For data-only-locked tables, the effects of readpast on a table in a select command are shown in Table 23-1.
Session Isolation Level |
Effects |
|---|---|
0, read uncommitted (dirty reads) |
readpast is ignored, and rows containing uncommitted transactions are returned to the user. A warning message is printed. |
1, read committed |
Rows or pages with incompatible locks are skipped; no locks are held on the rows or pages read. |
2, repeatable read |
Rows or pages with incompatible locks skipped; shared locks are held on all rows or pages that are read until the end of the statement or transaction. |
3, serializable |
readpast is ignored, and the command executes at level 3. The command blocks on any rows or pages with incompatible locks. |
