J'utilise tomcat7 avec c3p0-0.9.5.2 et postgresql-9.3-1102-jdbc41, le preferredTestQuery (select 1) n'est jamais utilisé, dans le produit seulement.preferredTestQuery ne jamais utiliser avec c3p0 0.9.5.2 et Tomcat 7
La même configuration fonctionne correctement dans test env (vérifiez avec la requête de mise à jour).
Dans le produit, il y a beaucoup d'appels à la requête getTable postgresql. (> 1000cpm - données New Relic).
<Resource name="jdbc/database_read_only"
auth="Container"
type="com.mchange.v2.c3p0.ComboPooledDataSource"
description="Ma description"
jdbcUrl="jdbc:postgresql://hostname:5432/mabase"
driverClass="org.postgresql.Driver"
user="monuser"
password="monpassword"
initialPoolSize="10"
minPoolSize="10"
maxPoolSize="100"
acquireIncrement="10"
maxIdleTime="300"
maxConnectionAge="1800"
connectionTesterClassName="com.mchange.v2.c3p0.impl.DefaultConnectionTester"
preferredTestQuery="select 2"
testConnectionOnCheckout="true"
testConnectionOnCheckin="false"
idleConnectionTestPeriod="300"
maxIdleTimeExcessConnections="60"
unreturnedConnectionTimeout="10"
factory="org.apache.naming.factory.BeanFactory"/>
Le journal semble bien:
2016-12-23 15:26:10,138 : Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 10, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, contextClassLoaderSource -> caller, dataSourceName -> ddsdsdsqd, debugUnreturnedConnectionStackTraces -> false, description -> ma description, driverClass -> org.postgresql.Driver, extensions -> {}, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, forceSynchronousCheckins -> false, forceUseNamedDriverClass -> false, identityToken -> mytoken, idleConnectionTestPeriod -> 300, initialPoolSize -> 10, jdbcUrl -> jdbc:postgresql://hostname:5432/monapp, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 1800, maxIdleTime -> 300, maxIdleTimeExcessConnections -> 60, maxPoolSize -> 100, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 10, numHelperThreads -> 3, preferredTestQuery -> select 1, privilegeSpawnedThreads -> false, properties -> {user=******, password=******}, propertyCycle -> 0, statementCacheNumDeferredCloseThreads -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> true, unreturnedConnectionTimeout -> 0, userOverrides -> {}, usesTraditionalReflectiveProxies -> false ]
Pourquoi demande c3p0 utilisation et non de complexe "sélectionnez 1"?
échantillon de complexe requete:
SELECT * FROM (SELECT n.nspname,c.relname,a.attname,a.atttypid,a.attnotnull OR (t.typtype = 'd' AND t.typnotnull) AS attnotnull,a.atttypmod,a.attlen,row_number() OVER (PARTITION BY a.attrelid ORDER BY a.attnum) AS attnum, pg_catalog.pg_get_expr(def.adbin, def.adrelid) AS adsrc,dsc.description,t.typbasetype,t.typtype FROM pg_catalog.pg_namespace
SELECT NULL AS TABLE_CAT, n.nspname AS TABLE_SCHEM, c.relname AS TABLE_NAME, CASE n.nspname ~ '^pg_' OR n.nspname = 'information_schema' WHEN true THEN CASE WHEN n.nspname = 'pg_catalog' OR n.nspname = 'information_schema' THEN CASE c.relkind WHEN 'r' THEN 'SYSTEM TABLE' WHEN 'v' THEN 'SYSTEM VIEW' WHEN 'i' THEN 'SYSTEM INDEX' ELSE NULL END WHEN n.nspname = 'pg_toast' THEN CASE c.relkind WHEN 'r' THEN 'SYSTEM TOAST TABLE' WHEN 'i' THEN 'SYSTEM TOAST INDEX' ELSE NULL END ELSE CASE c.relkind WHEN 'r' THEN 'TEMPORARY TABLE' WHEN 'i' THEN 'TEMPORARY INDEX' WHEN 'S' THEN 'TEMPORARY SEQUENCE' WHEN 'v' THEN 'TEMPORARY VIEW' ELSE NULL END END WHEN false THEN CASE c.relkind WHEN 'r' THEN 'TABLE' WHEN 'i' THEN 'INDEX' WHEN 'S' THEN 'SEQUENCE' WHEN 'v' THEN 'VIEW' WHEN 'c' THEN 'TYPE' WHEN 'f' THEN 'FOREIGN TABLE' WHEN 'm' THEN 'MATERIALIZED VIEW' ELSE NULL END ELSE NULL END AS TABLE_TYPE, d.description AS REMARKS FROM pg_catalog.pg_namespace n, pg_catalog.pg_class c LEFT JOIN pg_catalog.pg_description d ON (c.oid = d.objoid AND d.objsubid = 0) LEFT JOIN pg_catalog.pg_class dc ON (d.classoid=dc.oid AND dc.relname='pg_class') LEFT JOIN pg_catalog.pg_namespace dn ON (dn.oid=dc.relnamespace AND dn.nspname='pg_catalog') WHERE c.relnamespace = n.oid AND c.relname LIKE 'availability_table' ORDER BY TABLE_TYPE,TABLE_SCHEM,TABLE_NAME
je prends toutes les idées.
grâce
pourquoi c3p0 n'utilise pas le preferredTestQuery? – julien