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

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CHAPTER 13 ■ PARTITIONING 585 ops$tkyte@ORA10G> create index local_prefixed on partitioned_table (a,b) local; Index created. ops$tkyte@ORA10G> create index local_nonprefixed on partitioned_table (b) local; Index created. Next, we’ll insert some data into one partition and gather statistics: ops$tkyte@ORA10G> insert into partitioned_table 2 select mod(rownum-1,2)+1, rownum, 'x' 3 from all_objects; 48967 rows created. ops$tkyte@ORA10G> begin 2 dbms_stats.gather_table_stats 3 ( user, 4 'PARTITIONED_TABLE', 5 cascade=>TRUE ); 6 end; 7 / PL/SQL procedure successfully completed. We take offline tablespace P2, which contains the PART_2 partition for both the tables and indexes: ops$tkyte@ORA10G> alter tablespace p2 offline; Tablespace altered. Taking tablespace P2 offline will prevent Oracle from accessing those specific index partitions. It will be as if we had suffered “media failure,” causing them to become unavailable. Now we’ll query the table to see what index partitions are needed by different queries. This first query is written to permit the use of the local prefixed index: ops$tkyte@ORA10G> select * from partitioned_table where a = 1 and b = 1; A B DATA ---------- ---------- -------------------- 1 1 x That query succeeded, and we can see why by reviewing the explain plan. We’ll use the built-in package DBMS_XPLAN to see what partitions this query accesses. The PSTART (partition start) and PSTOP (partition stop) columns in the output show us exactly what partitions this query needs to have online and available in order to succeed: ops$tkyte@ORA10G> delete from plan_table; 4 rows deleted. ops$tkyte@ORA10G> explain plan for 2 select * from partitioned_table where a = 1 and b = 1; Explained.
586 CHAPTER 13 ■ PARTITIONING ops$tkyte@ORA10G> select * from table(dbms_xplan.display); PLAN_TABLE_OUTPUT ---------------------------------------------------------------------------------- | Operation | Name | Rows | Pstart| Pstop | ---------------------------------------------------------------------------------- | SELECT STATEMENT | | 1 | | | | PARTITION RANGE SINGLE | | 1 | 1 | 1 | | TABLE ACCESS BY LOCAL INDEX ROWID| PARTITIONED_TABLE | 1 | 1 | 1 | | INDEX RANGE SCAN | LOCAL_PREFIXED | 1 | 1 | 1 | ---------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 3 - access("A"=1 AND "B"=1) ■Note The DBMS_XPLAN output has been edited to remove information that was not relevant, in order to permit the examples to fit on the printed page. So, the query that uses LOCAL_PREFIXED succeeds. The optimizer was able to exclude PART_2 of LOCAL_PREFIXED from consideration because we specified A=1 in the query, and we can see clearly in the plan that PSTART and PSTOP are both equal to 1. Partition elimination kicked in for us. The second query fails, however: ops$tkyte@ORA10G> select * from partitioned_table where b = 1; ERROR: ORA-00376: file 13 cannot be read at this time ORA-01110: data file 13: '/home/ora10g/.../o1_mf_p2_1dzn8jwp_.dbf' no rows selected And using the same technique, we can see why: ops$tkyte@ORA10G> delete from plan_table; 4 rows deleted. ops$tkyte@ORA10G> explain plan for 2 select * from partitioned_table where b = 1; Explained. ops$tkyte@ORA10G> select * from table(dbms_xplan.display); PLAN_TABLE_OUTPUT ---------------------------------------------------------------------------------- | Operation | Name | Rows | Pstart| Pstop | ----------------------------------------------------------------------------------
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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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CHAPTER 4 ■ MEMORY STRUCTURES 117
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338 CHAPTER 10 ■ DATABASE TABLES
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CHAPTER 11 ■ ■ ■ Indexes Inde
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CHAPTER 11 ■ INDEXES 423 value of
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