[Postgresql]Explain plan analyzer
Analyser un explain plan
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Analyser un explain plan
PoWA (PostgreSQL Workload Analyzer) is a performance tool for PostgreSQL 9.4 and newer allowing to collect, aggregate and purge statistics on multiple PostgreSQL instances from various Stats Extensions.
postgres=> dtvsi+
List of relations
Schema | Name | Type | Owner | Table | Size | Description
Exemple de création d'un rôle R/W avec les privileges.
select nspname
from pg_catalog.pg_namespace where nspname not like 'pg%' and nspname <> 'information_schema';
WITH "names"("name") AS (
SELECT n.nspname AS "name"
FROM pg_catalog.pg_namespace n
WHERE n.nspname !~ '^pg_'
AND n.nspname <> 'information_schema'
) SELECT "name",
pg_catalog.has_schema_privilege(current_user, "name", 'CREATE') AS "create",
pg_catalog.has_schema_privilege(current_user, "name", 'USAGE') AS "usage"
FROM "names";
Privs useful to any new user created.
#se connecter au serveur target
psql -U <muyser>
CREATE EXTENSION oracle_fdw;
dew
CREATE SERVER orasrv FOREIGN DATA WRAPPER oracle_fdw (dbserver '<servername>:<port>/<SID>');
des+
GRANT USAGE ON FOREIGN SERVER orasrv TO <muyser>;
CREATE USER MAPPING FOR <muyser> SERVER orasrv OPTIONS ( USER '<oracle_user>', PASSWORD 'xxxx');
deu+
CREATE FOREIGN TABLE ext_<ORATBL> ( id int OPTIONS (key 'true'), name varchar(64), t_data timestamp) SERVER orasrv OPTIONS (SCHEMA '<ORAUSER>' , TABLE '<ORATBL>');
tuto : https://www.postgresql.fastware.com/postgresql-insider-fdw-ora-bas
Pré requis :
- avoir une VM avec postgresql d'installé sur le meme VLAN qu'une base oracle avec Oracle instantclient-basic, instantclient-devel d'installé
- Ensure that pg_config is in your path, and ORACLE_HOME as well as LD_LIBRARY_PATH are configured
- avoir accès au compte postgres dans la bdd
- avoir accès à une base oracle en sysdba
- The <oracle_user> will obviously need CREATE SESSION privilege and the right to select from the table or view in question.
Bon à savoir : If a NUMBER is converted to a boolean, 0 means false, everything else true.