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

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■SETTING UP YOUR ENVIRONMENT xxxix • Last Used Ext BlockId: The block ID of the beginning of the last extent; the block ID within the last used file. • Last Used Block: The offset of the last block used in the last extent. When you use SHOW_SPACE to look at objects in user space managed tablespaces, the output resembles this: big_table@ORA10G> exec show_space( 'BIG_TABLE' ) Free Blocks............................. 1 Total Blocks............................ 147,456 Total Bytes............................. 1,207,959,552 Total MBytes............................ 1,152 Unused Blocks........................... 1,616 Unused Bytes............................ 13,238,272 Last Used Ext FileId.................... 7 Last Used Ext BlockId................... 139,273 Last Used Block......................... 6,576 PL/SQL procedure successfully completed. The only difference is the Free Blocks item at the beginning of the report. This is a count of the blocks in the first freelist group of the segment. My script reports only on this freelist group. You would need to modify the script to accommodate multiple freelist groups. The commented code follows. This utility is a simple layer on top of the DBMS_SPACE API in the database. create or replace procedure show_space ( p_segname in varchar2, p_owner in varchar2 default user, p_type in varchar2 default 'TABLE', p_partition in varchar2 default NULL ) -- this procedure uses authid current user so it can query DBA_* -- views using privileges from a ROLE, and so it can be installed -- once per database, instead of once per user who wanted to use it authid current_user as l_free_blks number; l_total_blocks number; l_total_bytes number; l_unused_blocks number; l_unused_bytes number; l_LastUsedExtFileId number; l_LastUsedExtBlockId number; l_LAST_USED_BLOCK number; l_segment_space_mgmt varchar2(255); l_unformatted_blocks number; l_unformatted_bytes number; l_fs1_blocks number; l_fs1_bytes number;
xl ■SETTING UP YOUR ENVIRONMENT l_fs2_blocks number; l_fs2_bytes number; l_fs3_blocks number; l_fs3_bytes number; l_fs4_blocks number; l_fs4_bytes number; l_full_blocks number; l_full_bytes number; -- inline procedure to print out numbers nicely formatted -- with a simple label procedure p( p_label in varchar2, p_num in number ) is begin dbms_output.put_line( rpad(p_label,40,'.') || to_char(p_num,'999,999,999,999') ); end; begin -- this query is executed dynamically in order to allow this procedure -- to be created by a user who has access to DBA_SEGMENTS/TABLESPACES -- via a role as is customary. -- NOTE: at runtime, the invoker MUST have access to these two -- views! -- this query determines if the object is an ASSM object or not begin execute immediate 'select ts.segment_space_management from dba_segments seg, dba_tablespaces ts where seg.segment_name = :p_segname and (:p_partition is null or seg.partition_name = :p_partition) and seg.owner = :p_owner and seg.tablespace_name = ts.tablespace_name' into l_segment_space_mgmt using p_segname, p_partition, p_partition, p_owner; exception when too_many_rows then dbms_output.put_line ( 'This must be a partitioned table, use p_partition => '); return; end; -- if the object is in an ASSM tablespace, we must use this API -- call to get space information, otherwise we use the FREE_BLOCKS -- API for the user-managed segments if l_segment_space_mgmt = 'AUTO' then dbms_space.space_usage ( p_owner, p_segname, p_type, l_unformatted_blocks, l_unformatted_bytes, l_fs1_blocks, l_fs1_bytes,
Page 2 and 3: Expert Oracle Database Architecture
Page 4 and 5: Contents Foreword . . . . . . . . .
Page 6 and 7: ■CONTENTS v Block Buffer Cache .
Page 8 and 9: ■CONTENTS vii ■CHAPTER 9 Redo a
Page 10 and 11: ■CONTENTS ix ■CHAPTER 12 Dataty
Page 12 and 13: Foreword “THINK.” In 1914, Thom
Page 14 and 15: ■FOREWORD xiii Tom is an aficiona
Page 16 and 17: About the Technical Reviewers ■JO
Page 18 and 19: Introduction The inspiration for th
Page 20 and 21: ■INTRODUCTION xix • Exposure to
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Page 26 and 27: Setting Up Your Environment In this
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CHAPTER 3 ■ FILES 71 all operatio
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CHAPTER 3 ■ FILES 89 A Brief Revi
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CHAPTER 4 ■ MEMORY STRUCTURES 117
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CHAPTER 5 ■ ORACLE PROCESSES 157
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284 CHAPTER 9 ■ REDO AND UNDO cri
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336 CHAPTER 9 ■ REDO AND UNDO tou
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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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CHAPTER 11 ■ INDEXES 425 One of t
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CHAPTER 11 ■ INDEXES 427 We then
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CHAPTER 11 ■ INDEXES 429 we ended
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CHAPTER 11 ■ INDEXES 431 The data
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CHAPTER 11 ■ INDEXES 435 Table 11
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CHAPTER 11 ■ INDEXES 437 When Sho
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CHAPTER 11 ■ INDEXES 439 an 8KB b
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CHAPTER 11 ■ INDEXES 441 select *
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CHAPTER 11 ■ INDEXES 445 Indicate
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CHAPTER 11 ■ INDEXES 447 an index
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CHAPTER 11 ■ INDEXES 449 Table 11
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CHAPTER 11 ■ INDEXES 451 9 1, 'M'
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CHAPTER 11 ■ INDEXES 453 column w
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CHAPTER 11 ■ INDEXES 455 Bitmap j
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CHAPTER 12 ■ DATATYPES 515 Coping
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CHAPTER 12 ■ DATATYPES 521 Format
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CHAPTER 12 ■ DATATYPES 555 ROWID/
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CHAPTER 13 ■ ■ ■ Partitioning
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CHAPTER 13 ■ PARTITIONING 559 6 (
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CHAPTER 13 ■ PARTITIONING 561 els
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CHAPTER 13 ■ PARTITIONING 563 BIG
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CHAPTER 13 ■ PARTITIONING 565 Enh
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706 ■INDEX autonomous transaction
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