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CHAPTER 6 LOCKING AND LATCHING
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The procedure, P, will now show up in the DBA_DDL_LOCKS view. We have a parse lock on it: ops$tkyte@ORA10G> select session_id sid, owner, name, type, 2 mode_held held, mode_requested request 3 from dba_ddl_locks 4 / SID ---161 161 161 ... 161 OWNER --------OPS$TKYTE SYS SYS SYS NAME --------------------P DBMS_UTILITY DBMS_UTILITY DBMS_OUTPUT TYPE -------------------Table/Procedure/Type Body Body HELD ---Null Null Null REQUEST --------None None None
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12 rows selected. We then recompile our procedure and query the view again: ops$tkyte@ORA10G> alter procedure p compile; Procedure altered. ops$tkyte@ORA10G> select session_id sid, owner, name, type, 2 mode_held held, mode_requested request 3 from dba_ddl_locks 4 / SID ---161 161 ... 161 OWNER --------SYS SYS SYS NAME --------------------DBMS_UTILITY DBMS_UTILITY DBMS_OUTPUT TYPE -------------------Body Body HELD ---Null Null REQUEST --------None None
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11 rows selected. We find that P is now missing from the view. Our parse lock has been broken. This view is useful to you, as a developer, when it is found that some piece of code won t compile in the test or development system it hangs and eventually times out. This indicates that someone else is using it (actually running it), and you can use this view to see who that might be. The same will happen with GRANTS and other types of DDL against the object. You cannot grant EXECUTE on a procedure that is running, for example. You can use the same method to discover the potential blockers and waiters.
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Latches are lightweight serialization devices used to coordinate multiuser access to shared data structures, objects, and files.
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Latches are locks designed to be held for extremely short periods of time for example, the time it takes to modify an in-memory data structure. They are used to protect certain memory structures, such as the database block buffer cache or the library cache in the Shared pool. Latches are typically requested internally in a willing to wait mode. This means that if the latch is not available, the requesting session will sleep for a short period of time and retry the operation later. Other latches may be requested in an immediate mode, which is similar in concept to a SELECT FOR UPDATE NOWAIT, meaning that the process will go do something else, such as try to grab an equivalent sibling latch that may be free, rather than sit and wait for this latch to become available. Since many requestors may be waiting for a latch at the same time, you may see some processes waiting longer than others. Latches are assigned rather randomly, based on the luck of the draw, if you will. Whichever session asks for a latch right after it was released will get it. There is no line of latch waiters just a mob of waiters constantly retrying. Oracle uses atomic instructions like test and set and compare and swap for operating on latches. Since the instructions to set and free latches are atomic, the operating system itself guarantees that only one process gets to test and set the latch even though many processes may be going for it simultaneously. Since the instruction is only one instruction, it can be quite fast. Latches are held for short periods of time and provide a mechanism for cleanup in case a latch holder dies abnormally while holding it. This cleanup process would be performed by PMON. Enqueues, which were discussed earlier, are another, more sophisticated serialization device used when updating rows in a database table, for example. They differ from latches in that they allow the requestor to queue up and wait for the resource. With a latch request, the requestor session is told right away whether or not it got the latch. With an enqueue lock, the requestor session will be blocked until it can actually attain it.
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