Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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CHAPTER 10 ■ DATABASE TABLES 405 SESSION_CNT TRANSACTION_CNT ----------- --------------- 14 0 ops$tkyte@ORA10G> ops$tkyte@ORA10G> disconnect Disconnected from Oracle Database 10g Enterprise Edition Release 10.1.0.3.0 With the Partitioning, OLAP and Data Mining options ops$tkyte@ORA10G> connect / Connected. Since we’ve started a new session, we’ll see no rows in either table: ops$tkyte@ORA10G> select session_cnt, transaction_cnt 2 from ( select count(*) session_cnt from temp_table_session ), 3 ( select count(*) transaction_cnt from temp_table_transaction ); SESSION_CNT TRANSACTION_CNT ----------- --------------- 0 0 If you have experience with temporary tables in SQL Server and/or Sybase, the major consideration for you is that instead of executing SELECT X, Y, Z INTO #TEMP FROM SOME_TABLE to dynamically create and populate a temporary table, you will • Create all your global temporary tables once, as part of the application installation, just as you create permanent tables. • In your procedures, simply INSERT INTO TEMP (X,Y,Z) SELECT X,Y,Z FROM SOME_TABLE. Just to drive home the point, the goal here is to not create tables in your stored procedures at runtime. That is not the proper way to use temporary tables in Oracle. DDL is an expensive operation; you want to avoid doing that at runtime. The temporary tables for an application should be created during the application installation—never at runtime. Temporary tables can have many of the attributes of a permanent table. They may have triggers, check constraints, indexes, and so on. Features of permanent tables that they do not support include the following: • They cannot have referential integrity constraints. Neither can they be the target of a foreign key, nor can they have a foreign key defined on them. • They cannot have NESTED TABLE type columns. In Oracle9i and earlier, they cannot have VARRAY type columns either; this restriction was lifted in Oracle 10g. • They cannot be IOTs. • They cannot be in a cluster of any type. • They cannot be partitioned. • They cannot have statistics generated via the ANALYZE table command.
406 CHAPTER 10 ■ DATABASE TABLES One of the drawbacks of a temporary table in any database is the fact that the optimizer has no real statistics on it normally. When using the cost-based optimizer (CBO), valid statistics are vital to the optimizer’s success (or failure). In the absence of statistics, the optimizer will make guesses as to the distribution of data, the amount of data, and the selectivity of an index. When these guesses are wrong, the query plans generated for queries that make heavy use of temporary tables could be less than optimal. In many cases, the correct solution is to not use a temporary table at all, but rather to use an INLINE VIEW (for an example of an INLINE VIEW, refer to the SELECT just run—it has two of them) in its place. In this fashion, Oracle will have access to all of the relevant statistics for a table and can come up with an optimal plan. I find many times people use temporary tables because they learned in other databases that joining too many tables in a single query is a “bad thing.” This is a practice that must be unlearned for Oracle development. Rather than trying to outsmart the optimizer and breaking what should be a single query into three or four queries that store their subresults into temporary tables, and then combining the temporary tables, you should just code a single query that answers the original question. Referencing many tables in a single query is OK; the temporary table crutch is not needed in Oracle for this purpose. In other cases, however, the use of a temporary table in a process is the correct approach. For example, I once wrote a Palm sync application to synchronize the date book on a Palm Pilot with calendar information stored in Oracle. The Palm gives me a list of all records that have been modified since the last hot synchronization. I must take these records and compare them against the live data in the database, update the database records, and then generate a list of changes to be applied to the Palm. This is a perfect example of when a temporary table is very useful. I used a temporary table to store the changes from the Palm in the database. I then ran a stored procedure that bumps the Palm-generated changes against the live (and very large) permanent tables to discover what changes need to be made to the Oracle data, and then to find the changes that need to come from Oracle back down to the Palm. I have to make a couple of passes on this data. First, I find all records that were modified only on the Palm and make the corresponding changes in Oracle. Next, I find all records that were modified on both the Palm and my database since the last synchronization and rectify them. Then I find all records that were modified only on the database and place their changes into the temporary table. Lastly, the Palm sync application pulls the changes from the temporary table and applies them to the Palm device itself. Upon disconnection, the temporary data goes away. The issue I encountered, however, is that because the permanent tables were analyzed, the CBO was being used. The temporary table had no statistics on it (you can analyze the temporary table, but no statistics are gathered), and the CBO would “guess” many things about it. I, as the developer, knew the average number of rows I might expect, the distribution of the data, the selectivity of the indexes, and so on. I needed a way to inform the optimizer of these better guesses. There are three ways to give the optimizer statistics on the global temporary tables. One is via dynamic sampling (new in Oracle9i Release 2 and above) and the other is the DBMS_STATS package, which has two ways to accomplish this. First, let’s look at dynamic sampling. Dynamic sampling is the optimizer’s ability, when hard parsing a query, to scan segments in the database (sample them) to collect statistics useful in optimizing that particular query. It is akin to doing a “miniature gather statistics” command during a hard parse. In Oracle 10g, dynamic sampling will work out of the box, because the default setting has been increased from 1 to 2, and at level 2, the optimizer will dynamically sample any unanalyzed object referenced in a query processed by the optimizer prior to evaluating the query plan. In 9i Release 2,
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Expert Oracle Database Architecture
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Contents Foreword . . . . . . . . .
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■CONTENTS v Block Buffer Cache .
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■CONTENTS vii ■CHAPTER 9 Redo a
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■CONTENTS ix ■CHAPTER 12 Dataty
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Foreword “THINK.” In 1914, Thom
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■FOREWORD xiii Tom is an aficiona
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About the Technical Reviewers ■JO
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Introduction The inspiration for th
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■INTRODUCTION xix • Exposure to
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■INTRODUCTION xxi Chapter 3: File
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■INTRODUCTION xxiii Next up are t
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Setting Up Your Environment In this
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CHAPTER 1 ■ DEVELOPING SUCCESSFUL
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