HP Integrity NonStop H-Series Betriebsanweisung PDF herunterladen (Seite 243)

HP NonStop Shadowbase Command Definitions

Database Specification Command Descriptions

HP NonStop Shadowbase Command Reference Manual—785421-002

234

[NOSTOPONMISSING |

STOPONMISSING]

[BUFFERED | WRITETHRUCACHE]

defaults when ENTRYSEQEXACT is ON are:

DELAYFLUSH

PROTECTEDOPEN

NOWARNONMISSING

STOPONMISSING

WRITETHRUCACHE

Initial Changed

Version Version Values Default Value Specificatons Alter

5.002 OFF Valid ENTRYSEQEXACT No

options

For Enscribe entry-sequenced replication, when set ON,

ENTRYSEQEXACT provides a mode of replication that uses

unaudited/unstructured block oriented I/O to maintain a target copy of a

non-partitioned or partitioned file. Generally, the target file should be

created exactly the same as the source file. Note that this mode of

replication does not result in I/O to the alternate key files. It only does I/O

to the base file partitions.

Available Entryseqexact Options:

NODELAYFLUSH or DELAYFLUSH – NODELAYFLUSH causes the

CONS to flush a block to disk each time a block is changed (for every

I/O event). DELAYFLUSH causes the CONS to delay the flush of a

block, resulting in better performance and throughput. Blocks are

flushed to disk when on I/O event causes access to a different block

than the one currently being modified (with inserts, updates, deletes)

and prior to a reply message back to the COLL which can cause the

COLL’s audit restart reading position to advance.

EXCLUSIVEOPEN or PROTECTEDOPEN – EXCLUSIVEOPEN causes

the CONS to open the target file exclusively. PROTECTEDOPEN will

allow the file to be opened for read-only access while the CONS has

the file opened for replication. EXCLUSIVEOPEN will not permit any

access to the file while the CONS has it open.

NOWARNONMISSING or WARNONMISSING – It is possible that blocks

(records) can be missing in a target if replication for a given file does

not start with the first event or the restart position is altered to skip

audit trail data. If NOSTOPONMISSING is configured and

WARNONMISSING is configured, the CONS will report the condition to

EMS if it is detected. It will not report the condition to EMS if

NOWARNINGONMISSING is configured.

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