2019独角兽企业重金招聘Python工程师标准>>> 
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Script 1: Index Fragmentation
TFSIFRAG.SQL provides information critical in determining whether an
index is a candidate for rebuilding. An index is a candidate for
rebuilding when a relatively high number of index leaf row deletes have
occured.
Please note: This report does not indicate the actual index "balance."
Script 2: Index Statistics
TFSISTAT.SQL prints a variety of statistics about the given index.
Statistics include B*tree height, the number of distinct and repeated
keys, the number of branch rows and blocks, the number of leaf rows
and blocks and information about space utilization.
Please note: You will receive an "ORA-01476: divisor is equal to
zero" for an index on a table into which no rows have been inserted.
Script 3: Index Keys for a Table
TFSINKEY.SQL prints uniqueness, name and column information of indexes for the
given table and owner. The arguments are not case-sensitive, but may not
include wildcards. The script will behave unreliably for an index not owned
by the owner of its base table.
=========
Script #1:
==========
SET ECHO off
REM NAME: TFSIFRAG.SQL
REM USAGE:"@path/tfsifrag schema_name index_name"
REM ------------------------------------------------------------------------
REM REQUIREMENTS:
REM SELECT on INDEX_STATS
REM ------------------------------------------------------------------------
REM PURPOSE:
REM Reports index fragmentation statistics
REM ------------------------------------------------------------------------
REM EXAMPLE:
REM Index Fragmentation Statistic
REM
REM index name S_EMP_USERID_UK
REM leaf rows deleted 0
REM leaf rows in use 25
REM index badness 0.000
REM
REM ------------------------------------------------------------------------
REM Main text of script follows:
set verify off
def ownr = &&1
def name = &&2
ttitle -
center 'Index Fragmentation Statistic' skip 2
set heading off
col name newline
col lf_blk_rows newline
col del_lf_rows newline
col ibadness newline
validate index &ownr..&name;
select
'index name '||name,
'leaf rows deleted '||to_char(del_lf_rows,'999,999,990') del_lf_rows,
'leaf rows in use '||to_char(lf_rows-del_lf_rows,'999,999,990') lf_blk_rows,
'index badness '||to_char(del_lf_rows/(lf_rows+0.00001),'999,990.999') ibadness
from
index_stats
/
undef ownr
undef name
set verify on
==============
Sample Output:
==============
Index Fragmentation Statistic
index name S_EMP_USERID_UK
leaf rows deleted 0
leaf rows in use 25
index badness 0.000
==========
Script #2:
==========
SET ECHO off
REM NAME: TFSISTAT.SQL
REM USAGE:"@path/tfsistat schema_name index_name"
REM ------------------------------------------------------------------------
REM REQUIREMENTS:
REM SELECT on INDEX_STATS
REM ------------------------------------------------------------------------
REM PURPOSE:
REM Report index statistics.
REM ------------------------------------------------------------------------
REM EXAMPLE:
REM Index Statistics
REM
REM S_EMP_USERID_UK
REM ----------------------------------------------------------
REM height 1
REM blocks 5
REM del_lf_rows 0
REM del_lf_rows_len 0
REM distinct_keys 25
REM most_repeated_key 1
REM btree_space 1,876
REM used_space 447
REM pct_used 24
REM rows_per_key 1
REM blks_gets_per_access 2
REM lf_rows 25 br_rows 0
REM lf_blks 1 br_blks 0
REM lf_rows_len 447 br_rows_len 0
REM lf_blk_len 1,876 br_blk_len 0
REM
REM ------------------------------------------------------------------------
REM Main text of script follows:
set verify off
def ownr = &&1
def name = &&2
ttitle -
center 'Index Statistics' skip 2
set heading off
col name newline
col headsep newline
col height newline
col blocks newline
col lf_rows newline
col lf_blks newline
col lf_rows_len newline
col lf_blk_len newline
