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Alberto Dell’Era’s Oracle blog

Fast refresh of aggregate-only materialized views with MAX – algorithm. In this post I will illustrate the algorithm used by Oracle (in 11.2.0.3) to fast refresh a materialized view (MV) containing only the MAX aggregate function:. Create materialized view test mv build immediate refresh fast on demand with rowid as select gby as mv gby, count(*) as mv cnt star, max (dat) as mv max dat from test master - where whe = 0 group by gby ;. As usual, the MV log is configured to "log everything":. Note that coun...

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Alberto Dell’Era’s Oracle blog | adellera.it Reviews

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Fast refresh of aggregate-only materialized views with MAX – algorithm. In this post I will illustrate the algorithm used by Oracle (in 11.2.0.3) to fast refresh a materialized view (MV) containing only the MAX aggregate function:. Create materialized view test mv build immediate refresh fast on demand with rowid as select gby as mv gby, count(*) as mv cnt star, max (dat) as mv max dat from test master - where whe = 0 group by gby ;. As usual, the MV log is configured to log everything:. Note that coun...

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Alberto Dell’Era’s Oracle blog | adellera.it Reviews

https://adellera.it

Fast refresh of aggregate-only materialized views with MAX – algorithm. In this post I will illustrate the algorithm used by Oracle (in 11.2.0.3) to fast refresh a materialized view (MV) containing only the MAX aggregate function:. Create materialized view test mv build immediate refresh fast on demand with rowid as select gby as mv gby, count(*) as mv cnt star, max (dat) as mv max dat from test master - where whe = 0 group by gby ;. As usual, the MV log is configured to "log everything":. Note that coun...

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Alberto Dell’Era’s Oracle blog » 11gR2: materialized view logs changes

http://www.adellera.it/blog/2009/11/03/11gr2-materialized-view-logs-changes

11gR2: materialized view logs changes. In this post we are going to discuss some 11gR2 changes to materialized view logs that are aimed at increasing the performance of the fast-refresh engine of materialized views (MVs), especially the on-commit variant. The MV logs, in 10gr2, now comes in two flavours. The traditional (and still the default) timestamp. Based one and the brand new commit SCN. Timestamp-based MV logs (the "old" type). Now in 11gR2 (11.2.0.1):. The only difference is the new column xid$ (...

2

Alberto Dell’Era’s Oracle blog » “alter session force parallel query”, and indexes

http://www.adellera.it/blog/2013/05/17/alter-session-force-parallel-query-and-indexes

8220;alter session force parallel query”, and indexes. We will also check that issuing. Alter session force parallel query parallel N;. Is the same as specifying the hints. Parallel (t,N) */ /* parallel index (t, t idx, N) */. For all tables referenced in the query, and for all indexes defined on them. The former is quite obvious, the latter not that much). Parallel N", of course. The power of "force parallel query". Statement hints (the most popular option). Alter table/index parallel N. As Tanel Poder ...

3

Alberto Dell’Era’s Oracle blog » Fast refresh of aggregate-only materialized views – introduction

http://www.adellera.it/blog/2013/08/05/fast-refresh-of-aggregate-only-materialized-views-introduction

Fast refresh of aggregate-only materialized views – introduction. This post introduces a series about the algorithm used by Oracle (in 11.2.0.3) to fast refresh a materialized view (MV) containing only an aggregate:. Create materialized view test mv build immediate refresh fast on demand with rowid as select gby as mv gby, count(*) as mv cnt star, AGG (dat) as mv AGG dat, count(dat) as mv cnt dat from test master where whe = 0 group by gby ;. Where AGG is either SUM or MAX, the most important aggregates.

4

Alberto Dell'Era: investigations

http://www.adellera.it/investigations/index.html

CBO cardinality estimation for range predicates. CBO cardinality estimation for equi-joins over columns with histograms collected. Expected number of distinct values when selecting from a bag(urn,box) without replacement (formulae and proofs). CBO's use of the previous formula for cardinality estimation (DISTINCT/GROUP BY, joins). A short note about CBO's "NewDensity" in version 11g. Solving a statistical problem via the FFT implemented using the MODEL clause. Ported to WordPress by Headsetoptions.

