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tasked with reading the PROCESSED_FLAG='N' records, performing some small, fast transaction and updating the PROCESSED_FLAG='N' to 'Y'. If it commits but that commit is later undone (by a system failure), it is OK because the application that processes these records will just process the record again it is restartable. If you look at these application categories, you ll notice that all three of them are background, noninteractive applications. They do not interact with a human being directly. Any application that does interact with a person, that reports to the person commit complete, should use the synchronous commit. Asynchronous commits are not a tuning device for your online customer-facing applications. Asynchronous commits are applicable only to batch-oriented applications, those that are automatically restartable upon failure. Interactive applications are not restartable automatically upon failure a human being must redo the transaction. Therefore, you have another flag that tells you whether this capability can be considered do you have a batch application or an interactive one Unless it is batchoriented, synchronous commit is the way to go. So, outside of those three categories of batch applications, this new capability COMMIT WRITE NOWAIT should probably not be used. If you do use it, you need to ask yourself what would happen if your application is told commit processed, but later, the commit is undone. You need to be able to answer that question and come to the conclusion that it will be OK if that happens. If you can t answer that question, or if a committed change being lost would have serious repercussions, you should not use the asynchronous commit capability.
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COMMITS in a Non-Distributed PL/SQL Block
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Since PL/SQL was first introduced in version 6 of Oracle, it has been transparently using an asynchronous commit. That approach has worked because all PL/SQL is like a batch program in a way the end user does not know the outcome of the procedure until it is completely finished. That s also why this asynchronous commit is used only in non-distributed PL/SQL blocks of code; if we involve more than one database, then there are two things two databases relying on the commit being durable. When two databases are relying on the commit being durable, we have to utilize synchronous protocols or a change might be committed in one database but not the other.
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Note Of course, pipelined PL/SQL functions deviate from normal PL/SQL functions. In normal PL/SQL
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functions, the outcome is not known until the end of the stored procedure call. Pipelined functions in general are able to return data to a client long before they complete (they return chunks of data to the client, a bit at a time). But since pipelined functions are called from SELECT statements and would not be committing anyway, they do not come into play in this discussion.
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Therefore, PL/SQL was developed to utilize an asynchronous commit, allowing the COMMIT statement in PL/SQL to not have to wait for the physical I/O to complete (avoiding the log file sync wait). That does not mean that you can t rely on a PL/SQL routine that commits and returns control to your application to not be durable with respect to its changes PL/SQL will wait for the redo it generated to be written to disk before returning to the client application but it will only wait once, right before it returns.
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Note The following example demonstrates a bad practice one that I call slow-by-slow processing or rowby-row processing, as row-by-row is synonymous with slow-by-slow in a relational database. It is meant just to illustrate how PL/SQL processes a commit statement.
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Consider this PL/SQL procedure: ops$tkyte%ORA11GR2> create table t 2 as 3 select * 4 from all_objects 5 where 1=0 6 / Table created. ops$tkyte%ORA11GR2> create or replace procedure p 2 as 3 begin 4 for x in ( select * from all_objects ) 5 loop 6 insert into t values X; 7 commit; 8 end loop; 9 end; 10 / Procedure created. That PL/SQL code reads a record at a time from ALL_OBJECTS, inserts the record into table T and commits each record as it is inserted. Logically, that code is the same as: ops$tkyte%ORA11GR2> create or replace procedure p 2 as 3 begin 4 for x in ( select * from all_objects ) 5 loop 6 insert into t values X; 7 commit write NOWAIT; 8 end loop; 9 10 -- make internal call here to ensure 11 -- redo was written by LGWR 12 end; 13 / Procedure created. So, the commits performed in the routine are done with WRITE NOWAIT and before the PL/SQL block of code returns to the client application, PL/SQL makes sure that the last bit of redo it generated was safely recorded to disk making the PL/SQL block of code and its changes durable.
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