10-25-2009
Are you running Oracle?
An Oracle database is a heavy user of shared memory. For example, shared memory is used for implementing the SGA (System Global Area) which is Oracle's structurad memory area that facilitates the transfer of data and information between clients and the database.
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I am running HP-UX B.11.11.
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Hellp all,
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hi,
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I am writing a shared library in Linux (but compatible with other UNIXes) and I want to allow multiple instances to share a piece of memory -- 1 byte is enough. What's the "best" way to do this? I want to optimize for speed and portability.
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Hello, I am using Linux os.
$ df -k /dev/shm
Filesystem 1K-blocks Used Available Use% Mounted on
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$
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------ Shared Memory Segments --------
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LEARN ABOUT DEBIAN
dbix::searchbuilder::handle::oracle
DBIx::SearchBuilder::Handle::Oracle(3pm) User Contributed Perl Documentation DBIx::SearchBuilder::Handle::Oracle(3pm)
NAME
DBIx::SearchBuilder::Handle::Oracle - An oracle specific Handle object
SYNOPSIS
DESCRIPTION
This module provides a subclass of DBIx::SearchBuilder::Handle that compensates for some of the idiosyncrasies of Oracle.
METHODS
Connect PARAMHASH: Driver, Database, Host, User, Password
Takes a paramhash and connects to your DBI datasource.
BuildDSN
Customized version of "BuildDSN" in DBIx::SearchBuilder::Handle method.
Takes additional argument SID. Database argument used unless SID provided. Two forms of DSN are generated depending on whether Host
defined or not:
dbi:Oracle:sid=<SID>;host=...[;port=...]
dbi:Oracle:<SID>
Read details in documentation for DBD::Oracle module.
Insert
Takes a table name as the first argument and assumes that the rest of the arguments are an array of key-value pairs to be inserted.
InsertFromSelect
Customization of "InsertFromSelect" in DBIx::SearchBuilder::Handle.
Unlike other DBs Oracle needs:
o id generated from sequences for every new record.
o query wrapping in parens.
NOTE that on Oracle there is a limitation on the query. Every column in the result should have unique name or alias, for example the
following query would generate "ORA-00918: column ambiguously defined" error:
SELECT g.id, u.id FROM ...
Solve with aliases:
SELECT g.id AS group_id, u.id AS user_id FROM ...
KnowsBLOBs
Returns 1 if the current database supports inserts of BLOBs automatically. Returns undef if the current database must be informed of BLOBs
for inserts.
BLOBParams FIELD_NAME FIELD_TYPE
Returns a hash ref for the bind_param call to identify BLOB types used by the current database for a particular column type. The current
Oracle implementation only supports ORA_CLOB types(112).
ApplyLimits STATEMENTREF ROWS_PER_PAGE FIRST_ROW
takes an SQL SELECT statement and massages it to return ROWS_PER_PAGE starting with FIRST_ROW;
DistinctQuery STATEMENTREF
takes an incomplete SQL SELECT statement and massages it to return a DISTINCT result set.
BinarySafeBLOBs
Return undef, as Oracle doesn't support binary-safe CLOBS
DatabaseVersion
Returns value of ORA_OCI constant, see "Constants" in DBI.
SimpleDateTimeFunctions
Returns hash reference with specific date time functions of this database for "DateTimeFunction" in DBIx::SearchBuilder::Handle.
ConvertTimezoneFunction
Custom implementation of "ConvertTimezoneFunction" in DBIx::SearchBuilder::Handle.
Use the following query to get list of timezones:
SELECT tzname FROM v$timezone_names;
Read Oracle's docs about timezone files:
http://download.oracle.com/docs/cd/B14117_01/server.101/b10749/ch4datetime.htm#i1006667
AUTHOR
Jesse Vincent, jesse@fsck.com
SEE ALSO
perl(1), DBIx::SearchBuilder
perl v5.14.2 2011-09-21 DBIx::SearchBuilder::Handle::Oracle(3pm)