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Server benchmarks on earlier Java Virtual Machines tend to show that server performance of Hot Spot was better, but that JRockit had a much better scalability.

Oracle Spatial and Graph, formerly Oracle Spatial, forms a separately-licensed option component of the Oracle Database.

The geospatial feature of Oracle Spatial and Graph provides a SQL schema and functions that facilitate the storage, retrieval, update, and query of collections of spatial features in an Oracle database.

(The spatial component of a spatial feature consists of the geometric representation of its shape in some coordinate space — referred to as its "geometry".) The Oracle Spatial geospatial data features consist of: The Network Data Model feature is a property graph model used to model and analyze physical and logical networks used in industries such as transportation, logistics, and utilities.

Its features include: The RDF Semantic Graph feature supports the World Wide Web Consortium (W3C) RDF standards.

It provides RDF data management, querying and inferencing that are commonly used in a variety of applications ranging from semantic data integration to social network analysis and linked open data applications.

With Oracle 8, Oracle Corporation marketing dubbed the spatial extension simply "Oracle Spatial".

that using JRockit can give significant performance gains.

The following is the execution plan that Oracle selected: ------------------------------------------------------------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | TQ |IN-OUT| PQ Distrib | ------------------------------------------------------------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | | | 6 (100)| | | | | | 1 | VIEW | USER_SCHEDULER_RUNNING_JOBS | 3 | 198 | 6 (34)| | | | | | 2 | UNION-ALL | | | | | | | | | | 3 | MERGE JOIN CARTESIAN | | 1 | 190 | 5 (20)| | | | | |* 4 | HASH JOIN OUTER | | 1 | 190 | 5 (20)| | | | | | 5 | NESTED LOOPS | | 1 | 171 | 4 (0)| | | | | | 6 | NESTED LOOPS | | 1 | 171 | 4 (0)| | | | | |* 7 | HASH JOIN OUTER | | 1 | 138 | 1 (0)| | | | | | 8 | NESTED LOOPS | | 1 | 99 | 1 (0)| | | | | | 9 | NESTED LOOPS | | 1 | 99 | 1 (0)| | | | | | 10 | MERGE JOIN CARTESIAN | | 1 | 73 | 0 (0)| | | | | |* 11 | FIXED TABLE FULL | X$KCCDI | 1 | 15 | 0 (0)| | | | | | 12 | BUFFER SORT | | 1 | 58 | 0 (0)| | | | | |* 13 | PX COORDINATOR | | | | | | | | | | 14 | PX SEND QC (RANDOM) | : TQ10000 | 1 | 26 | 0 (0)| | Q1,00 | P-S | QC (RAND) | |* 15 | VIEW | GV$SCHEDULER_RUNNING_JOBS | | | | | Q1,00 | PCWP | | |* 16 | FIXED TABLE FULL | X$JSKSLV | 1 | 26 | 0 (0)| | Q1,00 | PCWP | | |* 17 | INDEX UNIQUE SCAN | SCHEDULER$_JOB_PK | 1 | | 0 (0)| | | | | |* 18 | TABLE ACCESS BY INDEX ROWID | SCHEDULER$_JOB | 1 | 26 | 1 (0)| | | | | |* 19 | PX COORDINATOR | | | | | | | | | | 20 | PX SEND QC (RANDOM) | : TQ20000 | 1 | 28 | 0 (0)| | Q2,00 | P-S | QC (RAND) | |* 21 | VIEW | GV$SESSION | | | | | Q2,00 | PCWP | | | 22 | MERGE JOIN CARTESIAN | | 1 | 28 | 0 (0)| | Q2,00 | PCWP | | | 23 | NESTED LOOPS | | 1 | 12 | 0 (0)| | Q2,00 | PCWP | | |* 24 | FIXED TABLE FIXED INDEX | X$KSLWT (ind:1) | 1 | 8 | 0 (0)| | Q2,00 | PCWP | | |* 25 | FIXED TABLE FIXED INDEX | X$KSLED (ind:2) | 1 | 4 | 0 (0)| | Q2,00 | PCWP | | | 26 | BUFFER SORT | | 1 | 16 | 0 (0)| | Q2,00 | PCWP | | |* 27 | FIXED TABLE FIXED INDEX | X$KSUSE (ind:1) | 1 | 16 | 0 (0)| | Q2,00 | PCWP | | |* 28 | INDEX RANGE SCAN | I_OBJ1 | 1 | | 2 (0)| | | | | | 29 | TABLE ACCESS BY INDEX ROWID | OBJ$ | 1 | 33 | 3 (0)| | | | | | 30 | PX COORDINATOR | | | | | | | | | | 31 | PX SEND QC (RANDOM) | : TQ30000 | 173 | 2595 | 1 (100)| | Q3,00 | P-S | QC (RAND) | | 32 | VIEW | GV$PROCESS | | | | | Q3,00 | PCWP | | |* 33 | FIXED TABLE FULL | X$KSUPR | 173 | 2595 | 1 (100)| | Q3,00 | PCWP | | | 34 | BUFFER SORT | | 1 | | 5 (20)| | | | | | 35 | FIXED TABLE FULL | X$KCCDI2 | 1 | | 0 (0)| | | | | |* 36 | HASH JOIN OUTER | | 1 | 286 | 1 (100)| | | | | |* 37 | HASH JOIN OUTER | | 1 | 267 | 0 (0)| | | | | |* 38 | FILTER | | | | | | | | | |* 39 | HASH JOIN OUTER | | 1 | 228 | 0 (0)| | | | | | 40 | NESTED LOOPS | | 1 | 189 | 0 (0)| | | | | | 41 | NESTED LOOPS | | 1 | 189 | 0 (0)| | | | | | 42 | NESTED LOOPS | | 1 | 97 | 0 (0)| | | | | |* 43 | PX COORDINATOR | | | | | | | | | | 44 | PX SEND QC (RANDOM) | : TQ40000 | 1 | 26 | 0 (0)| | Q4,00 | P-S | QC (RAND) | |* 45 | VIEW | GV$SCHEDULER_RUNNING_JOBS | | | | | Q4,00 | PCWP | | |* 46 | FIXED TABLE FULL | X$JSKSLV | 1 | 26 | 0 (0)| | Q4,00 | PCWP | | | 47 | TABLE ACCESS BY INDEX ROWID| SCHEDULER$_LIGHTWEIGHT_JOB | 1 | 39 | 0 (0)| | | | | |* 48 | INDEX UNIQUE SCAN | SCHEDULER$_LWJOB_PK | 1 | | 0 (0)| | | | | |* 49 | INDEX RANGE SCAN | SCHEDULER$_LOBJ_UK | 1 | | 0 (0)| | | | | |* 50 | TABLE ACCESS BY INDEX ROWID | SCHEDULER$_LWJOB_OBJ | 1 | 92 | 0 (0)| | | | | |* 51 | PX COORDINATOR | | | | | | | | | | 52 | PX SEND QC (RANDOM) | : TQ50000 | 1 | 39 | | | Q5,00 | P-S | QC (RAND) | |* 53 | VIEW | GV$SCHEDULER_INMEM_RTINFO | | | | | Q5,00 | PCWP | | |* 54 | FIXED TABLE FULL | X$JSKMIMRT | 1 | 39 | | | Q5,00 | PCWP | | |* 55 | PX COORDINATOR | | | | | | | | | | 56 | PX SEND QC (RANDOM) | : TQ60000 | 1 | 28 | 0 (0)| | Q6,00 | P-S | QC (RAND) | |* 57 | VIEW | GV$SESSION | | | | | Q6,00 | PCWP | | | 58 | MERGE JOIN CARTESIAN | | 1 | 28 | 0 (0)| | Q6,00 | PCWP | | | 59 | NESTED LOOPS | | 1 | 12 | 0 (0)| | Q6,00 | PCWP | | |* 60 | FIXED TABLE FIXED INDEX | X$KSLWT (ind:1) | 1 | 8 | 0 (0)| | Q6,00 | PCWP | | |* 61 | FIXED TABLE FIXED INDEX | X$KSLED (ind:2) | 1 | 4 | 0 (0)| | Q6,00 | PCWP | | | 62 | BUFFER SORT | | 1 | 16 | 0 (0)| | Q6,00 | PCWP | | |* 63 | FIXED TABLE FIXED INDEX | X$KSUSE (ind:1) | 1 | 16 | 0 (0)| | Q6,00 | PCWP | | | 64 | PX COORDINATOR | | | | | | | | | | 65 | PX SEND QC (RANDOM) | : TQ70000 | 173 | 2595 | 1 (100)| | Q7,00 | P-S | QC (RAND) | | 66 | VIEW | GV$PROCESS | | | | | Q7,00 | PCWP | | |* 67 | FIXED TABLE FULL | X$KSUPR | 173 | 2595 | 1 (100)| | Q7,00 | PCWP | | |* 68 | HASH JOIN OUTER | | 1 | 202 | 1 (100)| | | | | | 69 | MERGE JOIN CARTESIAN | | 1 | 183 | 0 (0)| | | | | |* 70 | HASH JOIN OUTER | | 1 | 179 | 0 (0)| | | | | |* 71 | HASH JOIN | | 1 | 140 | 0 (0)| | | | | |* 72 | HASH JOIN | | 1 | 82 | 0 (0)| | | | | |* 73 | PX COORDINATOR | | | | | | | | | | 74 | PX SEND QC (RANDOM) | : TQ80000 | 1 | 69 | | | Q8,00 | P-S | QC (RAND) | |* 75 | VIEW | GV$SCHEDULER_INMEM_RTINFO | | | | | Q8,00 | PCWP | | |* 76 | FIXED TABLE FULL | X$JSKMIMRT | 1 | 69 | | | Q8,00 | PCWP | | | 77 | PX COORDINATOR | | | | | | | | | | 78 | PX SEND QC (RANDOM) | : TQ90000 | 1 | 13 | | | Q9,00 | P-S | QC (RAND) | | 79 | VIEW | GV$SCHEDULER_INMEM_MDINFO | | | | | Q9,00 | PCWP | | | 80 | FIXED TABLE FULL | X$JSKMIMMD | 1 | 13 | | | Q9,00 | PCWP | | |* 81 | PX COORDINATOR | | | | | | | | | | 82 | PX SEND QC (RANDOM) | : TQ100000 | 1 | 26 | 0 (0)| | 10,00 | P-S | QC (RAND) | |* 83 | VIEW | GV$SCHEDULER_RUNNING_JOBS | | | | | 10,00 | PCWP | | |* 84 | FIXED TABLE FULL | X$JSKSLV | 1 | 26 | 0 (0)| | 10,00 | PCWP | | |* 85 | PX COORDINATOR | | | | | | | | | | 86 | PX SEND QC (RANDOM) | : TQ110000 | 1 | 28 | 0 (0)| | 11,00 | P-S | QC (RAND) | |* 87 | VIEW | GV$SESSION | | | | | 11,00 | PCWP | | | 88 | MERGE JOIN CARTESIAN | | 1 | 28 | 0 (0)| | 11,00 | PCWP | | | 89 | NESTED LOOPS | | 1 | 12 | 0 (0)| | 11,00 | PCWP | | |* 90 | FIXED TABLE FIXED INDEX | X$KSLWT (ind:1) | 1 | 8 | 0 (0)| | 11,00 | PCWP | | |* 91 | FIXED TABLE FIXED INDEX | X$KSLED (ind:2) | 1 | 4 | 0 (0)| | 11,00 | PCWP | | | 92 | BUFFER SORT | | 1 | 16 | 0 (0)| | 11,00 | PCWP | | |* 93 | FIXED TABLE FIXED INDEX | X$KSUSE (ind:1) | 1 | 16 | 0 (0)| | 11,00 | PCWP | | | 94 | BUFFER SORT | | 1 | 4 | 0 (0)| | | | | | 95 | TABLE ACCESS CLUSTER | USER$ | 1 | 4 | 0 (0)| | | | | |* 96 | INDEX UNIQUE SCAN | I_USER# | 1 | | 0 (0)| | | | | | 97 | PX COORDINATOR | | | | | | | | | | 98 | PX SEND QC (RANDOM) | : TQ120000 | 173 | 2595 | 1 (100)| | 12,00 | P-S | QC (RAND) | | 99 | VIEW | GV$PROCESS | | | | | 12,00 | PCWP | | |*100 | FIXED TABLE FULL | X$KSUPR | 173 | 2595 | 1 (100)| | 12,00 | PCWP | | ------------------------------------------------------------------------------------------------------------------------------------------------- Yep, to top it all off, that’s a parallel query execution too.

The ugly part occurred when this query got deployed and the queue-based processing that contained the modified code went from processing 500 messages per second down to just 2. Thankfully the problem was trivial to diagnose and easily fixed so no damage was done.

A joint development team of CHS and Oracle personnel subsequently redesigned the Oracle kernel, resulting in the "Spatial Data Option" or "SDO" for Oracle 7.

(The SDO_ prefix continues in use within Oracle Spatial implementations.) The spatial indexing system for SDO involved an adaptation of Riemannian hypercube data-structures, invoking a helical spiral through 3-dimensional space, which allows n-size of features.

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