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SQL Anywhere 11.0.1 (Français) » SQL Anywhere Server - SQL Reference » System Objects » System procedures » Alphabetical list of system procedures

 

sa_snapshots system procedure

Returns a list of snapshots that are currently active.

Syntax
sa_snapshots( )
Result set
Column name Data type Description
connection_num INT The connection ID for the connection on which the snapshot is running.
start_sequence_num UNSIGNED BIGINT A unique number that identifies the snapshot.
statement_level BIT True if the snapshot was created with statement-snapshot or readonly-statement-snapshot. Otherwise, false.
Remarks

Several statement snapshots can exist on one connection. In the case of nested or interleaved statements running under statement snapshot isolation levels, each one begins a different statement snapshot with its first read or update.

Usually there is only one transaction snapshot per connection (one entry per connection in sa_snapshots with statement_level=0). However, a snapshot associated with a cursor never changes after the cursor's first fetch and a cursor opened WITH HOLD stays open through a commit or rollback. If the cursor has an associated snapshot, then the snapshot also persists. Therefore, it is possible for multiple transaction snapshots to exist for the same connection_num: one for the current transaction snapshot and one or more for old transaction snapshots that persist because of WITH HOLD cursors.

Permissions

DBA authority required

Side effects

None

See also