What persistence manager are you using? Our tests indicate that the stock persistence managers are a significant bottleneck for both writes and also initial reads to load the transient store (on the order of .5 seconds per node when using a remote database like MSSQL or Oracle).
The stock db persistence managers have all methods marked as "synchronized", which blocks on the classdef (which means that even different persistence managers for different workspaces will serialize all load, exists and store operations). Presumably this is because they allocate a JDBC connection at startup and use it throughout, and the connection object is not multithreaded. This problem isn't as noticeable when you are using embedded Derby and reading/writing to the file system, but when you are doing a network operation to a database server, the network latency in combination with the serialization of all database operations results in a significant performance degradation. The new bundle persistence manager (which isn't yet in SVN) improves things dramatically since it inlines properties into the node, so loading or persisting a node is only one operation (plus the additional connection for the LOB) instead of one for the node and and one for each property. The bundle persistence manager also uses prepared statements and keeps a PM-level cache of nodes (with properties) and also non-existent nodes (which permits many exists() calls to return without accessing the database). Changing all db persistence managers to use a datasource and get and release connections inside of load, exists and store operations and eliminating the method synchronization is a relatively simple change that further improves performance for connecting to database servers. There is a persistence manager with an ASL license called "DataSourcePersistenceManager" which seems to the PM of choice for people using Magnolia (which is backed by Jackrabbit). It also uses prepared statements and eliminates the current single-connection issues associated with all of the stock db PMs. It doesn't seem to have been submitted back to the Jackrabbit project. If you Google for "com.iorgagroup.jackrabbit.core.state.db.DataSourcePersistenceManager" you should be able to find it. Finally, if you always use the Oracle 10g JDBC drivers, you do not need to use the Oracle-specific PMs because the 10g drivers support the standard BLOB API (in addition to the Oracle-specific BLOB API required by the older 9i drivers). This is true even if you are connecting to an older database server as the limitation was in the driver itself. Frankly you should never use the 9i drivers as they are pretty buggy and the 10g drivers represent a complete rewrite. Make sure you use the new driver package because the 10g driver JAR also includes the older 9i drivers for backward-compatibility. The new driver is in a new package (can't remember the exact name off the top of my head). Bryan. _______________________________________________________________________ Notice: This email message, together with any attachments, may contain information of BEA Systems, Inc., its subsidiaries and affiliated entities, that may be confidential, proprietary, copyrighted and/or legally privileged, and is intended solely for the use of the individual or entity named in this message. If you are not the intended recipient, and have received this message in error, please immediately return this by email and then delete it.
