inventory *** */
76 SET @Log = @Log + 'Start Insert Inventory' + ''
77
78 DECLARE @F1 int, @F2 int, @F3 int, @FX1 int, @FX2 int, @FT1 int, @FR1 int
79 SET @F1 = (SELECT PCID FROM PC WHERE Title = 'Fusion PC One')
80 SET @F2 = (SELECT PCID FROM PC WHERE Title = 'Fusion PC Two')
81 SET @F3 = (SELECT PCID FROM PC WHERE Title = 'Fusion PC Three')
82 SET @FX1 = (SELECT PCID FROM PC WHERE Title = 'Fusion X1')
83 SET @FX2 = (SELECT PCID FROM PC WHERE Title = 'Fusion X2')
84 SET @FT1 = (SELECT PCID FROM PC WHERE Title = 'Fusion Tiger One')
85 SET @FR1 = (SELECT PCID FROM PC WHERE Title = 'Fusion Linux One')
86
87 EXEC dbo.InsertInventory 10, @F1, 2.5, 'iCluster Fusion One'
88 EXEC dbo.InsertInventory 10, @F2, 2.5, 'iCluster Fusion Two'
89 EXEC dbo.InsertInventory 10, @F3, 2.5, 'iCluster Fusion Three'
90 EXEC dbo.InsertInventory 6, @FX1, 6, 'iCluster Fusion X1'
91 EXEC dbo.InsertInventory 6, @FX2, 6, 'iCluster Fusion X2'
92 EXEC dbo.InsertInventory 10, @FT1, 3, 'iCluster Fusion Tiger One'
93 EXEC dbo.InsertInventory 30, @FR1, 2, 'iCluster Fusion Linux One'
94
95 SET @Log = @Log + 'Rows In Inventory: ' + (SELECT COUNT(InventoryID) FROM InventoryPC) + ''
96
97 RETURN @Log
98
   

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