Erreur oci_execute() avec une base Oracle

Bonjour je dois corriger des erreurs sur un site fait en PHP à mon boulot et je tombe sur ce message d'erreur, Connaissez -vous une solution à ce problème s'il vous plaît ?

Warning: oci_execute() [function.oci-execute]: ORA-02068: following severe error from STATDBA ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist SVR4 Error: 2: No such file or directory in "/.../.../"exe_sql.php on line 230

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function query($query)
		{
 
			// For reg expressions
			$query = trim($query); 
 
			$return_value = 0;
 
			// Flush cached values..
			$this->flush();
 
			// Log how the function was called
			$this->func_call = "\$db->query(\"$query\")";
 
			// Keep track of the last query for debug..
			$this->last_query = $query;
 
			// Parses the query and returns a statement..
			if ( ! $stmt = OCIParse($this->dbh, $query))
			{
				$this->print_error("Last Query",$query);
			}
 
			// Execut the query..
			else if ( ! $this->result = oci_execute($stmt))
			{
				$this->print_error("Last Query",$query);		
			}
 
			$this->num_queries++;
 
			// If query was an insert
			if ( preg_match('/^(insert|delete|update|create)\s+/i', $query) )
			{
				// num afected rows
				$return_value = $this->rows_affected = OCIRowCount($stmt);
			}
			// If query was a select
			else
			{
 
				// Get column information
				if ( $num_cols = @OCINumCols($stmt) )
				{
					// Fetch the column meta data
	    			for ( $i = 1; $i <= $num_cols; $i++ )
	    			{
	    				$this->col_info[($i-1)]->name = OCIColumnName($stmt,$i);
	    				$this->col_info[($i-1)]->type = OCIColumnType($stmt,$i);
	    				$this->col_info[($i-1)]->size = OCIColumnSize($stmt,$i);
				    }
				}
 
				// If there are any results then get them
				if ($this->num_rows = @OCIFetchStatement($stmt,$results))
				{
					// Convert results into object orientated results..
					// Due to Oracle strange return structure - loop through columns
					foreach ( $results as $col_title => $col_contents )
					{
						$row_num=0;
						// then - loop through rows
						foreach (  $col_contents as $col_content )
						{
							$this->last_result[$row_num]->{$col_title} = $col_content;
							$row_num++;
						}
					}
				}
 
				// num result rows
				$return_value = $this->num_rows;
			}
 
			// If debug ALL queries
			$this->trace || $this->debug_all ? $this->debug() : null ;
 
			return $return_value;
 
		}

La ligne concerné par cette erreur est:

Code:

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else if ( ! $this->result = oci_execute($stmt))

Merci d'avance pour votre aide !