The initial pool sizeĪnd the maximum pool size are provided at the time of pool creation. Is generally called during application initialization. This also means that small pools can beĪ connection pool is created by calling SessionPool(). High availability features and is recommended forĪpplications that must be reliable. Implementation uses Oracle’s session pool technology which supports Oracle’s When applications frequently connect and disconnect from the database. Connection pooling is important for performance
connect ( user = "hr", password = userpwd, dsn = "finance", encoding = "UTF-8" ) Connection Pooling ¶Ĭx_Oracle’s connection pooling lets applications create and maintain a pool ofĬonnections to the database. It also supports shardingĬonnection = cx_Oracle. Makedsn() function accepts the database hostname, the port The cx_Oracle.makedsn() function can be used to construct a connectĭescriptor string for the data source name parameter dsn ofĬx_nnect() and cx_Oracle.SessionPool(). This means that a sqlnet.oraįile is not needed for some common connection scenarios. The distinguished name of the database server, and even lets some networkĬonfiguration options be set. Multiple hosts or ports, along with optional entries for the wallet location,
If you are using Oracle Client 19c, the latest Easy Connect Plus syntax allows the use of Oracle Net Service Administrator’s Guide for the syntax to use in your The Easy Connect syntax has been extended in recent versions of Oracle DatabaseĬlient since its introduction in 10g. Used with the older System Identifiers (SID). The Easy Connect syntax supports Oracle Database service names. connect ( user = "hr", password = userpwd, dsn = ":1984/orclpdb1", encoding = "UTF-8" ) Running on the host with the default OracleĬonnection = cx_Oracle. This method does not need configuration filesįor example, to connect to the Oracle Database service orclpdb1 that is Easy Connect Syntax for Connection Strings ¶Īn Easy Connect string is often the simplest connection string to use for theĭata source name parameter dsn of cx_nnect() andĬx_Oracle.SessionPool(). The dsn string can be oneĪ Net Service Name mapping to a connect descriptorįor more information about naming methods, see Oracle Net Service Reference.
Identifying which database service to connect to. The data source name parameter dsn of cx_nnect() andĬx_Oracle.SessionPool() is the Oracle Database connection string Prompt closing of connections is important when using connection pools soĬonnections are available for reuse by other pool users. Use the variable connection outside of the block will simply fail.
This code ensures that, once the block is completed, the connection is closedĪnd resources have been reclaimed by the database. execute ( "insert into SomeTable values (:1, :2)", ( 1, "Some string" )) connection. connect ( user = user, password = password, dsn = "/orclpdb1", encoding = "UTF-8" ) as connection : cursor = connection. These include limiting the amount of time that opening a connection can take, orĮxample: Standalone Connection to Oracle Database Settings can be configured in Optional Oracle Net Configuration Files or in Optional Oracle Client Configuration Files. Many connection behaviors can be controlled by cx_Oracle options. Initialization time, and then SessionPool.acquire() can be called to Pools are created with cx_Oracle.SessionPool() at application Useful for applications that want a few connections available for infrequent Recommended for applications that must be reliable. Support Oracle’s high availability features and are Connections are created byĬonnection pooling is important for performance whenĪpplications frequently connect and disconnect from the database. These are useful when the application maintains a single user There are two ways to connect to Oracle Database using cx_Oracle: Connections between cx_Oracle and Oracle Database are used for executing