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For example, to see how much redo is generated by some UPDATE statement we can: big_table@ORA11GR2> @mystat "redo size" big_table@ORA11GR2> set echo off NAME VALUE ------------------------------ ---------redo size 496 big_table@ORA11GR2> update big_table set owner = lower(owner) 2 where rownum <= 1000; 1000 rows updated. big_table@ORA11GR2> @mystat2 big_table@ORA11GR2> set echo off NAME V DIFF ------------------------------ ---------- ---------------redo size 89592 89,096 This shows our UPDATE of 1,000 rows generated 89,096 bytes of redo.
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The SHOW_SPACE routine prints detailed space utilization information for database segments. Here is the interface to it: ops$tkyte@ORA11GR2> desc show_space PROCEDURE show_space Argument Name Type ------------------------------ ----------------------P_SEGNAME VARCHAR2 P_OWNER VARCHAR2 P_TYPE VARCHAR2 P_PARTITION VARCHAR2 The arguments are as follows: P_SEGNAME - Name of the segment the table or index name, for example. P_OWNER - Defaults to the current user, but you can use this routine to look at some other schema. P_TYPE - Defaults to TABLE and represents the type of object you are looking at. For example, select distinct segment_type from dba_segments lists valid segment types. P_PARTITION - Name of the partition when you show the space for a partitioned object. SHOW_SPACE shows space for only a partition at a time.
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In/Out -----IN IN IN IN
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Default -------DEFAULT DEFAULT DEFAULT
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The output of this routine looks as follows, when the segment resides in an Automatic Segment Space Management (ASSM) tablespace:
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big_table@ORA11GR2> exec show_space('BIG_TABLE'); Unformatted Blocks ..................... 0 FS1 Blocks (0-25) ..................... 0 FS2 Blocks (25-50) ..................... 0 FS3 Blocks (50-75) ..................... 0 FS4 Blocks (75-100)..................... 0 Full Blocks ..................... 14,469 Total Blocks............................ 15,360 Total Bytes............................. 125,829,120 Total MBytes............................ 120 Unused Blocks........................... 728 Unused Bytes............................ 5,963,776 Last Used Ext FileId.................... 4 Last Used Ext BlockId................... 43,145 Last Used Block......................... 296 PL/SQL procedure successfully completed. The items reported are as follows: Unformatted Blocks The number of blocks that are allocated to the table below the high water mark, but have not been used. Add unformatted and unused blocks together to get a total count of blocks allocated to the table but never used to hold data in an ASSM object. FS1 Blocks-FS4 Blocks Formatted blocks with data. The ranges of numbers after their name represent the emptiness of each block. For example, (0-25) is the count of blocks that are between 0 and 25 percent empty. Full Blocks The number of blocks that are so full that they are no longer candidates for future inserts. Total Blocks, Total Bytes, Total Mbytes - The total amount of space allocated to the segment measured in database blocks, bytes, and megabytes. Unused Blocks, Unused Bytes Represents a portion of the amount of space never used. These are blocks allocated to the segment but are currently above the high water mark of the segment Last Used Ext FileId The file ID of the file that contains the last extent that contains data. 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 block ID 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@ORA11GR2> 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
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Last Used Ext BlockId................... Last Used Block......................... PL/SQL procedure successfully completed.
139,273 6,576
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 that wants 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; 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
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