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Initialization Parameters Set at the PDB Level Are Not Always Honored

Before describing the issue that lead to this post, let’s shortly review how the handling of initialization parameters works in a multitenant environment. Initialization parameters exist at both the CDB level and the PDB level. This is a critical feature...

Veröffentlicht 11 Nov 2016 9:58 von triBLOG

Gespeichert unter: bug, 12cR1, multitenant, 12cR2
Auto SGA Management Impacts the Default Value of DB_FILE_MULTIBLOCK_READ_COUNT

The database engine determines the maximum disk I/O size used during multiblock reads (for example, full table scans or index fast full scans) by multiplying the values of the db_block_size and db_file_multiblock_read_count initialization parameters....

Veröffentlicht 10 Okt 2015 11:05 von triBLOG

Gespeichert unter: bug, 11gR2, 11gR1, 10gR2, Top, 12cR1
Memory Leak in Network Checksum with new SHA-2 Functions

I’ve just stumbled over an issue with the new checksum algorithm introduced with Oracle 12c. It seams that in certain situation the new SHA-2 function cause a memory leak. A search on My Oracle Support revealed that there is a Bug on AIX. See Bug...

Veröffentlicht 3 Sep 2015 15:33 von triBLOG

Gespeichert unter: bug, Security, 12cR1, Trivadis Security eXperts
Bugs Related to SQL Plan Directives Pack and Unpack

SQL plan directives are a new concept introduced in version 12.1. Their purpose is to help the query optimizer cope with misestimates. To do so, they store in the data dictionary information about the predicates that cause misestimates. Simply put, the...

Veröffentlicht 13 Jul 2015 17:17 von triBLOG

Gespeichert unter: bug, Query Optimizer, 12cR1, sql plan directives
The Broken Statistics: “parse count (total)” and “session cursor cache hits”

The values provided by the “parse count (total)” and “session cursor cache hits” statistics are subject to several bugs. And, what’s worse, for years Oracle didn’t care to fix it. This is my impression, at least. Then, when few...

Veröffentlicht 14 Aug 2013 18:18 von triBLOG

Gespeichert unter: bug, 11gR2, 11gR1, 10gR2, 12cR1

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Initialization Parameters Set at the PDB Level Are Not Always Honored

Auto SGA Management Impacts the Default Value of DB_FILE_MULTIBLOCK_READ_COUNT

Memory Leak in Network Checksum with new SHA-2 Functions

Bugs Related to SQL Plan Directives Pack and Unpack

The Broken Statistics: “parse count (total)” and “session cursor cache hits”