diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/access/nbtree/README | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/src/backend/access/nbtree/README b/src/backend/access/nbtree/README index 3d01b7854df..dce8bc98e93 100644 --- a/src/backend/access/nbtree/README +++ b/src/backend/access/nbtree/README @@ -65,10 +65,7 @@ copies of tree pages are unshared. Postgres shares in-memory buffers among backends. As a result, we do page-level read locking on btree pages in order to guarantee that no record is modified while we are examining it. This reduces concurrency but guarantees correct -behavior. An advantage is that when trading in a read lock for a -write lock, we need not re-read the page after getting the write lock. -Since we're also holding a pin on the shared buffer containing the -page, we know that buffer still contains the page and is up-to-date. +behavior. We support the notion of an ordered "scan" of an index as well as insertions, deletions, and simple lookups. A scan in the forward |