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SQLLDR can also support the loading of a structured data file that points to another, single data file. We can tell SQLLDR how to parse LOB data from this other file, so that each row in the structured data gets loaded with a piece of it. I find this mode to be of limited use (in fact, I ve never found a use for it to date), and I will not discuss it here. SQLLDR refers to these externally referenced files as complex secondary data files. LOBFILES are relatively simple data files aimed at facilitating LOB loading. The attribute that distinguishes LOBFILEs from the main data files is that in LOBFILEs, there is no concept of a record, hence newlines never get in the way. In LOBFILEs, the data is in any of the following formats: Fixed-length fields (e.g., load bytes 100 through 1000 from the LOBFILE) Delimited fields (terminated by something or enclosed by something) Length/value pairs, a variable-length field

10.5.1 Understanding JAAS-based authorization While the exact way you use JAAS will depend on your system s access control requirements, a typical way to use it to perform authorization requires that you follow these steps:

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ORGANIZATION external ( TYPE oracle_loader DEFAULT DIRECTORY SYS_SQLLDR_XT_TMPDIR_00000 The ORGANIZATION EXTERNAL clause tells Oracle this is not a normal table We saw this clause before in 10 when we looked at IOTs Currently there are three organization types: HEAP for a normal table, INDEX for an IOT, and EXTERNAL for an external table The rest of the text starts to tell Oracle more about the external table The ORACLE_LOADER type is one of two supported types (in Oracle9i it is the only supported type) The other type is ORACLE_ DATAPUMP, the proprietary Data Pump format used by Oracle in Oracle 10g and later We will take a look at that type in a subsequent section on data unloading it is a format that can be used to both load and unload data.

The most common of these types is the delimited fields ones that are terminated by an end-of-file (EOF), in fact. Typically, you have a directory full of files you would like to load into LOB columns, and each file in its entirety will go into a BLOB. The LOBFILE statement with TERMINATED BY EOF is what you will use. So, let s say we have a directory full of files we would like to load into the database. We would like to load the OWNER of the file, the TIME_STAMP of the file, the NAME of the file, and the file itself. The table we would load into would be created as follows: ops$tkyte@ORA11GR2> create table lob_demo 2 ( owner varchar2(255), 3 time_stamp date, 4 filename varchar2(255), 5 data blob 6 ) 7 / Table created. Using a simple ls l on UNIX, and dir /q /n on Windows, and capturing that output, we can generate our input file and load it using a control file such as this on UNIX: LOAD DATA INFILE * REPLACE INTO TABLE LOB_DEMO ( owner position(17:25), time_stamp position(44:55) date "Mon DD filename position(57:100), data LOBFILE(filename) TERMINATED ) BEGINDATA -rw-r--r-1 tkyte tkyte 1220342 -rw-rw-r-1 tkyte tkyte 10 -rw-rw-r-1 tkyte tkyte 751 -rw-rw-r-1 tkyte tkyte 491 -rw-rw-r-1 tkyte tkyte 283 -rw-rw-r-1 tkyte tkyte 231 -rw-rw-r-1 tkyte tkyte 235 -rw-rw-r-1 tkyte tkyte 1649 -rw-rw-r-1 tkyte tkyte 1292 -rw-rw-r-1 tkyte tkyte 909

An external table may be used both to create a Data Pump format file and to subsequently read it The very next section we encounter is the ACCESS PARAMETERS section of the external table Here we describe to the database how to process the input file As you look at this, you should notice the similarity to a SQLLDR control file; this is no accident For the most part, SQLLDR and external tables use very similar syntax ACCESS PARAMETERS ( RECORDS DELIMITED BY NEWLINE CHARACTERSET WE8ISO8859P1 BADFILE 'SYS_SQLLDR_XT_TMPDIR_00000':'demo1bad' LOGFILE 'demo1.

Perform authentication The system first needs to authenticate the user using a login or any suitable mechanism. Then it must obtain a verified subject from the authentication subsystem. The Subject class encapsulates information about a single entity, such as its identification and credentials. All subsequent operations that require authorization must check that this subject has sufficient credentials to access the operations. Create an action object JAAS requires that each method that needs an authorization check be encapsulated in an action object. This object must implement either PrivilegedAction or PrivilegedExceptionAction . Both interfaces contain just one method: run(). The only difference is that the run() method has no exception declaration in the former interface, whereas in the latter, it declares that it may throw an exception of type Exception. In either case, the run() method needs to execute the intended operation. Execute the action object The action object we just created needs to be executed on behalf of the authenticated subject using static methods in

HH24:MI", BY EOF Jun Jul Jul Jul Jul Jul Apr Jul Jul Jul 17 16 16 16 16 16 28 16 16 16 15:26 16:38 16:36 16:38 16:38 16:38 18:03 16:36 16:38 16:38 classes12.zip foo.sql t.ctl testa.sql testb.sql test.sh test.sql t.log uselast.sql userbs.sql

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