O – glossary entries

ODBR: See online database reorganization (ODBR).
object: An instantiation of an object class. A coupling facility (CF) list structure or a connection to a CF list structure.
object file: In the z/TPF system, a compiler or assembler output file that is suitable as input to a linker.
object handle (Hobj): The identifier or token by which a program accesses the z/TPF MQSeries® object with which it is working.
object header: A header that contains an object ID, update sequence counter, and object length.
object ID: A field containing the hexadecimal class ID of the object. When you find an object in a record using the ZDFIL command, you can determine what class or type of object it is from this class ID. The class IDs of all the objects used by z/TPF collection support (z/TPFCS) are defined by CLASSID macro statements in the ITO2 copy segment.
object length: A field containing the length of an object when it is brought into memory by z/TPF collection support (z/TPFCS) to process its associated persistent collection.
OCR: Open Systems Adapter (OSA) configuration record.
octal: A base 8 numbering system.
offline ACF/SNA table generation (OSTG): A function that creates the tables used online to define and control the ACF/SNA network.
offline alternate FACE table (FCTB) load: The offline load of the alternate FCTB loader. This load is performed using the offline loader and specifying the TLDR parameter with the TPFLDR program on z/OS® or the offline loader command on Linux®. See also online alternate face table (FCTB) load and alternate face table (FCTB) loader.
offline E-type load: The offline load of the E-type loader. This load is performed by the offline loader using the OLDR parameter. See also online E-type load and E-type loader.
offline functions: See offline system.
offline general file load: The offline load of the general file loader. This load is performed by the offline loader using the ALDR parameter. See also online general file load and general file loader.
offline image load: The offline load of the image loader. This load is performed by the offline loader using the TLDR parameter. See also online image load and image loader.
offline loader: The program (TPFLDR on z/OS or offldr on Linux) that performs the offline load for the general file loader (using the ALDR parameter), the image loader (using the TLDR parameter), the E-type loader (using the OLDR parameter), and the alternate FACE table (FCTB) loader. See also alternate face table (FCTB) loader, offline E-type load, offline general file load, and offline image load.
offline multiple release: A multiple release where pool directory update (PDU) processing was not run between two or more releases of a pool address. See also multiple release and online multiple release.
offline system: The batch-oriented z/OS programs that support the online z/TPF system.
offload device: A device that performs well-defined interface services to free the host processor to perform other tasks.
OLD: A symbolic name, reserved to the z/TPF system, for a general tape denoting the load medium to be used by the E-type loader function.
OMT: Output message transmitter.
online alternate FACE table (FCTB) load: The online load of the alternate FCTB loader. This load is performed using the ZFCTB LOAD command. See also offline alternate face table (FCTB) load and alternate face table (FCTB) loader.
online database reorganization (ODBR): A utility that provides the capability to expand, contract, or reorganize an online z/TPF database with minimum requirements for a complex-wide outage.
online E-type load: The online load of the E-type loader. This load is performed using the ZOLDR command. See also offline E-type load and E-type loader.
online general file load: The online load of the general file loader. This load is performed by the ACPL program. See also offline general file load and general file loader.
online image load: The online load of the image loader. This load is performed using the ZTPLD command. See also offline image load and image loader.
online loader: See general file loader, image loader, alternate face table (FCTB) loader, or E-type loader.
online multiple release: A multiple release where pool directory update (PDU) processing was run between two or more releases of a pool address. See also multiple release and offline multiple release.
online system: The z/TPF production system.
on-time event: The signal generated by a Sysplex Timer that verifies time-of-day (TOD) synchronization in the CPC.
operational program zero (OPZERO): The program that creates an entry control block (ECB), defines an entry, and therefore introduces new message information into the system for processing. It is activated when the CPU loop dispatches a work item from the input list.
OPR dump: The dump generated when an entry control block (ECB)-controlled program detects an error condition that does not necessarily stop the ECB from continuing its processing.
optimistic concurrency: In z/TPF collection support (z/TPFCS), a way of controlling data access. Optimistic concurrency allows a user to read a collection, update it, and replace it without requiring exclusive access to the collection.
OPZERO: Operational program zero.
ordinal number: For a symbolic file address, the relative position of a record in a record type.
OSA configuration record (OCR): A record consisting of two tables, the Open Systems Adapter (OSA) definition table and the OSA Internet Protocol (IP) address table, that contain the definitions and status of OSA-Express connections.
OSA control block: A control block that contains one entry for each active OSA-Express connection.
OSA definition table: A table in the Open Systems Adapter (OSA) configuration record that contains the definitions and status of the OSA-Express connections.
OSA-Express adapter: Integrated hardware that uses queued direct I/O (QDIO) to communicate with high-bandwidth networks. See also Network Express adapter.
OSA-Express connection: The z/TPF interface to an OSA-Express adapter or a Network Express adapter within the processor.
OSA input message list: A shared CPU loop list that is used to process input messages that arrive on the network from an OSA-Express connection. The CPU loop checks this list after ready list processing has been completed. See also cross list, deferred list, input list, low priority utility list, ready list, suspend list, time dispatch list, and virtual file access count (VCT) list.
OSA IP address table: A table in the Open Systems Adapter (OSA) configuration record that contains the definitions and status of the Internet Protocol (IP) addresses associated with OSA-Express connections.
OSA shared IP address table (OSIT): A table that contains the status of all Open Systems Adapter (OSA) Internet Protocol (IP) addresses in a loosely coupled z/TPF complex.
OSIT: Open Systems Adapter (OSA) shared Internet Protocol (IP) address table.
OSTG: Offline ACF/SNA table generation.
out-of-band: The MSG_OOB flag can be set on stream sockets for calls such as send, recv, and recvfrom. The MSG_OOB flag is set for high priority data. Flagged data, which is 1 byte long, may be sent inline with other data or as a single byte by itself. If flagged data is sent inline, it is marked to be read in a specific sequence in relation to the other inline data.
output command handler: A main storage resident program that transmits queued SNA commands.
output message transmitter (OMT): The program that queues and initiates output message transmission to terminals in an ACF/SNA network.
owner name: An identifier that is used to associate blocks of storage with certain users.
owning clock processor: The processor that controls the TOD time and date changes of the complex in a loosely coupled system. The owning clock processor is usually the first active processor in a loosely coupled system. In 1052 state, the processor where the ZATIM command with the TOD parameter specified is entered becomes the owning clock processor.