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CHAPTER 19 IM PR OVING DA TA BAS E PERFORM ANC E: S QL QUE RY OPTIMIZA TION
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No-workload mode: By using the NOWORKLOAD keyword, you can collect certain system statistics that mostly pertain to general I/O characteristics of your system, such as I/O seek time (IOSEEKTIM) and I/O transfer speed (IOTFRSPEED). You should ideally run the GATHER_ SYSTEM_STATS procedure in no-workload mode right after you create a new database. The procedure takes only a few minutes to complete and is suitable for all types of workloads.
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If you collect both workload and no-workload statistics, the optimizer will use the workload statistics.
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Workload mode: To collect representative statistics such as CPU and I/O performance, you must collect system statistics during a specified interval that represents a typical workload for your instance. You can use the INTERVAL keyword to specify statistics collection for a certain interval of time. You can alternatively use the START and STOP keywords to collect system statistics for a certain length of time. Under both workload settings for the GATHERING_MODE parameter (INTERVAL, or START and STOP), the database collects the following statistics: MAXTHR, SLAVETHR, CPUSPEED, SREADTIM, MREADTIM, and MBRC. Here s what the various system statistics I mentioned stand for: IOTFRSPEED: I/O transfer speed (bytes per millisecond) IOSEEKTIM: Seek time + latency time + operating system overhead time (milliseconds) SREADTIM: Average time to (randomly) read a single block (milliseconds) MREADTIM: Average time to (sequentially) read an MBRC block at once (milliseconds) CPUSPEED: Average number of CPU cycles captured for the workload (statistics collected using the INTERVAL or START and STOP options) CPUSPEEDNW: Average number of CPU cycles captured for the no-workload mode (statistics collected using NOWORKLOAD option) MBR: Average multiblock read count for sequential read, in blocks MAXTHR: Maximum I/O system throughput (bytes/second) SLAVETHR: Average slave I/O throughput (bytes/second) Here s the structure of the GATHER_SYSTEM_STATS procedure: DBMS_STATS.GATHER_SYSTEM_STATS gathering_mode VARCHAR2 interval INTEGER stattab VARCHAR2 statid VARCHAR2 statown VARCHAR2 ( DEFAULT DEFAULT DEFAULT DEFAULT DEFAULT 'NOWORKLOAD', NULL, NULL, NULL, NULL);
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Here s an example that shows how to use the procedure to collect system statistics: SQL> EXECUTE dbms_stats.gather_system_stats('start'); PL/SQL procedure successfully completed. SQL> SQL> EXECUTE dbms_stats.gather_system_stats('stop'); PL/SQL procedure successfully completed. SQL> SQL> SELECT * FROM sys.aux_stats$;
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CHAPTER 19 IMPROV IN G DA TA BAS E PERFORMAN CE: SQL QUERY OPTIMIZA TION
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SNAME ------------SYSSTATS_INFO SYSSTATS_INFO SYSSTATS_INFO SYSSTATS_INFO SYSSTATS_MAIN SYSSTATS_MAIN SYSSTATS_MAIN SYSSTATS_MAIN SYSSTATS_MAIN SYSSTATS_MAIN SYSSTATS_MAIN SYSSTATS_MAIN SYSSTATS_MAIN
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PNAME PVAL1 ------------- ---------STATUS DSTART DSTOP FLAGS 1 CPUSPEEDNW 67.014 IOSEEKTIM 10.266 IOTFRSPEED 10052.575 SREADTIM 5.969 MREADTIM 5.711 CPUSPEED 141 MBRC 18 MAXTHR 17442816 SLAVETHR
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PVAL2 ---------------COMPLETED 04-25-2008 10:44 04-26-2008 10:17
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You can view system statistics by using the GET_SYSTEM_STATISTICS procedure of the DBMS_STATS
Collecting Statistics on Dictionary Objects
You should collect optimizer statistics on data dictionary tables to maximize performance. The two types of dictionary tables are fixed and real. You can t change or delete dynamic performance tables, which means they are fixed. Real dictionary tables belong to schemas such as sys and system.
Collecting Statistics for Fixed Objects
Oracle recommends that you gather statistics for dynamic performance tables (fixed objects) only once for every database workload, which is usually a week for most OLTP databases. You can collect fixed object statistics in a couple ways, as follows: You can use the DBMS_STATS_GATHER_DATABASE_STATS procedure and set the GATHER_ SYS argument to TRUE (the default is FALSE). You can use the GATHER_FIXED_OBJECTS_STATS procedure of the DBMS_STATS package, as shown here: SQL> SHO USER USER is "SYS" SQL> EXECUTE DBMS_STATS.GATHER_FIXED_OBJECTS_STATS;
Tip
Before you can analyze any dictionary objects or fixed objects, you need the SYSDBA or ANALYZE ANY DICTIONARY system privilege.
You can use the procedures from the DBMS_STATS package that enable table-level statistics collection to collect statistics for an individual fixed table.
CHAPTER 19 IM PR OVING DA TA BAS E PERFORM ANC E: S QL QUE RY OPTIMIZA TION
Collecting Statistics for Real Dictionary Tables
You can use the following methods to collect statistics for real dictionary tables: Set the GATHER_SYS argument of the DBMS_STATS.GATHER_DATABASE_STATS procedure to TRUE. You can also use the GATHER_SCHEMA_STATS ('SYS') option. Use the DBMS_STATS.GATHER_DICTIONARY_STATS procedure, as shown here: SQL> SHO user USER is "SYS" SQL> EXECUTE dbms_stats.gather_dictionary_stats; The GATHER_DICTIONARY_STATS procedure helps you collect statistics for tables owned by the SYS and SYSTEM users as well as the owners of all database components.
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