Comments on: latch: cache buffers chains latch contention – a better way for finding the hot block http://blog.tanelpoder.com/2009/08/27/latch-cache-buffers-chains-latch-contention-a-better-way-for-finding-the-hot-block/ Oracle troubleshooting, internals and performance tuning Mon, 15 Mar 2010 01:50:11 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Tanel Poder http://blog.tanelpoder.com/2009/08/27/latch-cache-buffers-chains-latch-contention-a-better-way-for-finding-the-hot-block/comment-page-1/#comment-2750 Tanel Poder Tue, 13 Oct 2009 08:35:24 +0000 http://blog.tanelpoder.com/?p=417#comment-2750 For example this: SQL> create view my$ksuprlat as select * from sys.x$ksuprlat; View created. SQL> grant select on my$ksuprlat to dba; Grant succeeded. SQL> create public synonym my$ksuprlat for sys.x$ksuprlat; Synonym created. SQL> SQL> select count(*) from x$ksuprlat; COUNT(*) ---------- 0 For example this:

SQL> create view my$ksuprlat as select * from sys.x$ksuprlat;

View created.

SQL> grant select on my$ksuprlat to dba;

Grant succeeded.

SQL> create public synonym my$ksuprlat for sys.x$ksuprlat;

Synonym created.

SQL>
SQL> select count(*) from x$ksuprlat;

COUNT(*)
———-
0

]]> By: Md. Zafar Ahsan http://blog.tanelpoder.com/2009/08/27/latch-cache-buffers-chains-latch-contention-a-better-way-for-finding-the-hot-block/comment-page-1/#comment-2749 Md. Zafar Ahsan Tue, 13 Oct 2009 07:35:01 +0000 http://blog.tanelpoder.com/?p=417#comment-2749 Hi, Can anyone let me know how to create X$ proxy views based on x$tables as it gives ORA-01731: Regards zafar Hi,
Can anyone let me know how to create X$ proxy views based on x$tables as it gives ORA-01731:

Regards
zafar

]]> By: Blogroll Report 21/08/2009 – 28/08/2009 « Coskan’s Approach to Oracle http://blog.tanelpoder.com/2009/08/27/latch-cache-buffers-chains-latch-contention-a-better-way-for-finding-the-hot-block/comment-page-1/#comment-2456 Blogroll Report 21/08/2009 – 28/08/2009 « Coskan’s Approach to Oracle Tue, 08 Sep 2009 12:04:43 +0000 http://blog.tanelpoder.com/?p=417#comment-2456 [...] Tanel Poder -latch: cache buffers chains latch contention – a better way for finding the hot block [...] [...] Tanel Poder -latch: cache buffers chains latch contention – a better way for finding the hot block [...]

]]> By: Kyle Hailey http://blog.tanelpoder.com/2009/08/27/latch-cache-buffers-chains-latch-contention-a-better-way-for-finding-the-hot-block/comment-page-1/#comment-2437 Kyle Hailey Thu, 03 Sep 2009 21:23:33 +0000 http://blog.tanelpoder.com/?p=417#comment-2437 Excellent analysis. Love the DUAL CONNECT BY LEVEL in latchprofx and the object id in select ksulawhy FROM x$ksuprlat that's a great find. Cool stuff. Thanks Tanel Excellent analysis. Love the
DUAL CONNECT BY LEVEL
in latchprofx
and the object id in
select ksulawhy FROM x$ksuprlat
that’s a great find.

Cool stuff.
Thanks Tanel

]]> By: Bernard Polarski http://blog.tanelpoder.com/2009/08/27/latch-cache-buffers-chains-latch-contention-a-better-way-for-finding-the-hot-block/comment-page-1/#comment-2399 Bernard Polarski Mon, 31 Aug 2009 08:45:08 +0000 http://blog.tanelpoder.com/?p=417#comment-2399 In the script bhla.sql I got lru_flags of type 0,2,4,6,8. With a bit of search I managed to find than 0 means not set, 2 is cold LRU, 8 is hot MRU but could not find any explaination on values 4 and 6. In Ixora I find a mention of 'AUX' for 4 which seems to refer to 'auxiliary list' without any explanation on what are those auxiliary list. Do you have any explanation on those lru_flag code? In the script bhla.sql I got lru_flags of type 0,2,4,6,8. With a bit of search I managed to find than 0 means not set, 2 is cold LRU, 8 is hot MRU but could not find any explaination on values 4 and 6. In Ixora I find a mention of ‘AUX’ for 4 which seems to refer to ‘auxiliary list’ without any explanation on what are those auxiliary list. Do you have any explanation on those lru_flag code?

]]> By: Log Buffer #159: a Carnival of the Vanities for DBAs « PlanetMysql.ru – информация о СУБД MySQL http://blog.tanelpoder.com/2009/08/27/latch-cache-buffers-chains-latch-contention-a-better-way-for-finding-the-hot-block/comment-page-1/#comment-2385 Log Buffer #159: a Carnival of the Vanities for DBAs « PlanetMysql.ru – информация о СУБД MySQL Fri, 28 Aug 2009 19:17:33 +0000 http://blog.tanelpoder.com/?p=417#comment-2385 [...] Poder lays out a better way for finding the hot block when facing cache buffers chains latch [...] [...] Poder lays out a better way for finding the hot block when facing cache buffers chains latch [...]

]]> By: Log Buffer #159: a Carnival of the Vanities for DBAs | Pythian Group Blog http://blog.tanelpoder.com/2009/08/27/latch-cache-buffers-chains-latch-contention-a-better-way-for-finding-the-hot-block/comment-page-1/#comment-2383 Log Buffer #159: a Carnival of the Vanities for DBAs | Pythian Group Blog Fri, 28 Aug 2009 17:05:55 +0000 http://blog.tanelpoder.com/?p=417#comment-2383 [...] Poder lays out a better way for finding the hot block when facing cache buffers chains latch [...] [...] Poder lays out a better way for finding the hot block when facing cache buffers chains latch [...]

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