Hierarchy
SAP_BASIS (Software Component) SAP Basis Component⤷
BC-DB-DB2 (Application Component) DB2 for z/OS⤷
STU3 (Package) Development Class for Database Monitor
Basic Data
| Data Element | DB2CWP4XLU |
| Short Description | Flag if X lock is Used for Searched Update or Delete |
Data Type
| Category of Dictionary Type | D | Domain |
| Type of Object Referenced | No Information | |
| Domain / Name of Reference Type | DB2CHAR03L | |
| Data Type | CHAR | Character String |
| Length | 3 | |
| Decimal Places | 0 | |
| Output Length | 3 | |
| Value Table |
Further Characteristics
| Search Help: Name | ||
| Search Help: Parameters | ||
| Parameter ID | ||
| Default Component name | ||
| Change document | ||
| No Input History | ||
| Basic direction is set to LTR | ||
| No BIDI Filtering |
Field Label
| Length | Field Label | |
| Short | 0 | |
| Medium | 0 | |
| Long | 24 | X lock for update cursor |
| Heading | 0 |
Documentation
Definition
Specify the locking method used when performing a searched UPDATE or DELETE.
A value of 'No' means DB2 uses an S or U lock when scanning for qualifying rows. For any qualifying rows or pages the lock is upgraded to an X lock before performing the update or delete. For non-qualifying rows or pages the lock is released if using ISOLATION(CS). For ISOLATION(RS) or ISOLATION(RR), an S lock is retained on the rows or pages until the next commit point.
A value of 'Yes' means DB2 gets an X lock on qualifying rows or pages. For ISOLATION(CS), the lock is released if the rows or pages are not updated or deleted. For ISOLATION(RS) or ISOLATION(RR), an X lock is retained until the next commit point. A value of YES is beneficial in a data sharing environment when most or all searched updates and deletes use an index. If YES is specified and searched updates or deletes result in a table space scan, the likelihood of timeouts and deadlocks increases.
In SAP environments recommended value is 'Yes'.
Installation parameter X LOCK FOR SEARCHED U/D on panel DSNTIPI.
Its ZPARM name is XLKUPDLT in DSN6SPRM.
History
| Last changed by/on | SAP | 20070813 |
| SAP Release Created in | 710 |
