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Posted by Mawahid in Points to Ponder. Undo logs. Traditionally transaction undo information was stored in Rollback Segments until a commit or rollback statement was issued. Automatic undo management allows the DBA to specify how long undo information should be retained after commit, preventing “snapshot too old” errors on long running queries. With the below information gathered by SQL query, you may have a idea to prevent undo space is running out so quickly. 1 A new extent will be allocated from the u...

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Posted by Mawahid in Points to Ponder. Undo logs. Traditionally transaction undo information was stored in Rollback Segments until a commit or rollback statement was issued. Automatic undo management allows the DBA to specify how long undo information should be retained after commit, preventing “snapshot too old” errors on long running queries. With the below information gathered by SQL query, you may have a idea to prevent undo space is running out so quickly. 1 A new extent will be allocated from the u...

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2 find entries

3 undo space

4 overview

5 undo segments

6 unexpired extents

7 expired extents

8 active extents

9 select

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Mawahid | mawahid-dba.blogspot.com Reviews

https://mawahid-dba.blogspot.com

Posted by Mawahid in Points to Ponder. Undo logs. Traditionally transaction undo information was stored in Rollback Segments until a commit or rollback statement was issued. Automatic undo management allows the DBA to specify how long undo information should be retained after commit, preventing “snapshot too old” errors on long running queries. With the below information gathered by SQL query, you may have a idea to prevent undo space is running out so quickly. 1 A new extent will be allocated from the u...

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mawahid-dba.blogspot.com

1

Mawahid: Nested Loop, Hash Join, Sort Merge Join, Cartesian join difference

http://mawahid-dba.blogspot.com/2011/11/nested-loop-hash-join-sort-merge-join.html

Nested Loop, Hash Join, Sort Merge Join, Cartesian join difference. Posted by Mawahid in Joins. The cost is calculated as below. Cost = access cost of A (access cost of B * no of rows from A). A nested loop join involves the following steps:. 1 The optimizer determines the driving table and designates it as the outer table. 2 The other table is designated as the inner table. 3 For every row in the outer table, Oracle accesses all the rows in the inner table. FROM EMP , DEPT. WHERE dept.deptno = 10. 3 1 T...

2

Mawahid: November 2011

http://mawahid-dba.blogspot.com/2011_11_01_archive.html

Posted by Mawahid in Points to Ponder. SQL select namespace,. Pinhitratio * 100 pinhitratio. NAMESPACE PINS PINHITS RELOADS INVALIDATIONS PINHITRATIO. SQL AREA 9510054 9475115 1920 1731 99.6326099. TABLE/PROCEDURE 2173571 2158422 2525 0 99.3030363. BODY 977001 976796 16 0 99.9790174. TRIGGER 28566 28491 11 0 99.7374501. INDEX 9735 8359 5 0 85.865434. CLUSTER 2294 2281 2 0 99.4333043. OBJECT 0 0 0 0 100. PIPE 0 0 0 0 100. JAVA SOURCE 0 0 0 0 100. JAVA RESOURCE 0 0 0 0 100. Select sum(pins) pins,. The libr...

3

Mawahid: February 2012

http://mawahid-dba.blogspot.com/2012_02_01_archive.html

Posted by Mawahid in Points to Ponder. Undo logs. Traditionally transaction undo information was stored in Rollback Segments until a commit or rollback statement was issued. Automatic undo management allows the DBA to specify how long undo information should be retained after commit, preventing “snapshot too old” errors on long running queries. With the below information gathered by SQL query, you may have a idea to prevent undo space is running out so quickly. 1 A new extent will be allocated from the u...

4

Mawahid: October 2010

http://mawahid-dba.blogspot.com/2010_10_01_archive.html

Jobs are not executing automatically on its scheduled intervals, next date is not updating though it is run manually. 1 If it is not executing automatically means, it is not entering into queue at the first place. Ps -ef grep sid ora j. If this return nothing means, cjq0 not doing its responsibility. 3 Check cjq0 process and kill it. SELECT A1.SID, A2.SPID FROM V$SESSION A1,V$PROCESS A2. WHERE A1.PADDR = A2.ADDR AND TYPE='BACKGROUND' AND A1.PROGRAM LIKE '%CJQ%';. Suppose there is a column in a table(TAG)...

5

Mawahid: When does oracle use Full Table Scan?

http://mawahid-dba.blogspot.com/2011/11/when-does-oracle-use-full-table-scan.html

When does oracle use Full Table Scan? Posted by Mawahid in Points to Ponder. Full Table Scans reads all the blocks under the High Water Mark and filter out those that do not meet the selection criteria. Each row is examined to determine whether it satisfies the statement’s WHERE clause. When the Optimizer Uses Full Table Scans. ScanSELECT last name, first name. WHERE UPPER(last name) LIKE :b1. If you need to use the index for case-independent searches, then either do not permit mixed-case data in the sea...

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Mawahid

Posted by Mawahid in Points to Ponder. Undo logs. Traditionally transaction undo information was stored in Rollback Segments until a commit or rollback statement was issued. Automatic undo management allows the DBA to specify how long undo information should be retained after commit, preventing “snapshot too old” errors on long running queries. With the below information gathered by SQL query, you may have a idea to prevent undo space is running out so quickly. 1 A new extent will be allocated from the u...

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