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This returns: blocking_session_id wait_duration_ms session_id ------------------- -------------------- ---------52 158568 53 (1 row(s) affected) This query identified that session id "52" is blocking session "53." To see what session id 52 is doing, execute the following query in the same window as the previous query: DBCC INPUTBUFFER(52) This returns: EventType Parameters EventInfo -------------- ---------- ---------------------------------------------------------Language Event 0 BEGIN TRAN UPDATE Production.ProductInventory SET Quantity = 400 WHERE ProductID = 1 AND LocationID = 1 (1 row(s) affected) DBCC execution completed. If DBCC printed error messages, contact your system administrator. Next, to forcibly shut down the session, execute this query: KILL 52 This returns: Command(s) completed successfully. The second session s UPDATE is then allowed to proceed once the other session s connection is removed.

<!-- A list of flags that will be "evolved" by ACOVEA (85 for GCC 4.1!) --> <flags> <!-- O1 options (these turn off options implied by -O1) --> <flag type="simple" value="-fno-merge-constants" /> <flag type="simple" value="-fno-defer-pop" /> <flag type="simple" value="-fno-thread-jumps" /> <flag type="enum" value="-fno-omit-frame-pointer|-momit-leaf-frame-pointer" /> <flag type="simple" value="-fno-guess-branch-probability" /> <flag type="simple" value="-fno-cprop-registers" /> <flag type="simple" value="-fno-if-conversion" /> . . .. <!-- O2 options --> <flag type="simple" value="-fcrossjumping" /> <flag type="simple" value="-foptimize-sibling-calls" /> <flag type="simple" value="-fcse-follow-jumps" /> <flag type="simple" value="-fcse-skip-blocks" />

You can also increase the stroke width of a circle much like a rectangle: convert -size 100x100 -stroke red -strokewidth 5-fill lightblue -draw "circle 50,50 70,70" xc:white output.png This gives you the result shown in Figure 7-38.

The recipe demonstrated blocking by executing an UPDATE against the Production.ProductInventory table with a transaction that was opened but not committed. In a different session, a similar query was executed against the same table and the same row. Because the other connection s transaction never committed, the second connection must wait in line indefinitely before it has a chance to update the record. In a third Query Editor connection, the sys.dm_os_waiting_tasks dynamic management view was queried, returning information on the session being blocked by another session: blocking_session_id ------------------52 wait_duration_ms -------------------158568 session_id ---------53

<flag type="simple" value="-fgcse" /> <flag type="simple" value="-fexpensive-optimizations" /> <flag type="simple" value="-fstrength-reduce" /> <flag type="simple" value="-frerun-cse-after-loop" /> <flag type="simple" value="-frerun-loop-opt" /> <!-- O3 options --> <flag type="simple" value="-fgcse-after-reload" /> <flag type="simple" value="-finline-functions" /> <flag type="simple" value="-funswitch-loops" /> <!-- Additional options --> <flag type="simple" value="-ffloat-store" /> <flag type="simple" value="-fprefetch-loop-arrays" /> <flag type="simple" value="-fno-inline" /> <flag type="simple" value="-fpeel-loops" /> <!-- Tuning options that have a numeric value --> <flag type="tuning" value="-finline-limit" default="600" min="100" max="10000" step="100" separator="=" /> </flags> </acovea_config>

This query identified that session id 52 was blocking session 53. When troubleshooting blocks, you ll want to see exactly what the blocking spid is doing. To view this, the recipe used the DBCC INPUTBUFFER function, putting the blocking spid in parentheses. The DBCC INPUTBUFFER command was used to view the last statement sent by the client connection to SQL Server.

Acovea can be used with any of the GCC compilers by specifying the compiler that you want to run in the baseline element s command attribute in your Acovea configuration file.

Sometimes blocks pile up, and you must work your way through each blocked process up to the original blocking process using the blocking_session_id and session_id columns.

KILL was then used to forcibly end the blocking process, but in a production scenario, you ll want to see if the process is valid, and if so, whether it should be allowed to complete, or if it can be shut down using the application (by the application end-user, for example). Prior to stopping the process, be sure that you are not stopping a long-running transaction that is critical to the business, like a payroll update, for example. If there is no way to stop the transaction (for example, the application that spawned it cannot commit the transaction), you can use the KILL command (followed by the spid to terminate).

Once you have downloaded and optionally customized your configuration file, use the runacovea application to test GCC with the selected options, as in the following example: runacovea config config-file-name input source-file-name

When a transaction or statement is being blocked, this means it is waiting for a lock on a resource to be released. This recipe demonstrates the SET LOCK_TIMEOUT option, which specifies how long the blocked statement should wait for a lock to be released before returning an error. The syntax is as follows: SET LOCK_TIMEOUT timeout_period The timeout period is the number of milliseconds before a locking error will be returned. This example demonstrates setting up a lock timeout period of one second (1000 milliseconds): SET LOCK_TIMEOUT 1000 UPDATE Production.ProductInventory SET Quantity = 406 WHERE ProductID = 1 AND LocationID = 1

And finally, you can of course fill the circle: convert -size 100x100 -stroke red -strokewidth 5 -fill red -draw "circle 50,50 70,70" xc:white output.png This gives you the result shown in Figure 7-39.