5

Alberto Dell’Era’s Oracle blog » OLTP compression: migrated rows are compressed

http://www.adellera.it/blog/2013/04/07/oltp-compression-migrated-rows-are-compressed

OLTP compression: migrated rows are compressed. In his articles Compression in Oracle Part 2: Read-Only Data. And Compression in Oracle Part 3: OLTP Compression. Has shown that block (re)compression is never attempted on updates - it is attempted only on inserts (and, of course, only if the used space crosses the PCTFREE threshold). Now, since a row migration could be considered a row re-insertion - does it trigger a compression attempt of the block that the row is migrated into? That is, all identical r...

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OraJourn: 02/01/2010 - 03/01/2010

http://orajourn.blogspot.com/2010_02_01_archive.html

Tales of a Sojourner in the land of Oracle. Optimizer Developers' Blog (Oracle). Optimizer Developers' Blog (old). Thursday, February 18, 2010. VPD bad ANYDATA practices can really bite. After several days of intense testing, 4 SRs with Oracle Support (and another with the ERP vendor), and the very helpful information from Maxim Demenko about " out-of-range. Date values, I have developed a testcase that demonstrates how using bad ANYDATA practices in the context of VPD can really mess you up. Create user...

orajourn.blogspot.com

OraJourn: 10/01/2009 - 11/01/2009

http://orajourn.blogspot.com/2009_10_01_archive.html

Tales of a Sojourner in the land of Oracle. Optimizer Developers' Blog (Oracle). Optimizer Developers' Blog (old). Thursday, October 08, 2009. Concepts Guide: 8/27 - Memory Architecture. Like the picture on the 2nd page. Yes, I am visually oriented. When automatic SGA memory management is enabled, the sizes of the different SGA. Components are flexible and can adapt to the needs of a workload without requiring. As the workload changes, memory is redistributed to ensure optimal performance.". I did not re...

orajourn.blogspot.com

OraJourn: 07/01/2011 - 08/01/2011

http://orajourn.blogspot.com/2011_07_01_archive.html

Tales of a Sojourner in the land of Oracle. Optimizer Developers' Blog (Oracle). Optimizer Developers' Blog (old). Wednesday, July 27, 2011. Debug mode for MOS. Had an SR in which I learned about a debug mode for FLASH MOS (tried it in HTML, no go *grin*). Hold down the Control key and click on the Oracle My Oracle Support Logo in the upper left-hand corner:. Here is a short video, using Oracle's recommendation of CamStudio:. Links to this post. Wednesday, July 20, 2011. MOS 53: Search and Knowledge.

orajourn.blogspot.com

OraJourn: Debug mode for MOS

http://orajourn.blogspot.com/2011/07/debug-mode-for-mos.html

Tales of a Sojourner in the land of Oracle. Optimizer Developers' Blog (Oracle). Optimizer Developers' Blog (old). Wednesday, July 27, 2011. Debug mode for MOS. Had an SR in which I learned about a debug mode for FLASH MOS (tried it in HTML, no go *grin*). Hold down the Control key and click on the Oracle My Oracle Support Logo in the upper left-hand corner:. Here is a short video, using Oracle's recommendation of CamStudio:. Good way to show things. Subscribe to: Post Comments (Atom). Good for a laugh.

orajourn.blogspot.com

OraJourn: 05/01/2011 - 06/01/2011

http://orajourn.blogspot.com/2011_05_01_archive.html

Tales of a Sojourner in the land of Oracle. Optimizer Developers' Blog (Oracle). Optimizer Developers' Blog (old). Monday, May 16, 2011. Alertlog appears not be updated. After a few days of spinning my wheels and subjecting the poor recipients of oracle-l to multiple posts, I have identified an issue in Oracle code that I believe needs to be looked at. First, some background. Access("./alert.log", F OK) = 0. I believe when I changed diagnostic dest to a non-existing directory, Oracle automatically create...

orajourn.blogspot.com

OraJourn: 06/01/2011 - 07/01/2011

http://orajourn.blogspot.com/2011_06_01_archive.html

Tales of a Sojourner in the land of Oracle. Optimizer Developers' Blog (Oracle). Optimizer Developers' Blog (old). Friday, June 17, 2011. Bug 11858963: optimization goes wrong with FIRST ROWS K (11g)? At the beginning of March, I noticed some very odd things in a 10053 trace of a problem query I was working on. I also made some comments on Kerry Osborn's blog. If you have access to SRs, you can follow the history in SR 3-314198695. For those that cannot, here is a short summary. Card: Original: 10.00...

