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Top Forums Programming Oracle 11g optimizer best join order question Post 302962826 by durden_tyler on Friday 18th of December 2015 08:29:48 PM
Old 12-18-2015
Mathematically, the total number of permutations for joining 9 tables would be 9! or 362880.
However, the parameters - optimizer_max_permutations and optimizer_search_limit are undocumented (deprecated) in Oracle version 10g and higher.

Oracle hasn't mentioned or documented the algorithm it uses to derive the value, so I wouldn't rely too much on that number.

Besides, since they are deprecated: (a) use them at your own risk and (b) Oracle will not provide any support in case you run into problems using them.

Last edited by durden_tyler; 12-18-2015 at 11:47 PM..
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OCI_SET_CLIENT_INFO(3)													    OCI_SET_CLIENT_INFO(3)

oci_set_client_info - Sets the client information

SYNOPSIS
bool oci_set_client_info (resource $connection, string $client_info) DESCRIPTION
Sets the client information for Oracle tracing. The client information is registered with the database when the next 'roundtrip' from PHP to the database occurs, typically when an SQL statement is executed. The client information can subsequently be queried from database administration views such as V$SESSION. The value may be retained across persistent connections. PARAMETERS
o $connection -An Oracle connection identifier, returned by oci_connect(3), oci_pconnect(3), or oci_new_connect(3). o $client_info - User chosen string up to 64 bytes long. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 Setting the client information <?php $c = oci_connect('hr', 'welcome', 'localhost/XE'); // Record the client information oci_set_client_info($c, 'My Application Version 2'); // Code that causes a roundtrip, for example a query: $s = oci_parse($c, 'select * from dual'); oci_execute($s); oci_fetch_all($s, $res); sleep(30); ?> // While the script is running, the administrator can see the client // information: sqlplus system/welcome SQL> select client_info from v$session; NOTES
Note Oracle version requirement This function is available when PHP is linked with Oracle Database libraries from version 10 g onwards. Tip Performance With older versions of OCI8 or the Oracle Database, the client information can be set using the Oracle DBMS_APPLICATION_INFO pack- age. This is less efficient than using oci_set_client_info(3). Caution Roundtrip Gotcha Some but not all OCI8 functions cause roundtrips. Roundtrips to the database may not occur with queries when result caching is enabled. SEE ALSO
oci_set_module_name(3), oci_set_action(3), oci_set_client_identifier(3). PHP Documentation Group OCI_SET_CLIENT_INFO(3)
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