the impact of multitenant architecture in the develop of java within the rdbms
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Experiences with Evangelizing Java Within the Database
The impact of MultiTenant Architecture in the develop of Java within the RDBMS
The impact of MultiTenant Architecture in the develop of Java within the RDBMS
About
● About me– CTO at Scotas.com
– Founder of the ArOUG
– ACE Member since 2006
– Open Source Developer (DBPrism/ DBPrism CMS, LDI, ...)
– Oracle developer since 1999
● About Scotas– A company specialized in free text search, synchronization
and Oracle
– OLS, Native Solr integration
– External Solr/ ElasticSearch integration
www.scotas.com
www.scotas.com
Agenda
– Database resident JVM
– History of the JVM implementation
– Multitenant Architecture● Process● Storage● OS resources
– Conclusion
Database resident JVM time-line
● 8i (1999, JDK1.2, JSP, ORB, NCOMP)● 9i (2001, JDK 1.3, NCOMP)● 10g (2003 R1, 2005 R2, JDK 1.4, NCOMP)● 11g (2007, JDK 1.5, JIT)● 12c (2013, JDK 1.6/1.7/.., JIT)
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Sun’s JDK versus Database resident JVM
Sun’s JDK VM● Thread Based
● Sharing across Threads
● Limited Scalability
● Classes in file system
● Resolve classes with “Classpath”
● JIT
● Preemptive multi-threading
● Limited Robustness (process failure)
Database resident JVM● Database Session Model
● Session Isolation● Unlimited Scalability● Classes in database
● Resolve classes with “Resolver Spec”
● JIT (11g and up)
● Non-Preemptive multi-threading
● Does not crash as a whole
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Oracle’s Commitment to OJVM
● Used by a growing number of database customers acording to Oracle
● Used by Oracle Components
– InterMedia– Spatial– Text– XQuery (XMLDB)– WareHouse Builder– CDC (Change Data Capture)– ODM (Oracle Data Mining analytics functions)
● 12c Enhancements
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● Many among Fortune 500 companies● Some examples from
“Java in the Oracle Database @ Work – Customer Case Studies”
● And for sure Scotas & Cima
Who is Using OJVM
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Java in the Database: What For
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● Trigger-based Notification System using RMI
● Secure Credit-Card Processing using JSSE● Custom Alert applications that monitor
business data● Sending emails with attachment from
within the database● Produce PDF files from Result Set● Execute external OS commands and
external procedures● Implement Md5 CRC● Publish Repository Content to Portal● Portable Logistic Applications
● Implement Parsers for various File Formats (txt, zip, xml, binary)
● Implement Image Transformation and Format Conversion (GIF, PNG, JPEG, etc)
● Implement Database-resident Content Management System
● HTTP Call-Out● JDBC Call-Out● RMI Call-Out to SAP● Web Services Call-Out● Messaging across Tiers● RESTful Database Web Services● Near Real Time Full Text Search
Multitenant resources
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● Process– CPU– Memory
● Filesystem● Network
Process - CPU resources
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● Estimate CPU usage by OJVM– Process connected using shared servers– Process connected using dedicted servers– Jobs process– AQ process implemented in Java
● DBMS Resource Manager– CPU Caging
● Dedicated plan for each PDBs–Shares–% CPU–% Parallel Servers
● Dedicated plan for Jobs process
Process - Memory resources
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● Estimate memory usage by OJVM– SGA/UGA used by dedicated or shared server
process– Jobs process count as dedicated process– Look for global parameters:
● memory_target● memory_max_target● shared_pool_size (8Kb x load class)● java_pool_size (during executing)● java_soft_sessionspace_limit (soft limit, warning msg)● java_max_sessionspace_limit (hard limit, default 4Gb)
● Fine tunning using JMX monitoring
Filesystem resources
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● Logging– $ORACLE_HOME/javavm/lib/logging.properties
● Accesing to files– dbms_java.grant_permission
● Properties files– $ORACLE_HOME/javavm/lib/management/jmxremote.access– $ORACLE_HOME/javavm/lib/management/management.properties
● Trace files (Diag. directory)– alert_orcl.log– orcl_jnnn.trc
● Tablespaces/Datafiles● JDK version per CDB 1.6/1.7● IO metrics (Max. IOPS)
– dbms_resource_manager.calibrate_io
Network resources
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● ACLs– DBMS_NETWORK_ACL_ADMIN
● Protocol handlers (XMLDB)– dbms_xdb.setFtpPort
– dbms_xdb.setHttpPort
● Security– dbms_java.grant_permission
Network resources
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● ACLs– DBMS_NETWORK_ACL_ADMIN
● Protocol handlers (XMLDB)– dbms_xdb.setFtpPort
– dbms_xdb.setHttpPort
● Security– dbms_java.grant_permission
Deployments best practices
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● CDB/PDBs● Patching● Application segmentation
Examples - Scotas OLS
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● An Embedded version of Solr Framework running inside Oracle JVM● 42 new Java Classes and several new PLSQL Object Types● Four new SQL operators scontains(), sscore(), smlt(), shighlight() and poweful text analysis functionalities
● An orthogonal/up-to-date Solr solution for any programming language, especially Java, Ruby, Python, PHP and .Net, currently latest production version – 4.0.0.
● Available to any Oracle product such as BI, Apex, ODM
CREATE INDEX SIDX_A ON TEST_SOURCE_BIG(TEXT) INDEXTYPE IS LUCENE.SOLRINDEX parameters('DefaultColumn:text_tn;BatchCount:5000;CommitOnSync:false;LockMasterTable:false;IncludeMasterColumn:false;Updater:localhost@9099;Searcher:localhost@9099;SyncMode:OnLine;LogLevel:WARNING;ExtraCols:text "text_tn",line "line_tin", type "type_sn",substr(text,1,256) "title";HighlightColumn:title;MltColumn:title;LobStorageParameters:STORAGE (BUFFER_POOL KEEP) CACHE READS FILESYSTEM_LIKE_LOGGING');
CREATE INDEX SIDX_A ON TEST_SOURCE_BIG(TEXT) INDEXTYPE IS LUCENE.SOLRINDEX parameters('DefaultColumn:text_tn;BatchCount:5000;CommitOnSync:false;LockMasterTable:false;IncludeMasterColumn:false;Updater:localhost@9099;Searcher:localhost@9099;SyncMode:OnLine;LogLevel:WARNING;ExtraCols:text "text_tn",line "line_tin", type "type_sn",substr(text,1,256) "title";HighlightColumn:title;MltColumn:title;LobStorageParameters:STORAGE (BUFFER_POOL KEEP) CACHE READS FILESYSTEM_LIKE_LOGGING');
Conclusions
● Multitenant is about isolating data● OS resources are shared
– Is very important take this into account
● Applications need to be re-tested again
● Data which refers to OS resources need to be updated when plug/unplug PDBs
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Answers!
www.scotas.com | info@scotas.com | +1 (650) 704-7915 | 440 North Wolfe Road, Sunnyvale, CA 94085
Thank You!
www.scotas.com | info@scotas.com | +1 (650) 704-7915 | 440 North Wolfe Road, Sunnyvale, CA 94085
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