col br_rows newline
col br_blks newline
col br_rows_len newline
col br_blk_len newline
col del_lf_rows newline
col del_lf_rows_len newline
col distinct_keys newline
col most_repeated_key newline
col btree_space newline
col used_space newline
col pct_used newline
col rows_per_key newline
col blks_gets_per_access newline
validate index &ownr..&name;
select
name,
'----------------------------------------------------------' headsep,
'height '||to_char(height, '999,999,990') height,
'blocks '||to_char(blocks, '999,999,990') blocks,
'del_lf_rows '||to_char(del_lf_rows,'999,999,990') del_lf_rows,
'del_lf_rows_len '||to_char(del_lf_rows_len,'999,999,990') del_lf_rows_len,
'distinct_keys '||to_char(distinct_keys,'999,999,990') distinct_keys,
'most_repeated_key '||to_char(most_repeated_key,'999,999,990') most_repeated_key,
'btree_space '||to_char(btree_space,'999,999,990') btree_space,
'used_space '||to_char(used_space,'999,999,990') used_space,
'pct_used '||to_char(pct_used,'990') pct_used,
'rows_per_key '||to_char(rows_per_key,'999,999,990') rows_per_key,
'blks_gets_per_access '||to_char(blks_gets_per_access,'999,999,990') blks_gets_per_access,
'lf_rows '||to_char(lf_rows, '999,999,990')||' '||+
'br_rows '||to_char(br_rows, '999,999,990') br_rows,
'lf_blks '||to_char(lf_blks, '999,999,990')||' '||+
'br_blks '||to_char(br_blks, '999,999,990') br_blks,
'lf_rows_len '||to_char(lf_rows_len,'999,999,990')||' '||+
'br_rows_len '||to_char(br_rows_len,'999,999,990') br_rows_len,
'lf_blk_len '||to_char(lf_blk_len, '999,999,990')||' '||+
'br_blk_len '||to_char(br_blk_len, '999,999,990') br_blk_len
from
index_stats
/
undef ownr
undef name
set verify on
==============
Sample Output:
==============
Index Statistics
S_EMP_USERID_UK
----------------------------------------------------------
height 1
blocks 5
del_lf_rows 0
del_lf_rows_len 0
distinct_keys 25
most_repeated_key 1
btree_space 1,876
used_space 447
pct_used 24
rows_per_key 1
blks_gets_per_access 2
lf_rows 25
br_rows 0
lf_blks 1
br_blks 0
lf_rows_len 447
br_rows_len 0
lf_blk_len 1,876
br_blk_len 0
==========
Script #3:
==========
SET ECHO off
REM NAME: TFSIKEYS.SQL
REM USAGE:"@path/tfsikeys idx_owner table_name"
REM ------------------------------------------------------------------------
REM REQUIREMENTS:
REM SELECT on DBA_IND_COLUMNS and DBA_INDEXES
REM ------------------------------------------------------------------------
REM PURPOSE:
REM Shows the index keys for a particular table.
REM ------------------------------------------------------------------------
REM EXAMPLE:
REM Index Keys Summary
REM
REM Uniqueness Index Name Column Name
REM ---------- ---------------------------------------- ------------------
REM UNIQUE SCOTT.S_EMP_ID_PK ID
REM
REM UNIQUE SCOTT.S_EMP_USERID_UK USERID
REM
REM ------------------------------------------------------------------------
REM Main text of script follows:
set verify off
def ixowner = &&1
def tabname = &&2
ttitle -
center 'Index Keys Summary' skip 2
col uniq format a10 heading 'Uniqueness' justify c trunc
col indname format a40 heading 'Index Name' justify c trunc
col colname format a25 heading 'Column Name' justify c trunc
break -
on indname skip 1 -
on uniq
select
ind.uniqueness uniq,
ind.owner||'.'||col.index_name indname,
col.column_name colname
from
dba_ind_columns col,
dba_indexes ind
where
ind.owner = upper('&ixowner')
and
ind.table_name = upper('&tabname')
and
col.index_owner = ind.owner
and
col.index_name = ind.index_name
order by
col.index_name,
col.column_position
/
undef ixowner
undef tabname
set verify on
==============
Sample Output:
==============
Index Keys Summary
Uniqueness Index Name Column Name
---------- ---------------------------------------- ----------------------
UNIQUE SCOTT.S_EMP_ID_PK ID
UNIQUE SCOTT.S_EMP_USERID_UK USERID