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oci8.connection_class
string
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This user defined text is used by Oracle 11g Database
Resident Connection Pooling (DRCP) connections to
sub-partition the connection pool. It allows OCI8 persistent
connections from an application to reuse database sessions
from a previous PHP script, giving better scalability. When
an application uses a database pooled process previously used
with a different connection class, the session settings such
as the default Oracle date format are reset. This prevents
accidental sharing of information between different
applications.
The value can be set at runtime
with ini_set() prior to connecting.
To use DRCP, OCI8 must be linked with Oracle 11g libraries
and the database must be Oracle 11g. The connection pool
must be enabled in the database,
the oci8.connection_class should be set to
the same string for all web servers running the same
application, and the OCI8 connection string must specify to
use a pooled server.
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oci8.default_prefetch
int
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This option sets the default number of extra rows that will
be fetched and cached automatically whenever a low-level
request for data from the database is made. Setting a value
of 0 turns off prefetching.
The prefetch value does not alter the number of rows that
functions like oci_fetch_array() return to
the user; the prefetching and caching of rows is handled
internally in OCI8.
The value can be set per-statement
with oci_set_prefetch() prior to statement
execution.
In PHP 5.3 (PECL OCI8 1.3.4) the default value was increased
from 10 to 100.
In PHP 5.3.2 (PECL OCI8 1.4) the minimum value settable was
reduced from 1 to 0,
allowing prefetching to be turned off.
When using Oracle Database 12c, the prefetch
value set by PHP can be overridden by Oracle's
client oraaccess.xml configuration file. Refer
to Oracle documentation for more detail.
Note:
A larger prefetch can result in improved performance, at the
cost of some increased memory usage. For queries that return
large amounts of data, the performance benefit can be
significant.
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oci8.events
boolean
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Using On allows PHP to be notified of
database Fast Application Notification (FAN) events.
Without FAN, when a database instance or machine node fails
unexpectedly, PHP applications may be blocked waiting for a
database response until a TCP timeout expires. With FAN
events, PHP applications are quickly notified of failures
that affect their established database connections. The OCI8
extension will clean up unusable connections in the
persistent connection cache.
When using On, the database must also be
configured to post FAN events.
FAN support is available when OCI8 is linked with Oracle
10gR2 (or later) libraries and connected to Oracle Database
10gR2 (or later).
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oci8.max_persistent
int
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The maximum number of persistent OCI8 connections per PHP
process. Setting this option to -1 means that there is no
limit.
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oci8.old_oci_close_semantics
boolean
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This option controls oci_close() behaviour.
Enabling it means that oci_close() will do
nothing; the connection will not be
closed until the end of the script. This is for backward
compatibility only. If you find that you need to enable this
setting, you are strongly encouraged to
adjust the oci_close() calls in your
application instead of enabling this option.
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oci8.persistent_timeout
int
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The maximum number of seconds that a PHP process is allowed
to keep an idle persistent connection open. Setting this
option to -1 means that idle persistent connections will be
retained until the PHP process terminates or the connection
is explicitly closed with oci_close().
Note:
In PHP, the expiry of idle resources is not alarm-based. It
occurs when PHP finishes processing a script and checks the
last-used timestamp of resources. Hence there is a paradox
that idle connections can only be closed when there is some
activity (though not necessarily OCI8 related) in the PHP
process. If there is more than one PHP process then each
must individually be activated in order to trigger expiry of
its idle resources. The introduction of Database Resident
Connection Pooling (DRCP) in Oracle 11g resolves the memory
and resource issues
that oci8.max_persistent
and oci8.persistent_timeout previously
attempted to overcome.
Note:
In PHP 5.3 (PECL OCI8 1.3), persistent connections can be
closed with oci_close().
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oci8.ping_interval
int
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The number of seconds that must pass before issuing a ping
during oci_pconnect(). A ping ensures
that the database connection is valid. When set to 0,
persistent connections will be pinged every
time oci_pconnect() is called. To disable
pings completely, set this option to -1.
Note:
Disabling pings allows oci_pconnect() to
operate at the highest efficiency, but PHP may not be able
to detect unusable connections, such as caused by network
dropout, or if the Oracle database has gone down since PHP
connected, until the connection is used later in the
script. Consult the
oci_pconnect() documentation for more information.
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oci8.privileged_connect
boolean
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This option allows connections to use the privileged external
credentials
OCI_SYSOPER or OCI_SYSDBA.
Note:
Seting this On can allow scripts on web
servers running with the appropriate OS user privileges to
connect as privileged database users without requiring a
database password. This can be a security risk.
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oci8.statement_cache_size
int
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This option enables statement caching, and specifies how many
statements to cache. To disable statement caching just set
this option to 0.
Statement caching removes the need to transmit the statement
text to the database and removes the need to transmit any
meta data about the statement back to PHP. This can
significantly improve overall system performance in
applications which reuse statements during the lifetime of a
connection. Some extra database "cursors" may be
held open under the assumption that statements will be
reused.
Set this value to the size of the working set of statements
used by your application. Setting too small a value can cause
statements to be flushed from the cache before they are
reused.
This option is of most use with persistent connections.
When using Oracle Database 12c, this
value can be overridden and automatically tuned by Oracle's
client oraaccess.xml file. Refer to
Oracle documentation for more detail.