Deadlock key how to#
Deadlock key update#
Deadlock key full#

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Deadlock key full#

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Result: In 11g Session1 blocks Session2 but in 9i/10g this does not occur.ĭatabase was upgraded to 11g Cause Sign In

Deadlock key update#

Session 2: update table2 (table2 has a foreign key column reference to table1) Session 1: insert into table1 (no commit) Involved tables have foreign key constraints that are unindexed.ORA-00060 Deadlock occurs on 11g, but not in 10g/9i.

Information in this document applies to any platform. Oracle Database Backup Service - Version N/A and later Oracle Cloud Infrastructure - Database Service - Version N/A and later Oracle Database Exadata Cloud Machine - Version N/A and later Oracle Database Cloud Schema Service - Version N/A and later Oracle Database - Enterprise Edition - Version 11.2.0.1 and later If your query was trying to lock a row in an an index and was blocked, you get a totally different style of address.ORA-00060 Deadlock Due to Missing Indexes on Foreign Key Constraints Occurs in Oracle 11g R2 But Not in 10g What if you were waiting on a KEY? Key lock waits Example 2: waitresource=“KEY: 6:72057594041991168 (ce52f92a058c)” = Database_Id, HOBT_Id ( Magic hash that you can decode with %%lockres%% if you really want) That’s enough detail on waitresource=PAGE. I’ve added NOLOCK to the query because while we want a glance at this info, we have no guarantee that it’s the way it was earlier when the blocking happened anyway– we’re guessing, so we may as well do dirty reads.īut woo hoo, it gives me a clean display of the 25 rows which the query was fighting for:

Like I said, this is slow even on tiny tables. Buy Atlantic Elite 3 3 Lever Key Deadlock Satin Brass by Atlantic Handles from our Accessories range - Dead Lock, Brass - Buying any type of door made. WHERE sys.fn_PhysLocFormatter ( %%physloc %%) like '(3:70133%' GO Now that we know that the page lock wait was on Sales.OrderLines, we can see all the data in that table on data file = 3 and page number = 70133 with this query: You can use %%physloc%% with sys.fn_PhysLocFormatter in SQL Server 2008 and higher. %%physloc%% is an undocumented piece of magic that will return the physical record locator for every row. But it’s kinda fun, so… since you read this far… let’s talk about %%physloc%%! 1.4) Can I see the data on the page that was locked?

But you have to query all the pages in the database, which seems not as awesome against large databases – so I listed the DBCC page method. Note: In SQL Server 2014 and higher, you could also find the object name using the undocumented sys.dm_db_database_page_allocations dynamic management object. So.object_id = 94623380 and si.index_id = 1 Īnd behold, this lock wait was on the PK_Sales_OrderLines index on the Sales.OrderLines table. If your query was waiting on a page level lock, SQL Server gives you the page address.īreaking “PAGE: 6:3:70133” down, we’ve got: Page lock waits Example 1: waitresource=“PAGE: 6:3:70133 ' = Database_Id : FileId : PageNumber

Deadlock key how to#

Here’s a reference on how to decode them.Īll of this information is out there on the internet already in various places, it’s just spread out! I’m going to pull the whole thing together, from DBCC PAGE to hobt_id to the undocumented %%physloc%% and %%lockres%% functions.įirst we’ll talk through PAGE lock waits, then we’ll hit the KEY lock waits. Sometimes there’s more information in the massive monster of XML that you’re scanning through (deadlock graphs have a resource list that help reveal the object and index name), but sometimes there isn’t. If you use SQL Server’s blocked process report or collect deadlock graphs, occasionally you’ll come across things that look like this: