akorotkov

import numpy as np
import faiss
import seaborn as sns
import pandas as pd

# seed RNG for reproducible result
np.random.seed(1234)

nlist = 30

akorotkov

CREATE TABLE test (
    id integer primary key,
    value1 float8 not null,
    value2 float8 not null,
    value3 float8 not null,
    value4 float8 not null,
    ts timestamp not null
);

CREATE INDEX test_value1_idx ON test (value1);

akorotkov

CREATE OR REPLACE FUNCTION int4_to_bytea(int8) RETURNS bytea AS
$BODY$
    SELECT set_byte(' '::bytea, 0, ($1 % 256)::int4) ||
           set_byte(' '::bytea, 0, (($1 / 256) % 256)::int4) ||
           set_byte(' '::bytea, 0, (($1 / 65536) % 256)::int4) ||
           set_byte(' '::bytea, 0, (($1 / 16777216)  % 256)::int4);
$BODY$
LANGUAGE sql;

CREATE OR REPLACE FUNCTION int2_to_bytea(int4) RETURNS bytea AS

akorotkov

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Draw psql output as iTerm2 v3 inline graph using matplotlib
# Author: Alexander Korotkov <a.korotkov@postgrespro.ru>

import sys
import re
import warnings
import matplotlib
matplotlib.use("Agg")

akorotkov

diff --git a/pg_stat_kcache.c b/pg_stat_kcache.c
index 63fb4ec..0328209 100644
--- a/pg_stat_kcache.c
+++ b/pg_stat_kcache.c
@@ -152,7 +152,7 @@ _PG_init(void)
     * Define (or redefine) custom GUC variables.
     */
    RequestAddinShmemSpace(pgsk_memsize());
-   RequestAddinLWLocks(1);
+   RequestNamedLWLockTranche("pg_stat_kcache", 1);

akorotkov

CREATE TABLE journal (
    id      SERIAL PRIMARY KEY,
    dt      TIMESTAMP NOT NULL,
    level   INTEGER,
    msg     TEXT
);
CREATE INDEX journal_dt_idx ON journal (dt);
SELECT create_parent('public.journal', 'dt', 'time', 'daily', NULL, 290, NULL, '2016-01-01');
INSERT INTO journal (dt, level, msg)
SELECT g, random()*6, md5(g::text)