diff options
| -rw-r--r-- | contrib/pageinspect/expected/gist.out | 10 | ||||
| -rw-r--r-- | contrib/pageinspect/sql/gist.sql | 12 |
2 files changed, 22 insertions, 0 deletions
diff --git a/contrib/pageinspect/expected/gist.out b/contrib/pageinspect/expected/gist.out index 508f5adb550..5f7d8cea71b 100644 --- a/contrib/pageinspect/expected/gist.out +++ b/contrib/pageinspect/expected/gist.out @@ -1,3 +1,12 @@ +-- The gist_page_opaque_info() function prints the page's LSN. Normally, +-- that's constant 1 (GistBuildLSN) on every page of a freshly built GiST +-- index. But with wal_level=minimal, the whole relation is dumped to WAL at +-- the end of the transaction if it's smaller than wal_skip_threshold, which +-- updates the LSNs. Wrap the tests on gist_page_opaque_info() in the +-- same transaction with the CREATE INDEX so that we see the LSNs before +-- they are possibly overwritten at end of transaction. +BEGIN; +-- Create a test table and GiST index. CREATE TABLE test_gist AS SELECT point(i,i) p, i::text t FROM generate_series(1,1000) i; CREATE INDEX test_gist_idx ON test_gist USING gist (p); @@ -20,6 +29,7 @@ SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist_idx', 2)); 0/1 | 0/0 | 1 | {leaf} (1 row) +COMMIT; SELECT * FROM gist_page_items(get_raw_page('test_gist_idx', 0), 'test_gist_idx'); itemoffset | ctid | itemlen | keys ------------+-----------+---------+------------------- diff --git a/contrib/pageinspect/sql/gist.sql b/contrib/pageinspect/sql/gist.sql index e6f6e42a5ef..1560d1e15c3 100644 --- a/contrib/pageinspect/sql/gist.sql +++ b/contrib/pageinspect/sql/gist.sql @@ -1,3 +1,13 @@ +-- The gist_page_opaque_info() function prints the page's LSN. Normally, +-- that's constant 1 (GistBuildLSN) on every page of a freshly built GiST +-- index. But with wal_level=minimal, the whole relation is dumped to WAL at +-- the end of the transaction if it's smaller than wal_skip_threshold, which +-- updates the LSNs. Wrap the tests on gist_page_opaque_info() in the +-- same transaction with the CREATE INDEX so that we see the LSNs before +-- they are possibly overwritten at end of transaction. +BEGIN; + +-- Create a test table and GiST index. CREATE TABLE test_gist AS SELECT point(i,i) p, i::text t FROM generate_series(1,1000) i; CREATE INDEX test_gist_idx ON test_gist USING gist (p); @@ -7,6 +17,8 @@ SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist_idx', 0)); SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist_idx', 1)); SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist_idx', 2)); +COMMIT; + SELECT * FROM gist_page_items(get_raw_page('test_gist_idx', 0), 'test_gist_idx'); SELECT * FROM gist_page_items(get_raw_page('test_gist_idx', 1), 'test_gist_idx') LIMIT 5; |