DOAG Regio 2013 -1
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DOAG Regio 2013 -1
DOAG Regio 2013 -2
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Hinweis:
Im Metalink Dokument (Package for disabling AWR without a Diagnostic Pack
license in Oracle (Doc ID 436386.1) wird erklärt, dass für den Segment und Undo-
Advisor kein Diagnostic Pack Voraussetzung ist.
Stichwörter: ADDM, Automatic Database Diagnostic Monitor
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Top 50 Index Vorschläge: SELECT * FROM (
SELECT tc.owner||'.'||o.object_name as
segment_name,tc.column_name,
round(s.bytes/1024/1024) Size_M,
cu.equality_preds "=",
cu.equijoin_preds "E-JOIN",cu.nonequijoin_preds "NE-
JOIN",cu.range_preds range,cu.like_preds "LIKE",
cu.null_preds "NULL",
cu.equality_preds+cu.equijoin_preds+cu.nonequijoin_preds+cu.r
ange_preds+cu.like_preds+cu.null_preds as summe
FROM sys.col_usage$ cu, dba_objects o,
dba_tab_columns tc, dba_ind_columns ic, dba_segments s
WHERE o.object_id=cu.obj#
AND o.object_name=tc.table_name
AND o.owner=tc.owner
AND cu.equality_preds>0
AND cu.intcol#= tc.column_id
AND tc.owner=ic.table_owner(+)
AND tc.table_name=ic.table_name(+)
AND tc.column_name=ic.column_name(+)
AND ic.index_name is NULL
AND o.owner=s.owner(+)
AND o.object_name=s.segment_name(+)
AND o.owner ='SCOTT'
ORDER BY 10 desc,1,2)
WHERE rownum <50;
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Der Fragmentierungsgrad einer Tabelle kann auch von folgenden Kriterien
abhängen :
• PCTFREE
• Verwaltungsgröße des Tablespace
• Zeilenlänge (insbesondere, wenn sie die Blockgröße übersteigt)
Stichwörter: Fragmentierung von Tabellen
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Hinweis: Index zu groß? SELECT owner,
segment_name,
bytes/1024/1024
FROM dba_segments
WHERE segment_type='INDEX'
AND owner NOT IN ('SYS','SYSTEM')
ORDER BY 3 DESC;
Welcher Index wird nicht benutzt ? SELECT *
FROM dba_objects
WHERE object_id IN
(SELECT i.obj#
FROM sys.icol$ i,
sys.col_usage$ c
WHERE i.bo# =c.obj#(+)
AND i.col# =c.intcol#(+)
AND c.obj# IS NULL )
AND owner NOT IN ('SYS','SYSTEM','OUTLN','WMSYS','XDB','EXFSYS','SYSMAN','HR','OLAPSYS',
'MDSYS','FLOWS_030000','OE','IX','DBSNMP','PERFSTAT','CTXSYS','ORDDATA','ORDSYS','APEX_0302
00');
REM Welche Indizes haben Spalten mehrfach indiziert?
SELECT index_owner,index_name,table_owner,table_name,column_name,column_position,descend
FROM dba_ind_columns
WHERE (table_owner||table_name||column_name) IN
(SELECT table_owner||table_name||column_name
FROM dba_ind_columns
WHERE table_owner IN ('SCOTT')
GROUP BY table_owner,
table_name,
column_name
HAVING COUNT(*)>1
);
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