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Howto exportandimportstatisti
 

Howto exportandimportstatisti

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    Howto exportandimportstatisti Howto exportandimportstatisti Presentation Transcript

    • How to Export and Import Statistics Alejandro Vargas Oracle IsraelCase DefinitionA critical application suddenly seems to hang, wait events show long table scans running on the OLTP environment. It comes outthat the DBA in charge of this system did run statistics on the tables of the user that owns the application. The gather statistics gotstuck and the process was killed. Since this moment the application started to perform extremely slowly.The production database has several clones; we decide to export back statistics from one of these clones, to the productiondatabase.Steps in Brief 1) Create a table to hold statistics on the source database 2) Generate a script that export table statistics on the clone database 3) Generate a script that import statistics on the clone database 4) Export statistics on clone database 5) Export table containing the exported statistics from clone database 6) Ftp export file with clone statistics table, and the script to import statistics from clone server to production server 7) Import table containing clone statistics into production database 8) Import statistics on production server using the script to import statisctics generated on the clone server
    • 1. Create tables to hold statistics on the clone database -- On Clone Database SQL> execute DBMS_STATS.create_stat_table(INV,OLD_STATS); PL/SQL procedure successfully completed. SQL> grant SELECT,INSERT,UPDATE,DELETE on INV.OLD_STATS to public; Grant succeeded.2. Generate a script that export table statistics on the clone database The purpose of this script is to generate one export statistics command per table, the export is directed into the table created on step 1. Variables: &tabname = the table created on the previous step to hold the statistics &usrname = The name of the owner of &tabname ---- script to generate export table stats start here ---------- set linesize 130 pagesize 0 spool expstat.sql select exec dbms_stats.export_table_stats(||chr(39)||owner||chr(39)||,||chr(39)||table_name||chr(39)||,null,||chr(39)||&tabname ||chr(39)||,null,true,||chr(39)||INV||chr(39)||) from dba_tables where owner =&usrname
    • / spool off ---- script to generate export table stats end here ---------- Note: you may also use instead of the script this command: exec DBMS_STATS.export_schema_stats(&usrname,&tabname) This syntax will run in 10g. It may fail on 8i – 9i databases with some objects. That’s why I prefer the script on these versions.3. Generate a script that import statistics on the clone database The purpose of this script is to generate one import statistics command per table, the source is the table created on step 1. &tabname = the table created on the previous step to hold the statistics &usrname = The name of the owner of &tabname ---- script to generate import table stats start here ---------- set linesize 130 pagesize 0 spool impstats.sql select exec dbms_stats.import_table_stats(||chr(39)||owner||chr(39)||,||chr(39)||table_name||chr(39)||,null,||chr( 39)||&tabname||chr(39)||,null,true,||chr(39)||&usrname||chr(39)||) from dba_tables where owner =&usrname / spool off
    • ---- script to generate import table stats end here ---------- Execute this script to generate impstats.sql that will import the statistics on the production database.4. Export statistics on clone database Using the script expstat.sql; generated on step 2, export statistics into the statistics table created on step 1.5. Export table containing the exported statistics from clone database vmractest:/oradisk/av/expstats>exp avargas file=exp_stats_from_clone tables=avr.old_stats feedback=1000 Export: Release 9.2.0.5.0 - Production on Tue Feb 20 11:57:02 2007 Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved. Password: Connected to: Oracle9i Enterprise Edition Release 9.2.0.5.0 - Production With the Partitioning, OLAP and Oracle Data Mining options JServer Release 9.2.0.5.0 - Production Export done in IW8ISO8859P8 character set and AL16UTF16 NCHAR character set About to export specified tables via Conventional Path ... Current user changed to AVR . . exporting table OLD_STATS ....
    • 4115 rows exported Export terminated successfully without warnings.6. Ftp export file with clone statistics table from clone server to production server and script to import statistics from clone server to production server Execute FTP session from target server, get both the table that contains the exported statistics and the script to import them, generated on step : proddb > ftp vmractest Connected to vmractest 220 vmractest FTP server (SunOS 5.8) ready. Name (vmractest:oracle): oracle 331 Password required for oracle. Password: 230 User oracle logged in. ftp> cd /oradisk/av/expstats 250 CWD command successful. ftp> get exp_stats_from_clone.dmp 200 PORT command successful. 150 ASCII data connection for exp_stats_from_clone.dmp (10.5.180.72,64082) (473088 bytes). 226 ASCII Transfer complete. local: exp_stats_from_clone.dmp remote: exp_stats_from_clone.dmp 478390 bytes received in 0.17 seconds (2680.69 Kbytes/s) ftp> get impstats.sql 200 PORT command successful. 150 ASCII data connection for impstats.sql (10.5.180.72,64776) (31461 bytes). 226 ASCII Transfer complete. local: impstats.sql remote: impstats.sql
    • 31704 bytes received in 0.033 seconds (947.63 Kbytes/s) ftp> bye 221 Goodbye.7. Import table containing clone statistics into production database On the production database import the table that contains the exported statistics. proddb >imp avargas file= exp_stats_from_clone.dmp full =y Import: Release 9.2.0.5.0 - Production on Tue Feb 20 12:19:11 2007 Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved. Password: Connected to: Oracle9i Enterprise Edition Release 9.2.0.5.0 - Production With the Partitioning, OLAP and Oracle Data Mining options JServer Release 9.2.0.5.0 - Production Export file created by EXPORT:V09.02.00 via conventional path import done in UTF8 character set and UTF8 NCHAR character set export client uses IW8ISO8859P8 character set (possible charset conversion) export server uses AL16UTF16 NCHAR character set (possible ncharset conversion) . importing AVARGASs objects into AVARGAS . importing AVRs objects into AVR . . importing table "OLD_STATS" 4115 rows imported Import terminated successfully without warnings.
    • 8. Import statistics on production server using the script to import statistics generated onthe clone server Using the script impstats.sql; generated on step 3, import statistics into the production database.End of the Procedure