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POSqlite Query Optimization (select * from where in AND not in order by limit offset)
 

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  1. POSqlite Query Optimization (select * from where in AND not in order by limit offset)
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    <p>Any ideas for optimizing the following query using Sqlite3?</p> <pre><code>SELECT * FROM Feed WHERE ActivityType IN ('PhotoActivity','CommentActivity') AND UserKey NOT IN ('testUser', 'testUser2') ORDER BY TimeStamp DESC LIMIT 20 OFFSET 0; </code></pre> <p>The table will never have over 100,000 records and we expect 100 to 1 reads to writes.</p> <p>Any help is greatly appreciated.</p> <p>Table Sql is:</p> <pre><code>CREATE TABLE Feed ( FeedActivityKey TEXT PRIMARY KEY, UserKey TEXT, AssemblyQualifiedName TEXT, SerializedObject BLOB, ActivityType TEXT, CorrelatedKey TEXT, TimeStamp INTEGER); CREATE INDEX Feed_ActivityTypeUserKey ON [FriendFeed] ( [ActivityType], [UserKey] DESC); CREATE INDEX Feed_UserKey ON [FriendFeed] ( [UserKey] DESC); CREATE INDEX Feed_TimeStamp ON [FriendFeed] ( [TimeStamp] DESC); </code></pre> <p>Explain Output is:</p> <p> 0 Trace 0 0 0 0 </p> <p> 1 OpenEphemeral 1 3 0 keyinfo(1,-BINARY) 0 </p> <p> 2 Integer 20 1 0 0 </p> <p> 3 MustBeInt 1 0 0 0 </p> <p> 4 IfZero 1 73 0 0 </p> <p> 5 Integer 0 2 0 0 </p> <p> 6 MustBeInt 2 0 0 0 </p> <p> 7 IfPos 2 9 0 0 </p> <p> 8 Integer 0 2 0 0 </p> <p> 9 Add 1 2 3 0 </p> <p> 10 IfPos 1 12 0 0 </p> <p> 11 Integer -1 3 0 0 </p> <p> 12 String8 0 4 0 PhotoActivity 0 </p> <p> 13 String8 0 5 0 CommentActivity 0 </p> <p> 14 Goto 0 74 0 0 </p> <p> 15 OpenRead 0 2 0 7 0 </p> <p> 16 OpenRead 2 4 0 keyinfo(2,BINARY,BINARY) 0 </p> <p> 17 If 7 25 0 0 </p> <p> 18 Integer 1 7 0 0 </p> <p> 19 OpenEphemeral 4 1 0 keyinfo(1,BINARY) 0 </p> <p> 20 Null 0 9 0 0 </p> <p> 21 MakeRecord 4 1 9 a 0 </p> <p> 22 IdxInsert 4 9 0 0 </p> <p> 23 MakeRecord 5 1 9 a 0 </p> <p> 24 IdxInsert 4 9 0 0 </p> <p> 25 Rewind 4 53 0 0 </p> <p> 26 Column 4 0 6 0 </p> <p> 27 IsNull 6 52 0 0 </p> <p> 28 Affinity 6 1 0 aab 0 </p> <p> 29 SeekGe 2 52 6 1 0 </p> <p> 30 IdxGE 2 52 6 1 1 </p> <p> 31 IdxRowid 2 9 0 0 </p> <p> 32 Seek 0 9 0 0 </p> <p> 33 Column 0 0 10 0 </p> <p> 34 Column 2 1 11 0 </p> <p> 35 Column 0 2 12 0 </p> <p> 36 Column 0 3 13 0 </p> <p> 37 Column 2 0 14 0 </p> <p> 38 Column 0 5 15 0 </p> <p> 39 Column 0 6 16 0 </p> <p> 40 MakeRecord 10 7 9 0 </p> <p> 41 Column 0 6 17 0 </p> <p> 42 Sequence 1 18 0 0 </p> <p> 43 Move 9 19 1 0 </p> <p> 44 MakeRecord 17 3 8 0 </p> <p> 45 IdxInsert 1 8 0 0 </p> <p> 46 IfZero 3 49 0 0 </p> <p> 47 AddImm 3 -1 0 0 </p> <p> 48 Goto 0 51 0 0 </p> <p> 49 Last 1 0 0 0 </p> <p> 50 Delete 1 0 0 0 </p> <p> 51 Next 2 30 0 0 </p> <p> 52 Next 4 26 0 0 </p> <p> 53 Close 0 0 0 0 </p> <p> 54 Close 2 0 0 0 </p> <p> 55 OpenPseudo 5 1 7 0 </p> <p> 56 Sort 1 72 0 0 </p> <p> 57 AddImm 2 -1 0 0 </p> <p> 58 IfNeg 2 60 0 0 </p> <p> 59 Goto 0 71 0 0 </p> <p> 60 Column 1 2 9 0 </p> <p> 61 Integer 1 8 0 0 </p> <p> 62 Insert 5 9 8 0 </p> <p> 63 Column 5 0 10 0 </p> <p> 64 Column 5 1 11 0 </p> <p> 65 Column 5 2 12 0 </p> <p> 66 Column 5 3 13 0 </p> <p> 67 Column 5 4 14 0 </p> <p> 68 Column 5 5 15 0 </p> <p> 69 Column 5 6 16 0 </p> <p> 70 ResultRow 10 7 0 0 </p> <p> 71 Next 1 57 0 0 </p> <p> 72 Close 5 0 0 0 </p> <p> 73 Halt 0 0 0 0 </p> <p> 74 Transaction 0 0 0 0 </p> <p> 75 VerifyCookie 0 5 0 0 </p> <p> 76 TableLock 0 2 0 FriendFeed 0 </p> <p> 77 Goto 0 15 0 0 </p>
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. USLarry Lustig
    1. USAlex Spence
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POSqlite Query Optimization (select * from where in AND not in order by limit offset)
      1. This table or related slice is empty.
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      1. POSqlite Query Optimization (select * from where in AND not in order by limit offset)
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      1. POSqlite Query Optimization (select * from where in AND not in order by limit offset)
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI assume it's just a typo, but the DDL you gave creates a table called Feed but indexes a table called FriendFeed. If that's really the case, you're not indexing the table you're selecting against.
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      1. POSqlite Query Optimization (select * from where in AND not in order by limit offset)
      1. USLarry Lustig
    2. COYeah thats a typo
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      1. POSqlite Query Optimization (select * from where in AND not in order by limit offset)
      1. USAlex Spence
    3. COWhat is the cardinality of (ActivityType), (UserKey), and (ActivityType, UserKey)? Are they supported by reference tables in which you could possibly store integer IDs?
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      1. POSqlite Query Optimization (select * from where in AND not in order by limit offset)
      1. USLarry Lustig
 

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