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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, else 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, l_fs2_blocks, l_fs2_bytes, l_fs3_blocks, l_fs3_bytes, l_fs4_blocks, l_fs4_bytes, l_full_blocks, l_full_bytes, p_partition); p( 'Unformatted Blocks ', l_unformatted_blocks ); p( 'FS1 Blocks (0-25) ', l_fs1_blocks ); p( 'FS2 Blocks (25-50) ', l_fs2_blocks ); p( 'FS3 Blocks (50-75) ', l_fs3_blocks ); p( 'FS4 Blocks (75-100)', l_fs4_blocks ); p( 'Full Blocks ', l_full_blocks ); else dbms_space.free_blocks( segment_owner => p_owner, segment_name => p_segname, segment_type => p_type, freelist_group_id => 0, free_blks => l_free_blks); p( 'Free Blocks', l_free_blks ); end if; -- and then the unused space API call to get the rest of the -- information dbms_space.unused_space ( segment_owner => p_owner, segment_name => p_segname, segment_type => p_type, partition_name => p_partition, total_blocks => l_total_blocks,
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total_bytes => l_total_bytes, unused_blocks => l_unused_blocks, unused_bytes => l_unused_bytes, LAST_USED_EXTENT_FILE_ID => l_LastUsedExtFileId, LAST_USED_EXTENT_BLOCK_ID => l_LastUsedExtBlockId, LAST_USED_BLOCK => l_LAST_USED_BLOCK ); p( p( p( p( p( p( p( p( end; / 'Total Blocks', l_total_blocks ); 'Total Bytes', l_total_bytes ); 'Total MBytes', trunc(l_total_bytes/1024/1024) ); 'Unused Blocks', l_unused_blocks ); 'Unused Bytes', l_unused_bytes ); 'Last Used Ext FileId', l_LastUsedExtFileId ); 'Last Used Ext BlockId', l_LastUsedExtBlockId ); 'Last Used Block', l_LAST_USED_BLOCK );
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Big_Table
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For examples throughout this book, I use a table called BIG_TABLE. Depending on which system I use, this table has between one record and four million records and varies in size from 200MB to 800MB. In all cases, the table structure is the same. To create BIG_TABLE, I wrote a script that does the following: Creates an empty table based on ALL_OBJECTS. This dictionary view is used to populate the BIG_TABLE. Makes this table NOLOGGING. This is optional. I did it for performance. Using NOLOGGING mode for a test table is safe; you won't use it in a production system, so features like Oracle Data Guard will not be enabled. Populates the table by seeding it with the contents of ALL_OBJECTS and then iteratively inserting into itself, approximately doubling its size on each iteration. Creates a primary key constraint on the table. Gathers statistics.
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To build the BIG_TABLE table, you can run the following script at the SQL*Plus prompt and pass in the number of rows you want in the table. The script will stop when it hits that number of rows. create table big_table as select rownum id, a.* from all_objects a where 1=0 / alter table big_table nologging; declare l_cnt number; l_rows number := &1; begin insert /*+ append */
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into big_table select rownum, a.* from all_objects a where rownum <= &1; l_cnt := sql%rowcount; commit; while (l_cnt < l_rows) loop insert /*+ APPEND */ into big_table select rownum+l_cnt, OWNER, OBJECT_NAME, SUBOBJECT_NAME, OBJECT_ID, DATA_OBJECT_ID, OBJECT_TYPE, CREATED, LAST_DDL_TIME, TIMESTAMP, STATUS, TEMPORARY, GENERATED, SECONDARY, NAMESPACE, EDITION_NAME from big_table where rownum <= l_rows-l_cnt; l_cnt := l_cnt + sql%rowcount; commit; end loop; end; / alter table big_table add constraint big_table_pk primary key(id); exec dbms_stats.gather_table_stats( user, 'BIG_TABLE', estimate_percent=> 1); I estimated baseline statistics on the table. The index associated with the primary key will have statistics computed automatically when it is created.
Coding Conventions
The one coding convention I use in this book that I would like to point out is how I name variables in PL/SQL code. For example, consider a package body like this: create or replace package body my_pkg as g_variable varchar2(25); procedure p( p_variable in varchar2 ) is l_variable varchar2(25); begin null; end; end; / Here I have three variables: a global package variable, G_VARIABLE; a formal parameter to the procedure, P_VARIABLE; and a local variable, L_VARIABLE. I name my variables after the scope they are contained in. All globals begin with G_, parameters with P_, and local variables with L_. The main reason
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