Gather table stats in oracle

Author: velll

oracle/table_stats.sql

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+-- Basic command
+BEGIN
+  DBMS_STATS.GATHER_TABLE_STATS(
+    OWNNAME          => :schema,
+    TABNAME          => :table,
+    DEGREE           => DBMS_STATS.AUTO_DEGREE,    -- degree of parallelism
+    CASCADE          => TRUE,                      -- indexes too
+    ESTIMATE_PERCENT => 10,                        -- sample percentage
+    NO_INVALIDATE    => FALSE,                     -- invalidate cursors immediately
+    METHOD_OPT       => 'FOR ALL COLUMNS SIZE 1'); -- no histograms
+END;
+
+-- How to construct method_opt?
+
+-- All including hidden
+'FOR ALL COLUMNS'
+
+-- Specified columns
+'FOR COLUMNS COL1, COL2, ...'
+
+-- No histogram
+'SIZE 1'
+
+-- A histogram with 10 buckets
+'SIZE 10'
+
+-- Can use several combined
+'FOR COLUMNS COL1 SIZE 1 FOR COLUMNS COL2 SIZE 10'
+
+-- Clear stats for table
+exec DBMS_STATS.DELETE_TABLE_STATS(ownname => :schema, tabname => :table);