orajourn.blogspot.com

OraJourn: Bug 11858963: optimization goes wrong with FIRST_ROWS_K (11g)?

http://orajourn.blogspot.com/2011/06/bug-11858963-optimization-goes-wrong.html

Tales of a Sojourner in the land of Oracle. Optimizer Developers' Blog (Oracle). Optimizer Developers' Blog (old). Friday, June 17, 2011. Bug 11858963: optimization goes wrong with FIRST ROWS K (11g)? At the beginning of March, I noticed some very odd things in a 10053 trace of a problem query I was working on. I also made some comments on Kerry Osborn's blog. If you have access to SRs, you can follow the history in SR 3-314198695. For those that cannot, here is a short summary. Card: Original: 10.00...

leonotes.wordpress.com

LEO Notes | 第2页

https://leonotes.wordpress.com/page/2

Get partition definition using function. 一月 13, 2017. 获取所有RANGE分区的表分区的定义，脚本运行环境为Oracle 11.2.0.4，Oracle 10g去掉INTERVAL字段。 Insert log data into clob using plsql. 一月 13, 2017. 今天开发的一个同事想用PLSQL插入一些数据到CLOB字段，字符串较长，报错PLS-00172: string literal too long。 Orace Text Index-part4-contains query. 一月 10, 2017. 例如我想查询Blue Smith，Oracle Text index就无法返回Smith Blue这种记录。对于这种时候，我们可能希望全文索引能返回给我们Smith Blue或者Blue A Smith。 SQL commit; 提交完成。 SQL execute ctx ddl.sync index('IDX1 T LEXER'); PL/SQL 过程已成功完成。 SQL select id, create dat...

leonotes.wordpress.com

Oracle Text Index-part3 | LEO Notes

https://leonotes.wordpress.com/2016/12/30/oracle-text-index-part3

Orace Text Index-part4-contains query →. 十二月 30, 2016. 包含smith的记录ID为8，9，11，12，从DR$IDX1 T LEXER$I中获得到的TOKEN起始为8-12，TOKEN COUNT有4行，下面的输出记录了这些信息。 SQL COL TOKEN TEXT FOR A10 SQL COL TOKEN LASR FOR A10 SQL select token text,TOKEN TYPE,TOKEN FIRST,TOKEN LAST,TOKEN COUNT from DR$IDX1 T LEXER$I WHERE TOKEN TEXT = 'SMITH'; TOKEN TEXT TOKEN TYPE TOKEN FIRST TOKEN LAST TOKEN COUNT - - - - - - - - - - - - - - - - - - - - - - - - - - - SMITH 0 8 12 4. Orace Text Index-part4-contains query →. Address never made public).

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Quiz - Whose Answer is it Anyway? 18 weeks 3 days ago. 1 year 2 weeks ago. Yup i am also about to do. 1 year 3 weeks ago. Oracle Enterprise Manager Command Line Interface. 1 year 20 weeks ago. Expert Enterprise Manager 12c. 1 year 20 weeks ago. 1 year 34 weeks ago. Storage Indexes always Zero. 1 year 39 weeks ago. Yes that's right. This script. 1 year 40 weeks ago. 1 year 41 weeks ago. Exadata storage indexes not used. 1 year 48 weeks ago. BjÃ rn Kisbye Engsig. Johannes V. DjernÃ s. Jonah H. Harris.

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Alberto Dell’Era’s Oracle blog

Fast refresh of aggregate-only materialized views with MAX – algorithm. In this post I will illustrate the algorithm used by Oracle (in 11.2.0.3) to fast refresh a materialized view (MV) containing only the MAX aggregate function:. Create materialized view test mv build immediate refresh fast on demand with rowid as select gby as mv gby, count(*) as mv cnt star, max (dat) as mv max dat from test master - where whe = 0 group by gby ;. As usual, the MV log is configured to "log everything":. Note that coun...

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